Tandberg Data
Log Sense
13-6
Tandberg SLR Product Line SCSI Functional Specifications
Overrun Log Parameters
BYTE
BIT 7
6
5
4
3
2
1
0
n+0
RESERVED
n+1
Count Basis
Cause
1
n+2
DU
DS
TSD
ETC
TMC
R
LP
n+3
Parameter Length = 02h
n+4
Buffer Overrun Counter
n+5
Table 13-5: Overrun Log Parameters
Count Basis
This field is set to 0 to indicate that the criteria for
incrementing the counter is undefined.
Cause
This field is set to 0 to indicate that the reason for
overrun is undefined.
DU
The Disable Update (DU) bit set to 0 to indicate that
the Drive is free to update the counter.
A DU bit set to 1 indicates that the Drive shall not
update the counter except in response to a LOG SELECT
command that specifies a new value for the counter.
The initiator may use the LOG SELECT command to set or
clear the DU bit.
The Drive will set the DU bit to 1 when the counter
reaches its maximum value (FFFFh).
DS
The Disable Save (DS) bit is set to 1 to indicate that
the Drive does not support saving of this log parameter.
(Note: This bit can not be changed by the initiator)
TSD
The Target Save Disable (TSD) bit is set to 1 to
indicate that the Drive does not provide any Drive-
defined method for saving of this log parameter.
(Note: This bit can not be changed by the initiator)
ETC
An Enable Threshold Comparison (ETC) bit indicates
whether comparison to the threshold value is performed
or not.
The default value is 0. See the LOG SELECT command for
further description.
TMC
The Threshold Met Criteria (TMC) field is valid only if
ETC bit is 1 and it selects one of four possible
Threshold Met Criteria.
The default value is 11b. See the LOG SELECT command for
further description.
LP
The List Parameters (LP) bit is set to 0 to indicate
that the parameter is a data counter.
(Note: This bit can not be changed by the initiator)
Parameter Length
This field is set to 02h to indicate that the counter is
2 bytes wide.
Buffer Overrun
Counter
This counter is incremented, each time, the tape Drive
has to stop a pending read operation (and thus the tape
motion) due to full data buffer.
