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MODE SENSE (6) / (10) Command (1Ah / 5Ah) SDLT 600 SCSI Interface Guide

4-128 January 2005 81-81200-02 REV A01

Table 4-72. Port Control MODE SENSE Page — Field Descriptions

Field Name Description

PS Parameters Savable. Not supported. Always set to 0.

SPF SubPage Format. Always set to 0. Indicates that the drive uses the page_0

page format.

Page Code Identifies the type of MODE SENSE page being transferred. A value of

19h identifies this as the Port 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 1h indicates that this mode page applies to an SPI device. For

details, see SCSI Primary Commands – 3 (SPC–3).

Synchronous

Transfer Timeout

Indicates the maximum amount of time, in 1 msec increments, that the

drive waits before generating an error by performing an unexpected bus

free operation. The drive enters the BUS FREE phase only if one of the

following events causes the timer, after it is started, not to reset or reload

before it expires.

• If there is a REQ transition when there are no outstanding REQs

waiting for an ACK, load and start the timer.

• If there is a REQ transition when there are any outstanding REQs

waiting for an ACK, there is no effect on the timer.

• If there is an ACK transition when there are outstanding REQs waiting

for an ACK, load and start the timer.

• If, after an ACK transition, there are no outstanding REQs waiting for

an ACK, stop the timer.

A value of 0000h indicates that this functionality is disabled. A value of

FFFFh indicates an unlimited timeout period.

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