Avago Technologies LSI53C140 - Manual (Page 5)

LSI53140 Ultra2 SCSI Bus Expander v
Ver. 2.1 Copyright © 1998–2001 by LSI Logic Corporation. All rights reserved.
Contents
Chapter 1 Using the LSI53C140
1.1 General Description 1-1
1.2 Applications 1-3
1.2.1 Features 1-6
1.2.2 Specifications 1-7
1.3 Benefits of LVDlink 1-7
Chapter 2 Functional Descriptions
2.1 Interface Signal Descriptions 2-1
2.1.1 SCSI A Side and B Side Control Blocks 2-2
2.1.2 Retiming Logic 2-4
2.1.3 Precision Delay Control 2-5
2.1.4 State Machine Control 2-5
2.1.5 DIFFSENS Receiver 2-5
2.1.6 Dynamic Transmission Mode Changes 2-6
2.2 SCSI Signal Descriptions 2-6
2.2.1 Data and Parity (SD and SDP) 2-7
2.2.2 SCSI Bus Activity LED (BSY_LED) 2-8
2.2.3 Select Control (SSEL) 2-8
2.2.4 Busy Control (SBSY) 2-9
2.2.5 Reset Control (SRST) 2-9
2.2.6 Request and Acknowledge Control
(SREQ and SACK)
2-10
2.2.7 Control/Data, Input/Output, Message, and
Attention Controls (SCD, SIO, SMSG, and SATN)
2-11
2.2.8 Differential Direction Control 2-11
2.2.9 A and B HVD Mode (A_HVD_MODE and
B_HVD_MODE)
2-12