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READ BUFFER Command (3Ch) SDLT 600 SCSI Interface Guide

4-188 January 2005 81-81200-02 REV A01

4.17.6 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 4-98. ECHO BUFFER Descriptor — Data Format

Bit

Byte

7 6 5 4 3 2 1 0

0 Reserved EBOS

1 Reserved

2 Reserved Buffer Capacity

3 Buffer Capacity

Table 4-109. ECHO BUFFER Descriptor — Field Descriptions

Field Name 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 ... 225 226 227 228 229 230 231 232 233 234 235 ... 293 294

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Quantum 1200 Series DAT Autochanger Guía de usuario Pagina 230