Section 6
CONTROLLER INITIALIZATION AND SELF-TEST PROCEDURES
6.1 OVERVIEW
This section describes the diagnostic features with which the MD21
Controller is equipped.
MD21 Controller diagnostic modes include
power-up (and reset) self-test and online host-initiated diagnostic
facilities. The principal function of these tests is to determine
MD21 Controller functional integrity and to distinguish failures of
the MD21 Controller from those of the disk drive.
This section is
divided into four subsections, as listed in the following table:
Subsection
Title
6.1
Overview
6.2
Controller Reset/Power Up Initialization
6.3
Self-Test Modes
6.4
Online Diagnostic Commands
6.2 CONTROLLER RESET/POWER UP INITIALIZATION
This section describes the sequence of events during controller
initialization and self-test sequences.
The self-test sequence
occurs before the initialization sequence occurs.
6.2.1 SELF-TEST SEQUENCE
The self-test sequence will be executed only when a controller
power-up condition occurs. The self-test sequence verifies the
integrity of the hardware. This test is not an exhaustive
hardware diagnostic, but simply checks the major components for
full functionality.
If the self-test fails, the controller
will light the Error Indicator and will stop any further
initialization.
If the self-test fails, only a SCSI Bus Reset
or Power On Reset condition will restart the controller.
During the self-test, the controller will not respond to a
Selection Phase on the SCSI Bus.
Controller Initialization and Self-Test Procedures 6-1
Summary of Contents for MD21/S2
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