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Functional Description
7936 and 7937
5-46
CONTROLLER POWER ON (1)
INITIALIZE uP
STACKS~RESET
AND INITIALIZE PERIPHERAL
HARDWARE~
ROM
CHECKSUM~TEST
uP/DMA RAM CLEAR uP/DMA
RAM~NOTE:
ANY FAILURE
TO THIS POINT RESULTS IN AN INFINITE LOOP WITH NO ATTEMPT TO COME ON-
LINE. ALL THREE LEOS WILL BE IN THEIR RESET STATE (THAT IS ON).
INITIALIZE DATA STRUCTURES, VARIABLES, RAM LOGS,
REAL-T I ME CLOCK AND I NDEX PULSE
COUNTE~
FAUL T CLASS-"D I AGNOST I C"
~DRIVE
STATE-"UNSOLICITED REPORT"
SCHEDULE ALL TASKS
TEST ABI/DMA
1/0:FAIL-H2BH~TEST
DATA PATH (DMA TO/FROM HOST INTERFACE):
FAIL-H1DH -----."REPORT SERVO STATUS" (MASKING ALL BUT SPINDLE FAULTS)
WAIT:
DELAY: SEEK T.O.
15s~WAIT:
SEEK
T.O. REPORT RECEIVED, SERVO FAULT
CLEAR FAULT
"SEEK TO TARGET" UNTIL ALL 66 ENTRIES IN
SERVO FREE
~--....
SEEK TEST TABLE USED OR THERE IS A
LOAD SOSL_TEST VECTOR IN INTERRUPT
HARDWARE
~
ATTEMPT TO
SYNCHRONIZE WITH SOSL
FAULT FROM THE SERVO uP
NO
YES
FAIL
H
IS
ALREADY LOGGED
FA I L-H85H
>----1 ..
TEST SOSL INTERRUPT
1-------....
PATH:
FAIL=H18H
S7937A80
Figure 5-11.
ontroller Power On Flowchart (Sheet I of )
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