LSI 53C875A User Manual
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
address
byte count
address
address
byte count
address
address
byte count
address
address
Data Structure
Message Buffer
Command Buffer
Data Buffer
Status Buffer
Message Buffer
Command Buffer
Data Buffer
Status Buffer
B
U
U
S
S
Y
S
T
E
Y
S
T
E
M
Write DSA
Write
DSP
DSP
Fetch
SCRIPTS
Data
LSI53C875A
SCSI Bus
see block
diagram in
Chapter 2
For details,
P
C
I