
Tandberg Data
Mode Select
14-28
Tandberg SLR Product Line SCSI Functional Specifications
Test Flag Number
When the TEST bit is set to 0, the Test Flag Number
field must always be set to zero.
When the TEST bit set to 1, and the Test Flag Number
field is non-zero, the drive will generate/clear a test
informational exception condition. The test action is
based on the Test Flag Number value. Valid values of the
Test Flag Number are –64 to –1, 1 to 64 and 32767
(7FFFh). Positive numbers will generate the
corresponding condition, while negative numbers will
clear the corresponding condition. Negative numbers are
represented using the 2’s complement method. If the Test
Flag Number is set to an invalid value, the MODE SELECT
command will return CHECK CONDITION, with sense key set
to Illegal Request and extended sense set to Invalid
Field in Parameter List. A Test Flag Number of zero is
illegal with the TEST bit set to 1.
0:
This value is illegal and will result
in CHECK CONDITION.
1 to 64:
Generate an informational exception
condition by setting the
corresponding TapeAlert flag in the
TapeAlert Information log page. Once
the TapeAlert flag is set, it is
processed normally based on the
DExcpt, MRIE, Interval Count and
Report Count values. Any real
information exception conditions will
not be flagged unless the flag is
cleared with a new Mode Select, by
performing the appropriate corrective
action or if the flag is cleared with
a Log Select Resetting all Log
Parameters.
-1 to –64:
Clear an informational exception
condition by clearing the TapeAlert
flag corresponding to the absolute
value of the Test Flag Number.
Clearing the flag in this way is
equivalent to performing the
specified corrective action for that
flag, thus allowing a real
information exception condition to be
set if the real error condition
occurs for that flag.
32767:
Generate all informational exception
conditions supported by the drive by
setting all the corresponding
supported TapeAlert flags. Once the
supported TapeAlert flags are set
they are processed the same way as if
a single flag was set.