Quantum ProDrive 40S - Page 86

Section 5
SCSI Programming Guidelines
EEC
PER
DTE
DCR
Descril!tioD
0 0
0 0
Nonnal error recovery procedure. Read retries are attempted until
good data is read, a stable syndrome is obtained,
or the retry count
is exhausted. ECC is invoked
if needed when correction is
possible. Complete data
transfer occurs unless an uncorrectable
error
is encountered. Only uncorrectable errors are reported.
0
0
0
Same
as (0,0,0,0) except no ECC correction is attempted. If read
retries
are not successful, data transfer is stopped and an
unrecoverable error is reported.
0
0
1
0
Invalid Request
0
0
Invalid Request
0
0 0 Same
as (0,0,0,0) except all data errors (recoverable and
unrecoverable)
are reported. A recoverable error is reported after
the data transfer is completed.
0
0 Same
as (0,0,0,0) except all data errors are reported. A data error
recovered via
read retries is reported after the data transfer is
completed.
0 1
0 Read retries are attempted until good data is read, stable syndrome
is obtained, or the retry count is exhausted. If needed, ECC is
invoked if correction is possible. Data transfer is stopped upon
error detection and
all data errors are reported.
0
1
Same as (0,1,1,0) except no ECC correction is attempted. If read
retries are not successful, the error
is reported as unrecoverable.
0
0 0
ECC is invoked immediately if correction is possible. If error is
uncorrectable, read retries
are attempted until good data is read, a
stable syndrome is obtained, or the
retry count is exhausted.
Complete data transfer
occUrs unless an unrecoverable error is
encountered. Only unrecoverable errors are reported.
1
0 0 1 Invalid Request
1
0
0
Invalid Request
1
0 1
Invalid Request
I 1
0 0
Same
as (1,0,0,0) except all data errors are reported. A recoverable
error is reported after the data transfer is completed.
I 1
0
1
Invalid Request
1
1
1 .
0
Same
as (1,0,0,0) except data transfer is stopped upon error
detection (recoverable and unrecoverable) and
all data errors are
reported.
1
1
1
Invalid Request
5·46 SCSI Programming Guidelines