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Chapter 4 SCSI Commands
MODE SELECT (6) / (10) Command (15h / 55h)
DLT-S4 Interface Reference Guide
125
Figure 66
Fibre Channel
—
Logical Unit Control
MODE
SELECT
Page — Data Format
Table 75
Fibre Channel
—
Logical Unit Control
MODE
SELECT
Page — Field
Descriptions
Bit
Byte
7
6
5
4
3
2
1
0
0
PS (0)
SPF (0)
Page Code (18h)
1
Page Length (06h)
2
Reserved
Protocol Identifier (0h)
3
Reserved
EPDC (0)
4 — 7
Reserved
Field
Description
PS
Parameters Savable. Must be set to 0.
SPF
SubPage Format. Always set to 0. Indicates that this page uses the page_0 page
format.
Page Code
Identifies the type of
MODE SELECT
page being transferred. A value of 18h identifies
this as the Logical Unit Control Page.
Page Length
Indicates the number of bytes in the page, excluding bytes 0 and 1. The length is
returned on
MODE SENSE
and must subsequently be set to the same value when
performing
MODE SELECT
.
Protocol
Identifier
A value of 0h indicates that this mode page applies to an FCP-2 port (see the
Fibre
Channel Protocol – 2
(FCP–2) standard).
EPDC
Enable Precise Delivery Checking. Indicates whether the drive uses the precise
delivery function defined by the Fibre Channel standard. Must be set to 0. The drive
ignores the contents of the Command Reference Number (CRN) in the FCP
command IU.
This value is not changeable using the
MODE SELECT
command.