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PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
PM5945
SONET ATM PHYSICAL INTERFACE BOARD
______________________________________________________________________________________________
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
CONTENTS OVERVIEW........................................................................................................................1 FUNCTIONAL DESCRIPTION.......................................................................................2 DAUGHTERBOARD REGISTERS ................................................................................8 INTERFACE DESCRIPTION..........................................................................................9 SUNI REGISTER ADDRESS MAP...............................................................................16 RECEIVE DROP SIDE TIMING......................................................................................18 TRANSMIT DROP SIDE TIMING...................................................................................20 CHARACTERISTICS.......................................................................................................22 MICROPROCESSOR INTERFACE TIMING CHARACTERISTICS.........................22 APPENDIX A: PAL EQUATIONS ..................................................................................A1 APPENDIX B: MECHANICAL DRAWINGS.................................................................B1 APPENDIX C: MATERIAL LIST.....................................................................................C1 APPENDIX D: COMPONENT PLACEMENT...............................................................D1 APPENDIX E: SCHEMATICS........................................................................................E1 APPENDIX F: LAYOUT NOTES....................................................................................F1 APPENDIX G: LAYOUT ..................................................................................................G1
______________________________________________________________________________________________ i
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
OVERVIEW The PM5945 SAPI daughter board contains the PMC PM5345 SUNI-155 (SATURN User Network Interface), the Cypress CY7B951 SONET/SDH Serial Transceiver (a clock and data recovery and clock synthesis unit), and optical PMD in a complete optical ATM (Asynchronous Transfer Mode) physical interface. The SUNI is an ATM physical layer processor for a SONET STS-3C transmission system. This daughter board has been designed to mate with National Semiconductor Corporation's Vicksburg EISA adapter motherboard to form a complete evaluation system. The SAPI daughter board is configured, monitored, and powered through a 100 pin edge connector that mates with the Vicksburg motherboard. The motherboard provides all of the software and decoding logic necessary to directly access all of the registers on the SAPI board. The SAPI line side interface uses any 9-pin duplex SC receptacle. The optical Transceiver PMD device runs at 155.52 MHz. On the receive side, the receive optical PMD connects to the clock and data recovery section of the Cypress SONET/SDH Serial Transceiver (CY7B951). The output of the CY7B951 is accoupled to the SUNI's bit serial input. On the transmit side, the SUNI's PECL data outputs connect directly to the Cypress CY7B951 serial input which buffers the data and outputs the data directly to the transmit optics. The CY7B951 can mux the output data to the input of the PLL and transfer back the recovered clock and data to the input of the SUNI for diagnostic purposes. The SAPI drop side interface uses a 100 pin edge connector. The 22V10 PLDs transform the SUNI drop side signals to comply with the UTOPIA like signals of the Vicksburg motherboard. The receive drop side also incorporates an additional FIFO, as the internal 4 cell FIFO of the SUNI device is insufficient to handle the latency time between burst cell reads by the R-FRED device on the Vicksburg motherboard.
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PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
FUNCTIONAL DESCRIPTION Block Diagram
UTOPIA Edge Connector Interface
Rx FIFO
Dropside FIFO interface
tx line bit serial
TXCI+ TXCITXD+ TXDPOCLK
LOS Generate CLK
PAL SUNI
RSER PICLK O I/O O PIN[7:0] TClk+ TClkTSer+ TSerGPIN /LFI RClk+ RClkI
SD
UTOPIA Interface
Optics
Tout+ Tout-
TXD+/-
/Loop
Tx+ TxRx+ Rx-
RXD+/-
rx line bit serial
RXC+ RXC-
Rin+
ID ROM
CY7B951
RXD+ RXDRSer+ RserRefClk+ RefClkRin-
19.44 MHz Osc
SUNI The SUNI is a monolithic integrated circuit that implements the SONET/SDH processing and ATM mapping functions of a 155 Mbit/s SONET STS-3c User Network Interface. It is the heart of the SAPI board; all traffic goes through the SUNI. On the line side, the SUNI transmits SONET frames through the line interface and receives frames from the line interface. On the drop side, the SUNI sinks cells provided by the buffer interface and sources cells to the buffer interface. Below, the SUNI is briefly described.
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PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
The SUNI receives SONET/SDH frames via a bit serial interface, and processes section, line, and path overhead. It performs framing (A1, A2), descrambling, detects alarm conditions, and monitors section, line, and path bit interleaved parity (B1, B2, B3), accumulating error counts at each level for performance monitoring purposes. Line and path far end block error indications (FEBE) are also accumulated. The SUNI interprets the received payload pointers (H1, H2) and extracts the synchronous payload envelope which carries the received ATM cell payload. The SUNI frames to the ATM payload using cell delineation. Header check sequence (HCS) error correction is provided. Idle/unassigned cells may be dropped according to a programmable filter. Cells are also dropped upon detection of an Uncorrectable HCS error. The ATM cell payloads are descrambled. The ATM cells that are passed are written to a four cell FIFO buffer. The received cells are read from the FIFO using a generic 8-bit wide datapath interface. Counts of received ATM cell headers that are erred and uncorrectable, and also those that are erred and correctable, are accumulated independently for performance monitoring purposes. The SUNI transmits SONET/SDH frames via a bit serial interface, and formats section, line, and path overhead bytes appropriately. It performs framing pattern insertion (A1, A2), scrambling, alarm signal insertion, and inserts section, line, and path bit interleaved parity (B1, B2, B3) as required to allow performance monitoring at the far end. Line and path far end block error indications (FEBE) are also inserted. The SUNI generates the payload pointer (H1, H2) and inserts the synchronous payload envelope which carries the ATM cell payload. The SUNI also supports the insertion of a large variety of errors into the transmit stream, such as framing pattern errors, bit interleaved parity errors, and illegal pointers, which are useful for system diagnostics and tester applications. Transmit ATM cells are written to an internal four cell FIFO using a generic 8-bit wide datapath interface. Idle/unassigned cells are automatically inserted when the internal FIFO contains less than one cell. The SUNI provides generation of the header check sequence and scrambles the payload of the ATM cells. Each of these transmit ATM cell processing functions can be enabled or bypassed. The SUNI is configured, controlled and monitored via the UTOPIA interface to the Vicksburg motherboard. For a complete description of the SUNI, please refer to PMC-Sierra's PM5345 datasheet.
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PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
CY7B951 The Cypress SONET/SDH Serial Transceiver is an integrated SONET clock and data recovery/clock synthesis device. The internal receive PLL recovers a 155.52 MHz clock from a incoming NRZ or NRZI data and re-times the data. The receive PLL uses the reference clock (19.44 MHz) to provide a 155.52 MHz clock in the absence of input data. The reference clock is also used to improve PLL lock time. The differential input data is re-timed by the recovered clock and presented as the PECL differential output data. The transmit section of the SONET/SDH Serial Transceiver contains a PLL that takes a reference clock and multiplies it by 8 to produce a 155.52 MHz PECL differential output clock. The transmit PECL differential input pair are used to buffer the transmit PECL output of the SUNI. This input can also be muxed into the receive side PLL for clock and data recovery (used for diagnostic purposes). Line Interface The receive line interface consists of receive optics connected to a clock and data recovery unit. To ensure that there is a clock in the absence of incoming light, the signal detect (SD) output of the optics is used to select between the serial and parallel mode of operation on the receive side of the SUNI device. In normal operation (good incoming signal) the SUNI device is in the serial mode and accepts clock and data from the high speed interface (RSER is high). In loss of signal condition, the SUNI device is switched to the parallel mode and accepts data from the PICLK and PIN[7:0] inputs. The POCLK is switched in to generate the 19.44 MHz PICLK. This technique also guarantees that the SUNI will generate a LOS indication when the optics loses incoming light. This is done due to the CY7B951 not squelching the data in a loss of signal condition. The transmit line interface consists of the SUNI PECL transmit outputs which are buffered by the Cypress CY7B951 and then fed directly to the transmit optics. Optical transceivers having a standard 9-pin duplex SC receptacle are used. The SUNI is configured for bit serial operation. The 155.52 MHz transmit clock source is synthesized by the CY7B951 from a 19.44 MHz oscillator. The receive clock and data recovery is supplied by the Cypress CY7B951 device. If the loop back select is enabled on the CY7B951 the transmit data is muxed in to the receive PLL and the recovered clock and data are fed back to the SUNI device. The SUNI can also be configured for loop time operation. When configured for loop time operation, only the receive clock and data are required.
