Avago Technologies LSI53C896 - Manual (Page 229)

LSI53C896 PCI to Dual Channel Ultra2 SCSI Multifunction Controller 5-1
Version 3.3 Copyright © 1998–2003 by LSI Logic Corporation. All rights reserved.
Chapter 5
SCSI SCRIPTS Instruction Set
After power-up and initialization, the LSI53C896 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.
Another feature allowed at the low level is loopback testing. In loopback
mode, the SCSI core can be directed to talk to the DMA core to test
internal data paths all the way out to the chip’s pins.
The following sections describe the benefits and use of SCSI SCRIPTS.
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Section 5.1, “SCSI SCRIPTS”
•
Section 5.2, “Block Move Instructions”
•
Section 5.3, “I/O Instructions”
•
Section 5.4, “Read/Write Instructions”
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Section 5.5, “Transfer Control Instructions”
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Section 5.6, “Memory Move Instructions”
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Section 5.7, “Load/Store Instructions”