Avago Technologies LSI53C1010 - Manual (Page 251)

SCSI SCRIPTS Processors 11-1
Chapter 11
Using the SCRIPTS
Processor in Target
Applications
This chapter describes using chips with the SCRIPTS processor in target
applications and includes these topics:
•
Section 11.1, “SCSI and Target SCRIPTS Protocol,” page 11-1
•
Section 11.2, “Registers Used for Target Operation,” page 11-3
•
Section 11.3, “Using SCRIPTS for Target Operation,” page 11-3
•
Section 11.4, “Synchronous Negotiation by a Target Device,”
page 11-16
11.1 SCSI and Target SCRIPTS Protocol
The LSI53C7XX/8XX/10XX family of chips run on target as well as host
devices. Target operation is very similar to host operation, except that the
SCRIPTS processor responds to SCSI commands from the host rather
than initiating the commands. The basic structure of all target operations
is:
•
The SCRIPTS processor issues a Wait Select instruction.
•
The SCSI bus goes into Message Out phase.
•
The SCRIPTS processor performs a series of Block Moves
corresponding to the next four SCSI bus phases. See
Table 11.1 .
•
The SCRIPTS processor issues a Disconnect instruction to
disconnect the target device from the bus.