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

Write DSA

Write

 

DSP

 

 

 

 

 

Fetch

 

SCRIPTS

LSI53C875A

 

 

 

 

For details,

 

 

see block

 

 

diagram in

 

 

Chapter 2

Data

 

 

SCSI Bus

High Level SCSI SCRIPTS Mode

5-5

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LSI 53C875A technical manual Scripts Overview