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tms320 second-generation digital signal processors sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 1 advance information concerns new products in the sampling or preproduction phase of development. characteristic data and other specifications are subject to change without notice. copyright ? 1991, texas instruments incorporated ? 80-ns instruction cycle time ? 544 words of on-chip data ram ? 4k words of on-chip secure program eprom (tms320e25) ? 4k words of on-chip program rom (tms320c25) ? 128k words of data/program space ? 32-bit alu/accumulator ? 16 16-bit multiplier with a 32-bit product ? block moves for data/program management ? repeat instructions for efficient use of program space ? serial port for direct codec interface ? synchronization input for synchronous multiprocessor configurations ? wait states for communication to slow off-chip memories/peripherals ? on-chip timer for control operations ? single 5-v supply ? packaging: 68-pin pga, plcc, and cer-quad ? 68-to-28 pin conversion adapter socket for eprom programming ? commercial and military versions available ? nmos technology: e tms32020 200-ns cycle time . . . . . . . . . ? cmos technology: e tms320c25 100-ns cycle time . . . . . . . . e tms320e25 100-ns cycle time . . . . . . . . e tms320c25-50 80-ns cycle time . . . . . . description this data sheet provides complete design documentation for the second-generation devices of the tms320 family. this facilitates the selection of the devices best suited for user applications by providing all specifications and special features for each tms320 member. this data sheet is divided into four major sections: architecture, electrical specifications (nmos and cmos), timing diagrams, and mechanical data. in each of these sections, generic information is presented first, followed by specific device information. an index is provided for quick reference to specific information about a device. 1234567891011 a b c d e f g h j k l 68-pin gb package 2 (top view) iack msc clkout1 clkout2 xf holda dx fsx x2 clkin x1 br d8 d9 d10 d11 d12 d13 d14 d15 ready clkr clkx strb r/w ps is ds v ss 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 9 8 7 6 5 4 3 2 1 6867666564636261 v ss d7 d6 d5 d4 d3 d2 d1 d0 sync int0 int1 int2 v cc dr fsr a0 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 a1 a2 a3 a4 a5 a6 a7 a8 a9 a10 a11 a12 a13 a14 a15 v ss v cc v cc v cc 68-pin fn and fz packages 2 (top view) advance information
tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 2 pga and plcc/cer-quad pin assignments function pin function pin function pin function pin function pin function pin a0 k1/26 a12 k8/40 d2 e1/16 d14 a5/3 int2 h1/22 v cc h2/23 a1 k2/28 a13 l9/41 d3 d2/15 d15 b6/2 is j11/46 v cc l6/35 a2 l3/29 a14 k9/42 d4 d1/14 dr j1/24 mp/mc 2 a6/1 v ss b1/10 a3 k3/30 a15 l10/43 d5 c2/13 ds k10/45 msc c10/59 v ss k11/44 a4 l4/31 bio b7/68 d6 c1/12 dx e11/54 ps j10/47 v ss l2/27 a5 k4/32 br g11/50 d7 b2/11 fsr j2/25 ready b8/66 xf d11/56 a6 l5/33 clkout1 c11/58 d8 a2/9 fsx f10/53 rs a8/65 x1 g10/51 a7 k5/34 clkout2 d10/57 d9 b3/8 hold a7/67 r/w h11/48 x2/clkin f11/52 a8 k6/36 clkr b9/64 d10 a3/7 holda e10/55 strb h10/49 a9 l7/37 clkx a9/63 d11 b4/6 iack b11/60 sync f2/19 a10 k7/38 d0 f1/18 d12 a4/5 int0 g1/20 v cc a10/61 a11 l8/39 d1 e2/17 d13 b5/4 int1 g2/21 v cc b10/62 2 on the tms32020, mp/mc must be connected to v cc . signals i/o/z 3 definition v cc v ss x1 x2/clkin clkout1 clkout2 d15-d0 a15-a0 ps , ds , is r/w strb rs int2 -int0 mp/mc msc iack ready br xf hold holda sync bio dr clkr fsr dx clkx fsx i i o i o o i/o/z o/z o/z o/z o/z i i i o o i o o i o i i i i i o/z i i/o/z 5-v supply pins ground pins output from internal oscillator for crystal input to internal oscillator from crystal or external clock master clock output (crystal or clkin frequency/4) a second clock output signal 16-bit data bus d15 (msb) through d0 (lsb). multiplexed between program, data, and i/o spaces. 16-bit address bus a15 (msb) through a0 (lsb) program, data, and i/o space select signals read/write signal strobe signal reset input external user interrupt inputs microprocessor/microcomputer mode select pin microstate complete signal interrupt acknowledge signal data ready input. asserted by external logic when using slower devices to indicate that the current bus transaction is complete. bus request signal. asserted when the tms320c2x requires access to an external global data memory space. external flag output (latched software-programmable signal) hold input. when asserted, tms320c2x goes into an idle mode and places the data, address, and control lines in the high impedance state. hold acknowledge signal synchronization input branch control input. polled by bioz instruction. serial data receive input clock for receive input for serial port frame synchronization pulse for receive input serial data transmit output clock for transmit output for serial port frame synchronization pulse for transmit. configuration as either an input or an output. 3 i/o/z denotes input/output/high-impedance state.
tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 3 description the tms320 family of 16/32-bit single-chip digital signal processors combines the flexibility of a high-speed controller with the numerical capability of an array processor, thereby offering an inexpensive alternative to multichip bit-slice processors. the highly paralleled architecture and efficient instruction set provide speed and flexibility to produce a mos microprocessor family that is capable of executing more than 12.5 mips (million instructions per section). the tms320 family optimizes speed by implementing functions in hardware that other processors implement through microcode or software. this hardware-intensive approach provides the design engineer with processing power previously unavailable on a single chip. the tms320 family consists of three generations of digital signal processors. the first generation contains the tms32010 and its spinoffs. the second generation includes the tms32020, tms320c25, and tms320e25, which are described in this data sheet. the tms320c30 is a floating-point dsp device designed for even higher performance. many features are common among the tms320 processors. specific features are added in each processor to provide different cost/performance tradeoffs. software compatibility is maintained throughout the family to protect the user's investment in architecture. each processor has software and hardware tools to facilitate rapid design. introduction the tms32010, the first nmos digital signal processor in the tms320 family, was introduced in 1983. its powerful instruction set, inherent flexibility, high-speed number-crunching capabilities, and innovative architecture have made this high-performance, cost-effective processor the ideal solution to many telecommunications, computer, commercial, industrial, and military applications. since that time, the tms320c10, a low-power cmos version of the industry-standard tms32010, and other spinoff devices have been added to the first generation of the tms320 family. the second generation of the tms320 family (referred to as tms320c2x) includes four members, the tms32020, tms320c25, tms320c25-50, and tms320e25. the architecture of these devices is based upon that of the tms32010. the tms32020 , processed in nmos technology, is source-code compatible with he tms32010 and in many applications is capable of two times the throughput of the first-generation devices. its enhanced instruction set (109 instructions), large on-chip data memory (544 words), large memory spaces, on-chip serial port, and hardware timer make the tms32020 a powerful addition to the tms320 family. the tms320c25 is the second member of the tms320 second generation. it is processed in cmos technology, is capable of an instruction cycle time of 100 ns, and is pin-for-pin and object-code compatible with the tms32020. the tms320c25's enhanced feature set greatly increases the functionality of the device over the tms32020. enhancements included 24 additional instructions (133 total), eight auxiliary registers, an eight-level hardware stack, 4k words of on-chip program rom, a bit-reversed indexed-addressing mode, and the low-power dissipation inherent to the cmos process. an extended-temperature range version (tms320c25gba) is also available. the tms320c25-50 is a high-speed version of the tms320c25. it is capable of an instruction cycle time of less than 80 ns. it is architecturally identical to the original 40-mhz version of the tms320c25 and, thus, is pin-for-pin and object-code compatible with the tms320c25. the tms320e25 is identical to the tms320c25, with the exception that the on-chip 4k-word program rom is replaced with a 4k-word on-chip program eprom. on-chip eprom allows realtime code development and modification for immediate evaluation of system performance.
tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 4 key features: tms32020 ? 200-ns instruction cycle time ? 544 words of on-chip data ram ? 128k words of total data/program memory space ? wait states for communication to slower off-chip memories ? source code compatible with the tms320c1x ? single-cycle multiply/accumulate instructions ? repeat instructions ? global data memory interface ? block moves for data/program management ? five auxiliary registers with dedicated arithmetic unit ? serial port for multiprocessing or interfacing to codecs, serial analog-to-digital converters, etc. key features: tms320c25, tms320c25-50, tms320e25 ? 80-ns instruction cycle time (tms320c25-50) ? 100-ns instruction cycle time (tms320c25) ? 4k words of on-chip secure program eprom (tms320e25) ? 4k words of on-chip program rom (tms320c25) ? 544 words of on-chip ram ? 128k words of total program/data memory space ? wait states for communications to slower off-chip memories ? object-code compatible with the tms32020 ? source-code compatible with tms320c1x ? 24 additional instructions to support adaptive filtering, ffts, and extended-precision arithmetic ? block moves for data/program management ? single-cycle multiply/accumulate instructions ? eight auxiliary registers with dedicated arithmetic unit ? bit-reversed indexed-addressing mode for radix-2 ffts ? double-buffered serial port ? on-chip clock generator ? single 5-v supply ? nmos technology ? 68-pin grid array (pga) package ? on-chip clock generator ? single 5-v supply ? internal security mechanism (tms320e25) ? 68-to-28 pin conversion adapter socket ? cmos technology ? 68-pin grid array (pga) package (tms320c25) ? 68-lead plastic leaded chip carrier (plcc) package (tms320c25, tms320c25-50) ? 68-lead cer-quad package (tms320e25) multiplier 32-bit alu/acc shifters timer interrupts data (16) address (16) +5 v gnd 32-bit alu/acc shifters timer mp/mc data (16) address (16) +5 v gnd 4k-words rom/eprom multiplier 256-word data/prog ram 288-word data ram interrupts serial interface multi- processor interface serial interface multi- processor interface 256-word data/prog ram 288-word data ram
device ram rom/eprom prog data timer cycle time (ns) typ power (mw) package type i/o 2 tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 5 table 1 provides an overview of the second-generation tms320 processors with comparisons of memory, i/o, cycle timing, power, package type, technology, and military support. for specific availability, contact the nearest ti field sales office. table 1. tms320 second-generation device overview memory on-chip off-chip ser par dma pga plcc cer-quad tms32020 3 (nmos) 544 e 64k 64k yes 16 16 yes yes 200 1250 68 e e tms320c25 3 (cmos) 544 4k 64k 64k yes 16 16 con yes 100 500 68 68 e tms320c25-50 (cmos) 544 4k 64k 64k yes 16 16 con yes 80 500 e 68 e tms320e25 (cmos) 544 4k 64k 64k yes 16 16 con yes 100 500 e e 68 2 ser = serial; par = parallel; dma = direct memory access; con = concurrent dma. 3 military version available; contact nearest ti field sales office for availability. military version planned; contact nearest ti field sales office for details. architecture the tms320 family utilizes a modified harvard architecture for speed and flexibility. in a strict harvard architecture, program and data memory lie in two separate spaces, permitting a full overlap of instruction fetch and execution. the tms320 family's modification of the harvard architecture allows transfers between program and data spaces, thereby increasing the flexibility of the device. this modification permits coefficients stored in program memory to be read into the ram, eliminating the need for a separate coefficient rom. it also makes available immediate instructions and subroutines based on computed values. increased throughput on the tms320c2x devices for many dsp applications is accomplished by means of single-cycle multiply/accumulate instructions with a data move option, up to eight auxiliary registers with a dedicated arithmetic unit, and faster i/o necessary for data-intensive signal processing. the architectural design of the tms320c2x emphasizes overall speed, communication, and flexibility in processor configuration. control signals and instructions provide floating-point support, block-memory transfers, communication to slower off-chip devices, and multiprocessing implementations. 32-bit alu/accumulator the 32-bit arithmetic logic unit (alu) and accumulator perform a wide range of arithmetic and logical instructions, the majority of which execute in a single clock cycle. the alu executes a variety of branch instructions dependent on the status of the alu or a single bit in a word. these instructions provide the following capabilities: ? branch to an address specified by the accumulator ? normalize fixed-point numbers contained in the accumulator ? test a specified bit of a word in data memory one input to the alu is always provided from the accumulator, and the other input may be provided from the product register (pr) of the multiplier or the input scaling shifter which has fetched data from the ram on the data bus. after the alu has performed the arithmetic or logical operations, the result is stored in the accumulator. the 32-bit accumulator is split into two 16-bit segments for storage in data memory. additional shifters at the output of the accumulator perform shifts while the data is being transferred to the data bus for storage. the contents of the accumulator remain unchanged.
tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 6 functional block diagram (tms320c2x) data bus data bus 16 16 16 16 16 16 shifters (0-7) 2 accl(16) 32 acch(16) 32 32 alu(32) 32 32 32 shifter(-6, 0, 1, 4) 16 shifter(0-16) 7 lsb from ir 9 9 16 16 16 32 tr(16) 16 multiplier pr(32) data/prog ram (256 16) block b0 16 16 16 16 16 data ram block b1 (256 16) block b2 (32 16) 3 arb(3) 3 3 3 arp(3) arau(16) ar4(16) ar3(16) ar2(16) ar1(16) 16 ar0(16) dp(9) 16 fsx clkx dx fsr clkr drr(16) dxr(16) prd(16) tim(16) imr(6) greg(8) 16 16 ifr(6) rptc(8) sto(16) st1(16) ir(16) 3 16 16 16 16 16 d15-d0 16 16 16 16 a15-a0 int (2-0) mp/mc instruction (8 x 16) 16 16 16 16 16 16 16 16 16 stack pc(16) 16 iack rs bio msc holda hold xf br strb r/w program bus program bus program rom/ eprom (4096 16) qir(16) 16 16 16 6 8 16 16 16 x1 x2/clkin clkout1 clkout2 controller 16 pfc(16) mcs(16) ps ds is sync mux mux mux mux mux mux mux dr mux mux c ready address ar5(16) ar6(16) ar7(16) rsr(16) xsr(16) legend: acch = accumulator high ifr = interrupt flag register pc = program counter accl = accumulator low imr = interrupt mask register pfc = prefetch counter alu = arithmetic logic unit ir = instruction register rptc = repeat instruction counter arau = auxiliary register arithmetic unitmcs = microcall stack greg = global memory allocation register arb = auxiliary register pointer buffer qir = queue instruction register rsr = serial port receive shift register arp = auxiliary register pointer pr = product register xsr = serial port transmit shift register dp = data memory page pointer prd = period register for timer ar0-ar7 = auxiliary registers drr = serial port data receive registertim = timer st0, st1 = status registers dxr = serial port data transmit register tr = temporary register c = carry bit
tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 7 scaling shifter the tms320c2x scaling shifter has 16-bit input connected to the data bus and a 32-bit output connected to the alu. the scaling shifter produces a left shift of 0 to 16 bits on the input data, as programmed in the instruction. the lsbs of the output are filled with zeroes, and the msbs may be either filled with zeroes or sign-extended, depending upon the status programmed into the sxm (sign-extension mode) bit of status register st1. 16 16-bit parallel multiplier the 16 16-bit hardware multiplier is capable of computing a signed or unsigned 32-bit product in a single machine cycle. the multiplier has the following two associated registers. ? a 16-bit temporary register (tr) that holds one of the operands for the multiplier, and ? a 32-bit product register (pr) that holds the product. incorporated into the instruction set are single-cycle multiply/accumulate instructions that allow both operands to be processed simultaneously. the data for these operations may reside anywhere in internal or external memory, and can be transferred to the multiplier each cycle via the program and data buses. four product shift modes are available at the product register (pr) output that are useful when performing multiply/accumulate operations, fractional arithmetic, or justifying fractional products. timer the tms320c2x provides a memory-mapped 16-bit timer for control operations. the on-chip timer (tim) register is a down counter that is continuously clocked by clkout1 on the tms320c25. the timer is clocked by clkout1/4 on the tms32020. a timer interrupt (tint) is generated every time the timer decrements to zero. the timer is reloaded with the value contained in the period (prd) register within the next cycle after it reaches zero so that interrupts may be programmed to occur at regular intervals of prd + 1 cycles of clkout 1 on the tms320c25 or 4 prd clkout 1 cycles on the tms32020. memory control the tms320c2x provides a total of 544 16-bit words of on-chip data ram, divided into three separate blocks (b0, b1, and b2). of the 544 words, 288 words (blocks b1 and b2) are always data memory, and 256 words (block b0) are programmable as either data or program memory. a data memory size of 544 words allows the tms320c2x to handle a data array of 512 words (256 words if on-chip ram is used for program memory), while still leaving 32 locations for intermediate storage. when using block b0 as program memory, instructions can be downloaded from external program memory into on-chip ram and then executed. when using on-chip program ram, rom, eprom, or high-speed external program memory, the tms320c2x runs at full speed without wait states. however, the ready line can be used to interface the tms320c2x to slower, less-expensive external memory. downloading programs from slow off-chip memory to on-chip program ram speeds processing while cutting system costs. the tms320c2x provides three separate address spaces for program memory, data memory, and i/o. the on-chip memory is mapped into either the 64k-word data memory or program memory space, depending upon the memory configuration (see figure 1). the cnfd (configure block b0 as data memory) and cnfp (configure block b0 as program memory) instructions allow dynamic configuration of the memory maps through software. regardless of the configuration, the user may still execute from external program memory. the tms320c2x has six registers that are mapped into the data memory space: a serial port data receive register, serial port data transmit register, timer register, period register, interrupt mask register, and global memory allocation register.
tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 8 pages 8 -511 interrupts and reserved (external) external interrupts and reserved (on-chip rom/eprom) on-chip memory-mapped registers on-chip rom/eprom reserved reserved on-chip block b2 reserved external if mp/mc = 1 (microprocessor mode) if mp/mc = 0 (microcomputer mode on tms320c25) (a) memory maps after a cnfd instruction pages 4-5 pages 1-3 program program data pages 6 -7 interrupts and reserved (external) external interrupts and reserved (on-chip rom/eprom) on-chip memory-mapped registers on-chip rom/eprom reserved on-chip block b2 reserved external external if mp/mc = 1 (microprocessor mode) (b) memory maps after a cnfp instruction program program data on-chip block b0 on-chip block b0 page 0 0(0000h) 31(001fh) 32(0020h ) 65,535(ffffh) 0(0000h) 31(001fh) 32(0020h ) 65,535(0ffffh) 0(0000h) 0(0000h) 31(001fh) 32(0020h ) 65,279(0feffh) 65,280(0ff00h) 5(0005h) 6(0006h) 95(005fh) 96(0060h ) external reserved 4015(0fafh) 4016(0fb0h) 4095(0fffh) 4096(1000h) 65,535(0ffffh) on-chip block b0 on-chip block b1 127(007fh) 128(0080h) 511(01ffh) 512(0200h) 767(02ffh) 768(0300h) 1023(03ffh) 1024(0400h) 65,535(0ffffh) 0(0000h) 31(001fh) 32(0020h ) 4015(0fafh) 4016(0fb0h) 4095(0fffh) 4096(1000h) 65,535(0ffffh) 65,279(0feffh) 65,280(0ff00h) 0(0000h) 5(0005h) 6(0006h) 95(005fh) 96(0060h ) 127(007fh) 128(0080h) 511(01ffh) 512(0200h) 767(02ffh) 768(0300h) 1023(03ffh) 1024(0400h) 65,535(0ffffh) pages 8 -511 pages 4-5 pages 1-3 pages 6 -7 page 0 on-chip block b1 if mp/mc = 0 (microcomputer mode on tms320c25) does not exist figure 1. memory maps
tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 9 interrupts and subroutines the tms320c2x has three external maskable user interrupts int2 -int0 , available for external devices that interrupt the processor. internal interrupts are generated by the serial port (rint and xint), by the timer (tint), and by the software interrupt (trap) instruction. interrupts are prioritized with reset (rs ) having the highest priority and the serial port transmit interrupt (xint) having the lowest priority. all interrupt locations are on two-word boundaries so that branch instructions can be accommodated in those locations if desired. a built-in mechanism protects multicycle instructions from interrupts. if an interrupt occurs during a multicycle instruction, the interrupt is not processed until the instruction is completed. this mechanism applies to instructions that are repeated and to instructions that become multicycle due to the ready signal. external interface the tms320c2x supports a wide range of system interfacing requirements. program, data, and i/o address spaces provide interface to memory and i/o, thus maximizing system throughput. i/o design is simplified by having i/o treated the same way as memory. i/o devices are mapped into the i/o address space using the processor's external address and data buses in the same manner as memory-mapped devices. interface to memory and i/o devices of varying speeds is accomplished by using the ready line. when transactions are made with slower devices, the tms320c2x processor waits until the other device completes its function and signals the processor via the ready line. then, the tms320c2x continues execution. a full-duplex serial port provides communication with serial devices, such as codecs, serial a/d converters, and other serial systems. the interface signals are compatible with codecs and many other serial devices with a minimum of external hardware. the serial port may also be used for intercommunication between processors in multiprocessing applications. the serial port has two memory-mapped registers: the data transmit register (dxr) and the data receive register (drr). both registers operate in either the byte mode or 16-bit word mode, and may be accessed in the same manner as any other data memory location. each register has an external clock, a framing synchronization pulse, and associated shift registers. one method of multiprocessing may be implemented by programming one device to transmit while the others are in the receive mode. the serial port on the tms320c25 is double-buffered and fully static. multiprocessing the flexibility of the tms320c2x allows configurations to satisfy a wide range of system requirements and can be used as follows: ? a standalone processor ? a multiprocessor with devices in parallel ? a slave/host multiprocessor with global memory space ? a peripheral processor interfaced via processor-controlled signals to another device. for multiprocessing applications, the tms320c2x has the capability of allocating global data memory space and communicating with that space via the br (bus request) and ready control signals. global memory is data memory shared by more than one processor. global data memory access must be arbitrated. the 8-bit memory-mapped greg (global memory allocation register) specifies part of the tms320c2x's data memory as global external memory. the contents of the register determine the size of the global memory space. if the current instruction addresses an operand within that space, br is asserted to request control of the bus. the length of the memory cycle is controlled by the ready line. the tms320c2x supports dma (direct memory access) to its external program/data memory using the hold and holda signals. another processor can take complete control of the tms320c2x's external memory by asserting hold low. this causes the tms320c2x to place its address data and control lines in a high-impedance state, and assert holda . on the tms320c2x, program execution from on-chip rom may proceed concurrently when the device is in the hold mode.
tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 10 instruction set the tms320c2x microprocessor implements a comprehensive instruction set that supports both numeric-intensive signal processing operations as well as general-purpose applications, such as multiprocessing and high-speed control. the tms32020 source code is upward-compatible with tms320c25 source code. tms32020 object code runs directly on the tms320c25. for maximum throughput, the next instruction is prefetched while the current one is being executed. since the same data lines are used to communicate to external data/program or i/o space, the number of cycles may vary depending upon whether the next data operand fetch is from internal or external memory. highest throughput is achieved by maintaining data memory on-chip and using either internal or fast external program memory. addressing modes the tms320c2x instruction set provides three memory addressing modes: direct, indirect, and immediate addressing. both direct and indirect addressing can be used to access data memory. in direct addressing, seven bits of the instruction word are concatenated with the nine bits of the data memory page pointer to form the 16-bit data memory address. indirect addressing accesses data memory through the auxiliary registers. in immediate addressing, the data is based on a portion of the instruction word(s). in direct memory addressing, the instruction word contains the lower seven bits of the data memory address. this field is concatenated with the nine bits of the data memory page pointer to form the full 16-bit address. thus, memory is paged in the direct addressing mode with a total of 512 pages, each page containing 128 words. up to eight auxiliary registers (ar0-ar7) provide flexible and powerful indirect addressing (five on the tms32020, eight on the tms320c25). to select a specific auxiliary register, the auxiliary register pointer (arp) is loaded with a value from 0 to 7 for ar0 through ar7, respectively. there are seven types of indirect addressing: auto-increment or auto-decrement, post-indexing by either adding or subtracting the contents of ar0, single indirect addressing with no increment or decrement, and bit-reversal addressing (used in ffts on the tms320c25 only) with increment or decrement. all operations are performed on the current auxiliary register in the same cycle as the original instruction, following which the current auxiliary register and arp may be modified. repeat feature a repeat feature, used with instructions such as multiply/accumulates, block moves, i/o transfers, and table read/writes, allows a single instruction to be performed up to 256 times. the repeat counter (rptc) is loaded with either a data memory value (rpt instruction) or an immediate value (rptk instruction). the value of this operand is one less than the number of times that the next instruction is executed. those instructions that are normally multicycle are pipelined when using the repeat feature, and effectively become single-cycle instructions.
tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 11 instruction set summary table 2 lists the symbols and abbreviations used in table 3, the tms320c25 instruction set summary. table 3 consists primarily of single-cycle, single-word instructions. infrequently used branch, i/o, and call instructions are multicycle. the instruction set summary is arranged according to function and alphabetized within each functional grouping. the symbol ( 2 ) indicates those instructions that are not included in the tms320c1x instruction set. the symbol ( 3 ) indicates instructions that are not included in the tms32020 instruction set. table 2. instruction symbols symbol definition b cm d fo i k pa pm ar s x 4-bit field specifying a bit code 2-bit field specifying compare mode data memory address field format status bit addressing mode bit immediate operand field port address (pa0 through pa15 are predefined assembler symbols equal to 0 through 15, respectively.) 2-bit field specifying p register output shift code 3-bit operand field specifying auxiliary register 4-bit left-shift code 3-bit accumulator left-shift field
s no. words d description d d k d d s d s s d d s d s s x d d x s d d d d k d mnemonic k instruction bit code tms320c25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 12 table 3. tms320c25 instruction set summary accumulator memory reference instructions 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 abs absolute value of accumulator 1 1 1 0 0 1 1 1 0 0 0 0 1 1 0 1 1 add add to accumulator with shift 1 0 000 i addc 3 add to accumulator with carry 1 0 1000011i addh add to high accumulator 1 0 1001000i addk 3 add to accumulator short immediate 1 1 1001100 adds add to low accumulator with sign extension suppressed 1 0 1001001i addt add to accumulator with shift specified by t register 1 0 1001010i adlk 2 add to accumulator long immediate with shift 2 1 1 0 1 00000010 and and with accumulator 1 0 1001110i andk 2 and immediate with accumulator with shift 2 1 1 0 1 00000100 cmpl 2 complement accumulator 1 1 100111000100111 lac load accumulator with shift 1 0 010 i lack load accumulator immediate short 1 1 1001010 lact 2 load accumulator with shift specified by t register 1 0 1000010i lalk 2 load accumulator long immediate with shift 2 1 1 0 1 00000001 neg 2 negate accumulator 1 1 100111000100011 norm 2 normalize contents of accumulator 1 1 10011101xxx0010 or or with accumulator 1 0 1001101i ork 2 or immediate with accumulator with shift 2 1 1 0 1 00000101 rol 3 rotate accumulator left 1 1 100111000110100 ror 3 rotate accumulator right 1 1 100111000110101 sach store high accumulator with shift 1 0 1101 i sacl store low-order accumulator with shift 1 0 1100 i sblk2 subtract from accumulator long immediate with shift 2 1 1 0 1 00000011 sfl 2 shift accumulator left 1 1 100111000011000 sfr 2 shift accumulator right 1 1 100111000011001 sub subtract from accumulator with shift 1 0 001 i subb 3 subtract from accumulator with borrow 1 0 1001111i subc conditional subtract 1 0 1000111i subh subtract from high accumulator 1 0 1000100i subk 3 subtract from accumulator short immediate 1 1 1001101 subs subtract from low accumulator with sign extension suppressed 1 0 1 0 0 0 1 0 1 i 2 these instructions are not included in the tms320c1x instruction set. 3 these instructions are not included in the tms32020 instruction set.
s d d d d d no. words description instruction bit code mnemonic no. words description instruction bit code mnemonic k d r k r d dp r d d r k r cm tms320c25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 13 table 3. tms320c25 instruction set summary (continued) accumulator memory reference instructions 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 subt 2 subtract from accumulator with shift specified by t register 1 0 1 0 0 0 1 1 0 i xor exclusive-or with accumulator 1 0 1001100i xork 2 exclusive-or immediate with accumulator with shift 2 1 1 0 1 00000110 zac zero accumulator 1 1 100101000000000 zalh zero low accumulator and load high accumulator 1 0 1000000i zalr 3 zero low accumulator and load high accumulator with rounding 1 0 1111011i zals zero accumulator and load low accumulator with sign extension suppressed 1 0 1000001i auxiliary registers and data page pointer instructions 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 adrk 3 add to auxiliary register short immediate 1 0 1 1 1 1 1 1 0 cmpr 2 compare auxiliary register with auxiliary register ar0 1 1 1001110010100 lar load auxiliary register 1 0 0110 i lark load auxilliary register short immediate 1 1 1000 larp load auxilliary register pointer 1 0 101010110001 ldp load data memory page pointer 1 0 1010010i ldpk load data memory page pointer immediate 1 1 100100 lrlk 2 load auxiliary register long immediate 2 1 1010 00000000 mar modify auxiliary register 1 0 1010101i sar store auxiliary register 1 0 1110 i sbrk 3 subtract from auxiliary register short immediate 1 0 1 1 1 1 1 1 1 2 these instructions are not included in the tms320c1x instruction set. 3 these instructions are not included in the tms32020 instruction set.
no. words description instruction bit code mnemonic d d d d d d d d d d d d d d d d pm k tms320c25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 14 table 3. tms320c25 instruction set summary (continued) t register, p register, and multiply instructions 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 apac add p register to accumulator 1 1 1 0 0 1 1 1 0 0 0 0 1 0 1 0 1 lph 2 load high p register 1 0 1010011i lt load t register 1 0 0111100i lta load t register and accumulate previous product 1 0 0111101i ltd load t register, accumulate previous product, and move data 1 0 0111111i ltp 2 load t register and store p register in accumulator 1 0 0111110i lts 2 load t register and subtract previous product 1 0 1011011i mac 2 multiply and accumulate 2 0 1011101i macd 2 multiply and accumulate with data move 2 0 1011100i mpy multiply (with t register, store product in p register) 1 0 0111000i mpya 3 multiply and accumulate previous product 1 0 0111010i mpyk multiply immediate 1 1 01 mpys3 multiply and subtract previous product 1 0 0111011i mpyu3 multiply unsigned 1 1 1001111i pac load accumulator with p register 1 1 100111000010100 spac subtract p register from accumulator 1 1 100111000010110 sph 3 store high p register 1 0 1111101i spl 3 store low p register 1 0 1111100i spm 2 set p register output shift mode 1 1 1001110000010 sqra 2 square and accumulate 1 0 0111001i sqrs 2 square and subtract previous product 1 0 1 0 1 1 0 1 0 i 2 these instructions are not included in the tms320c1x instruction set. 3 these instructions are not included in the tms32020 instruction set.
no. words description instruction bit code mnemonic d d d d d d d d d d d d d d d d no. words description instruction bit code mnemonic d d d d d d d pa pa tms320c25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 15 table 3. tms320c25 instruction set summary (continued) branch/call instructions 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 b branch unconditionally 2 1 1 1 1 1 1 1 1 1 bacc 2 branch to address specified by accumulator 1 1 100111000100101 banz branch on auxiliary register not zero 2 1 11110111 bbnz 2 branch if tc bit 02 1 11110011 bbz 2 branch if tc bit = 0 2 1 11110001 bc 3 branch on carry 2 0 10111101 bgez branch if accumulator 02 1 11101001 bgz branch if accumulator > 0 2 1 11100011 bioz branch on i/o status = 0 2 1 11110101 blez branch if accumulator 02 1 11100101 blz branch if accumulator < 0 2 1 11100111 bnc 3 branch on no carry 2 0 10111111 bnv 2 branch if no overflow 2 1 11101111 bnz branch if accumulator 02 1 11101011 bv branch on overflow 2 1 11100001 bz branch if accumulator = 0 2 1 11101101 cala call subroutine indirect 1 1 100111000100100 call call subroutine 2 1 11111101 ret return from subroutine 1 1 100111000100110 i/o and data memory operations 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 blkd 2 block move from data memory to data memory 2 1 1 1 0 1 1 0 1 i blkp 2 block move from program memory to data memory 2 1 1111100i dmov data move in data memory 1 0 1010110i fort 2 format serial port registers 1 1 10011100000111fo in input data from port 1 1 000 i out output data to port 1 1 110 i rfsm 3 reset serial port frame synchronization mode 1 1 100111000110110 rtxm 2 reset serial port transmit mode 1 1 100111000100000 rxf 2 reset external flag 1 1 100111000001100 sfsm 3 set serial port frame synchronization mode 1 1 100111000110111 stxm 2 set serial port transmit mode 1 1 100111000100001 sxf 2 set external flag 1 1 100111000001101 tblr table read 1 0 1011000i tblw table write 1 0 1 0 1 1 0 0 1 i 2 these instructions are not included in the tms320c1x instruction set. 3 these instructions are not included in the tms32020 instruction set.
d no. words description instruction bit code mnemonic d d d d d d b d d k tms320c25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 16 table 3. tms320c25 instruction set summary (concluded) control instructions 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 bit 2 test bit 1 1 0 0 1 i bitt 2 test bit specified by t register 1 0 1010111i cnfd 2 configure block as data memory 1 1 100111000000100 cnfp 2 configure block as program memory 1 1 100111000000101 dint disable interrupt 1 1 100111000000001 eint enable interrupt 1 1 100111000000000 idle 2 idle until interrupt 1 1 100111000011111 lst load status register sto 1 0 1010000i lst1 2 load status register st1 1 0 1010001i nop no operation 1 0 101010100000000 pop pop top of stack to low accumulator 1 1 100111000011101 popd 2 pop top of stack to data memory 1 0 1111010i pshd 2 push data memory value onto stack 1 0 1010100i push push low accumulator onto stack 1 1 100111000011100 rc 3 reset carry bit 1 1 100111000110000 rhm 3 reset hold mode 1 1 100111000111000 rovm reset overflow mode 1 1 100111000000010 rpt 2 repeat instruction as specified by data memory value 1 0 1001011i rptk 2 repeat instruction as specified by immediate value 1 1 1001011 rsxm 2 reset sign-extension mode 1 1 100111000000110 rtc 3 reset test/control flag 1 1 100111000110010 sc 3 set carry bit 1 1 100111000110001 shm 3 set hold mode 1 1 100111000111001 sovm set overflow mode 1 1 100111000000011 sst store status register st0 1 0 1111000i sst1 2 store status register st1 1 0 1111001i ssxm 2 set sign-extension mode 1 1 100111000000111 stc 3 set test/control flag 1 1 100111000110011 trap 2 software interrupt 1 1 1 0 0 1 1 1 0 0 0 0 1 1 1 1 0 2 these instructions are not included in the tms320c1x instruction set. 3 these instructions are not included in the tms32020 instruction set.
tms32020 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 17 tms32020 product notification texas instruments has identified an unusual set of circumstances that will cause the bit (test bit) instruction on the tms32020 to affect the contents of the accumulator; ideally, the bit instruction should not affect the accumulator. this set of conditions is: 1. the overflow mode is set (the ovm status register bit is set to one.) 2. and, the two lsbs of the bit instruction opcode word are zero. a. when direct memory addressing is used, every fourth data word is affected; all other locations are not affected. b. when indirect addressing is used, the two lsbs will be zero if a new arp is not selected or if a new arp is selected and that arp is 0 or 4. 3. and, adding the contents of the accumulator with the contents of the addressed data memory location, shifted by 2 (bit code) , causes an overflow of the accumulator. if all of these conditions are met, the contents of the accumulator will be replaced by the positive or negative saturation value, depending on the polarity of the overflow. various methods for avoiding this phenomenon are available: ? if the tms32020 is not in the saturation mode when the bit instruction is executed, the device operates properly and the accumulator is not affected. ? execute the reset overflow mode (rovm) instruction immediately prior to the bit instruction and the set overflow mode (sovm) instruction immediately following the bit instruction. ? if direct memory addressing is being used during the bit instructions, reorganize memory so that the page relative locations 0, 4, 8, c, 10 . . . are not used. ? if indirect addressing is being used during the bit instruction, select a new arp which is not ar0 or ar4. if necessary, follow the instruction with a larp ar0 or larp ar4 to restore the code. ? use the test bit specified by t register (bitt) instruction instead of the bit instruction. the bitt instruction operates correctly and will not affect the accumulator under any circumstances. ? replace tms32020 with tms320c25 for ideal pin-to-pin and object-code compatibility. the bit instruction on the tms320c25 executes properly and will not affect the accumulator under any circumstances.
tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 18 development support together, texas instruments and its authorized third-party suppliers offer an extensive line of development support products to assist the user in all aspects of tms320 second-generation-based design and development. these products range from development and application software to complete hardware development and evaluation systems. table 4 lists the development support products for the second-generation tms320 devices. system development may begin with the use of the simulator, software development system (swds), or emulator (xds) along with an assembler/linker. these tools give the tms320 user various means of evaluation, from software simulation of the second-generation tms320s (simulator) to full-speed in-circuit emulation with hardware and software breakpoint trace and timing capabilities (xds). software and hardware can be developed simultaneously by using the macro assembler/linker, c compiler, and simulator for software development, the xds for hardware development, and the software development system for both software development and limited hardware development. many third-party vendors offer additional development support for the second-generation tms320s, including assembler/linkers, simulators, high-level languages, applications software, algorithm development tools, application boards, software development boards, and in-circuit emulators. refer to the tms320 family development support reference guide (spru011a) for further information about tms320 development support products offered by both texas instruments and its third-party suppliers. additional support for the tms320 products consists of an extensive library or product and applications documentation. three-day dsp design workshops are offered by the ti regional technology centers (rtcs). these workshops provide insight into the architecture and the instruction set of the second-generation tms320s as well as hands-on training with the tms320 development tools. when technical questions arise regarding the tms320 family, contact the texas instruments tms320 hotline at (713) 274-2320. or, keep informed on the latest ti and third-party development support tools by accessing the dsp bulletin board service (bbs) at (713) 274-2323. the bbs serves 2400-, 1200- and 300-bps modems. also, tms320 application source code may be downloaded from the bbs.
tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 19 table 4. tms320 second-generation software and hardware support software tools part number macro assembler/linker ibm ms/pc-dos tmds3242850-02 vax/vms tmds3242250-08 vax ultrix tmds3242260-08 sun unix tmds3242550-08 simulator ibm ms/pc-dos tmds3242851-02 vax/vms tmds3242251-08 c compiler ibm ms/pc-dos tmdx3242855-02 vax/vms tmdx3242255-08 vax ultrix tmdx3242265-08 sun unix tmdx3242555-08 digital filter design package (dfdp) ibm pc-dos dfdp-ibm002 dsp software library ibm ms/pc-dos tmdc3240812-12 vax/vms tmdc3204212-18 hardware tools part number analog interface board 2 (aib2) rtc/aib320a-06 analog interface board adaptor rtc/adp320a-06 eprom programmer adaptor socket (68 to 28-pin) tmdx3270120 software development system (swds) tmdx3268821 xds/22 emulator (see note) tmds3262221 xds/22 upgrade (tms32020 to tms320c2x) tmdx3282226 note: emulation support for the tms320c25-50 is available from macrochip research, inc.; refer to the tms320 family development support reference guide (spru011a) for the mailing address. ibm is a trademark of international business machines corporation. pc-dos is a trademark of international business machines corporation. vax and vms are trademarks of digital equipment corporation. xds is a trademark of texas instruments incorporated.
tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 20 documentation support extensive documentation supports the second-generation tms320 devices from product announcement through applications development. the types of documentation include data sheets with design specifications, complete user's guides, and 750 pages of application reports published in the book, digital signal processing applications with the tms320 family (spra012a). an application report, hardware interfacing to the tms320c25 (spra014a), is available for that device. a series of dsp textbooks is being published by prentice-hall and john wiley & sons to support digital signal processing research and education. the tms320 newsletter, details on signal processing , is published quarterly and distributed to update tms320 customers on product information. the tms320 dsp bulletin board service provides access to large amounts of information pertaining to the tms320 family. refer to the tms320 family development support reference guide (spru011a) for further information about tms320 documentation. to receive copies of second-generation tms320 literature, call the customer response center at 1-800-232-3200. specification overview the electrical specifications for the tms32020, tms320c25, tms320e25, and tms320c25-50 are given in the following pages. note that the electrical specifications for the tms320e25 are identical to those for the tms320c25, with the addition of eprom-related specifications. a summary of differences between tms320c25 and tms320c25-50 specifications immediately follows the tms320c25-50 specification.
high-level input voltage low-level input voltage v il v ih tms32020 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 21 absolute maximum ratings over specified temperature range (unless otherwise noted)2 supply voltage range, v cc 3 0.3 v to 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . input voltage range 0.3 v to 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . output voltage range 0.3 v to 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . continuous power dissipation 2 w . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . operating free-air temperature range 0 c to 70 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . storage temperature range 55 c to 150 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 stresses beyond those listed under aabsolute maximum ratingso may cause permanent damage to the device. this is a stress rating only, and functional operation of the device at these or any other conditions beyond those indicated in the arecommended operating condit ionso section of this specification is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliabi lity. 3 all voltage values are with respect to v ss . recommended operating conditions min nom max unit v cc supply voltage 4.75 5 5.25 v v ss supply voltage 0 v all inputs except clkin 2 v cc + 0.3 v clkin 2.4 v cc + 0.3 v all inputs except clkin 0.3 0.8 v clkin 0.3 0.8 v i oh high-level output current 300 m a i ol low-level output current 2 ma t a operating free-air temperature (see notes 1 and 2) 0 70 c notes: 1. case temperature (t c ) must be maintained below 90 c. 2. r q ja = 36 c/watt, r q jc = 6 c/watt. electrical characteristics over specified free-air temperature range (unless otherwise noted) parameter test conditions min typ max unit v oh high-level output voltage v cc = min, i oh = max 2.4 3 v v ol low-level output voltage v cc = min, i ol = max 0.3 0.6 v i z three-state current v cc = max 20 20 m a i i input current v i = v ss to v cc 10 10 m a t a = 0 c, v cc = max, f x = max 360 ma i cc supply current t a = 25 c, v cc = max, f x = max 250 ma t c = 90 c, v cc = max, f x = max 285 ma c i input capacitance 15 pf c o output capacitance 15 pf all typical values for i cc are at v cc = 5 v, t a = 25 c. this device contains circuits to protect its inputs and outputs against damage due to high static voltages or electrostatic fie lds. these circuits have been qualified to protect this device against electrostatic discharges (esd) of up to 2 kv according to mil-std-8 83c, method 3015; however, it is advised that precautions should be taken to avoid application of any voltage higher than maximum-ra ted voltages to these high-impedance circuits. during storage or handling, the device leads should be shorted together or the devic e should be placed in conductive foam. in a circuit, unused inputs should always be connected to an appropriated logic voltage le vel, preferably either v cc or ground. specific guidelines for handling devices of this type are contained in the publication guidelines for handling electrostatic-discharge-sensitive (esds) devices and assemblies available from texas instruments. advance information
tms32020 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 22 clock characteristics and timing the tms32020 can use either its internal oscillator or an external frequency source for a clock. internal clock option the internal oscillator is enabled by connecting a crystal across x1 and x2/clkin (see figure 2). the frequency of clkout1 is one-fourth the crystal fundamental frequency. the crystal should be fundamental mode, and parallel resonant, with an effective series resistance of 30 w , a power dissipation of 1 mw, and be specified at a load capacitance of 20 pf. parameter test conditions min typ 2 max unit f x input clock frequency t a = 0 c to 70 c 6.7 20.5 mhz f xs serial port frequency t a = 0 c to 70 c 50 2 2563 mhz c1, c2 t a = 0 c to 70 c 10 pf 2 value derived from characterization data; minimum f sx at test = 825 khz. x2/clkin c2 c1 x1 crystal figure 2. internal clock option external clock option an external frequency source can be used by injecting the frequency directly into x2/clkin with x1 left unconnected. the external frequency injected must conform to the specifications listed in the following table. switching characteristics over recommended operating conditions (see note 3) parameter min nom max unit t c(c) clkout1/clkout2 cycle time 195 597 ns t d(cih-c) clkin high to clkout1/clkout2/strb high/low 25 60 ns t f(c) clkout1/clkout2/strb fall time 10 ns t r(c) clkout1/clkout2/strb rise time 10 ns t w(cl) clkout1/clkout2 low pulse duration 2q 15 2q 2q + 15 ns t w(ch) clkout1/clkout2 high pulse duration 2q 15 2q 2q + 15 ns td(c1-c2) clkout1 high to clkout2 low, clkout2 high to clkout1 high, etc. q 10 q q+10 ns note 3: q = 1/4t c(c) . advance information
tms32020 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 23 timing requirements over recommended operating conditions (see note 3) min nom max unit t c(c) clkin cycle time 195 597 ns t f(ci) clkin fall time 10 2 ns t r(ci) clkin rise time 10 2 ns t w(cil) clkin low pulse duration, t c(ci) = 50 ns (see note 4) 40 ns t w(cih) clkin high pulse duration, t c(ci) = 50 ns (see note 4) 40 ns t su(s) sync setup time before clkin low 10 q 10 ns t h(s) sync hold time from clkin low 15 ns 2 value derived from characterization data and not tested. notes: 3. q = 1/4t c(c) . 4. clkin duty cycle [t r(ci) + t w(cih)] /t c(ci) must be within 40-60%. c l = 100 pf 2.15 v r l = 825 w test point from output under test figure 3. test load circuit 0.80 v 0.92 v 1.88 v 2.0 v 0 v ih (min) v il (max) (a) input 0.6 v 0.8 v 2.2 v 2.4 v 0 v oh (min) v ol (max) (b) output figure 4. voltage reference levels advance information
tms32020 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 24 memory and peripheral interface timing switching characteristics over recommended operating conditions (see note 3) parameter min typ max unit t d(c1-s) strb from clkout1 (if strb is present) q 15 q q + 15 ns t d(c2-s) clkout2 to strb (if strb is present) 15 0 15 ns t su(a) address setup hold time before strb low (see note 5) q 30 ns t h(a) address hold time after strb high (see note 5) q 15 ns t w(sl) strb low pulse duration (no wait states, see note 6) 2q ns t w(sh) strb high pulse duration (between consecutive cycles, see note 6) 2q ns t su(d)w data write setup time before strb high (no wait states) 2q 45 ns t h(d)w data write hold time from strb high q 15 q ns t en(d) data bus starts being driven after strb low (write cycle) 0 2 ns t dis(d) data bus three-state after strb high (write cycle) q q+30 2 ns t d(msc) msc valid from clkout1 25 0 25 ns 2 value derived from characterization data and not tested. notes: 3. q = 1/4t c(c) . 5. a15-a0, ps , ds , is , r/w , and br timings are all included in timings referenced as aaddresso. 6. delays between clkout1/clkout2 edges and strb edges track each other, resulting in t w(sl) and t w(sh) being 2q with no wait states. timing requirements over recommended operating conditions (see note 3) min nom max unit t a(a) read data access time from address time (read cycle, see notes 5 and 7) 3q 70 2 ns t su(d)r data read setup time before strb high 40 ns t h(d)r data read hold time from strb high 0 ns t d(sl-r) ready valid after strb low (no wait states) q 40 ns t d(c2h-r) ready valid after clkout2 high q 40 ns t h(sl-r) ready hold time after strb low (no wait states) q 5 ns t h(c2h-r) ready hold after clkout2 high q 5 ns t d(m-r) ready valid after msc valid 2q 50 ns t h(m-r) ready hold time after msc valid 0 ns 2 value derived from characterization data and not tested. notes: 3. q = 1/4t c(c) . 5. a15-a0, ps , ds , is , r/w , and br timings are all included in timings referenced as aaddresso. 7. read data access time is defined as t a(a) = t su(a) + t w(sl) t su(d)r . advance information
tms32020 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 25 rs , int , bio , and xf timing switching characteristics over recommended operating conditions (see note 3 and 8) parameter min typ max unit t d(rs) clkout1 low to reset state entered 45 ns t d(iack) clkout1 to iack valid 25 0 25 ns t d(xf) xf valid before falling edge of strb q 30 ns notes: 3. q = 1/4t c(c) . 8. rs , int , and bio are asynchronous inputs and can occur at any time during a clock cycle. however, if the specified setup time is met, the exact sequence shown in the timing diagrams will occur. timing requirements over recommended operating conditions (see note 3 and 8) min nom max unit t su(in) int /bio /rs setup before clkout1 high 50 ns t h(in) int /bio /rs hold after clkout1 high 0 ns t f(in) int /bio fall time 15 2 ns t w(in) int /bio low pulse duration t c(c) ns t w(rs) rs low pulse duration 3t c(c) ns 2 value derived from characterization data and not tested. notes: 3. q = 1/4t c(c) . 8. rs , int , and bio are asynchronous inputs and can occur at any time during a clock cycle. however, if the specified setup time is met, the exact sequence shown in the timing diagrams will occur. hold timing switching characteristics over recommended operating conditions (see note 3) parameter min typ max unit t d(c1l-al) holda low after clkout1 low 25 2 25 ns t dis(al-a) holda low to address three-state 15 2 ns t dis(c1l-a) address three-state after clkout1 low (hold mode, see note 9) 30 2 ns t d(hh-ah) hold high to holda high 50 ns t en(a-c1l) address driven before clkout1 low (hold mode, see note 9) 10 2 ns 2 value derived from characterization data and not tested. notes: 3. q = 1/4t c(c) . 9. a15-a0, ps , ds , is , strb , and r/w timings are all included in timings referenced as aaddress.o timing requirements over recommended operating conditions (see note 3) min nom max unit t d(c2h-h) hold valid after clkout2 high q 45 ns note 3: q = 1/4t c(c) . advance information
tms32020 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 26 serial port timing switching characteristics over recommended operating conditions (see note 3) parameter min typ max unit t d(ch-dx) dx valid after clkx rising edge (see note 10) 100 ns t d(fl-dx) dx valid after fsx falling edge (txm = 0, see note 10) 50 ns t d(ch-fs) fsx valid after clkx rising edge (txm = 1) 60 ns notes: 3. q = 1/4t c(c) . 10. the last occurrence of fsx falling and clkx rising. timing requirements over recommended operating conditions (see note 3) min nom max unit t c(sck) serial port clock (clkx/clkr) cycle time 390 20 000 2 ns t f(sck) serial port clock (clkx/clkr) fall time 50 3 ns t r(sck) serial port clock (clkx/clkr) rise time 50 3 ns t w(sck) serial port clock (clkx/clkr) low pulse duration (see note 11) 150 12 000 ns t w(sck) serial port clock (clkx/clkr) high pulse duration (see note 11) 150 12 000 ns t su(fs) fsx/fsr setup time before clkx/clkr falling edge (txm = 0) 20 ns t h(fs) fsx/fsr hold time after clkx/clkr falling edge (txm = 0) 20 ns t su(dr) dr setup time before clkr falling edge 20 ns t h(dr) dr hold time after clkr falling edge 20 ns 2 value derived from characterization data; minimum f sx at test = 825 khz. 3 value derived from characterization data and not tested. notes: 3. q = 1/4t c(c) . 11. the duty cycle of the serial port clock must be within 40-60%. advance information
