Quantum DLT1/VS80 SCSI, Interface Manual

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DLT1/VS80 SCSI Interface Guide
81-81276-01 Rev A01 July 2004 4-31
4.8.4 Last n Error Events Page (07h)
The log error events page returns zero or more log parameters using the list format of the log page
which consist of ASCII text in the parameter value. The EEPROM stores a maximum of 15 log events
at a given time. Each log event stored may require more than 0XFF of ASCII text; therefore, two
parameter codes are assigned for each log event stored in EEPROM. The parameter pointer field in the
CDB specifies which parameter code the requested data should begin with.
Figure 4-18.
Log Parameters for Last n Error Events LOG SENSE Page — Data Format
Bit
Byte
7 6 5 4 3 2 1 0
4 – 5
(MSB)
Parameter Code
(LSB)
6
1 DU DS TSD ETC TMC Rsv’d LP
7 Parameter Length
8 – n
(MSB)
Hex ASCII String for Event n
(LSB)
1. The byte 6 fields are collectively referred to as the Parameter Control byte.
Table 4-17.
Log Parameters for Last n Error Events (07h) LOG SENSE Page — Field Descriptions
Field Name Description
Parameter Code Parameter code values are assigned from 0 to 29(two per log event), where 0 is the
oldest event stored and the highest parameter code returned is the most recent
event. Two parameter codes are assigned for each log entry. A parameter pointer of
0 in the CDB returns all the log events stored in the EEPROM. For example, if
only 10 log events are stored, then the parameter codes for the 10th event are
parameter codes 18 and 19. If the parameter pointer field in CDB contains 0, the
target returns parameter codes 0 to 19 to initiator. If the parameter pointer in CDB
contains 20, the target returns zero data to initiator.