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Service Information
7957 A/7958A
Compressed ESDI status:
bit 0
write fault
bit 1
write gate with track offset
bit 2
=
seek fault
bit 3
=
invalid or unimplemented command
bit 4
=
interface fault
bit 5
=
command data parity fault
bit 6
=
power on conditions exist
bit 7
spindle motor stopped
Disc Controller IC Status Register:
bit
0
header fault
bit
1
next disc command
bit
2 =
header match completed
bit
3
=
local request
bit
4 =
remote command busy
bit
5
=
local command busy
bit
6 =
correction cycle active
bit
7
=
error detected
Disc Controller IC Error Register:
bit
0
header failed although sector matched
bit
1
data field error
bit
2 =
sector not found
bit
3 =
sector overrun
bit
4
=
no data sync
bit
5
=
FIFO data lost
bit
6
correction fai led
bit
7
late interlock
Vendor Unique status:
Only the least significant byte of the first word of vendor unique status is
sa ved. This inf orma tion is not a vaila ble to the field.
4-44.
Physical Address Reporting
Faults will normally be reported with a logical address as is shown in paragraph
4-53. If the seek preceding the occurrence of the fault was a physical seek then
the current logical cylinder and target logical cylinder will be replaced by a
current physical cylinder and a target physical cylinder. The exercisers and test
systems are informed of the switch by setting the most significant bit of the
cylinder address.
4-45.
Run Time Sectors Read Count (Media and EEPROM Based)
The CEC PCA-A2 maintains an estimate of the number of sectors read during
run time (Le., not utility or diagnostic) commands. An estimate of the number of
sectors read per head is returned to the host in the header of the read run time
log execution message.
4-27
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