LSI 53C875A Computer Hardware User Manual


 
LSI53C875A Benefits Summary 1-7
Up to one megabyte of add-in memory support for BIOS and
SCRIPTS storage.
Reduced SCSI development effort.
Compiler-compatible with existing LSI53C7XX and LSI53C8XX
family SCRIPTS.
Direct connection to PCI and SCSI SE.
Development tools and sample SCSI SCRIPTS available.
Five GPIO pins.
Maskable and pollable interrupts.
Wide SCSI, A or P cable, and up to 15 devices supported.
Three programmable SCSI timers: Select/Reselect,
Handshake-to-Handshake, and General Purpose. The time-out
period is programmable from 100
µs to greater than 25.6 seconds.
Software for PC-based operating system support.
Support for relative jumps.
SCSI Selected as ID bits for responding with multiple IDs.
1.4.5 Flexibility
The LSI53C875A provides:
High level programming interface (SCSI SCRIPTS).
Ability to program local and bus flash memory.
Selectable 112 or 944 byte DMA FIFO for backward compatibility.
Tailored SCSI sequences execute from main system RAM or internal
SCRIPTS RAM.
Flexible programming interface to tune I/O performance or to adapt
to unique SCSI devices.
Support for changes in the logical I/O interface definition.
Low level access to all registers and all SCSI bus signals.
Fetch, Master, and Memory Access control pins.
Separate SCSI and system clocks.