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Chapter 4 SCSI Commands

READ BUFFER Command (3Ch)

DLT-S4 Interface Reference Guide 269

Echo Buffer Descriptor

Mode (0Bh)

In this mode, the drive returns a maximum of 4 bytes of READ BUFFER

descriptor information. The drive returns the descriptor information for

the Echo Buffer. The Buffer Offset field is reserved in this mode. The

allocation length should be set to 4 or greater. The drive transfers the

lesser of the allocation length or 4 bytes of the

READ BUFFER descriptor.

Figure 132 ECHO BUFFER

Descriptor — Data Format

Figure 133 ECHO BUFFER

Descriptor — Field

Descriptions

Bit

7 6 5 4 3 2 1 0

Byte

0 Reserved EBOS

1 Reserved

2 Reserved Buffer Capacity

3 Buffer Capacity

Field Description

EBOS Echo Buffer Overwritten Supported. Set to 1 to

indicate that the drive returns the Additional Sense

Code

ECHO BUFFER OVERWRITTEN if the data being

read from the Echo Buffer is not the data previously

written by the same initiator.

Buffer

Capacity

Always returns 252, indicating the size of the Echo

Buffer.

1 2 ... 298 299 300 301 302 303 304 305 306 307 308 ... 385 386

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