v il t a low-level input voltage operating free-air temperature i cc low-level input voltage t a = 0 c, v cc = max, f x = max ma tms320c25, tms320e25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 27 absolute maximum ratings over specified temperature range (unless otherwise noted) 2 supply voltage range, v cc 3 0.3 v to 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . input voltage range: tms320e25 pins 24 and 25 0.3 v to 15 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . all other inputs 0.3 v to 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . output voltage range 0.3 v to 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . continuous power dissipation 1.5 w . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . operating free-air temperature range 0 c to 70 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . storage temperature range 55 c to 150 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 stresses beyond those listed under aabsolute maximum ratingso may cause permanent damage to the device. this is a stress rating only, and functional operation of the device at these or any other conditions beyond those indicated in the arecommended operating condit ionso section of this specification is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliabi lity. 3 all voltage values are with respect to v ss . recommended operating conditions min nom max unit v cc supply voltage 4.75 5 5.25 v v ss supply voltage 0 v all inputs except clkin/clkx/clkr/int (0-2) 2.35 v cc + 0.3 v v ih high-level input voltage int (0-2) 2.5 v cc + 0.3 v clkin / clkx / clkr 3.5 v cc + 0.3 v all inputs except mp/ mc 0.3 0.8 v mp/ mc 0.3 0.8 v i oh high-level output current 300 m a i ol low-level output current 2 ma tms320c25, tms320e25 0 70 c tms320c25gba 40 85 c electrical characteristics over specified free-air temperature range (unless otherwise noted) parameter test conditions min typ max unit v oh high-level output voltage v cc = min, i oh = max 2.4 3 v v ol low-level output voltage v cc = min, i ol = max 0.3 0.6 v i z three-state current v cc = max 20 20 m a i i input current v i = v ss to v cc 10 10 m a normal 110 185 idle/hold 50 100 c i input capacitance 15 pf c o output capacitance 15 pf all typical values are at v cc = 5 v, t a = 25 . caution. this device contains circuits to protect its inputs and outputs against damage due to high static voltages or electros tatic fields. these circuits have been qualified to protect this device against electrostatic discharges (esd) of up to 2 kv accordin g to mil-std-883c, method 3015; however, it is advised that precautions to be taken to avoid application of any voltage higher than maximum rated voltages to these high-impedance circuits. during storage or handling, the device leads should be shorted togethe r or the device should be placed in conductive foam. in a circuit, unused inputs should always be connected to an appropriate log ic voltage level, preferably either v cc or ground. specific guidelines for handling devices of this type are contained in the publication aguidelines for handling electrostatic-discharge sensitive (esds) devices and assemblieso available from texas instruments advance information
tms320c25, tms320e25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 28 clock characteristics and timing the tms32025 can use either its internal oscillator or an external frequency source for a clock. internal clock option the internal oscillator is enabled by connecting a crystal across x1 and x2/clkin (see figure 2). the frequency of clkout1 is one-fourth the crystal fundamental frequency. the crystal should be either fundamental or overtone mode, and parallel resonant, with an effective series resistance of 30 w , a power dissipation of 1 mw, and be specified at a load capacitance of 20 pf. note that overtone crystals require an additional tuned lc circuit; see the application report, hardware interfacing to the tms320c25 (spra014a). parameter test conditions min typ max unit f x input clock frequency t a = 0 c to 70 c 6.7 40.96 mhz f xs serial port frequency t a = 0 c to 70 c 0 2 5 120 mhz c1, c2 t a = 0 c to 70 c 10 pf 2 the serial port was tested at a minimum frequency of 1.25 mhz. however, the serial port was fully static but will properly func tion down to f sx = 0 hz. x2/clkin c2 c1 x1 crystal figure 2. internal clock option external clock option an external frequency source can be used by injecting the frequency directly into x2/clkin with x1 left unconnected. the external frequency injected must conform to the specifications listed in the following table. switching characteristics over recommended operating conditions (see note 3) parameter min typ max unit t c(c) clkout1/clkout2 cycle time 97.7 597 ns t d(cih-c) clkin high to clkout1/clkout2/strb high/low 5 30 ns t f(c) clkout1/clkout2/strb fall time 5 ns t r(c) clkout1/clkout2/strb rise time 5 ns t w(cl) clkout1/clkout2 low pulse duration 2q 8 2q 2q + 8 ns t w(ch) clkout1/clkout2 high pulse duration 2q 8 2q 2q + 8 ns t d(c1-c2 ) clkout1 high to clkout2 low, clkout2 high to clkout1 high, etc. q 5 q q + 5 ns note 3: q = 1/4t c(c) . advance information
tms320c25, tms320e25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 29 timing requirements over recommended operating conditions (see note 3) min nom max unit t c(ci) clkin cycle time 24.4 150 ns t f(ci) clkin fall time 5 2 ns t r(ci) clkin rise time 5 2 ns t w(cil) clkin low pulse duration, t c(ci) = 50 ns (see note 4) 20 ns t w(cih) clkin high pulse duration, t c(ci) = 50 ns (see note 4) 20 ns t su(s) sync setup time before clkin low 5 q 5 ns t h(s) sync hold time from clkin low 8 ns 2 value derived from characterization data and not tested. notes: 3. q = 1/4t c(c) . 4. clkin duty cycle [t r(ci) + t w(cih) ]/t c(ci) must be within 40-60%. +5 v f crystal 4.7 k w 10 k w 74hc04 f11 clkin 47 pf 74as04 10 k w c = 20 pf 0.1 m f l tms320c25 tms320c25 tms320c25-50 tms320e25 40.96 51.20 40.96 1.8 1.0 1.8 f crystal, (mhz) l, ( m h) figure 3. external clock option shown above is a crystal oscillator circuit suitable for providing the input clock signal to the tms320c25, tms320e25, and tms320c25-50. please refer to hardware interfacing to the tms320c25 (document number spra014a) for details on circuit operation. c l = 100 pf 2.15 v r l = 825 w test point from output under test figure 4. test load circuit advance information
tms320c25, tms320e25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 30 0.80 v 0.92 v 1.88 v 2.0 v 0 v ih (min) v il (max) (a) input 0.6 v 0.8 v 2.2 v 2.4 v 0 v oh (min) v ol (max) (b) output figure 5. voltage reference levels memory and peripheral interface timing switching characteristics over recommended operating conditions (see note 3) parameter min typ max unit t d(c1-s) strb from clkout1 (if strb is present) q 6 q q + 6 ns t d(c2-s) clkout2 to strb (if strb is present) 6 0 6 ns t su(a) address setup time before strb low (see note 5) q 12 ns t h(a) address hold time after strb high (see note 5) q 8 ns t w(sl) strb low pulse duration (no wait states, see note 6) 2q 5 2q + 5 ns t w(sh) strb high pulse duration (between consecutive cycles, see note 6) 2q 5 2q + 5 ns t su(d)w data write setup time before strb high (no wait states) 2q 20 ns t h(d)w data write hold time from strb high q 10 q ns t en(d) data bus starts being driven after strb low (write cycle) 0 2 ns t dis(d) data bus three-state after strb high (write cycle) q q+15 2 ns t d(msc) msc valid from clkout1 12 0 12 ns 2 value derived from characterization data and not tested. notes: 3. q = 1/4t c(c) . 5. a15-a0, ps , ds , is , r/w , and br timings are all included in timings referenced as aaddresso. 6. delays between clkout1/clkout2 edges and strb edges track each other, resulting in t w(sl) and t w(sh) being 2q with no wait states. timing requirements over recommended operating conditions (see note 3) min nom max unit t a(a) read data access time from address time (read cycle, see notes 5 and 7) 3q 35 ns t su(d)r data read setup time before strb high 23 ns t h(d)r data read hold time from strb high 0 ns t d(sl-r) ready valid after strb low (no wait states) q 20 ns t d(c2h-r) ready valid after clkout2 high q 20 ns t h(sl-r) ready hold time after strb low (no wait states) q + 3 ns t h(c2h-r) ready hold after clkout2 high q + 3 ns t d(m-r) ready valid after msc valid 2q 25 ns t h(m-r) ready hold time after msc valid 0 ns notes: 3. q = 1/4t c(c) . 5. a15-a0, ps , ds , is , r/w , and br timings are all included in timings referenced as aaddresso. 7. read data access time is defines as t a(a) = t su(a) + t w(sl) t su(d)r . advance information
tms320c25, tms320e25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 31 rs , int , bio , and xf timing switching characteristics over recommended operating conditions (see note 3 and 8) parameter min typ max unit t d(rs) clkout1 low to reset state entered 22 2 ns t d(iack) clkout1 to iack valid 6 0 12 ns t d(xf) xf valid before falling edge of strb q 15 ns notes: 3. q = 1/4t c(c) . 8. rs , int , and bio are asynchronous inputs and can occur at any time during a clock cycle. however, if the specified setup time is met, the exact sequence shown in the timing diagrams will occur. timing requirements over recommended operating conditions (see note 3 and 8) min nom max unit t su(in) int /bio /rs setup before clkout1 high 32 ns t h(in) int /bio /rs hold after clkout1 high 0 ns t f(in) int /bio fall time 8 2 ns t w(in) int /bio low pulse duration t c(c) ns t w(rs) rs low pulse duration 3 tc(c) ns 2 value derived from characterization data and not tested. notes: 3. q = 1/4t c(c) . 8. rs , int , and bio are asynchronous inputs and can occur at any time during a clock cycle. however, if the specified setup time is met, the exact sequence shown in the timing diagrams will occur. hold timing switching characteristics over recommended operating conditions (see note 3) parameter min typ max unit t d(c1l-al) holda low after clkout1 low 0 10 ns t dis(al-a) holda low to address three-state 0 2 ns t dis(c1l-a) address three-state after clkout1 low (hold mode, see note 9) 20 2 ns t d(hh-ah) hold high to holda high 25 ns t en(a-c1l) address driven before clkout1 low (hold mode, see note 9) 8 2 ns 2 value derived from characterization data and not tested. notes: 3. q = 1/4t c(c) . 9. a15-a0, ps , ds , is , strb , and r/w timings are all included in timings referenced as aaddress.o timing requirements over recommended operating conditions (see note 3) min nom max unit t d(c2h-h) hold valid after clkout2 high q 24 ns note 3: q = 1/4t c(c) . advance information
tms320c25, tms320e25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 32 serial port timing switching characteristics over recommended operating conditions (see note 3) parameter min typ max unit t d(ch-dx) dx valid after clkx rising edge (see note 10) 75 ns t d(fl-dx) dx valid after fsx falling edge (txm = 0, see note 10) 40 ns t d(ch-fs) fsx valid after clkx rising edge (txm = 1) 40 ns notes: 3. q = 1/4t c(c) . 10. the last occurrence of fsx falling and clkx rising. timing requirements over recommended operating conditions (see note 3) min nom max unit t c(sck) serial port clock (clkx/clkr) cycle time 2 200 ns t f(sck) serial port clock (clkx/clkr) fall time 25 3 ns t r(sck) serial port clock (clkx/clkr) rise time 25 3 ns t w(sck) serial port clock (clkx/clkr) low pulse duration (see note 11) 80 ns t w(sck) serial port clock (clkx/clkr) high pulse duration (see note 11) 80 ns t su(fs) fsx/fsr setup time before clkx/clkr falling edge (txm = 0) 18 ns t h(fs) fsx/fsr hold time after clkx/clkr falling edge (txm = 0) 20 ns t su(dr) dr setup time before clkr falling edge 10 ns t h(dr) dr hold time after clkr falling edge 20 ns 2 the serial port was tested at a minimum frequency of 1.25 mhz. however, the serial port was fully static but will properly func tion down to f sx = 0 hz. 3 value derived from characterization data and not tested. notes: 3. q = 1/4t c(c) . 11. the duty cycle of the serial port clock must be within 40-60%. advance information
tms320e25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 33 eprom programming absolute maximum ratings over specified temperature range (unless otherwise noted) 2 supply voltage range, v pp 3 0.6 v to 15 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . input voltage range on pins 24 and 25 0.3 v to 15 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 stresses beyond those listed under aabsolute maximum ratingso may cause permanent damage to the device. this is a stress rating only, and functional operation of the device at these or any other conditions beyond those indicated in the arecommended operating condit ionso section of this specification is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliabi lity. 3 all voltage values are with respect to gnd. recommended operating conditions min nom max unit v cc programming mode supply voltage (see note 13) 6 v v cc read mode supply voltage 4.75 5 5.25 v v pp programming mode supply voltage 12 12.5 13 v v pp read mode supply voltage (see note 12) v cc v notes: 12. v pp can be connected to v cc directly (except in the program mode). v cc supply current in this case would be i cc + i pp . during programming, v pp must be maintained at 12.5 v ( 0.25 v). 13. v cc must be applied before or at the same time as v pp and removed after or at the same time as v pp . this device must not be inserted into or removed from the board when v pp or v cc is applied. electrical characteristics over specified temperature range (unless otherwise noted) parameter test conditions min typ max unit i pp1 v pp supply current v pp = v cc = 5.25 v 100 m a i pp2 v pp supply current (during program pulse) v pp = 13 v 30 50 ma all typical values for i cc are at v cc = 5 v, t a = 25 c. recommended timing requirements for programming, t a = 25 c, v cc = 6 v, v pp = 12.5 v (see notes 14 and 15) min nom max unit t w(ipgm) initial program pulse duration 0.95 1 1.05 ms t w(fpgm) final pulse duration 2.85 78.75 ms t su(a) address setup time 2 m s t su(e) e setup time 2 m s t su(g) g setup time 2 m s t dis(g) output disable time from g 0 130? ns t en(g) output enable time from g 150? ns t su(d) data setup time 2 m s t su(vpp) v pp setup time 2 m s t su(vcc) v cc setup time 2 m s t h(a) address hold time 0 m s t h(d) data hold time 2 m s ? value derived from characterization data and not tested. notes: 14. for all switching characteristics and timing measurements, input pulse levels are 0.4 v to 2.4 v and v pp = 12.5 v 0.5 v during programming. 15. common test conditions apply for t dis(g) except during programming. advance information
