Avago Technologies LSI53C320 - Manual (Page 12)

1-2 Introduction
Version 2.2 Copyright © 2003 by LSI Logic Corporation. All rights reserved.
Figure 1.1 shows the two SCSI bus modes available on the A or B Side.
LVDlink transceivers provide the multimode LVD or SE capability. The
LSI53C320 operates as both an expander and a converter. In both SCSI
Bus Expander and Converter modes, the LSI53C320 isolates the cable
segments on the A Side and the B Side. This feature maintains the signal
integrity of each cable segment.
Figure 1.1 LSI53C320 SCSI Bus Modes
Table 1.1 shows the types of operational modes for the LSI53C320.
The LSI53C320 provides additional control capability through the pin-
level isolation mode (Warm Swap Enable). This feature permits logical
disconnection of the A Side bus or the B Side bus without disrupting
SCSI transfers currently in progress. For example, users can logically
disconnect the B Side bus while the A Side bus remains active.
The LSI53C320 is based on proven LSI Logic bus expander technology,
which includes signal filtering along with retiming to maintain skew
budgets. The LSI53C320 is independent of software. However, Domain
Validation technology does require software control.
Note: The LSI53C320 does not support Quick Arbitration and
Selection (QAS) while operating at Ultra160 SCSI rates.
Table 1.1 Types of Operation
Signal Type Speed
LVD to LVD Up to Ultra320 SCSI
SE to SE Up to Ultra SCSI
LVD to SE Up to Ultra SCSI
SE to LVD Up to Ultra SCSI
LSI53C320
SCSI Expander
A Side B Side
LVD
SE
LVD
SE