MAINTENANCE AND SERVICING M2488 PRODUCT GUIDE
8-4 CG00000-011503 REV. A April 1997
8-3 SENSE DATA
The sense bytes, contained in the controller, indicate error, status, and statistical information about the
controller or the drive. Error information is set in the sense bytes when the CHECK CONDITION status
is reported as a completion status. The sense bytes are transmitted to an initiator by the REQUEST
SENSE command.
8-3.1 Error Code Sense Format
An Error Code (EC) of 70h (sense byte 0 of 70h or F0h) indicates that the CHECK CONDITION sta-
tus returned is a result of an error or exception condition on the command that returned the CHECK
CONDITION status.
Error code 71h (sense byte 0 of 71h or F1h) indicates the CHECK CONDITION status returned is the
result of an error or exception condition not related to the command that returned the CHECK CON-
DITION STATUS (i.e., deferred error). After detecting a deferred error condition on a logical unit,
the controller reports CHECK CONDITION status to the next initiator attempting to access that log-
ical unit.
The following tables and text define the sense data and log data returned to the initiator in the data
phase of the REQUEST SENSE command.
Table 8-1. Error Code 70 - Sense Format (on current command)
BITS
BYTES 76543210
0
Valid 1 1 1 0 0 0 0
1
Segment Number (00h)
2
FMark EOM ILI Rsvd Sense Key
3-6
Information Bytes
7
Additional Sense Length = 24h
8-11
00000000h (SCSI-2 Command Specific Information Bytes)
12
Additional Sense Code
13
Additional Sense Code Qualifier
14
FRU Code (00h)
15
SKSV C/D Rsvd Rsvd BPV Bit Pointer
16-
17
MSB
Field Pointer
LSB
18
Format of additional sense
19
Host ERPA
20-43
Additional Sense Bytes as Defined by the Format Indicated in Byte 18.
