Avago Technologies LSI53C896 - Manual (Page 101)

SCSI Bus Interface Signals 3-13
Version 3.3 Copyright © 1998–2003 by LSI Logic Corporation. All rights reserved.
3.3 SCSI Bus Interface Signals
The SCSI Bus Interface Signals section contains tables describing the
signals for the following signal groups:
SCSI Bus Interface Signals ,
SCSI Function A Signals , and SCSI Function B Signals . SCSI Function A
signals and SCSI Function B signals each have a subgroup:
SCSI Function A_SCTRL Signals signals and
SCSI Function B_SCRTL Signals signals.
The following table contains signals that are common to both SCSI buses.
Table 3.10 describes the signals for the SCSI Bus Interface Signals group.
3.3.1 SCSI Function A Signals
This section describes the signals for the SCSI Function A Signals group.
It is divided into two tables: SCSI Function A Signals and
SCSI Function A_SCTRL Signals .
Table 3.10 SCSI Bus Interface Signals
Name Bump Type Strength Description
SCLK A21 I N/A SCSI Clock derives all SCSI-related timings. The speed of
this clock is determined by the application’s requirements. In
some applications, SCLK may be sourced internally from the
PCI bus clock (CLK). If SCLK is internally sourced, then the
SCLK pin should be tied LOW. For Ultra2 SCSI operations,
the clock supplied to SCLK must be 40 MHz. The clock
frequency is quadrupled to create the 160 MHz clock
required internally by both SCSI functions.