Chapter2 functional description, 1 scsi functional description, 1 scsi core – Avago Technologies LSI8751D User Manual
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LSI53C875/875E PCI to Ultra SCSI I/O Processor
2-1
Chapter 2
Functional Description
Chapter 2 is divided into the following sections:
•
Section 2.1, “SCSI Functional Description”
•
Section 2.2, “Designing an Ultra SCSI System”
•
Section 2.3, “Prefetching SCRIPTS Instructions”
•
Section 2.4, “External Memory Interface”
•
•
Section 2.6, “Power Management”
2.1 SCSI Functional Description
The LSI53C875 is composed of three functional blocks: the
,
the
, and the
. The LSI53C875 is fully
supported by SDMS software, a complete software package that
supports the LSI Logic product line of SCSI processors and controllers.
The PCI Bus Power Management support (LSI53C875E) is discussed
Section 2.6, “Power Management.”
2.1.1 SCSI Core
The SCSI core supports the 8-bit or 16-bit data bus. It supports Ultra
SCSI synchronous transfer rates up to 40 Mbytes/s, SCSI synchronous
transfer rates up to 20 Mbytes/s, and asynchronous transfer rates up to
10 Mbytes/s on a 16-bit wide SCSI bus. The SCSI core can be
programmed with SCSI SCRIPTS, making it easy to “fine tune” the
system for specific mass storage devices or SCSI-3 requirements.