LSI 53C875A - Manual (Page 205)

High Level SCSI SCRIPTS Mode 5-5
Figure 5.1 SCRIPTS Overview
System Processor
System Memory
SCSI Initiator Write Example
×
Select ATN 0, alt_addr
× Move from identify_msg_buf,
when MSG_OUT
× Move from data_buf when DATA_OUT
×
Move from stat_in_buf, when STATUS
× Move SCNTL2 & 7F to SCNTL2
× Clear ACK
× Wail disconnect alt2
× Int 10
Table
byte count
address
byte count
address
byte count
address
byte count
address
Data Structure
Message Buffer
Command Buffer
Data Buffer
Status Buffer
B
U
S
S
Y
S
T
E
M
Write DSA
Write
DSP
Fetch
SCRIPTS
Data
LSI53C875A SCSI Bus
see block
diagram in
Chapter 2
For details,
P
C
I