Reference Guide

Chapter 4 SCSI Commands
MODE SELECT (6) / (10) Command (15h / 55h)
DLT-S4 Interface Reference Guide 100
Figure 50 MODE SELECT (10)
Command Descriptor Block —
Data Format
Table 63 MODE SELECT (6)/
(10) Command Descriptor
Block — Field Descriptions
Figure 51 shows the format of the Mode Parameter List that the host
passes to the drive.
Bit
Byte
7 6 5 4 3 2 1 0
0 Operation Code (55h)
1 Reserved PF Reserved SP (0)
2 — 6 Reserved
7 — 8
(MSB)
Parameter List Length
(LSB)
9 Control
Note: The drive returns a CHECK CONDITION status with Sense Key
set to
ILLEGAL REQUEST if it receives an unsupported page
code or a page field with values not supported or not
changeable. In such cases, the drive does not change any
parameters as a result of a command.
Field Description
PF Page Format. Indicates that the data the host sent after the
MODE SELECT header and block descriptors complies with
the definition of pages in the SCSI-3 specification. If the Page
Format bit is set to 0, only a Mode Parameter Header and
Mode Parameter Block Descriptor may be included in the
mode parameter data.
SP Save Parameters. Must be set to 0.