i cc t a = 0 c, v cc = max, f x = max ma supply current tms320c25-50 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 34 absolute maximum ratings over specified temperature range (unless otherwise noted) 2 supply voltage range, v cc 3 0.3 v to 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . input voltage range 0.3 v to 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . output voltage range 0.3 v to 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . continuous power dissipation 1.5 w . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . operating free-air temperature range 0 c to 70 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . storage temperature range 55 c to 150 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 stresses beyond those listed under aabsolute maximum ratingso may cause permanent damage to the device. this is a stress rating only, and functional operation of the device at these or any other conditions beyond those indicated in the arecommended operating condit ionso section of this specification is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliabi lity. 3 all voltage values are with respect to v ss . recommended operating conditions min nom max unit v cc supply voltage 4.75 5 5.25 v v ss supply voltage 0 v int0 -int2 2.5 v v ih high-level input voltage clkin, clkx, clkr 3.5 v other inputs 2.35 v mp/mc 0.8 v v il low-level input voltage clkin 0.8 v other inputs 0.8 v i oh high-level output current 300 m a i ol low-level output current 2 ma t a operating free-air temperature 0 70 c electrical characteristics over specified free-air temperature range (unless otherwise noted) parameter test conditions min typ max unit v oh high-level output voltage v cc = min, i oh = max 2.4 v v ol low-level output voltage v cc = min, i ol = max 0.6 v i z high-impedance current v cc = max 20 20 m a i i input current v i = v ss to v cc 10 10 m a normal 110 185 idle, hold 50 100 c i input capacitance 15 pf c o output capacitance 15 pf all typical values are at v cc = 5 v, t a = 25 c. advance information
tms320c25-50 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 35 clock characteristics and timing the tms320c25-50 can use either its internal oscillator or an external frequency source for a clock. internal clock option the internal oscillator is enabled by connecting a crystal across x1 and x2, clkin. the frequency of clkout1 is one-fourth the crystal fundamental frequency. the crystal should be in either fundamental or overtone mode, and parallel resonant, with an effective series resistance of 30 w , a power dissipation of 1 mw, and be specified at a load capacitance of 20 pf. note that overtone crystals require an additional tuned lc circuit. parameter test conditions min typ 2 max unit f x input clock frequency t a = 0 c to 70 c 6.7 51.2 mhz f sx serial port frequency t a = 0 c to 70 c 0 6.4 mhz c1, c2 t a = 0 c to 70 c 10 pf 2 the serial port was tested at a minimum frequency of 1.25 mhz. however, the serial port was fully static but will properly func tion down to f sx = 0 hz. x2/clkin c2 c1 x1 crystal figure 6. internal clock option external clock option an external frequency source can be used by injecting the frequency directly into x2/clk, with x1 left unconnected. the external frequency injected must conform to specifications listed in the following table. switching characteristics over recommended operating conditions (see note 3) min nom max unit t c(c) clkout1, clkout2 cycle time 78.13 597 ns t d(cih-c) clkin high to clkout1, clkout2, strb high, low 12 27 ns t f(c) clkout1, clkout2, strb fall time 4 ns t r(c) clkout1, clkout2, strb rise time 4 ns t w(cl) clkout1, clkout2, strb low pulse duration 2q 7 2q + 3 ns t w(ch) clkout1, clkout2, strb high pulse duration 2q 3 2q + 7 ns t d(c1-c2) clkout1 high to clkout2 low, clkout2 high to clkout1 high, etc. q 6 q + 2 ns note 3: q = 1/4 t c(c) advance information
tms320c25-50 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 36 +5 v f crystal 4.7 k w 10 k w 74hc04 f11 clkin 47 pf 74as04 10 k w c = 20 pf 0.1 m f l tms320c25 tms320c25 tms320c25-50 tms320e25 40.96 51.20 40.96 1.8 1.0 1.8 f crystal, (mhz) l, ( m h) figure 7. external clock option timing requirements over recommended operating conditions (see note 3) min nom max unit t c(ci) clkin cycle time 19.5 3 150 ns t f(ci) clkin fall time 5 2 ns t r(ci) clkin rise time 5 2 ns t w(cil) clkin low pulse duration, t c(ci) = 50 ns (see note 4) 20 ns t w(cih) clkin high pulse duration, t c(ci) = 50 ns (see note 4) 20 ns t su(s) sync setup time before clkin low 4 q 4 ns t h(s) sync hold time from clkin low 4 ns 2 value derived from characterization data and not tested. notes: 3. q = 1/4 t c(c) 4. clkin duty cycle [t r(ci) + t w(cih) ]/t c(ci) must be within 40-60%. advance information
tms320c25-50 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 37 memory and peripheral interface timing switching characteristics over recommended operating conditions (see note 3) parameter min typ max unit t d(c1-s) strb from clkout (if strb is present) q 5 q + 3 ns t d(c2-s) clkout2 to strb (if strb is present) 2 5 ns t su(a) address setup time before strb low (see note 5) q 11 ns t n(a) address hold time after strb high (see note 5) q 4 ns t w(sl) strb low pulse duration (no wait states, see note 6) 2q 5 2q + 2 ns t w(sh) strb high pulse duration (between consecutive cycles, see note 6) 2q 2 2q + 5 2 ns t su(d)w data write setup time before strb high (no wait) 2q 17 ns t h(d)w data write hold time from strb high q 5 ns t en(d) data bus starts being driven after strb low (write) 0 2 ns t dis(d) data bus high-impedance state after strb high, (write) q q + 15 2 ns t d(msc) msc valid from clkout1 1 9 ns 2 value derived from characterization data and not tested. notes: 3. q = 1/4 t c(c) 5. a15-a0, ps , ds , is , r/w , and br timings are all included in timings referenced as aaddresso. 6. delay between clkout1, clkout2, and strb edges track each other, resulting in t w(sl) and t w(sh) being 2q with no wait states. timing requirements over recommended operating conditions (see note 3) min nom max unit t a(a) read data access time from address time (see notes 5 and 7) 3q 30 ns t su(d)r data read setup time before strb high 19 ns t h(d)r data read hold time from strb high 0 ns t d(sl-r) ready valid after strb low (no wait states) q 21 ns t d(c2h-r) ready valid after clkout2 high q 21 ns t h(sl-r) ready hold time after strb low (no wait states) q 1 ns t h(c2h-r) ready valid after clkout2 high q 1 ns t d(m-r) ready valid after msc valid 2q 24 ns t h(m-r) ready hold time after msc valid 0 ns notes: 3. q = 1/4 t c(c) 5. a15-a0, ps , ds , is , r/w , and br timings are all included in timings referenced as aaddresso. 7. read data access time is defined as t a(a) = t su(a) + t w(sl) t su(d)r . advance information
tms320c25-50 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 38 rs , int , bio , and xf timing switching characteristics over recommended operating conditions (see notes 3 and 16) parameter min typ max unit t d(rs) clkout1 low to reset state entered 22 2 ns t d(iack) clkout1 to iack valid 5 7 ns t d(xf) xf valid before falling edge of strb q 8 ns 2 value derived from characterization data and not tested. notes: 3. q = 1/4 t c(c) 16. rs , int , bio are asynchronous inputs and can occur at any time during a clock cycle. timing requirements over recommended operating conditions (see notes 3 and 16) min nom max unit t su(in) int , bio , rs setup before clkout1 high 25 ns t h(in) int , bio , rs hold after clkout1 high 0 ns t f(in) int , bio fall time 8 2 ns t w(in) int , bio low pulse duration t c(c) ns t w(rs) rs low pulse duration 3t c(c) ns 2 value derived from characterization data and not tested. notes: 3. q = 1/4 t c(c) 16. rs , int , bio are asynchronous inputs and can occur at any time during a clock cycle. hold timing switching characteristics over recommended operating conditions (see note 3) parameter min typ max unit t d(cil-al) holda low after clkout1 low 1 2 11 ns t dis(al-a) holda low to address high-impedance 0 2 ns t dis(cil-a) address high-impedance after clkout1 low (hold mode, see note 17) 20 2 ns t d(hh-ah) hold high to holda high 19 ns t en(a-cil) address driven before clkout1 low (hold mode, see note 17) 8 2 ns 2 value derived from characterization data and not tested. notes: 3. q = 1/4 t c(c) 17. a15-a0, ps , ds , strb , and r/w timings are all included in timings referenced as aaddresso. timing requirements over recommended operating conditions (see note 3) min nom max unit t d(c2h-h) hold valid after clkout2 high q 19 ns note 3: q = 1/4 t c(c) advance information
parameter unit tms320c25-50 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 39 serial port timing switching characteristics over recommended operating conditions (see note 3) parameter min typ max unit t d(ch-dx) dx valid after clkx rising edge (see note 18) 75 ns t d(fl-dx) dx valid after falling edge (txm = 0, see note 18) 40 ns t d(ch-fs) fsx valid after clkx raising edge (txm = 1) 40 ns notes: 3. q = 1/4 t c(c) 18. the last occurrence of fsx falling and clkx rising. timing requirements over recommended operating conditions (see note 3) min nom max unit t c(sck) serial port clock (clkx/clkr) cycle time 2 160 ns t f(sck) serial port clock (clkx/clkr) fall time 25 3 ns t r(sck) serial port clock (clkx/clkr) rise time 25 3 ns t w(sck) serial port clock (clkx/clkr) low or high pulse duration (see note 19) 64 ns t su(fs) fsx or fsr setup time before clkx, clkr falling edge (txm = 0) 5 ns t h(fs) fsx or fsr hold time before clkx, clkr falling edge (txm = 0) 10 ns t su(dr) dr setup time before clkr falling edge 5 ns t h(dr) dr hold time after clkr falling edge 10 ns 2 the serial port was tested at a minimum frequency of 1.25 mhz. however, the serial port was fully static but will properly func tion down to f sx = 0 hz. 3 value derived from characterization data and not tested. notes: 3. q = 1/4 t c(c) 19. the cycle of the serial port must be within 40%-60%. contrast summary of electrical specifications the following table presents electrical parameters which differ between tms320c25 (40 mhz, 100 ns) and tms320c25-50 (50 mhz, 80 ns). clock characteristics and timing tms320c25 tms320c25-50 min typ max min typ max t c(sck) 97.7 597 78.13 597 ns t d(cih-c) 5 30 12 27 ns t f(c) 5 4 ns t r(c) 5 4 ns t w(cl) 2q 8 2q 2q + 8 2q 7 2q + 3 ns t w(ch) 2q 8 2q 2q + 8 2q 3 2q + 7 ns t d(c1-c2) q 5 q q + 5 q 6 q + 2 ns t su(s) 5 q 5 4 q 4 ns t h(s) 8 4 ns advance information
parameter unit parameter unit parameter unit parameter unit tms320c25-50 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 40 memory and peripheral interface timing tms320c25 tms320c25-50 min typ max min typ max t d(c1-s) q 6 q q+6 q 5 q + 3 ns t d(c2-s) 6 0 6 2 5 ns t su(a) q 12 q 11 ns t h(a) q 8 q 4 ns t w(sl) 2q 2q 5 2q + 2 ns t w(sh) 2q 2q 2 2q + 5 ns t su(d)w 2q 20 2q 17 ns t h(d)w q 10 q q 5 ns t d(msc) 12 0 12 1 9 ns t a(a) 3q 35 3q 30 ns t su(d)r 23 19 ns t h(d)r 0 0 ns t d(sl-r) q 20 q 21 ns t d(c2h-r) q 20 q 21 ns t h(sl-r) q + 3 q 1 ns t h(c2h-r) q + 3 q 1 ns t d(m-r) 2q 25 2q 24 ns t h(m-r) 0 0 ns rs , int , bio , and xf timing tms320c25 tms320c25-50 min typ max min typ max t d(iack) 6 0 12 5 7 ns t d(xf) q 15 q 8 ns t su(in) 32 25 ns t h(in) 0 0 ns hold timing tms320c25 tms320c25-50 min typ max min typ max t d(c1l-al) 0 10 1 11 ns t d(hh-ah) 25 19 ns t d(c2h-h) q 24 q 19 ns serial port timing tms320c25 tms320c25-50 min typ max min typ max t d(ch-dx) 75 70 ns t d(fl-dx) 40 40 ns t d(ch-fs) 40 40 ns t su(fs) 18 5 ns t h(fs) 20 10 ns t su(dr) 10 5 ns t h(dr) 20 10 ns advance information
tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 41 timing diagrams this section contains all the timing diagrams for the tms320 second-generation devices. refer to the top corner of page for the specific device. timing measurements are referenced to and from a low voltage of 0.8 voltage and a high voltage of 2 volts, unless otherwise noted. clock timing x/2clkin sync clkout1 strb clkout2 t c(ci) t f(ci) t r(ci) t w(cih) t w(cil) t h(s) t su(s) t d(cih-c) t d(cih-c) t w(cl) t c(c) t w(ch) t f(c) t r(c) t d(cih-c) t c(c) t w(cl) t r(c) t f(c) t w(ch) t d(c1-c2) t d(cih-c) t d(c1-c2) t d(c1-c2) t d(c1-c2) t su(s) advance information
tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 42 memory read timing clkout1 clkout2 strb a15-a0, br , ps , ds or is r/w ready d15-d0 t d(c1-s) t d(c1-s) t d(c2-s) t d(c2-s) t su(a) t w(sl) t h(a) t w(sh) t d(sl-r) t su(d)r t h(sl-r) t h(d)r data in valid t a(a) advance information
tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 43 memory write timing clkout1 clkout2 strb a15-a0, br , ps , ds or is r/w ready d15-d0 valid data out t su(a) t h(a) t su(d)w t dis(d) t en(d) t h(d)w advance information
tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 44 one wait-state memory access timing clkout1 clkout2 strb a15-a0, br , ps , ds , r/w or is msc ready d15-d0 (for read operation) data in data out t h(c2h-r) valid d15-d0 (for write operation) t d(c2h-r) t d(m-r) t h(m-r) t d(m-r) t d(msc) t d(msc) t h(c2h-r) t d(c2h-r) t h(m-r) advance information
tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 45 reset timing clkout1 rs a15-a0 d15-d0 ps strb control signals 2 iack serial port control 3 fetch location 0 begin program execution valid valid t d(rs) t su(in) t h(in) t su(in) t w(rs) 2 control signals are ds , is , r/w , and xf. 3 serial port controls are dx and fsx. advance information
tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 46 interrupt timing (tms32020) clkout1 strb int2 -int0 a15-a0 iack fetch n fetch n + 1 fetch i fetch i + 1 t su(in) t h(in) t w(in) t d(iack) t f(in) t d(iack) interrupt timing (tms320c25) clkout1 strb int2 -int0 a15-a0 iack fetch n fetch n + 1 fetch n + 2 n + 3 t su(in) t h(in) t w(in) t d(iack) t f(in) t d(iack) fetch i advance information
tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 47 serial port receive timing t c(sck) t w(sck) t w(sck) t f(sck) t h(dr) t h(fs) t su(dr) t su(fs) clkr fsr dr t r(sck) serial port transmit timing clkx fsx (input, txm = 0) dx fsx (output, txm = 1) t c(sck) t r(sck) t w(sck) t f(sck) t w(sck) t d(ch-dx) t h(fs) t d(fl-dx) t d(ch-dx) t su(fs) t d(ch-fs) t d(ch-fs) n = 1 n = 8,16 advance information
tms32020 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 48 bio timing clkout1 strb a15-a0 bio fetch bioz t su(in) t h(in) fetch branch address fetch next instruction pc = npc = n + 1pc = n + 2pc = n + 3 or branch address valid external flag timing clkout1 strb a15-a0 xf t d(xf) pc = n 1pc = npc = n + 1pc = n + 2 valid fetch sxf/rxf valid valid valid advance information
tms320c25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 49 bio timing clkout1 strb a15-a0 bio fetch bioz t su(in) t h(in) fetch next instruction pc = npc = n + 1pc = n + 2 or branch address valid fetch branch address external flag timing clkout1 strb a15-a0 xf t d(xf) pc = npc = n + 1pc = n + 2pc = n + 3 valid fetch sxf/rxf valid valid valid advance information
tms32020 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 50 hold timing (part a) clkout1 clkout2 strb hold a15-a0 ps , ds , or is r/w d15-d0 holda fetch execute t d(c2h-h) 2 t dis(c1l-a) t dis(al-a) t d(c1l-al) in in n n + 1 n + 2 valid valid n n + 1 n/a n/a n 1 n dummy dead 2 hold is an asynchronous input and can occur at any time during a clock cycle. if the specified timing is met, the exact sequence sh own will occur; otherwise, a delay of one clkout2 cycle will occur. advance information
tms32020 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 51 hold timing (part b) clkout1 clkout2 strb hold a15-a0 ps , ds , or is r/w d15-d0 holda fetch execute t d(c2h-h) 2 in in n + 2 n + 3 valid valid n/a n /a n + 2 n + 3 dead dead n + 1 n + 2 t en(a-c1l) t d(hh-ah) 2 hold is an asynchronous input and can occur at any time during a clock cycle. if the specified timing is met, the exact sequence sh own will occur; otherwise, a delay of one clkout2 cycle will occur. advance information
tms320c25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 52 hold timing (part a) clkout1 clkout2 strb hold a15-a0 ps , ds , or is r/w d15-d0 holda fetch execute t d(c2h-h) 2 t dis(c1l-a) t dis(al-a) t d(c1l-al) in in n n + 1 n + 2 valid valid n n + 1 n 2 n 1 n 2 hold is an asynchronous input and can occur at any time during a clock cycle. if the specified timing is met, the exact sequence sh own will occur; otherwise, a delay of one clkout2 cycle will occur. advance information
tms320c25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 53 hold timing (part b) clkout1 clkout2 strb hold ps , ds , or is r/w d15-d0 holda a15-a0 fetch execute t d(c2h-h) 2 in n + 2 n + 2 valid n + 2 n + 1 t en(a-c1l) t d(hh-ah) 2 hold is an asynchronous input and can occur at any time during a clock cycle. if the specified timing is met, the exact sequence sh own will occur; otherwise, a delay of one clkout2 cycle will occur. advance information
tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 54 typical supply current characteristics for tms320c25 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 10 20 4 8 12 16 20 24 28 32 36 40 44 48 52 t a = 25 c i cc vs f (clkin) and v cc normal operating mode f (clkin) , mhz v cc = 5.50 v v cc = 5.25 v v cc = 5.00 v v cc = 4.75 v v cc = 4.50 v i ma cc, 0 80 70 60 50 40 30 10 20 4 8 12 16 20 24 28 32 36 40 44 48 52 i cc vs f (clkin) and v cc powerdown mode f (clkin) , mhz i ma cc, v cc = 5.50 v v cc = 5.25 v v cc = 5.00 v v cc = 4.75 v v cc = 4.50 v tms320c25fnl (plcc) reflow soldering precautions recent tests have identified an industry-wide problem experienced by surface mounted devices exposed to reflow soldering temperatures. this problem involves a package cracking phenomenon sometimes experienced by large (e.g., 68-lead) plastic leaded chip carrier (plcc) packages during surface mount manufacturing. this phenomenon occur if the tms320c25fnl is exposed to uncontrolled levels of humidity prior to reflow solder. this moisture can flash to steam during solder reflow, causing sufficient stress to crack the package and compromise device integrity. if the tms320c25fnl is being socketed, no special handling precautions are required. in addition, once the device is soldered into the board, no special handling precautions are required. in order to minimize moisture absorption, ti ships the tms320c25fnl in adry packo shipping bags with a rh indicator card and moisture-absorbing desiccant. these moisture-barrier shipping bags will adequately block moisture transmission to allow shelf storage for 12 months from date of seal when stored at less than 60% relative humidity (rh) and less than 30 c. devices may be stored outside the sealed bags indefinitely if stored at less than 25% rh and 30 c. once the bag seal is broken, the devices should be stored at less than 60% rh and 30 c as well as reflow soldered within two days of removal. in the event that either of the above conditions is not met, ti recommends these devices be baked in a clean oven at 125 c and 10% maximum rh for 24 hours. this restores the devices to their adry packedo moisture level. note shipping tubes will not withstand the 125 c baking process. devices should be transferred to a metal tray or tube be- fore baking. standard esd precautions should be followed. in addition, ti recommends that the reflow process not exceed two solder cycles and the temperature not exceed 220 c. if you have any additional questions or concerns, please contact your local ti representative. advance information
tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 55 mechanical data 68-pin gb grid array ceramic package (tms32020, tms320c25) all linear dimensions are in millimeters and parenthetically in inches 28,448 (1.120) 27,432 (1.080) 4,953 (0.195) 2,032 (0.080) 3,302 (0.130) 2,794 (0.110) 0,508 (0.020) 0,406 (0.016) 1,575 (0.062) 1,473 (0.058) dia 2,54 (0.100) t. p. 2,54 (0.100) t. p. 1,524 (0.060) nom 4 places 1,27 (0.050) nom 1,397 (0.055) max 17,02 (0.670) nom 17,02 (0.670) nom 28,448 (1.120) 27,432 (1.080) r q ja junction-to-free-air thermal resistance 36 c/w r q jc junction-to-case thermal resistance 6 c/w parameter max unit thermal resistance characteristics l k j h g f e d c b a 1234567891011 advance information
tms320c25 tms320c25-50 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 56 68-lead plastic leaded chip carrier package (tms320c25 and tms320c25-50) all linear dimensions are in millimeters and parenthetically in inches 25,27 (0.995) 25,02 (0.985) 24,33 (0.956) 24,13 (0.950) 0,81 (0.032) 0,66 (0.026) 0,51 (0.020) 0,36 (0.014) 1,52 (0.060) min 0,64 (0.025) min 4,50 (0.177) 4,24 (0.167) 2,79 (0.110) 2,41 (0.095) 1,27 (0.050) t.p. (see note b) 0,25 (0.010) r max 3 places (see note a) 25,27 (0.995) 25,02 (0.985) 24,33 (0.956) 24,13 (0.950) (see note a) 23,62 (0.930) 23,11 (0.910) (at seating plane) 1,35 (0.053) 1,19 (0.047) r q ja junction-to-free-air thermal resistance 46 c/w r q jc junction-to-case thermal resistance 11 c/w parameter max unit thermal resistance characteristics seating plane lead detail 1,22 (0.048) 1,07 (0.042) 45 45 0,94 (0.037) 0,69 (0.027) r notes: a. centerline of center pin, each side, is within 0,10 (0.004) of package centerline as determined by this dimension. b. location of each pin is within 0,127 (0.005) of true position with respect to center pin on each side. warning when reflow soldering is required, refer to page 54 for special handling instructions. advance information
all linear dimensions are in millimeters and parenthetically in inches r q ja junction-to-free-air thermal resistance 49 c/w r q jc junction-to-case thermal resistance 8 c/w parameter max unit thermal resistance characteristics (see note 1) a (see note 2) b b a (see note 2) 1,02 (0.040) 45 0,64 (0.025) r max 3 places 1,27 (0.050) typ (see note 3) c (at seating plane) 3,05 (0.120) 2,29 (0.090) 4,57 (0.180) 3,94 (0.155) 3,55 (0.140) 3,05 (0.120) 0,51 (0.020) 0,36 (0.014) 0,81 (0.032) 0,66 (0.026) 1,016 (0.040) min ref seating plane (see note 4) jedec outline no. of terminals tms320e25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 57 mechanical data 68-lead fz cer-quad, ceramic leaded chip carrier package (tms320e25 only) this hermetically-sealed chip carrier package consists of a ceramic base, ceramic cap, and a 68-lead frame. hermetic sealing is accomplished with glass. the fz package is intended for both socket- or surface- mounting. having a sn/pb ratio of 60/40, the tin/lead-coated leads do not require special cleaning or processing when being surface-mounted. a b c min max min max min max mo-087aa 28 12,32 (0.485) 12,57 (0.465) 10,92 (0.430) 11,56 (0.455) 10,41 (0.410) 10,92 (0.430) mo-087ab 44 17,40 (0.685) 17,65 (0.695) 16,00 (0.630) 16,64 (0.655) 15,49 (0.610) 16,00 (0.630) 68 25,02 (0.985) 25,27 (0.995) 23,62 (0.930) 24,26 (0.955) 23,11 (0.910) 23,62 (0.930) notes: 1. glass is optional, and the diameter is dependent on device application. 2. centerline of center pin, each side, is within 0,10 (0.004) of package centerline as determined by dimension b. 3. location of each pin is within 0,127 (0.005) of true position with respect to center pin on each side. 4. the lead contact points are within 0,15 (0.006) of being planar. advance information
tms320e25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 58 programming the tms320e25 eprom cell the tms320e25 includes a 4k 16-bit eprom, implemented from an industry-standard eprom cell, to perform prototyping and early field testing and to achieve low-volume production. when used with a 4k-word masked-rom tms320c25, the tms320e25 yields a high-volume, low-cost production as a result of more migration paths for data. an eprom adapter socket (part # tmdx3270120), shown in figure 8, is available to provide 68-pin to 28-pin conversion for programming the tms320e25. figure 8. eprom adapter socket key features of the eprom cell include standard programming and verification. for security against copyright violations, the eprom cell features an internal protection mechanism to prevent proprietary code from being read. the protection feature can be used to protect reading the eprom contents. this section describes erasure, fast programming and verification, and eprom protection and verification. fast programming and verification the tms320e25 eprom cell is programmed using the same family and device codes as the tms27c64 8k 8-bit eprom. the tms27c64 eprom series are ultraviolet-light erasable, electrically programmable read-only memories, fabricated using hvcmos technology. the tms27c64 is pin-compatible with existing 28-pin roms and eproms. the tms320e25, like the tms27c64, operates from a single 5-v supply in the read mode; however, a 12.5-v supply is needed for programming. all programming signals are ttl level. for programming outside the system, existing eprom programmers can be used. locations may be programmed singly, in blocks, or at random. when programmed in blocks, the data is loaded into the eprom cell one byte at a time, the high byte first and the low byte second. advance information
pin nomenclature (tms320e25) tms320e25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 59 figure 9 shows the wiring conversion to program the tms320e25 using the 28-pin pinout of the tms27c64. the pin nomenclature table provides a description of the tms27c64 pins. the code to be programmed into the device should be serial mode. the tms320e25 uses 13 address lines to address the 4k-word memory in byte format. 10 11 12 13 14 15 16 17 18 19 20 21 22 23 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 9876543216867666564636261 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 28 27 26 25 24 23 22 21 20 19 18 17 16 15 v cc pgm ept a8 a9 a11 g a10 e q8 q7 q6 q5 q4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 v a12 a7 a6 a5 a4 a3 a2 a1 a0 q1 q2 q3 gnd pp tms27c64 tms320e25 68-pin (fz) 8 d7 d6 d5 d4 d3 d2 d1 d0 e 24 25 26 ept v pp a0 clkin tms27c64 v a1 a2 a3 a4 a5 a6 a7 a8 a9 a10 a11 a12 ss pgm g v cc 3.9 k rs signals i/o definition a12 (msb) - a0 (lsb) clin e ept g gnd pgm q8 (msb) - q1 (lsb) rs v cc v pp i i i i i i i i/o i i i on-chip eprom programming address lines clock oscillator input eprom chip select eprom test mode select eprom read/verify select ground eprom write/program select data lines for byte-wide programming of on-chip 8k bytes of eprom reset for initializing the device 5-v power supply 12.5-v power supply figure 9. tms320e25 eprom conversion to tms27c64 eprom pinout advance information
