DLT1/VS80 SCSI Interface Guide
81-81276-01 Rev A01
July 2004
4-91
Available Length
The Available Length field specifies the total number of data bytes available in the target's buffer. This
number is not reduced to reflect the allocation length, nor is it reduced to reflect the actual number of
bytes written using the WRITE BUFFER command. Following the READ BUFFER header, the target
transfers data from its data buffer.
4.14.2 Data Mode
In this mode, the DATA IN phase only contains buffer data.
4.14.3 Descriptor Mode
In this mode, the tape drive returns a maximum of 4 bytes of READ BUFFER descriptor information.
The tape drive returns the descriptor information for the buffer specified by the Buffer ID. The tape
drive does not reject the valid Buffer IDs with a CHECK CONDITION status, but returns all zeros in
the READ BUFFER descriptor.
The Offset Boundary is 12 (0Ch), indicating buffer offsets should be integral multiples of 4K.
Figure 4-62.
READ BUFFER Descriptor — Data Format
Bit
Byte
7
6
5
4
3
2
1
0
0
Offset Boundary (02h)
1 - 3
(MSB)
Buffer Capacity
(LSB)
Содержание DLT1/VS80 SCSI
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Страница 24: ...Chapter 1 Introduction 1 4 July 2004 81 81276 01 Rev A01 Notes...
Страница 32: ...Chapter 2 General SCSI Bus Operation 2 8 July 2004 81 81276 01 Rev A01 Notes...
Страница 42: ...Chapter 3 SCSI Messages 3 10 July 2004 81 81276 01 Rev A01 Notes...
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