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DLT1/VS80 SCSI Interface Guide
81-81276-01 Rev A01
July 2004
4-89
4.14 READ BUFFER (3Ch)
The READ BUFFER command, used in conjunction with WRITE BUFFER, serves as a diagnostic
function for testing the tape drive's data buffer and the SCSI bus integrity.
Figure 4-60.
READ BUFFER (3Ch) Command Descriptor Block — Data Format
Table 4-53.
READ BLOCK LIMITS (05h) Command Descriptor Block — Field Descriptions
Field Name
Description
LUN
Logical Unit Number. The target ignores this field. Only an IDENTIFY message
can change the LUN.
Granularity
This field indicates the reported block size granularity. The tape drive supports a
granularity of 1.
Maximum Block
Length
This field indicates the maximum block size. The tape drive supports a maximum
block length of 16,777,214 bytes (16MB – 2 Bytes).
Minimum Block Size
This field indicates the minimum block size. The tape drive supports a minimum
block length of 2 bytes.
Bit
Byte
7
6
5
4
3
2
1
0
0
Operation Code (3Ch)
1
Logical Unit Number
Reserved
Mode
2
Buffer ID
3 - 5
(MSB)
Buffer Offset
(LSB)
6 - 8
(MSB)
Allocation Length
(LSB)
9
Unused
Reserved
Flag
Link
Summary of Contents for DLT1/VS80 SCSI
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...
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