tms320e25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 60 table 5 shows the programming levels required for programming, verifying and reading the eprom cell. the paragraphs following the table describe the function of each programming level. table 5. tms320e25 programming mode levels signal name 2 tms320e25 pin tms27c64 pin program program verify program inhibit read output disable e 22 20 v il v il v ih v il v il g 42 22 v ih pulse x pulse v ih pgm 41 27 pulse v ih x v ih v ih v pp 25 1 v pp v pp v pp v cc v cc v cc 61,35 28 v cc + 1 v cc + 1 v cc + 1 v cc v cc v ss 27,44,10 14 v ss v ss v ss v ss v ss clkin 52 14 v ss v ss v ss v ss v ss rs 65 14 v ss v ss v ss v ss v ss ept 24 26 v ss v ss v ss v ss v ss q1-q8 18-11 11-13,15-19 d in q out hi-z q out hi-z a12-a10 40-38 2,23,21, addr addr x addr x a9-a7 37,36,34 24,25,3 addr addr x addr x a6 33 4 addr addr x addr x a5 32 5 addr addr x addr x a4 31 3 addr addr x addr x a3-a0 30-28,26 7-10 addr addr x addr x 2 in accordance with tms27c64. legend; v ih = ttl high level; v il = ttl low level; addr = byte address bit v pp = 12.5 v 0.5 v; v cc = 5 0.25 v; x = don't care pulse = low-going ttl level pulse; d in = byte to be programmed at addr q out = byte stored at addr; rbit = rom protect bit. erasure before programming, the device is erased by exposing the chip through the transparent lid to high-intensity ultraviolet light (wavelength 2537 ?). the recommended minimum exposure dose (uv-intensity exposure-time) is 15 w ? s/cm 2 . a typical 12 mw/cm 2 , filterless uv lamp will erase the device in 21 minutes. the lamp should be located approximately 2.5 cm above the chip during erasure. after erasure, all bits are in the high state. note that normal ambient light contains the correct wavelength for erasure. therefore, when using the tms320e25, the window should be covered with an opaque label. fast programming after erasure (all memory bits in the cell are logic one), logic zeroes are programmed into the desired locations. the fast programming algorithm, shown in figure 10, is normally used to program the entire eprom contents, although individual locations may be programmed separately. a programmed logic zero can be erased only by ultraviolet light. data is presented in parallel (eight bits) on pins q8-q1. once addresses and data are stable, pgm is pulsed. the programming mode is achieved when v pp = 12.5 v, pgm = v il , v cc = 6 v, g = v ih , and e = v il more than one tms320e25 can be programmed when the devices are connected in parallel. locations can be programmed in any order. programming uses two types of programming pulses: prime and final. the length of the prime pulse is 1 ms. after each prime pulse, the byte being programmed is verified. if correct data is read, the final programming pulse is applied; if correct data is not read, an additional 1-ms prime pulse is applied up to a maximum of 15 times. the final programming pulse is 4 ms times the number of prime programming pulses applied. this sequence of programming and verification is performed at v cc = 6 v, and v pp = 12.5 v. when the full fast programming routine is complete, all bits are verified with v cc = v pp = 5 v. advance information
tms320e25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 61 program verify programmed bits may be verified with v pp = 12.5 v when g = v il , e = v il , and pgm = v ih . figure 11 shows the timing for the program and verify operation. start address = first location v cc = 6 0.25 v v pp = 12.5 v 0.25 v x = 0 program one 1-ms pulse verify one byte program one pulse of 3x-ms duration last address? v cc = v pp = 5 v 0.25 v compare all bytes to original data device passed x = 25? device failed increment address no yes fail pass yes no fail pass increment x figure 10. fast programming flowchart advance information
tms320e25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 62 address stable address n + 1 data in stable data out valid hi-z program verify v ih v il v ih /v oh v il /v ol v pp v cc v cc + 1 v cc v ih v il v ih v il v ih v il a12-a0 q8-q1 v pp v cc e pgm g figure 11. fast programming timing program inhibit programming may be inhibited by maintaining a high level input on the e pin or pgm pin. read the eprom contents may be read independent of the programming cycle, provided the rbit (rom protect bit) has not been programmed. the read is accomplished by setting e to zero and pulsing g low. the contents of the eprom location selected by the value on the address inputs appear on q8-q1. output disable during the eprom programming process, the eprom data outputs may be disabled, if desired, by establishing the output disable state. this state is selected by setting the g and pgm pins high. while output disable is selected, q8-q1 are placed in the high-impedance state. rom protection and verification this section describes the code protection feature included in the eprom cell, which protects code against copyright violations. table 6 shows the programming levels required for protecting and verifying the eprom. the paragraphs following the table describe the protect and verify functions. advance information
tms320e25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 63 table 6. tms320e25 protect and verify eprom mode levels signal 2 tms320e25 pin tms27c64 pin rom protect protect verify e 22 20 v ih v il g 42 22 v ih v il pgm 41 27 v ih v ih v pp 25 1 v pp v cc v cc 61,35 28 v cc + 1 v cc v ss 10, 27, 44 14 v ss v ss clkin 52 14 v ss v ss rs 65 14 v ss v ss ept 24 26 v pp v pp q8-q1 18-11 11-13, 15-19 q8 = pulse q8 = rbit a12-a10 40-38 2, 23, 21, x x a9-a7 37, 36, 34 24, 25, 3 x x a6 33 4 x v il a5 32 5 x x a4 31 6 v ih x a3-a0 30-28, 26 7-10 x x 2 in accordance with tms27c64. legend; v ih = ttl high level; v il = ttl low level; v cc = 5 v 0.25 v v pp = 12.5 v 0.5 v; x = don't care pulse = low-going ttl level pulse; rbit = rom protect bit. eprom protect the eprom protect facility is used to completely disable reading of the eprom contents to guarantee security of propietary algorithms. this facility is implemented through a unique eprom cell called the rbit (eprom protect bit) cell. once the contents to be protected are programmed into the eprom, the rbit is programmed, disabling access to the eprom contents and disabling the microprocessor mode on the device. once programmed, the rbit can be cleared only by erasing the entire eprom array with ultraviolet light, thereby maintaining security of the propietary algorithm. programming the rbit is accomplished using the eprom protect cycle, which consists of setting the e , g , pgm , and a4 pins high, v pp and ept to 2.5 v 0.5 v, and pulsing q8 low. the complete sequence of operations involved in programming the rbit is shown in the flowchart of figure 12. the required setups in the figure are detailed in table 6. advance information
tms320e25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 64 start x = 0 verify rbit device passed x = 25? fail no pass eprom protect setup program one 1-ms pulse x = x + 1 protect verify setup device failed verify rbit protect verify setup program one pulse of 3x-ms duration eprom protect setup yes figure 12. eprom protect flowchart protect verify protect verify is used following the eprom protect to verify correct programming of the rbit (see figure 12). when using protect verify, q8 outputs the state of the rbit. when rbit = 1, the eprom is unprotected; when rbit = 0, the eprom is protected. the eprom protect and verify timings are shown in figure 13. advance information
tms320e25 sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 65 protect verify v pp v cc v ih /v oh v il /v ol v ih v il v ih v il v cc + 1 v cc v pp v ss v ih v il a4 q8 v pp v cc e g v ih v il v ih v il a6 ept pgm hi-z hi-z hi-z figure 13. eprom protect timing advance information
index tms320 second-generation devices sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 66 advance information
nil nil nil sprs010b e may 1987 e revised november 1990 post office box 1443 ? houston, texas 77001 67 accumulator 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . adapter socket 58 . . . . . . . . . . . . . . . . . . . . . . . . . . . . addressing modes 10 . . . . . . . . . . . . . . . . . . . . . . . . . alu 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . architecture 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . bit instruction 17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . block diagram 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . bulletin board service 18 . . . . . . . . . . . . . . . . . . . . . . clock tms32020 22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . tms320c25/e25 28, 29 . . . . . . . . . . . . . . . . . . . . . tms320c25-50 35, 36 . . . . . . . . . . . . . . . . . . . . . . description 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . development support 18, 19 . . . . . . . . . . . . . . . . . . . . direct addressing 10, 17 . . . . . . . . . . . . . . . . . . . . . . . dma documentation support 20 . . . . . . . . . . . . . . . . eprom protection/verification 58-65 . . . . . . . . . . . . external interface 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . flowcharts eprom protect 63 . . . . . . . . . . . . . . . . . . . . . . . . . fast 60, 61 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . hotline 18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . immediate addressing 10 . . . . . . . . . . . . . . . . . . . . . . indirect addressing 10, 17 . . . . . . . . . . . . . . . . . . . . . . instruction set 10-16 . . . . . . . . . . . . . . . . . . . . . . . . . . interrupts 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . introduction 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . key features tms320 family 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . tms32020 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . tms320c25/c25-50/e25 4 . . . . . . . . . . . . . . . . . . mechanical data tms32020 55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . tms320c25 55, 56 . . . . . . . . . . . . . . . . . . . . . . . . . tms320c25-50 56 . . . . . . . . . . . . . . . . . . . . . . . . . tms320e25 57 . . . . . . . . . . . . . . . . . . . . . . . . . . . . memory addressing modes 10, 17 . . . . . . . . . . . . . . . . . . . . control 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . maps 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . microcomputer/microprocessor mode multiplier 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . multiprocessing 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . operation conditions tms32020 17, 21 . . . . . . . . . . . . . . . . . . . . . . . . . . tms320c25 27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . tms320c25-50 34 . . . . . . . . . . . . . . . . . . . . . . . . . tms320e25 27, 33 . . . . . . . . . . . . . . . . . . . . . . . . . overflow 17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . overview tms320 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . specification 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . package types 1-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . pin assignments 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . pin nomenclature tms32020/c25/c25-50 2 . . . . . . . . . . . . . . . . . . . tms320e25 60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . pinouts tms32020/c25/c25-50 1 . . . . . . . . . . . . . . . . . . . tms320e25 60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . programming levels for eprom 58-65 . . . . . . . . . . repeat feature 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . reflow soldering precaution 54 . . . . . . . . . . . . . . . . . . serial port 7, 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . shifter 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . specification overview 20 . . . . . . . . . . . . . . . . . . . . . . subroutines 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . supply current characteristics 54 . . . . . . . . . . . . . . . . switching characteristics tms32020 21, 23-26 . . . . . . . . . . . . . . . . . . . . . . . tms320c25/e25 27, 28-33 . . . . . . . . . . . . . . . . . . tms320c25-50 34, 35-40 . . . . . . . . . . . . . . . . . . . timer 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . timing diagrams 41-53, 62, 65 . . . . . . . . . . . . . . . . . . tms320 second-generation 41-47 . . . . . . . . . . . tms32020 46, 48, 50, 51 . . . . . . . . . . . . . . . . . . . tms320c25/e25 46, 49, 52, 53 . . . . . . . . . . . . . . tms3220 product notification 17 . . . . . . . . . . . . .
important notice texas instruments and its subsidiaries (ti) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. all products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. ti warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with ti's standard warranty. testing and other quality control techniques are utilized to the extent ti deems necessary to support this warranty. specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. certain applications using semiconductor products may involve potential risks of death, personal injury, or severe property or environmental damage (acritical applicationso). ti semiconductor products are not designed, authorized, or warranted to be suitable for use in life-support devices or systems or other critical applications. inclusion of ti products in such applications is understood to be fully at the customer's risk. in order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. ti assumes no liability for applications assistance or customer product design. ti does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of ti covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. ti's publication of information regarding any third party's products or services does not constitute ti's approval, warranty or endorsement thereof. copyright ? 1998, texas instruments incorporated

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