Avago Technologies LSI53C140 - Manual (Page 19)

LSI53C140 Ultra2 SCSI Bus Expander 2-1
Ver. 2.1 Copyright © 1998–2001 by LSI Logic Corporation. All rights reserved.
Chapter 2
Functional
Descriptions
This chapter describes all signals, their groupings, and their functions. It
includes these topics:
•
Section 2.1, “Interface Signal Descriptions,” page 2-1
•
Section 2.2, “SCSI Signal Descriptions,” page 2-6
2.1 Interface Signal Descriptions
The LSI53C140 has no programmable registers, and therefore, no
software requirements. SCSI control signals control all LSI53C140
functions.
Figure 2.1 shows a block diagram of the LSI53C140 device
divided into the following blocks:
•
A Side SCSI Control Block
– LVD, SE, and HVD drivers and receivers
•
B Side SCSI Control Block
– LVD, SE, and HVD drivers and receivers
•
Retiming Logic
•
Precision Delay Control
•
State Machine Control