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PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
UTOPIA Identification ROM The upper 32 bytes of the address space is used by the UTOPIA indentification ROM to hold the interface configuration information. Address 0x1C0-0x1DF 0x1E0 0x1E1 0x1E2-0x1E3 Function Reserved Protocol Type Media Type Capability Address 0x1E4-0x1EB 0x1EC-0x1EF 0x1F0-0x1FF Function 64 or 48-bit Address Reserved Manufacturer ID, Version
Protocol Type: Contains an identifier for the type of framing/protocol used on this PHY interface. The SAPI board has 0x0C programmed into this location which specifies 155.52 Mbps (SONET/OC-3) ATM Forum standard. The following values are defined: Value 0x00-0x03 0x04 0x05-0x07 0x08 0x09-0x0B 0x0C 0x0D 0x0E-0xFE 0xFF Reserved 44.736 Mbps (DS-3) ATM Forum Standard Reserved 100 Mbps (4B/5B block coded) ATM Forum Standard Reserved 155.52 Mbps (SONET/OC-3) ATM Forum Standard 155.52 Mbps (8B/10B block coded) ATM Forum Standard Reserved Undefined/Unidentified Protocol Type Framing Type
______________________________________________________________________________________________ 5
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
Media Type: Contains an identifier for the type of media used on this PHY interface. The SAPI board has 0x05 programmed into this location which specifies a low cost Multimode fiber (LCMF, 500m). The following values are defined: Value 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09-0x0B 0x0C 0x0D 0x0F Media Type Category 3 Unshielded Twisted Pair (CAT3-UTP) Category 5 Unshielded Twisted Pair (CAT5-UTP) Shielded Twisted Pair (STP) Reserved Very Low-Cost Multimode Fiber (VLCMF, 150 m) Low-Cost Multimode Fiber (LCMF, 500 m) Multimode Fiber (MF, 2km) Reserved Single Mode Fiber (SMF) Reserved Coaxial Cable (COAX) Reserved Undefined/Unidentified Media Type
Capability: Contains two octets which define the capability of the PHY interface. The SAPI board has 0x21 & 0x0C programmed into octets 1 & 2 respectively. The capabilities include: 1. TxRef, =1 when this interface supports the TxRefB UTOPIA signal. 2. RxRef, =1 when this interface supports the RxRefB UTOPIA signal. 3. TxClav, =1 when this interface supports the TxClav UTOPIA signal. 4. RxClav, =1 when this interface supports the RxClav UTOPIA signal.
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PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
5. TxXon, =1 when this interface supports the TxXon UTOPIA signal. 6. Ver[3:0], 4 bits UTOPIA version number, value for this specification =1. 7. D16, =1 to indicate 16-bit datapath, 0 = 8-bit datapath. 8. HEC, =1 to indicate the HEC is carried in the UDF(1) field. 9. HCS, =1 to indicate HCS is carried in the UDF(2) field, for 16-bit mode only. 10. NOTE "rsvd" stands for Reserved. Assignments of fields are shown below. rsvd rsvd HCS rsvd HEC rsvd D16 TxXon Ver[3] RxClav Ver[2] TxClav Ver[1] RxRef Ver[0] TxRef octet 1 octet 2
64 or 48-bit Address: Contains eight octets which define the 64 or 48-bit address of the PHY interface. If a 48-bit address is used, the 2 most significant octets are zero filled. The address is stored in Big-Endian format (MSB is in the LS address). The SAPI board has 0x00 programmed into this location. Reserved: Reserved for future expansion. Manufacturer ID, etc.: Contains sixteen octets which identify the manufacturer of the PHY interface. Using the ASCII character set (7-bit code) is encouraged. Three octets of ASCII representing the manufacture ID and 13 octets of part number.
M.S L.S 0 1 2 3 4 5 NUL SOH STX ETX EOT ENQ DLE DC1 DC2 DC3 DC4 NAK SP ! " # $ % 0 1 2 3 4 5 @ A B C D E P Q R S T U \ a b c d e p q r s t u 0 1 2 3 4 5 6 7
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PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
6 7 8 9 A B C D E F
ACK BEL BS HT LF VT FF CR SO SI
SYN ETB CAN EM SUM ESC FS GS RS S
& ' ( ) * + , . /
6 7 8 9 : ; < = > ?
F G H I J K L M N O
V W X Y Z [ \ ] ^ <-
f g h i j k l m n o
v w z y z
|
~ DEL
P 50
M 4d
C 43
2d
P 50
M 4d
5 35
9 39
4 34
5 35
2d
S 53
A 41
P 50
I 49 20
DAUGHTERBOARD REGISTERS The SAPI daughterboard has two write only register bits. One bit is a software reset bit and the other is a transmit loopbacd enable bit. Software Reset The software reset bit is at binary address 1110xxxxx (the most significant bit is at the far left and the least significant is at the far right). The least significant 5 bits of the address are don't cares. Writing a binary xxxxxxx1 to this address will hold the SUNI, the FIFO, and the PALs reset. Writing a binary xxxxxxx0 to this address will remove the reset. The most significant 7 bits of data are don't cares. This is a write only bit. A hardware reset removes the software reset. Transmit Loopback Enable The transmit loopback enable bit is at binary address 1111xxxxx (the most significant bit is at the far left and the least significant is at the far right). The least significant 5 bits of the address are don't cares. Writing a binary xxxxxxx1 to this address will mux the transmit output data going to the optics, into the inputs of the clock and data recovery PLL. This is all done inside the Cypress CY7B951 device.
______________________________________________________________________________________________ 8
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
This allows a diagnostic loopback to be done at the Cypress part which will verify the connections and functionality between the Cypress device and the SUNI device. done. Writing a binary xxxxxxx0 to this address will disable transmit diagnostic loopback. The most significant 7 bits of data are don't cares. This is a write only bit. A hardware reset removes the transmit loopback enable (if it was set).
INTERFACE DESCRIPTION UTOPIA Interface The UTOPIA Interface makes the SUNI drop side receive and transmit signals compatible with the UTOPIA 1.04 interface specification. It consists of two high speed 22V10 PALs, two high speed IDT74FCT377C buffers, and a receive IDT72201 clocked FIFO. The 22V10 PALs can be replaced with faster versions if you must run at a higher than 20 MHz TxClk and RxClk clock signals. The Transmit drop side interface is controlled by the ATM layer through the edge connector. All the transmit signals from the ATM layer change with respect to the TxClk. All the input signals to the ATM layer are sampled on the rising edge of the TxClk. The SUNI device asserts the TCA signal when it has a complete empty cell available. This signal goes to the PAL (U17) and causes the TxFullB signal to the ATM layer to be de-asserted (high). The ATM layer asserts the TxClavB signal (low) when it has a complete Cell of data to transfer to the PHY device. The TxEnbB signal from the ATM layer (Vicksburg card) is the output of the TxFullB signal from the PHY layer gated with the TxClavB signal from the ATM layer. The way the TxEnbB signal goes active (low) depends on whether the ATM layer is ready to send a cell of data before the PHY layer becomes available to accept the data, or whether the PHY layer is ready to accept a cell of data before the ATM layer is ready to send data. The case where the ATM layer has a cell available for transmission before the PHY layer is ready to accept the cell is handled as follows; The Vicksburg card drives the TSOC signal active (high) and the TxData bus with valid octet byte zero coincident with the assertion of the TxClavB signal, and waits for the TxFullB signal from the PHY layer to go inactive (high). When the PHY device has a cell available, the TxFullB signal goes inactive (high) and then the TxEnbB signal is immediately asserted (low) (after a delay through a gate). On the next rising edge of the TxClk signal, the second byte of data is driven onto the TxData bus and the TSOC signal is de-asserted (low). The case where the PHY layer is ready to accept a cell of data before the ATM layer is ready to transmit the cell is handled as follows; The PHY layer de-asserts the TxFullB signal (high) and waits for the TxEnbB signal to go active (low). When the
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PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
