Reference Guide

Chapter 4 SCSI Commands
MODE SELECT (6) / (10) Command (15h / 55h)
DLT-S4 Interface Reference Guide 130
Table 79 SAS — Port Control
MODE SELECT Page — Field
Descriptions
SAS Phy Control and
Discover Mode Subpage
(19h/01h)
4
The SAS Phy Control and Discover Mode subpage contains phy-specific
parameters.
4 — 5
(MSB)
I_T Nexus Loss Time
(LSB)
6 — 7
(MSB)
Initiator Response Timeout
(LSB)
Field Description
PS Parameters Savable. Always 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 19h identifies this
as the protocol-specific Port Control page.
Page Length Indicates the number of bytes in the page, excluding bytes 0 and 1. The length is returned
in
MODE SENSE commands and must subsequently be set to the same value when
performing
MODE SELECT.
Ready LED
Meaning
Always set to 0.
Protocol
Identifier
A value of 6h indicates that this mode page applies to an SAS-1.1 port, (see the Serial
Attached SCSI – 1. 1 (SAS-1.1) standard for specific SAS information).
I_T Nexus
Loss Time
Contains the time that the SSP target retries connection requests to an SSP initiator that
are reject with responses indicating the SSP initiator port may no longer be present before
recognizing an I_T Nexus Loss (at 2000 ms).
Initiator
Response
Timeout
Contains the time in milliseconds that the SSP target port waits for the receipt of a frame
(e.g., a write DATA frame) before aborting the command associated with that frame.
Bit
Byte
7 6 5 4 3 2 1 0