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SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands

81-81200-02 REV A01 January 2005 4-153

4.14 READ Command (08h)

The READ command transfers one or more data blocks or bytes to the initiator starting with the next

block on the tape.

Figure 4-83. READ Command Descriptor Block — Data Format

Bit

Byte

7 6 5 4 3 2 1 0

0 Operation Code (08h)

1 Reserved SILI Fixed

2 – 4

(MSB)

Transfer Length

(LSB)

5 Control

Table 4-88. READ Command Descriptor Block — Field Descriptions

Field

Name Description

SILI Suppress Incorrect Length Indicator. If the SILI bit is set to 1 and the Fixed bit is

set to 1, the drive terminates the command with CHECK CONDITION status,

Sense Key set to ILLEGAL REQUEST, and Additional Sense Code set to

INVALID FIELD IN CDB.

If the SILI bit is set to 0 and the actual block length is different than the specified

transfer length, the drive returns CHECK CONDITION status. Within the Sense

Data, the Incorrect Length Indicator (ILI) bit and Valid bit are set to 1. The Sense

Key field is set to NO SENSE. The information bytes are set to the difference

(residue) between the requested transfer length and the actual block length, or, in

Fixed Block mode, the difference (residue) between the requested number of

blocks and the actual number of blocks read. No more than Transfer Length

blocks are transferred to the initiator and the drive logically positions the tape

after the block (EOM side).

SDLT 600

SCSI Interface Guide

SCSI Commands

81-81200-02

REV A01

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