ATM layer has a cell available for transmission, the TxClavB is set active (low) on the rising edge of the TxClk signal, and drives the TSOC signal active (high) and the TxData bus with valid octet byte zero . The TxClavB signal sets the TxEnbB signal active (low) through a gate delay. In either case, the TxData bus is continually clocked into the first buffer (U18) by the rising edges of the TxClk signal. The assertion of the TxEnbB signal enables the TWRB signal to the SUNI device. On the falling edge of the TWRB signal (rising edge of TxClk) the data from U18 is clocked into the second buffer (U19). The clock signal to U19 is generated by the PAL (inverted TxClk). The ATM layer updates the TxData with new data on the rising edge of each TxClk signal while TxEnbB is asserted and the TxFullB signal is de-asserted (high). If at the end of the current cell transfer, another cell is available (TCA remains active), the TxFullB will still be asserted (low) on the 51'st byte transferred. This is to accomodate the propagation delay of TCA going inactive (low) at the end of a cell transfer and then being sampled by the PAL (TCA must be sampled as it can go active at any time). This will incur an extra clock delay per cell transfer. The TxClavB signal goes inactive (high) for a minimum of two cycles per cell trasfer. There will be a 3 clock cycle delay per cell transfer as the TxFullB and the TxClavB overlap. The Receive drop side interface is controlled by the ATM layer through the edge connector. All the receive signals from the ATM layer change with respect to the RxClk. All the input signals to the ATM layer are sampled on the rising edge of the RxClk. The receive side incorporates a external FIFO so that the SUNI device does not overrun due to the latency times between burst cell reads of the ATM layer (Vicksburg mother board). The SUNI device asserts the RCA signal when it has a complete cell to transfer to the FIFO. The RCA signal goes to the Receive PAL (U16) and the PAL asserts the write enables to the receive FIFO. If the receive FIFO is not full (/FF high), the receive PAL will start clocking the data from the SUNI into the FIFO by generating the RRDB clock signal. The RSOC signal from the SUNI is inserted into bit 9 of the FIFO data inputs. The FIFO enables the /FF (active low FIFO Full) signal when it is full which disables further transfer of data from the SUNI to the FIFO. If the FIFO gets full, the SUNI will have transferred an indeterminate portion of a cell. The rest of the cell will get transferred as soon as the FIFO de-activates the /FF signal. The Receive PAL uses the RxCLK signal from the ATM layer to generate the WClk signal going to the FIFO and the RRDB clock signal to the SUNI. The WEN going to the FIFO is disabled while the /FF is active (low). While the FIFO write enable is disabled, the clock going to the FIFO is the same as the RxCLK. This is done because the FIFO /FF signal will not be disabled (high) untill it gets a rising edge on the WCLK input. The RxEmptyB signal comes from the Receive FIFO /EF (active low Empty FIFO) signal. The Receive FIFO de-asserts the the RxEmptyB signal (high) upon reception of a single byte of data. On the next rising edge of the RxClk clock signal, the ATM layer samples the RxEmptyB signal and on the following RxClk clock signal, the ATM layer activates the RxEnbB signal (low) if it has an empty cell available. The
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PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
RxEnbB signal from the ATM layer goes to the Receive PAL (U16) and to the read enable (/RDEN1) input of the receive FIFO. On the next rising edge of the RxCLK signal after the RxEnbB signal goes active (low) the first byte of data is clocked out of the FIFO along with the RSOC signal. The receive ATM layer ignores the data until it sees a valid RSOC signal. Once cell transfer has commenced, the ATM layer expects a complete cell transfer. If the FIFO is empty (RxEmptyB is active) and then the SUNI starts to transfer data to the FIFO, there might only be one byte in the FIFO before the RxEmptyB signal could go inactive (high). For the FIFO to become empty, the SUNI must not have had any cells to transfer and therefore the first byte in the FIFO would be the first byte of the Cell along with the valid RSOC signal. Since the RxClk clock signal is generating the write and read clock signals to the FIFO as well as the read clock signal to the SUNI, the ATM layer cannot read the data out of the FIFO faster than the SUNI can write the data into the FIFO. SAPI Board Edge Connector Interface The SAPI UTOPIA Edge Connector Interface includes all the signals required to connect the SAPI board to a high layer protocol entity (i.e. a AAL processor). Cells can be written to the SUNI transmit FIFO and read from the SUNI receive FIFO using this interface. The edge connector is made up of a 100 pin dual line female connector is shown in table below. It consists of signals appropriate to read and write to the registers of the devices on the daughter board, and it provides the necessary power and ground. TTL signal levels are used on this interface.
S i g n al Name GND GND TxDat[0] TxDat[1] TxDat[2] TxDat[3] TxDat[4] TxDat[5] TxDat[6] TxDat[7] VCC VCC GND TxPrty
Type Power Power I I I I I I I I Power Power Power I
PIN 1 2 3 5 9 11 4 6 10 12 7 8 13 14
Function Ground Ground The SUNI is configured for the 8 bit FIFO interface, TxDat[7:0] corresponds to a cell byte. TxDat[7] corresponds to bit 1, the first bit received. TxDat[0] corresponds to bit 8, the last bit received.
+5 Volts +5 Volts Ground Transmit data bus (TxDat[7:0]) odd parity. Not Used
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PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
TxSOC GND GND TxFullB
I Power Power O
15 16 17 18
Transmit start of cell indication. Identifies the first byte (word) of a cell on inputs TxDAT[7:0] Ground Ground Active low signal from the PHY to ATM layer, asserted by the PHY layer 4 cycles before it is no longer able to accept transmit data. Active low signal from the ATM layer to the PHY layer, asserted by the ATM layer when it has a full cell to transmit. Ground Ground The transmit transfer/synchronization clock provided by the ATM to the PHY layer for synchronizing transfers on the TxDATA bus. (nominally at 20 MHz). Transmit Reference. Input for the purposes of synchronization (e.g. 8 KHz frame marker or SONET frame indicator). Not Used Ground Ground PHY layer flow control. 1= Xon, 0= Xoff. Asserted by the PHY layer for normal transmission. Deasserted by the PHY layer when the ATM link is experiencing congestion. The response of the ATM layer to this signal is user defined. Not Used. Active low transmit signal asserted by the ATM layer during cycles when the TxDat contains valid cell data. Ground Ground
TxClavB
I
19
GND GND TxCLK
Power Power I
20 21 22
TxRefB
I
23
GND GND TxXon
Power Power O
24 25 26
TxEnbB
27
GND GND
Power Power
28 29
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PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
RxDat[0] RxDat[1] RxDat[2] RxDat[3] RxDat[4] RxDat[5] RxDat[6] RxDat[7] RxPrty VCC VCC GND Undefined RxSOC GND GND RxEmptyB
O O O O O O O O O Power Power Power O Power Power 0
31 33 37 39 30 32 38 40 34 35 36 41 42 43 44 45 46
RxDat[7:0] corresponds to a cell byte. Please refer to the SUNI datasheet for the byte cell data structure. RxDat[7] corresponds to bit 1, the first bit received. RxDat[0] corresponds to bit 8, the last bit received.
Receive data bus (RxDat[7:0]) odd parity. Not Used +5 Volts +5 Volts Ground Receive start of cell indication. Identifies the first byte (word) of a cell on outputs RxDat[7:0] Ground Ground Active low empty signal to indicate that in the current cycle there is no valid data for delivery to the ATM layer. Active low signal asserted by the ATM layer to indicate that the RxDat[7:0] will be sampled at the start of the next cycle. Sampling occurs on cycles following those with RxENB asserted and RxEmptyB Deasserted. Ground Ground Transfer/synchronization clock provide by the ATM layer for synchronizing transfers on RxDat (nominally 20 MHz). Receive Reference. Output for the purposes of synchronization (e.g. 8 KHz frame marker or SONET frame indicator). Not Used. Ground Ground
RxEnbB
I
47
GND GND RxClk
Power Power I
48 49 50
RxRefB
O
51
GND GND
Power Power
52 53
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PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
RxClav
O
54
Receive Cell Available Signal. Active high signal from the PHY layer to the ATM layer, asserted to indicate that there is a complete cell available for transfer to the ATM layer. Not Used Ground Ground Address bus bit 7. Address bus bit 6. Address bus bit 5. Address bus bit 4. +5 Volts +5 Volts Address bus bit 3. Address bus bit 2. Address bus bit 1. Address bus bit 0. Ground Ground Data bus bit 0. Address bit used to read the Standard PHY registers. Data bus bit 1. Data bus bit 4. Ground Ground Data bus bit 2. Data bus bit 5. Data bus bit 3. Data bus bit 6.
