Avago Technologies LSI8751D - Manual (Page 22)

1-8 General Description
•
Compiler-compatible with existing LSI53C7XX and LSI53C8XX
family SCRIPTS.
•
Direct connection to PCI, and SCSI SE and differential buses.
•
Development tools and sample SCSI SCRIPTS available.
•
Maskable and pollable interrupts.
•
Wide SCSI, A or P cable, and up to 16 devices are supported.
•
Three programmable SCSI timers: Select/Reselect, Handshake-to-
Handshake, and General Purpose. The time-out period is
programmable from 100
µ
s to greater than 25.6 seconds.
•
SDMS software for complete PC-based operating system support.
•
Support for relative jumps.
•
SCSI Selected As ID bits for responding with multiple IDs.
1.4.5 Flexibility
The following features increase the flexibility of the LSI53C875:
•
High level programming interface (SCSI SCRIPTS).
•
Programs local memory and bus Flash memory.
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Big/little endian support.
•
Selectable 88 or 536 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.
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Fetch, Master, and Memory Access control pins.
•
Separate SCSI and system clocks.
•
SCSI clock doubler bits enable Ultra SCSI transfer rates with a
40 MHz SCSI clock.
•
Selectable IRQ pin disable bit.
•
32 additional scratch pad registers.
•
Ability to route system clock to SCSI clock.