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Chapter 4 SCSI Commands
MODE SELECT (6) / (10) Command (15h / 55h)
DLT-S4 Interface Reference Guide
138
Table 83
Parallel SCSI
— SPI
Report Transfer Capabilities
Mode Subpage — Field
Descriptions
10
Protocol Options Bits Supported
11
Reserved
12
Reserved
13
Reserved
Field
Description
PS
Parameters Savable. For
MODE SELECT
, must be set to 0.
SPF
SubPage Format. Always set to 1. Indicates that this page uses the page_1
page format.
Page Code
Identifies the type of
MODE SELECT
page being transferred. A value of 19h
identifies this as the Port Control Page.
Subpage Code
The
SUBPAGE CODE
field indicates which mode subpage is being accessed.
Mode subpage code values are listed in SPI-5. If the parameter data of a
MODE SELECT
command contains a mode subpage formatted mode page
with the
SUBPAGE CODE
field is set to zero, the SCSI target device returns a
CHECK CONDITION
status. The sense key sets to
ILLEGAL REQUEST
and the
additional sense code set to
ILLEGAL FIELD IN PARAMETER LIST
.
Page Length
Indicates the number of bytes in the page, excluding the 4 bytes that make up
the header. The length is returned in
MODE SENSE
commands and must
subsequently be set to the same value when performing
MODE SELECT
.
Protocol Identifier
A value of 1h indicates that this mode page applies to a SPI-5 compliant port
(see the
SCSI Parallel Interface - 5
(SPI-5) standard).
Minimum Transfer
Period Factor
The
MINIMUM TRANSFER PERIOD FACTOR
field is set to the smallest value of
the transfer period factor (see SPI-5) supported by the SCSI target port.
Bit
7
6
5
4
3
2
1
0
Byte