RxFlush GND GND A[4] A[0] A[5] A[1] Undefined VCC VCC A[2] A[6] A[3] A[7] GND GND D[0] A[8] D[1] D[4] GND GND D[2] D[5] D[3] D[6] Power Power I I I I Power Power I/O I I/O I/O Power Power I/O I/O I/O I/O Power Power I I I I
55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
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PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
GND GND Prty D[7] VCC VCC Undefined INTB CSB GND GND RSTB RDB GND GND RDY WRB ALE GND GND
Power Power I/O I/O Power Power O I Power Power I I Power Power I I Power Power
81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
Ground Ground Data bus D[7:0] odd parity. Not Used. Data bus bit 7. +5 Volts +5 Volts Active low, open-drain interrupt signal. The SUNI active low chip select signal. Ground Ground Active low H/W reset. Active low read signal asserted to enable data from the addressed location onto the D[7:0] bus. Ground Ground Not Used Active low write signal asserted to write data to the addressed location from the D[7:0] bus. Address latch enable. When high, identifies that address is valid on D[7:0]. Not Used. Ground Ground
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PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
SUNI REGISTER ADDRESS MAP The microprocessor interface provides access to the SUNI device registers via the 100 pin UTOPIA connector. The SUNI address space extends from 00H to FFH. Address bit 8 (A8 being the most significant bit and A0 being the least signifcant bit) is set low to access the SUNI register space . Below is a list of the SUNI device registers. For further details, please refer to the "Saturn User Network Interface Device Datasheet". Address 0x00 0x01 0x02 0x04 0x05 0x06-0x07 0x08-0x0B 0x0C-0x0F 0x10 0x11 0x12 0x13 0x14 0x15 0x16-0x17 0x18 0x19 0x1A 0x1B 0x1C 0x1D 0x1E 0x1F 0x20 0x21 0x22-0x23 0x24-0x27 0x28-0x2B 0x2C-0x2F 0x30 0x31 0x32 0x33 Register SUNI Master Reset and Identity SUNI Master Configuration SUNI Master Interrupt Status SUNI Master Clock Monitor SUNI Master Control Reserved Reserved Reserved RSOP Control/Interrupt Enable RSOP Status/Interrupt Status RSOP Section BIP-8 LSB RSOP Section BIP-8 MSB TSOP Control TSOP Diagnostic TSOP Reserved RLOP Control/Status RLOP Interrupt Enable/Status RLOP Line BIP-24 LSB RLOP Line BIP-24 RLOP Line BIP-24 MSB RLOP Line FEBE LSB RLOP Line FEBE RLOP Line FEBE MSB TLOP Control TLOP Diagnostic TLOP Reserved Reserved Reserved Reserved RPOP Status/Control RPOP Interrupt Status RPOP Reserved RPOP Interrupt Enable
16
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PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
0x34 0x35 0x36 0x37 0x38 0x39 0x3A 0x3BH 0x3C-0x3F 0x40 0x41 0x42 0x43 0x44 0x45 0x46 0x47 0x48 0x49 0x4A 0x4B-0x4F 0x50 0x51 0x52 0x53 0x54 0x55 0x56-0x5F 0x60 0x61 0x62 0x63-0x67 0x68-0x7F 0x80 0x81-0xFF
RPOP Reserved RPOP Reserved RPOP Reserved RPOP Path Signal Label RPOP Path BIP-8 LSB / Load Meters RPOP Path BIP-8 MSB RPOP Path FEBE LSB RPOP Path FEBE MSB RPOP Reserved TPOP Control/Diagnostic TPOP Pointer Control TPOP Source Control TPOP Reserved TPOP Reserved TPOP Arbitrary Pointer LSB TPOP Arbitrary Pointer MSB TPOP Reserved TPOP Path Signal Label TPOP Path Status TPOP Reserved TPOP Reserved RACP Control/Status RACP Interrupt Enable/Status RACP Match Header Pattern RACP Match Header Mask RACP Correctable HCS Error Count RACP Uncorrectable HCS Error Count RACP Reserved TACP Control/Status TACP Idle/Unassigned Cell Header Pattern TACP Idle/Unassigned Cell Payload Octet Pattern TACP Reserved Reserved SUNI Master Test Reserved for Test
______________________________________________________________________________________________ 17
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
RECEIVE DROP SIDE TIMING Receive Functional Timing RxClk RxEmptyB RxEnbB RxSOC RxData X X X X H1 P48 X X X H1 H2
Receive Interface Timing Symbol Parameter RxClk Frequency (nominaly 20 MHz) RxClk Duty Cycle tSRxData tHRxData RxData[7:0] Set-up Time to RxClk RxData[7:0] Hold Time to RxClk 40 10 1 10 1 10 1 1 10 1 20 Min Max 20 60 Units MHz % ns ns ns ns ns ns ns ns ns
tSRxSOC RxSOC Set-up Time to RxClk tHRxSOC RxSOC Hold Time to RxClk
tSRxClavB RxClavB Set-up Time to RxClk tHRxClavB RxClavB Hold Time to RxClk tPRxEnbB RxClk high to RxEnbB Valid tSRxData tHRxData RxData[7:0] Set-up Time to RxClk RxData[7:0] Hold Time to RxClk
______________________________________________________________________________________________ 18
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
RxClk t S RxData RxData[7:0] t S RxSOC RxSOC t SRxClavB RxClavB t PRxEnbB RxEnbB t SRxEmptyB RxEmptyB tHRxEmptyB tHRxClavB tH RxSOC tH RxData
______________________________________________________________________________________________ 19
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
TRANSMIT DROP SIDE TIMING Transmit Functional Timing TxClk TxClavB TxEnbB TxFullB TxSOC TxData X
H1
H1
H2
P47
P48
X
X
X
H1
Transmit Interface Timing Symbol Parameter TxClk Frequency (nominaly 20 MHz) TxClk Duty Cycle tPTxData tPTxSOC TxClk high TxData[7:0] Valid TxClk high TxSOC Valid 40 1 1 1 1 1 10 1 Min Max 20 60 20 20 20 20 20 Units MHz % ns ns ns ns ns ns ns
tPTxClavB TxClk high TxClavB Valid tPTxData TxClk high TxData[7:0] Valid
tPTxEnbB TxClk high TxEnbB Valid tSTxFullB TxFullB Set-up Time to TxClk tHTxFullB TxFullB Hold Time to TxClk
______________________________________________________________________________________________ 20
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
TxClk tP TxData TxData[7:0] tP TxSOC TxSOC tP TxClavB TxClavB tP TxEnbB TxEnbB t S TxFullB TxFullB tH TxFullB
______________________________________________________________________________________________ 21
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
CHARACTERISTICS Symbol V5DC I5DC TA Parameter Min Max 5.25 1.00 0 50 Units Test Conditions V A C V5DC = 5.0 V + 5% VDC = 5.0 V + 5%
+5V DC Power 4.90 Supply Voltage +5V DC Power Supply Current Ambient Temperature
MICROPROCESSOR INTERFACE TIMING CHARACTERISTICS (T A = 0C to +70C, VD D = 5 V 10%) Microprocessor Interface Read Access (Fig. xx) Symbol tHAR tSAR tPRD tZRD tPINTH Parameter Address to Valid Read Hold Time Address to Valid Read Set-up Time Valid Read to Valid Data Propagation Delay Valid Read Negated to Output Tri-state Valid Read Deasserted to INTB High Min 20 25 80 20 50 Max Units ns ns ns ns ns
______________________________________________________________________________________________ 22
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
Microprocessor Interface Read Timing
A[8:0] tSAR
Valid Address
tHAR
(CSB+RDB) tP INTL INTB
tPRD D[7:0]
tZ RD
Valid Data
Notes on Microprocessor Interface Read Timing: 1. Output propagation delay time is the time in nanoseconds from the 50% point of the reference signal to the 30% or 70% point of the output. 2. A valid read cycle is defined as a logical OR of the CSB and the RDB signals. 3. When a set-up time is specified between an input and a clock, the set-up time is the time in nanoseconds from the 1.4 Volt point of the input to the 1.4 Volt point of the clock. 4. When a hold time is specified between an input and a clock, the hold time is the time in nanoseconds from the 1.4 Volt point of the input to the 1.4 Volt point of the clock.
______________________________________________________________________________________________ 23
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
Microprocessor Interface Write Access Symbol tSDW tSAW tHAW tSDW tHDW tVWR Parameter Data to Valid Write Set-up Time Address to Valid Write Set-up Time Address to Valid Write Hold Time Data to Valid Write Set-up Time Data to Valid Write Hold Time Valid Write Pulse Width Min 20 25 20 20 20 40 Max Units ns ns ns ns ns ns
Microprocessor Interface Write Timing A[8:0]
Valid Address
tSAW tVWR tH AW
(CSB+WRB) tS DW D[7:0] tH DW
Valid Data
Notes on Microprocessor Interface Write Timing: 1 A valid write cycle is defined as a logical OR of the CSB and the WRB signals. 2. Microprocessor Interface timing applies to normal mode register accesses only. 3. When a set-up time is specified between an input and a clock, the set-up time is the time in nanoseconds from the 1.4 Volt point of the input to the 1.4 Volt point of the clock. 4. When a hold time is specified between an input and a clock, the hold time is the time in nanoseconds from the 1.4 Volt point of the input to the 1.4 Volt point of the clock.
