Avago Technologies LSI8751D - Manual (Page 20)

1-6 General Description
1.4 LSI53C875 Benefits Summary
The section provides an overview of the LSI53C875 features and
benefits. It contains information on
SCSI Performance , PCI Performance ,
Integration , Ease of Use , Flexibility , Reliability , and Testability .
1.4.1 SCSI Performance
To improve SCSI performance, the LSI53C875:
•
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.
– 10 Mbytes/s asynchronous (20 Mbytes/s with Ultra SCSI).
– 20 Mbytes/s synchronous (40 Mbytes/s with Ultra SCSI).
•
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.