Tandberg Data SLR7-140 PROGRAMMER Manual page 198

BYTE BIT 7
n+0 Parameter Code = 0004h
n+1
n+2 DU
n+3 Parameter Length = 02h
n+4 Read Servo Lock Lost Counter
n+5
Table 13-48:
Parameter Code
DU
DS
TSD
ETC
TMC
LP
Parameter Length
Read Servo Lock
Lost Counter
Tandberg Data
Read Servo Lock Lost Log Parameters
6 5
DS TSD
Read Servo Lock Lost Counter Log Parameters
The Parameter Code is set to 0004h.
A Disable Update (DU) bit set to 0 indicates 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).
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)
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)
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.
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.
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)
This field is set to 02h.
The Read Servo Lock Lost Counter is incremented when the
head servo has lost servo lock during read operation.
The servo lock is considered to be lost if the tracking
error exceeds allowed maximum value (This can for
example happen, when the Drive is exposed to an external
mechanical shock).
13-51 Tandberg SLR Product Line SCSI Functional Specifications
4 3
ETC TMC
Log Sense
2 1 0
R LP