______________________________________________________________________________________________ 24
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
APPENDIX A: PAL EQUATIONS -- UTOPIA interface PAL U12 -- Used to generate the LOS and Chip Select Signals -- to the SUNI receive FIFOs USE work.bv_math.all; USE work.rtlpkg.all; USE work.cypres.all; -- necessary for inc_bv();
ENTITY los_cs_pal IS PORT (poclk0, poclk1, csb, rdb, wrb, a8, a6, a5, rstb, a7, d0, sd: IN BIT; rser, csbo, loopb, prom_enb, brstb : OUT BIT; piclk: INOUT x01z); ATTRIBUTE order_code of los_cs_pal:ENTITY is "PAL22V10D-10PC"; ATTRIBUTE part_name of los_cs_pal:ENTITY IS "C22V10"; ATTRIBUTE pin_numbers of los_cs_pal:ENTITY IS "poclk0:1 " & "poclk1:2 " & "csb:3 " & "wrb:4 " & "rdb:5 " & "a8:6 "& "a6:7 "& "a5:8 " & "rstb:9 " & "a7:10 " & "d0:11 " & "sd:13 " & "csbo:17 " & "loopb:18 " & "rser:19 " & "prom_enb:21 " & "brstb:22 " & "piclk:23"; END los_cs_pal; ARCHITECTURE behavior OF los_cs_pal IS SIGNAL set_reset,piclk_b,hold, grst,rser_din,oe_d: BIT; SIGNAL loopb_d,oe, loopb_en,loopb_dis,sd_sample: BIT; SIGNAL high :BIT := '1'; BEGIN
______________________________________________________________________________________________ A1
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
proc1:
PROCESS BEGIN WAIT UNTIL (poclk0 = '1'); -- Sample the SD input IF ( sd = '1' ) THEN sd_sample <= '1'; ELSE sd_sample <= '0'; END IF; -- Set RSER low if loss of signal occurs IF ( sd_sample = '1') THEN rser_din <= '1'; ELSE rser_din <= '0'; END IF; END process;
PROCESS BEGIN -- Enable PICLK IF ( rser_din = '0' AND sd_sample = '0' AND rstb ='1' and set_reset = '0') THEN oe <= '1'; ELSE oe <= '0'; END IF; -- Enable CSB IF ( csb = '0' AND a8 = '0' ) THEN csbo <= '0'; ELSE csbo <= '1'; END IF; -- Enable UTOPIA ID PROM IF ( csb = '0' AND a8 = '1' AND a7 = '1' AND a6 = '1' AND a5 = '1') THEN prom_enb <= '0'; ELSE prom_enb <= '1'; END IF; -- Set reset
______________________________________________________________________________________________ A2
proc2:
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
IF rstb = '0' THEN set_reset <= '0'; ELSIF (a8 = '1' AND a7 ='1' AND a6 = '1' AND a5 = '0' AND d0 = '1' AND csb = '0' AND wrb = '0') THEN set_reset <= '1'; -- Clear reset ELSIF (a8 = '1' AND a7 ='1' AND a6 = '1' AND a5 = '0' AND d0 = '0' AND csb = '0' AND wrb = '0') THEN set_reset <= '0'; END IF; -- BRSTB IF (rstb = '0' OR set_reset ='1') THEN brstb <= '0'; ELSIF (rstb = '1' and set_reset = '0' ) THEN brstb <= '1'; END IF; -- Disable LOOPB IF rstb = '0' OR (a8 = '1' AND a7 ='1' AND a6 = '1' AND a5 = '1' AND d0 = '0' AND csb = '0' AND wrb = '0') OR (a8 = '1' AND a7 ='1' AND a6 = '1' AND a5 = '0' AND d0 = '1' AND csb = '0' AND wrb = '0') THEN loopb_dis <= '1'; loopb_en <= '0'; -- Enable LOOPB ELSIF (rstb = '1' AND a8 = '1' AND a7 ='1' AND a6 = '1' AND a5 = '1' AND d0 = '1' AND csb = '0' AND wrb = '0') THEN loopb_en <= '1'; loopb_dis <= '0'; END IF; END process; b1:bufoe port map (poclk1,oe,piclk,piclk_b); b2:buf port map (rser_din,rser); b3:srl port map (loopb_dis,loopb_en,loopb); END behavior;
______________________________________________________________________________________________ A3
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
DESIGN EQUATIONS (06:44:11) These equations were extracted from the LOS_CS1.RPT report file. They can be used or the above VHDL code can be used to generate the proper .JED files. The LOS_CS1.JED files are available on request. /csbo = /csb * /a8 loopb = /loopb_en * loopb + loopb_dis * /loopb_en rser.D = sd_sample_BEH_i1_0_DFF.Q rser.C = poclk0 /prom_enb = /csb * a8 * a7 * a6 * a5 brstb = rstb * /set_reset piclk = poclk1 piclk.OE = rstb * /set_reset * /sd_sample_BEH_i1_0_DFF.Q * /rser.Q sd_sample_BEH_i1_0_DFF.D = sd sd_sample_BEH_i1_0_DFF.C = poclk0 set_reset = rstb * /csb * a8 * a7 * a6 * /a5 * d0 * /wrb + rstb * wrb * set_reset + rstb * a5 * set_reset + rstb * /a6 * set_reset + rstb * /a7 * set_reset + rstb * /a8 * set_reset + rstb * csb * set_reset
______________________________________________________________________________________________ A4
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
loopb_en = rstb * /csb * a8 * a7 * a6 * a5 * d0 * /wrb + rstb * /a5 * /d0 * loopb_en + rstb * wrb * loopb_en + rstb * /a6 * loopb_en + rstb * /a7 * loopb_en + rstb * /a8 * loopb_en + rstb * csb * loopb_en /loopb_dis = rstb * /csb * a8 * a7 * a6 * a5 * d0 * /wrb + rstb * /a5 * /d0 * /loopb_dis + rstb * wrb * /loopb_dis + rstb * /a6 * /loopb_dis + rstb * /a7 * /loopb_dis + rstb * /a8 * /loopb_dis + rstb * csb * /loopb_dis
______________________________________________________________________________________________ A5
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
-- UTOPIA interface PAL U16 -- Used to interface the Vicksburg Motherboard F-FRED chip -to the SUNI receive FIFOs USE work.bv_math.all; USE work.rtlpkg.all; -- necessary for inc_bv();
ENTITY rx_pal IS PORT (rxclk, resetb, rsoc, rca, RxenbB, low, paeb, pafb, ffb: IN BIT; rrdb, wclk, wen1b: OUT BIT); ATTRIBUTE order_code of rx_pal:ENTITY is "PAL22V10D-10PC"; ATTRIBUTE part_name of rx_pal:ENTITY IS "C22V10"; ATTRIBUTE pin_numbers of rx_pal:ENTITY IS "rxclk:1 " & "paeb:5 "& "RxenbB:6 " & "rsoc:7 "& "rca:8 "& "pafb:9 "& "ffb:10 "& "resetb:11 " & "low:13 "& "rrdb:14 " & "wclk:21 "& "wen1b:23"; END rx_pal; ARCHITECTURE behavior OF rx_pal IS SIGNAL count:bit_vector(5 downto 0); SIGNAL rca_sample: BIT; SIGNAL high :BIT := '1'; SIGNAL wclk_d,wen1b_d,rrdb_d:BIT; -- dummy bits BEGIN proc1: PROCESS -VARIABLE CountEnable: BIT; BEGIN
______________________________________________________________________________________________ A6
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
WAIT UNTIL (rxclk = '1'); -- Reset IF resetb = '0' THEN rca_sample <= '0'; Count <= "111111"; -- SET counter to 0 if RSOC goes high ELSIF ( rsoc = '1' ) THEN Count <= "000000"; -- Continue putting out data ELSIF rsoc = '0' AND ffb ='1' AND Count /= "111111" AND rca_sample = '1' THEN Count <= inc_bv(Count); -- increment bit vector END IF; -- Counter rolls over when count = 53 IF Count = "110011" AND rsoc = '0' THEN Count <= "111111"; END IF; IF rca = '1' THEN rca_sample <= '1'; ELSE rca_sample <= '0'; END IF; END process; proc2: PROCESS BEGIN -- Enable WEN1B to FIFO IF ( ffB = '0' ) THEN wen1b_d <= '1'; ELSE wen1b_d <= '0'; END IF; -- Enable RRDB to SUNI IF ( (rca = '0' AND Count /= "110011") OR resetb = '0' OR wen1b_d ='1' OR rxclk = '1') THEN rrdb <= '1'; ELSIF ( rca_sample = '1' AND resetb = '1' AND wen1b_d ='0' AND rxclk = '0' ) THEN rrdb <= '0';
______________________________________________________________________________________________ A7
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
END IF; -- Enable WCLK to FIFO IF ( wen1b_d = '1' AND rxclk = '1' ) THEN wclk <= '1'; ELSIF ( wen1b_d = '1' AND rxclk = '0' ) THEN wclk <= '0'; ELSIF ( (rca = '0' AND Count /= "110011") OR resetb = '0' OR rxclk = '1') THEN wclk <= '1'; ELSIF ( rca_sample = '1' AND resetb = '1' AND wen1b_d ='0' AND rxclk = '0' ) THEN wclk <= '0'; END IF; END process; b1:buf port map (wen1b_d,wen1b); END behavior;
______________________________________________________________________________________________ A8
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
