Avago Technologies LSI53C120 - Manual (Page 13)

LSI53C120 Ultra SCSI Bus Expander 1-1
Chapter 1
Introduction
This chapter describes the LSI53C120 Ultra SCSI Bus Expander and its
applications. It includes these topics:
•
Section 1.1, “General Description,” page 1-1
•
Section 1.2, “Features,” page 1-3
•
Section 1.3, “Application Examples,” page 1-4
1.1 General Description
The LSI53C120 Ultra SCSI Bus Expander is a single chip solution
allowing the extension of device connectivity and/or cable length limits of
the SCSI bus. The LSI53C120 operates as a Ultra SCSI bus expander
when multiple single-ended to single-ended cables are connected
together while being electrically isolated from each other. The LSI53C120
also operates as a SCSI bus converter when single-ended to differential
cables are connected together while being electrically isolated from each
other.
The LSI53C120 operates in two modes: single-ended to single-ended
(Extender Mode) or single-ended to High Voltage Differential (HVD)
(Converter Mode). For applications requiring SE to Low Voltage
Differential (LVD), use the LSI53C141 SCSI Bus Expander.
Table 1.1
shows all modes of operation.
Table 1.1 Modes of Operation
Product Extender Converter
LSI53C120 SE to SE SE to HVD
LSI5353C141 SE to SE SE to LVD