Avago Technologies LSI53C1010 - Manual (Page 187)

SCSI SCRIPTS Processors 8-1
Chapter 8
Writing Device Drivers
with SCRIPTS
This chapter describes writing SCSI device drivers with SCRIPTS and
contains the following sections:
•
Section 8.1, “Device Driver Overview,” page 8-1
•
Section 8.2, “Command Block,” page 8-4
•
Section 8.3, “Power Up Example,” page 8-4
•
Section 8.4, “I/O Request Process,” page 8-5
•
Section 8.5, “How to Write a Device Driver with SCRIPTS,” page 8-6
•
Section 8.6, “Table Indirect Addressing,” page 8-7
•
Section 8.7, “Relative Addressing,” page 8-11
8.1 Device Driver Overview
The architecture of a SCSI system can be viewed in layers, with each
layer providing data to the layers immediately above and below. The
device driver interfaces between the host operating system and the chip
hardware and firmware. The device driver, host operating system, and all
applications reside in the host computer's main memory. The
LSI53C7XX/8XX/10XX family is a separate hardware component, but
has direct access to host memory.
Figure 8.1 shows the relationship of
the device driver to other parts of the SCSI system.