DESIGN EQUATIONS (13:27:08) These equations were extracted from the RX.RPT report file. They can be used or the above VHDL code can be used to generate the proper .JED files. The RX.JED files are available on request. /rrdb = ffb * /rxclk * resetb * count_0_.Q * count_1_.Q * /count_2_.Q * /count_3_.Q * count_4_.Q * count_5_.Q * rca_sample.Q + ffb * /rxclk * resetb * /rrdb * count_0_.Q * count_1_.Q * /count_2_.Q * /count_3_.Q * count_4_.Q * count_5_.Q + ffb * /rxclk * rca * resetb * rca_sample.Q + ffb * /rxclk * rca * resetb * /rrdb /wclk = /rxclk * resetb * count_0_.Q * count_1_.Q * /count_2_.Q * /count_3_.Q * count_4_.Q * count_5_.Q * rca_sample.Q + /rxclk * resetb * count_0_.Q * count_1_.Q * /count_2_.Q * /count_3_.Q * count_4_.Q * count_5_.Q * /wclk + /rxclk * rca * resetb * rca_sample.Q + /rxclk * rca * resetb * /wclk + /ffb * /rxclk wen1b = /ffb rca_sample.D = rca rca_sample.C = rxclk count_5_.D = ffb * count_0_.Q * count_1_.Q * count_2_.Q * count_3_.Q * count_4_.Q * rca_sample.Q * /rsoc + count_5_.Q * /rsoc + /resetb count_5_.C = rxclk /count_4_.D = ffb * resetb * count_0_.Q * count_1_.Q * count_2_.Q * count_3_.Q * count_4_.Q * /count_5_.Q * rca_sample.Q + resetb * /count_4_.Q * /rca_sample.Q + resetb * /count_3_.Q * /count_4_.Q
______________________________________________________________________________________________ A9
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
+ resetb * /count_2_.Q * /count_4_.Q + resetb * /count_1_.Q * /count_4_.Q + resetb * /count_0_.Q * /count_4_.Q + /ffb * resetb * /count_4_.Q + resetb * rsoc count_4_.C = rxclk count_3_.D = ffb * count_0_.Q * count_1_.Q * count_2_.Q * /count_3_.Q * rca_sample.Q * /rsoc + count_0_.Q * count_1_.Q * /count_2_.Q * count_4_.Q * count_5_.Q * /rsoc + count_3_.Q * count_4_.Q * count_5_.Q * /rsoc + /count_2_.Q * count_3_.Q * /rsoc + /count_1_.Q * count_3_.Q * /rsoc + /count_0_.Q * count_3_.Q * /rsoc + count_3_.Q * /rca_sample.Q * /rsoc + /ffb * count_3_.Q * /rsoc + /resetb count_3_.C = rxclk count_2_.D = count_0_.Q * count_1_.Q * /count_2_.Q * /count_3_.Q * count_4_.Q * count_5_.Q * /rsoc + ffb * count_0_.Q * count_1_.Q * /count_2_.Q * rca_sample.Q * /rsoc + count_2_.Q * count_3_.Q * count_4_.Q * count_5_.Q * /rsoc + count_2_.Q * /rca_sample.Q * /rsoc + /ffb * count_2_.Q * /rsoc + /count_1_.Q * count_2_.Q * /rsoc + /count_0_.Q * count_2_.Q * /rsoc + /resetb count_2_.C = rxclk count_1_.D = count_1_.Q * /count_2_.Q * /count_3_.Q * count_4_.Q * count_5_.Q * /rsoc + count_1_.Q * count_2_.Q * count_3_.Q * count_4_.Q * count_5_.Q * /rsoc + ffb * count_0_.Q * /count_1_.Q * rca_sample.Q * /rsoc
______________________________________________________________________________________________ A 10
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
+ count_1_.Q * /rca_sample.Q * /rsoc + /ffb * count_1_.Q * /rsoc + /count_0_.Q * count_1_.Q * /rsoc + /resetb count_1_.C = rxclk count_0_.D = count_0_.Q * count_1_.Q * /count_2_.Q * /count_3_.Q * count_4_.Q * count_5_.Q * /rsoc + count_0_.Q * count_1_.Q * count_2_.Q * count_3_.Q * count_4_.Q * count_5_.Q * /rsoc + ffb * /count_0_.Q * rca_sample.Q * /rsoc + count_0_.Q * /rca_sample.Q * /rsoc + /ffb * count_0_.Q * /rsoc + /resetb count_0_.C = rxclk
______________________________________________________________________________________________ A 11
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
-- UTOPIA interface PAL U17 -- Used to interface the Vicksburg Motherboard F-FRED chip -to the SUNI transmit FIFOs USE work.bv_math.all; USE work.rtlpkg.all; -- necessary for inc_bv();
ENTITY tx_pal IS PORT (txclk, resetb, tsoc, tca, TxenbB, low, TxClavB: IN BIT; twrb, bufclk, tsoc_out, TxFullB: OUT BIT); ATTRIBUTE order_code of tx_pal:ENTITY is "PAL22V10D-10PC"; ATTRIBUTE part_name of tx_pal:ENTITY IS "C22V10"; ATTRIBUTE pin_numbers of tx_pal:ENTITY IS "txclk:1 " & "TxenbB:3 " & "TxClavB:6 " & "tsoc:7 "& "tca:9 "& "resetb:11 " & "low:13 "& "twrb:15 " & "bufclk:22 " & "TxFullB:23"; END tx_pal; ARCHITECTURE behavior OF tx_pal IS SIGNAL CountTemp: BIT_VECTOR(5 DOWNTO 0); SIGNAL TxEnbB_sample,twrb_en: BIT; BEGIN proc1: PROCESS -VARIABLE CountEnable: BIT; BEGIN WAIT UNTIL (txclk = '1'); -- Sample TxEnbB IF (TxEnbB = '1' OR TxClavb = '1' ) AND CountTemp = "111111" THEN TxEnbB_sample <= '1'; ELSE
______________________________________________________________________________________________ A 12
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
TxEnbB_sample <= '0'; END IF; -- Resetb = 0 IF resetb = '0' THEN CountTemp <= "111111"; TxEnbB_sample <= '1'; -- SET counter to 0 if TSOC goes high AND TxEnbB is low ELSIF ( tsoc = '1' AND TxEnbB_sample = '0') THEN CountTemp <= "000000"; -- Put out only the first byte of data if TxClavB is active (0) ELSIF TxClavB = '0' AND CountTemp /= "111111" AND tca = '1' AND TxEnbB_sample = '0' THEN CountTemp <= inc_bv(CountTemp); END IF; -- Counter rolls over when count = 53 IF CountTemp = "110100" THEN CountTemp <= "111111"; END IF; END process; proc2: PROCESS BEGIN IF (CountTemp = "110010" OR CountTemp = "110011" OR CountTemp = "110100" OR CountTemp = "110100" OR resetb = '0' OR tca = '0' ) THEN TxFullB <= '0'; ELSE TxFullB <= '1'; END IF; -- Enable TWRB for the rest of the cell IF (tca = '1' AND TSOC = '0' AND resetb = '1' AND CountTemp /= "111111" AND TxEnbB_sample ='0') THEN twrb_en <= '1'; ELSE twrb_en <= '0'; END IF; IF txclk = '0' AND twrb_en = '1' THEN twrb <= '0'; ELSE twrb <= '1'; END IF;
______________________________________________________________________________________________ A 13
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
IF txclk = '0' THEN bufclk <= '1'; ELSE bufclk <= '0'; END IF; END process; END behavior;
______________________________________________________________________________________________ A 14
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
DESIGN EQUATIONS
(19:56:20)
These equations were extracted from the TX.RPT report file. They can be used or the above VHDL code can be used to generate the proper .JED files. The TX.JED files are available on request. twrb = counttemp_0_.Q * counttemp_1_.Q * counttemp_2_.Q * counttemp_3_.Q * counttemp_4_.Q * counttemp_5_.Q + txenbb_sample.Q + txclk + tsoc + /tca + /resetb bufclk = /txclk /txfullb = /counttemp_0_.Q * /counttemp_1_.Q * counttemp_2_.Q * /counttemp_3_.Q * counttemp_4_.Q * counttemp_5_.Q + counttemp_1_.Q * /counttemp_2_.Q * /counttemp_3_.Q * counttemp_4_.Q * counttemp_5_.Q + /tca + /resetb counttemp_5_.D = tca * /tsoc * counttemp_0_.Q * counttemp_1_.Q * counttemp_2_.Q * counttemp_3_.Q * counttemp_4_.Q * /txenbb_sample.Q * /txclavb + /counttemp_0_.Q * /counttemp_1_.Q * counttemp_2_.Q * /counttemp_3_.Q * counttemp_4_.Q * counttemp_5_.Q + /tsoc * counttemp_5_.Q + counttemp_5_.Q * txenbb_sample.Q + /resetb counttemp_5_.C = txclk counttemp_4_.D = tca * /tsoc * counttemp_0_.Q * counttemp_1_.Q * counttemp_2_.Q * counttemp_3_.Q * /counttemp_4_.Q * /txenbb_sample.Q * /txclavb + /counttemp_0_.Q * /counttemp_1_.Q * counttemp_2_.Q * /counttemp_3_.Q * counttemp_4_.Q * counttemp_5_.Q + /tsoc * counttemp_4_.Q * counttemp_5_.Q + /tsoc * /counttemp_3_.Q * counttemp_4_.Q + /tsoc * /counttemp_1_.Q * counttemp_4_.Q + /tsoc * /counttemp_0_.Q * counttemp_4_.Q
______________________________________________________________________________________________ A 15
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
