Avago Technologies LSI53C180 - Manual (Page 11)

LSI53C180 Ultra3 SCSI Bus Expander 1-1
Chapter 1
Introduction
This chapter describes the LSI53C180 Ultra160 SCSI Bus Expander and
its applications. It includes these sections:
•
Section 1.1, “General Description,” page 1-1
•
Section 1.2, “Ultra160 SCSI,” page 1-6
1.1 General Description
The LSI53C180 Ultra160 SCSI Bus Expander is a single chip solution
allowing the extension of SCSI device connectivity and/or cable length
limits. A SCSI bus expander couples bus segments together without any
impact to the SCSI protocol, software, or firmware. The LSI53C180
Ultra160 SCSI Bus Expander connects Single-Ended (SE) Ultra and Low
Voltage Differential (LVD) Ultra160 peripherals together in any
combination. The LSI53C180 does not support High Voltage Differential
(HVD) mode.
The LSI53C180 is capable of supporting any combination of SE or LVD
bus mode on either the A or B Side port. This provides the system
designer with maximum flexibility in designing SCSI backplanes to
accommodate any SCSI bus mode. The LSI53C180 has independent
RBIAS pins allowing margining for each bus. A 10 k
Ω
pull-up resistor on
RBIAS is required to provide the correct LVD levels.