Scripts Overview - LSI LSI53C875A Technical Manual

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
S
Y
S
T
E
M
P
C
I
B
U
S
High Level SCSI SCRIPTS Mode
Write DSA
Write
DSP
Fetch
SCRIPTS
LSI53C875A
For details,
see block
diagram in
Chapter 2
Data
SCSI Bus
5-5