Reference Guide

Chapter 4 SCSI Commands
MODE SELECT (6) / (10) Command (15h / 55h)
DLT-S4 Interface Reference Guide 127
Port Control Page (19h) 4 The Port Control Page contains the parameters that affect SCSI target port
or FCP_Port operations (For Parallel SCSI, see figure 68
; for Fibre
Channel, see figure 69
; and for SAS, see figure 70).
Figure 68 Parallel SCSI —
Port Control MODE SELECT
Page — Data Format
Table 77 Parallel SCSI — Port
Control MODE SELECT Page
— Field Descriptions
Bit
Byte
7 6 5 4 3 2 1 0
0 PS (0) SPF (0) Page Code (19h)
1 Page Length (06h)
2 Reserved Protocol Identifier (1h)
3 Reserved
4 — 5
(MSB)
Synchronous Transfer Timeout
(LSB)
6 — 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 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 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).
Synchronous
Transfer Timeout
Indicates the amount of time, in 1 msec increments, that the drive waits for an ACK
during data transfers before performing an unexpected
BUS FREE operation.