+ /tsoc * /counttemp_2_.Q * counttemp_4_.Q + /tsoc * counttemp_4_.Q * txclavb + /tca * /tsoc * counttemp_4_.Q + counttemp_4_.Q * txenbb_sample.Q + /resetb counttemp_4_.C = txclk counttemp_3_.D = tca * /tsoc * counttemp_0_.Q * counttemp_1_.Q * counttemp_2_.Q * /counttemp_3_.Q * /txenbb_sample.Q * /txclavb + /counttemp_0_.Q * /counttemp_1_.Q * counttemp_2_.Q * /counttemp_3_.Q * counttemp_4_.Q * counttemp_5_.Q + /tsoc * counttemp_3_.Q * counttemp_4_.Q * counttemp_5_.Q + /tsoc * /counttemp_2_.Q * counttemp_3_.Q + /tsoc * /counttemp_1_.Q * counttemp_3_.Q + /tsoc * /counttemp_0_.Q * counttemp_3_.Q + /tsoc * counttemp_3_.Q * txclavb + /tca * /tsoc * counttemp_3_.Q + counttemp_3_.Q * txenbb_sample.Q + /resetb counttemp_3_.C = txclk counttemp_2_.D = tca * /tsoc * counttemp_0_.Q * counttemp_1_.Q * /counttemp_2_.Q * /txenbb_sample.Q * /txclavb + /counttemp_0_.Q * /counttemp_1_.Q * counttemp_2_.Q * /counttemp_3_.Q * counttemp_4_.Q * counttemp_5_.Q + /tsoc * counttemp_2_.Q * counttemp_3_.Q * counttemp_4_.Q * counttemp_5_.Q + /tsoc * /counttemp_1_.Q * counttemp_2_.Q + /tsoc * /counttemp_0_.Q * counttemp_2_.Q + /tsoc * counttemp_2_.Q * txclavb + /tca * /tsoc * counttemp_2_.Q + counttemp_2_.Q * txenbb_sample.Q + /resetb counttemp_2_.C = txclk counttemp_1_.D = /tsoc * counttemp_1_.Q * counttemp_2_.Q * counttemp_3_.Q * counttemp_4_.Q * counttemp_5_.Q
______________________________________________________________________________________________ A 16
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
+ tca * /tsoc * counttemp_0_.Q * /counttemp_1_.Q * /txenbb_sample.Q * /txclavb + /counttemp_0_.Q * /counttemp_1_.Q * counttemp_2_.Q * /counttemp_3_.Q * counttemp_4_.Q * counttemp_5_.Q + /tsoc * /counttemp_0_.Q * counttemp_1_.Q + /tsoc * counttemp_1_.Q * txclavb + /tca * /tsoc * counttemp_1_.Q + counttemp_1_.Q * txenbb_sample.Q + /resetb counttemp_1_.C = txclk counttemp_0_.D = /tsoc * counttemp_0_.Q * counttemp_1_.Q * counttemp_2_.Q * counttemp_3_.Q * counttemp_4_.Q * counttemp_5_.Q + /counttemp_0_.Q * /counttemp_1_.Q * counttemp_2_.Q * /counttemp_3_.Q * counttemp_4_.Q * counttemp_5_.Q + tca * /tsoc * /counttemp_0_.Q * /txenbb_sample.Q * /txclavb + /tsoc * counttemp_0_.Q * txclavb + /tca * /tsoc * counttemp_0_.Q + counttemp_0_.Q * txenbb_sample.Q + /resetb counttemp_0_.C = txclk txenbb_sample.D = counttemp_0_.Q * counttemp_1_.Q * counttemp_2_.Q * counttemp_3_.Q * counttemp_4_.Q * counttemp_5_.Q * txclavb + counttemp_0_.Q * counttemp_1_.Q * counttemp_2_.Q * counttemp_3_.Q * counttemp_4_.Q * counttemp_5_.Q * txenbb + /resetb txenbb_sample.C = txclk
______________________________________________________________________________________________ A 17
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
APPENDIX B: MECHANICAL DRAWINGS
5.900 .220 .449 HOLE DIAMETER .140 x 4
.620
1.100 2.395
1.410
.820
1.645 .170
.050 x 45 2 PLCS
2.995
0.337
.650 .950 .195 0.220 .680 .495
Unit: inches
NSC_SAPI MECHANICAL DRAWING
.217
.100
.100
.100 .050 .010 .260 .437
AMP 101911-8 Edge Connector
Note: 100 pin, 100 position
______________________________________________________________________________________________ B1
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
APPENDIX C: MATERIAL LIST Item Qty Reference Description 1 1 E1 19.44 MHz 10ppm DIP Osc, .5" case, PECL levels, Connor-Winfield ECLFP5Q-19.44 MHz 2 1 U10 Saturn User Network Interface, 160 QFP, 0.025" pitch PMC-Sierra PM5345-RC 3 1 U2 SONET/SDH Serial Transceiver, clock and data recovery, 24-pin SOIC, Cypress CY7B951 4 3 U12, U16, CMOS PALs, 10ns prop, 28-pin PLCC, Cypress, U17 PAL22CV10D-10JC 5 2 U18, U19 CMOS bus interface register, 10 bit, 24-pin SOIC Jbend, IDT74FCT821Y 6 1 U1 parallel synchronous FIFO, 1024x9 bit, 20 Mhz, 32pin PLCC, IDT72221L20J for PLCC 7 1 U4 octal 3-state inverting buffer, 20-pin SOIC, Motorola 74HCT240DW 8 1 U11 745288 ROM, 32x8 ROM, 16pin DIP, AMD Am27S19, Or TBP18S030, or equivalent DIP ROM 9 1 U3 Fibre Optics transceiver, 9 pin, AT&T 1408A 10 1 J1 edge connector, 100 pin, 100 position, 0.050" pitch, AMP 103911-8 11 5 L1, L2, L4, ferrite beads, 0.2", SMT, Fair-Rite #2743019446 L5, L6 12 1 D1 LED, yellow, 0.1" spacing, right angle 13 1 D2 LED, green, 0.1" spacing, right angle 14 6 C45, C46, capacitors, 0.01 pF ceramic 50V, surface mount 805 C47, C48, C49, C50 15 1 C53 capacitor, 0.01 uF ceramic 50V, surface mount 1206 16 27 C1, C2, C3, capacitors, 0.1 uF ceramic 100V, 1206 C4, C5, C6, C7, C10, C11, C13, C16, C17, C19, C28, C29, C30, C31, C32, C33, C34, C36, C37, C40, C41, C42, C44, C54
______________________________________________________________________________________________ C1
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
17 18 19 20 21 22 23
6 1 2 2 3 3 13
C20, C21, C22, C23, C51, C52 C25
capacitors, 10uF solid tantalum 25V, radial leads, 0.1" spacing capacitor, 100uF electrolytic 25V, radial leads, 0.1 spacing resistors, 75 Ohm, 1/4 Watt, MF 1%, type 1206 SMT resistors, 59 Ohm, 1/4 Watt, MF 1%, type 1206 SMT resistors, 200 Ohm, MF 1%, type 805 SMT
24 25 26 27 28
2 2 1 1 8
R19, R21 R10, R11 R35, R36, R37 R22, R27, resistors, 200 Ohm, 1/4 Watt, MF 1%, type 1206 SMT R30 R1, R2, R3, resistors, 330 Ohm, 1/4 Watt, MF 1%, type 1206 SMT R4, R5, R6, R7, R8, R9, R23, R24, R28, R29 R12, R13 resistors, 312 Ohm, 1/4 Watt, MF 1%, type 1206 SMT R14, R15 resistors, 1.2K Ohm, 1/4 Watt, MF 1%, type 1206 SMT R34 resistors, 630 Ohm, 1/4 Watt, MF 1%, type 1206 SMT R33 resistors, 3.3K Ohm, 1/4 Watt, MF 1%, type 1206 SMT resistors, 4.7K Ohm, 1/4 Watt, MF 1%, type 1206 R16, R17, SMT R18, R20, R31, R32, R38, R39
______________________________________________________________________________________________ C2
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
APPENDIX D: COMPONENT PLACEMENT
______________________________________________________________________________________________ D1
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
APPENDIX E: SCHEMATICS
______________________________________________R1______________________________________________ _ PMC-Sierra, Inc. 8501 Commerce Court Burnaby, BC Canada V5A 4N3 604 668 7300
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
APPENDIX F: LAYOUT NOTES Background The SAPI board is a 4-layer board that has both throughole and surfacemount components. Protel's Autotrax version 2.0 for DOS is used to layout the board. The schematics is done using OrCAD. Layer 1 and 4 are signal layers. Layer 2 and 3 are ground and power respectively.. Trace Impedance Control To reduce signal degradation due to reflection and radiation, the impedance of the traces that carry high speed signals such as transmitted and received data should be treated as microstrip transmission lines and terminated with matching impedance. The calculation of the trace width is calculated using the formula Zo = 87 5.98 x h x ln 0.8 x w + t r + 1.41
and based on the following layer setup:
w t
1 Oz Copper
dielectric r
Ground Plane
h1 t h2 h3
dielectric r dielectric r
1 Oz Copper 1 Oz Copper
1 Oz Copper
Power Plane
t
where
r = relative dielectric constant, nominally 5.0 for G -10 fibre - glass epoxy t = thickness of the copper, fixed according to the weight of copper selected. For 1 oz copper, the thickness is 1.4 mil. This thickness can be ignored if w is great enough. h1, h2, h3 = thickness of dielectric. w = width of copper
______________________________________________________________________________________________ F1
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
