SCSI Commands

5.12READ COMMAND (08h)

This command transfers one or more data blocks or bytes to the initiator starting with the next block on the tape.

Bit

 

7

 

6

 

5

4

 

3

2

1

0

 

Byte

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

Operation Code (08h)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

Logical Unit Number

 

 

Reserved

 

SILI

Fixed

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(MSB)

 

 

 

 

 

 

 

 

 

 

2 - 4

 

 

 

 

 

 

Transfer Length

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(LSB)

5

 

Unused

 

 

 

 

Reserved

 

Flag

Link

 

 

 

 

 

 

 

 

 

 

Figure 5–61

READ Command Descriptor Block - Data Format

 

 

 

 

Table 5–61

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 target terminates the command with CHECK CONDITION status, sense key set

 

 

to ILLEGAL REQUEST, and additional sense code of INVALID FIELD IN CDB.

 

 

If the SILI bit is 0 and the actual block length is different than the specified transfer length, a CHECK CONDITION status is returned. Within the sense data, the Incorrect Length Indicator (ILI) bit and Valid bit will be set to 1. The sense key field specifies 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 tape is logically positioned after the block (EOM side).

5-128

Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Read Command 08h, Sili
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