Reference Guide

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