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P C I - U LT R A S C S I C O N T R O L L E R
BENEFITS
鈥?Pin-for-pin replacement for
LSI53C825 and LSI53C825AE
devices
鈥?Minimal software and hardware
modifications required for Ultra
SCSI support
鈥?Compact 160-pin PQFP reduces
board space requirements
(LSI53C875E, LSI53C875JE)
OVERVIEW
The LSI53C875E controller supports Ultra SCSI transfers, enabling the
chip to transfer SCSI data at up to 40 MBps across a 16-bit bus. Ultra SCSI
is an extension of the SCSI-3 standard that expands the bandwidth of the
SCSI bus and allows faster synchronous SCSI transfer rates-approximately
double the synchronous transfer rates of fast SCSI-2. The LSI53C875E provides
full SCSI-2 capabilities and reduces the requirements for system BIOS support
with a local memory interface. It also features LSI Logic TolerANT SCSI driver
and receiver technology, for reliable operation in all cabling environments. It
is designed to connect gluelessly to the Peripheral Component Interconnect
(PCI) bus, and supports PCI extended access cycles, enabling the system
architect to take advantage of PCI鈥檚 performance potential.
廬
鈥?Alternative 169 BGA package
(LSI53C875JBE)
鈥?Direct PCI to SCSI connection
鈥?Fully supported by SDMS
software for complete PC-based
operating system support
FEATURES
鈥?Performs wide high-speed SCSI
bus transfers in single-ended
and differential mode up to:
鈥?40 MBps synchronous (Ultra)
鈥?14 MBps asynchronous
鈥?SCRIPTS
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Instruction Prefetch
鈥?536-byte buffer allows burst
length of up to 128 transfers
鈥?Load and store instruction
鈥?4 KB static RAM for SCRIPTS
instruction storage
鈥?32 additional scratchpad
registers for user-defined functions
The LSI53C875E and SDMS
鈩?/div>
software provide a total Ultra SCSI solution
in PC and workstation environments. LSI Logic鈥檚 SDMS software package
supports the entire LSI53C8XX family of PCI-to-SCSI controllers plus a wide
range of SCSI peripheral devices.
Included in the performance-enhancing features on the LSI53C875E is
a 4 KB static RAM for SCRIPTS (the LSI Logic developed SCSI programming
language) instruction storage, which allows tailored SCSI sequences to be
executed locally. A 536-byte DMA FIFO increases system performance by
allowing burst lengths of up to 128 transfers. Other features include:
鈥?SCRIPTS instruction prefetch which permits fetching four or eight double
words of instructions or instruction operands.
鈥?Support for PCI extended access cycles: Memory Read Multiple, Memory
Read Line, and Memory Write and Invalidate.
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