Chapter1 general description, Chapter 1, general description, Chapter 1 general description – Avago Technologies LSI53C876E User Manual
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LSI53C876/876E PCI to Dual Channel SCSI Multifunction Controller
1-1
Chapter 1
General Description
This chapter includes the following sections:
•
Section 1.1, “Wide Ultra SCSI Benefits”
•
•
Section 1.3, “LSI53C876 Benefits”
This manual combines information for the LSI53C876 and LSI53C876E,
which are a PCI to dual SCSI controllers. The LSI53C876E is a minor
modification of the existing LSI53C876 product. It has all of the
functionality of the LSI53C876 with the addition of features to enable it
to comply with the Microsoft PC 97 Hardware Design Guide. Specifically,
the LSI53C876E has a Power Management Support enhancement.
Because there are only slight differences between them, the LSI53C876
and LSI53C876E are referred to as LSI53C876 throughout this technical
manual. Only the new enhancements are referred to as LSI53C876E.
The LSI53C876 PCI to Dual Channel SCSI Multifunction Controller is a
PCI 2.1 compliant device. It implements two LSI53C875 PCI to Ultra
SCSI controllers on a single chip. The LSI53C876 presents only one load
to the PCI bus, and it uses one REQ/ - GNT/ signal pair in arbitration for
PCI bus mastership.
Two packaging options are available. The 208-pin Plastic Quad Flat Pack
(PQFP) provides a differential Single-Ended (SE) SCSI interface on SCSI
Function A and an SE interface on SCSI Function B. The 256-bump Ball
Grid Array (BGA) provides a differential SE interface on both SCSI
Function A and SCSI Function B.
The LSI53C876 has a local memory bus for storage of the device’s BIOS
ROM in Flash memory or standard EPROMs. The LSI53C876 supports
programming of local Flash memory for updates to BIOS or SCRIPTS™
programs.