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)
Summary of Contents for DLTtape DLT1
Page 1: ...DLT1 VS80 SCSI Interface Guide...
Page 6: ...DLT1 VS80 SCSI Interface Guide vi July 2004 81 81276 01 Rev A01 Notes...
Page 12: ...Table of Contents xii July 2004 81 81276 01 Rev A01 Notes...
Page 16: ...List of Figures xiv July 2004 81 81276 01 Rev A01 Notes...
Page 20: ...List of Tables xviii July 2004 81 81276 01 Rev A01 Notes...
Page 24: ...Chapter 1 Introduction 1 4 July 2004 81 81276 01 Rev A01 Notes...
Page 32: ...Chapter 2 General SCSI Bus Operation 2 8 July 2004 81 81276 01 Rev A01 Notes...
Page 42: ...Chapter 3 SCSI Messages 3 10 July 2004 81 81276 01 Rev A01 Notes...
Page 181: ......