The parameters h1, h2, and h3 can be specified. For example, if a 20 mil (including the copper thickness on both sides of the board) two layer core is selected, dielectric material that has the same relative dielectric constant can be added to the both sides of the core to construct a 4 layer board. Since all the controlled impedance traces are on the component side, only h1 is relevant in calculating the trace width. The calculation for the reference design is shown in the tables below:
Parameters Board Thickness (mil)
Min
Nominal 62.5 (including copper thickness) 14
Max
Separataion between layers 1 and 2 (mil) Separation between layers 2 and 3 (mil) Separation between layers 3 and 4 (mil) Relative dielectric constant 4.8
28
14
5.4
Parameter
Data 4.8 14 1.4 50 23.2 5.4 14 1.4 50 21.6 4.8 14 1.4 100 4.2 5.4 14 1.4 100 3.5
r
h (mil) t (mil) Zo (Ohm) W (mil)
Since h1 is directly proportional to the width of the traces, a small h1 will result in the traces being too thin to be accurately fabricated. Wider traces can be more precisely manufactured, but they take up too much board space. Therefore, the thickness of the board should be chosen so that the traces take up as little board space as possible yet still leaving enough margin to allow accurate fabrication.
______________________________________________________________________________________________ F2
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
The low speed signals use 8 to 10 mil traces. Power and ground traces are all as wide as the pads they connect to, up to a maximum width of 24 mil. All 50 Ohm traces are 24 mil wide. Routing Routing is based on the design considerations as well as manufacturability. Several suggestions are listed below: * * Turns and corners should be rounded to curves to avoid discontinuity in the signal path. Allow at least 10 mil clearance among vias, traces, and pads to prevent short and reduce crosstalk. If possible, allow 20 mil or more clearance around vias as manufacturers may have minimum clearance requirements. For the traces that run between pads of the 100 pin edge connector, clearance of 6 mil and trace width of 8 mil can be used. However, the number and lengths such traces should be kept to a minimum. The differential signal pairs should be of equal length so that both signals arrive at the inputs at the same time. They should also run parallel and close to one another for as long as possible so that noise will couple onto both lines and become common mode noise which is ignored by the differential inputs. Even though single ended inputs should not run parallel to one another in close proximity, since all of the single ended signals that run parallel to one another on the UTOPIA interface side are low speed signals and are sampled after they have all settled down, they should not cause any concern. All power and ground traces should be made as wide as possible, up to 24 mil to provide low impedance paths for the supply current as well as to allow quick noise dissipation. The oscillator used is a 14 pin DIP package. The connections to the oscillator is setup so that an oscillator with a smaller footprint (8 pin) can also be plugged in to save board space.
*
*
*
Power, Ground, and Decoupling Capacitors Only one supply voltage, nominally +5 Volts, is used by all devices on the board and referenced to by all PECL signals. One solid ground plane is also used. Ferrite beads are deployed to prevent digital noise from entering analog circuits of the SUNI, the PECL oscillator, and the optic transceiver.
______________________________________________________________________________________________ F3
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
Bypass capacitors can supply transient current and help filter out power and ground noise. They are placed as close to the pins as possible. Minimum of one 0.1 uF bypass capacitor per device is used. Wherever possible, one 0.1 uF bypass capacitor is placed at each power pin of each IC. For high speed IC's, such as the CY7B951, an additional 0.01 uF bypass capacitor is added to each power pin. A 10 uF electrolytic bypass capacitor is also deployed by the SUNI, the oscillator, and the CY7B951 devices. A large electrolytic bypass capacitor (47 to 100 uF) should be placed as near the power supply as possible. Special Power and Ground Requirements of CY7B951 A special power plane is provided on the component side for the Cypress CY7B951 device. The power plane under the IC provides a low impedance path connecting pin 6, 17, and 19.
0.01 uF
1 6
0.01 uF
0.1 uF
Vcc
0.1 uF
19
0.1 uF
17
0.1 uF
= Via connected to Vcc
Power Plane and Decoupling of CY7B951
Pin 6 of the CY7B951 provides current for all output pins and is internally connected to pin 17 and 19. Its voltage fluctuates as the outputs switch. When the voltage difference between pin 6 and pins 17 and 19 will be amplified, causing the voltage fluctuation on pin 6 to increase. When the voltage at pin 6 fluctuates, the outputs it drives will start to draw more current which causes the voltage on pin 6 to fluctuate further. Testing has shown this fluctuation can reach 2 V p-p.
______________________________________________________________________________________________ F4
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
The low impedance power plane puts pin 6, 17, and 19 at the same voltage level so that if pin 6 fluctuates due to outputs switching, pin 17 and 19 will follow, preventing any voltage difference to be established between them. Mounting Hole Clearance Requirements The following clearances are required in order for the board to be mounted onto the Vicksburg Motherboard: * On the component side, each mounting hole should have 0.25"x0.25" square clearance centered at the center of the mounting hole.
0.25 0.25
Component Side
* One the solder side, each of the three mounting holes for the Vicksburg Motherboard has a rectangular clearance. The clearance of the mounting hole for the bracket is also outlined in the following diagram.
0.2 0.2 0.2
0.25 0.25 0.65
Solder Side Unit: inch
Misc
______________________________________________________________________________________________ F5
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
Following suggestions may be useful: * Due to the high speed of the signals, ground leads of probe scopes should be kept as short as possible. To aid signal probing, all ground and power vias should be marked in some consistent fashion. All surfacemount capacitors are ceramic. RF rated capacitors are not essential. Label the positive terminals of polarized capacitors such as tantalum capacitors.
* *
______________________________________________________________________________________________ F6
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
APPENDIX G: LAYOUT
______________________________________________________________________________________________ G1
PMC-Sierra, Inc.
STANDARD PRODUCT
PM5945 SAPI
PMC-940106 ISSUE 3, May 16, 1994 SAPI DAUGHTERBOARD ______________________________________________________________________________________________
______________________________________________________________________________________________ PMC-Sierra, Inc. 8501 Commerce Court Burnaby, BC Canada V5A 4N3 604 668 7300

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