Avago Technologies LSI53C1000R - Manual (Page 243)

LSI53C1000R PCI to Ultra160 SCSI Controller Technical Manual 5-1
Version 2.2 Copyright © 2000–2003 by LSI Logic Corporation. All rights reserved.
Chapter 5
SCSI SCRIPTS Instruction Set
After power-up and initialization, the LSI53C1000R can operate in the
low level register interface mode, or use SCSI SCRIPTS.
With the low level register interface, the user has access to the DMA
control logic and the SCSI bus control logic. An external processor has
access to the SCSI bus signals and the low level DMA signals, which
allow creation of complicated board level test algorithms. The low level
interface is useful for backward compatibility with SCSI devices that
require certain unique timings or bus sequences to operate properly.
The following sections describe the benefits and use of SCSI SCRIPTS.
•
Section 5.1, “SCSI SCRIPTS”
•
Section 5.2, “Block Move Instructions”
•
Section 5.3, “I/O Instructions”
•
Section 5.4, “Read/Write Instructions”
•
Section 5.5, “Transfer Control Instructions”
•
Section 5.6, “Memory Move Instructions”
•
Section 5.7, “Load and Store Instructions”
5.1 SCSI SCRIPTS
To operate in the SCSI SCRIPTS mode, the LSI53C1000R requires only
a SCRIPTS start address. The start address must be at a Dword (4-byte)
boundary. This aligns all the following SCRIPTS at a Dword boundary
because all SCRIPTS are 8 or 12 bytes long. Instructions are fetched
until an interrupt instruction is encountered, or until an unexpected event
(such as a hardware error) causes an interrupt to the external processor.