DLT1/VS80 SCSI Interface Guide
81-81276-01 Rev A01
July 2004
4-57
Figure 4-36.
Data Compression Page — Data Format
Bit
Byte
7
6
5
4
3
2
1
0
0
Rsv’d
Page Code (0Fh)
1
Page Length (0Eh)
2
DCE
DCC
Reserved
3
DDE
RED
Reserved
4 - 7
(MSB)
Compression Algorithm
(LSB)
8 - 11
(MSB)
Decompression Algorithm
(LSB)
12 - 15
Reserved
Table 4-34.
Data Compression Page — Field Descriptions
Field Name
Description
DCE
Data Compression Enable. This bit specifies whether the tape drive should enable
or disable data compression. When the DCE bit is 1, the tape drive starts in
compressed format.
DCC
Data Compression Capable. The MODE SENSE command uses this bit to indicate
that the tape drive supports hardware data compression.
DDE
Data Decompression Enable. When the tape drive reads compressed data from
medium, it automatically decompresses the data before sending it to the initiator.
Data decompression/compression is always enabled, so this bit must be 1 (enable
data decompression).
RED
Report Exception on Decompression. The tape drive does not report exceptions on
decompression (boundaries between compressed and uncompressed data). The
RED field must be 0.
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: ......