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SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands

81-81200-02 REV A01 January 2005 4-89

4.9.8 Logical Unit Control Page (18h)

The Logical Unit Control Page contains the logical unit control parameters for READ and WRITE

operations.

Figure 4-51. Logical Unit Control MODE SELECT Page — Data Format

Bit

Byte

7 6 5 4 3 2 1 0

0 PS SPF (0) Page Code (18h)

1 Page Length (06h)

2 Reserved Protocol Identifier (1h)

3 – 7 Reserved

Table 4-53. Logical Unit Control MODE SELECT Page — Field Descriptions

Field Name Description

PS Parameters Savable. Not supported. Must be 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 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. If the drive receives an

unexpected page length value, it returns a CHECK CONDITION status,

Sense Key set to ILLEGAL REQUEST.

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).

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Quantum 1200 Series DAT Autochanger Guía de usuario Pagina 131