LSI53C875 LSI Logic, LSI53C875 Datasheet - Page 20

• Manufacturer Part Number: LSI53C875
• Description: PCI to Ultra SCSI I/O Processor
• Manufacturer: LSI Logic

1.4 LSI53C875 Benefits Summary
1.4.1 SCSI Performance
1-6
The section provides an overview of the LSI53C875 features and
benefits. It contains information on
Integration,
To improve SCSI performance, the LSI53C875:
General Description
Includes 4 Kbyte internal RAM for SCRIPTS instruction storage.
Performs wide, Ultra SCSI synchronous transfers as fast as
40 Mbytes/s.
Increases SCSI synchronous offset from 8 to 16 levels.
Supports variable block size and scatter/gather data transfers.
Performs sustained memory-to-memory DMA transfers faster than
47 Mbytes/s (@ 33 MHz).
Minimizes SCSI I/O start latency.
Performs complex bus sequences without interrupts, including
restore data pointers.
Reduces interrupt service routine overhead through a unique
interrupt status reporting method.
Performs fast and wide SCSI bus transfers in SE and differential
mode.
–
–
Supports Load and Store SCRIPTS instructions to increase the
performance of data transfers to and from chip registers.
Supports target disconnect and later reconnect with no interrupt to
the system processor.
Supports multithreaded I/O algorithms in SCSI SCRIPTS with fast
I/O context switching.
Supports expanded Register Move instructions to support additional
arithmetic capability.
Complies with PCI Bus Power Management Specification
(LSI53C875E) Revision 1.0.
10 Mbytes/s asynchronous (20 Mbytes/s with Ultra SCSI).
20 Mbytes/s synchronous (40 Mbytes/s with Ultra SCSI).
Ease of
Use, Flexibility, Reliability, and Testability.
SCSI
Performance,
PCI
Performance,