Controller Reset/Power üp Initialization
If the MD21 Controller is operative, green LED 1 blinks-
If the
MD21 Controller fails its self-test procedure, LED 1 does not
blink.
After the self-test procedure is successfully completed, the MD21
Controller continues with the initialization routine.
If the SCSI
interface circuits and the 8031 microprocessor are functioning, the
MD21 Controller enters the online mode and is available to the
Initiator. At this time, the Power-Up Self-Test Pass code (see
Table 6-1) is momentarily displayed by LED 1 and LED 2.
Failure of
any portion of the self-test result in a selection timeout.
6.3.2 BURN-IN MODE
During the burn-in mode, the MD21 Controller self-test procedure is
repeated continuously until a failure is detected. The MD21
Controller contains an eight-bit burn-in connector used to report
self-test failures when the MD21 Controller is operating in the
burn-in mode. The burn-in connector consists of four pin
assignments on the test connector, and four pin assignments on the
User Panel connector. The reference designators are as follows (see
Figure 6-1):
• MD21 Controller: Test connector: J5
User panel connector: J4
The burn-in connector pin assignments are shown below:
Bit
07
06
05
04
03
02
01
00
$MD21 Connector
J5-9
J5-8
J5-7
J5-12 J4-4
J4-6
J4-7
J4-9
Controller Initialization and Self-Test Procedures
6-7
Summary of Contents for MD21/S2
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