Emulex MD21/S2, Technical Manual

Page: 51 / 88

Controller Reset/Power Up Initialization
During the self-test, the onboard LEDs will indicate which
test(s) are in progress as shown in Table 6-1.
Table 6-1. LED Sequences for Self-Test Procedure
Red LED Green LED Description
OFF
OFF Hardware Reset Test
OFF
ON
8031 Test
PROM Checksum Test
Buffer Controller Test
Dynamic RAM Test
ON
OFF Disk Formatter Test
SCSI Controller Test
ON ON Self-Test Passed
If any of the tests fail, the pattern (ON or OFF) displayed by
the LEDs indicate which portion of the self-test failed.
NOTE
Due to the large amount of RAM memory on some
controllers, the power up self-test may take up
to 10 seconds to complete. During this time,
the controller will not respond to a SCSI Bus
Selection Phase.
6.2.2 INITIALIZATION SEQUENCE
The initialization sequence will be executed for any one of the
following three reasons:
• Controller Power-Up condition occurs
• SCSI Bus Reset (-RST) signal is asserted
• BUS DEVICE RESET message (on the SCSI bus) is received
• A RESET occurs if the DC voltage drops to 4.5 or less
and an INITIALIZATION sequence occurs when the voltage
returns to 4.515 or above.
Controller Initialization and Self-Test Procedures 6-3