sym53c876e data sheet sym53c876e pci-dual channel scsi multi-function controller the sym53c876e pci-dual channel scsi multi- function controller brings the proven performance of the sym53c8xx family of pci-scsi i/o processors to a new performance and integration level. this single-chip multi-function device connects directly to the pci bus, presenting one electrical load, while functioning as a single 32-bit pci dma bus master. it contains two wide ultra scsi interfaces for maximum performance and flexibility. the sym53c876e, and its companion host adapters that support both single-ended and differential scsi environments, along with a complete set of scsi drivers, provide a total scsi solution in desktop, workstation, server, and raid environments. benefits ? true pci multi-function device provides direct connection from the pci bus to two independent bus mastering ultra scsi channels ? one device replaces two, reducing the number of pci bus loads and bus masters in the system ? increases throughput up to twofold for systems that now operate with single channel scsi ? high performance wide ultra scsi solution based on the proven technology of the sym53c875 i/o processor general features ? two independent dma channels with internal programmable arbitration ? motherboard or host adapter solution - bios can be stored in system, or in local eprom or flash memory ? lsi logic provides complete software support with bios and drivers ? allows custom driver development with lsi logic scsi scripts tm ? 208-pin pqfp or 256-pin bga package ? supports ieee 1149.1 jtag boundary scan for improved testability ? compliant with microsoft pc 97 and pc 98 lr
pci features ? true multi-function device as defined in pci 2.1 specification - presents only one load to the pci bus ? connects directly to the pci bus without external logic ? functions as one 32 bit pci dma bus master ? supports 33 mhz pci bus zero wait state operation ? supports maximum burst transfer rate of 132 mb/s ? supports shared or separate interrupts on the pci bus for maximum flexibility ? pci subsystem vendor id and subsystem id support with 2-wire serial eeprom port on each channel ? supports pci extended access cycles ? supports 3.3v and 5v pci interface scsi features ? 16 bit ultra scsi design based on the existing sym53c875 for maximum performance ? one differential channel (can be configured as single- ended) and one single-ended channel* ? up to 40 mb/s synchronous transfer rate on each channel ? two separate high-performance scsi cores with integrated scripts processors ? local memory bus for bios storage, including eprom and flash memory ? lsi logic tolerant? active negation scsi driver and receiver technology ? 536 byte dma fifo on each channel allows pci burst length up to 128 dwords ? 4 kb scripts ram on each channel reduces or eliminates instruction fetches over the pci bus ? 8 dword scripts instruction prefetch buffer to reduce pci bus overhead ? 41 scratchpad registers on each channel for user- defined functions ? scsi bus loopback diagnostics to test cable integrity ? scam (scsi configured automatically) level 1 functionality for scsi plug and play support ? software drivers and scripts compatible with sym53c825a and sym53c875 C software written for the sym53c875 operates as is with the sym53c876e * a separate device in a 256-pin bga package is available with two differential channels (can be configured as single-ended). local memory buses a parallel rom interface supports both channels with up to one megabyte of external memory, allowing the use of expansion rom for add-in pci cards. for ease of software development and field upgrades of the devices local rom, the interface supports local programming of flash memory. a ser ial 2-wire interface on each scsi channel provides a connection to an external serial eeprom for storing the subsystem vendor id and subsystem id. direct connection to pci drawing upon lsi logic long-term participation in pci standards committees, this part was designed with pci compliance in mind, as were all of the lsi logic sym53c8xx family parts. the sym53c876e pci-dual channel scsi multi-function controller is fully compliant with the pci 2.1 specification, including the requirements for multi-function devices. software support lsi logic provides a complete software solution with bios and drivers to support the sym53c876e and the entire sym53c8xx family of pci-scsi i/o controllers. drivers are available for netware, windows nt, dos, windows 3.1, windows 95, unixware, os/2, and sco unix openserver.
speakers fixed disk, optical disk, printer, tape, and other peripherals pci to ultra scsi pci to ultra scsi scsi bus scsi bus pci graphic accelerator pci sound card pci bus interface controller sym53c876 multi-function controller one pci bus load memory controller memory central processing unit (cpu) pci bus processor bus typical pci computer system architecture monitor fixed disk, optical disk, printer, tape, and other peripherals typical sym53c876e system application sym53c876e block diagram
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