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Messages
Quantum DLT 8000 Tape System
4-13
4.2.16 WIDE DATA TRANSFER REQUEST Message (03h)
The following figure illustrates the message formats.
Bit
Byte
7
6
5
4
3
2
1
0
0
Extended Message Identifier (01h)
(see Figure 4-1)
1
Extended Message Length (02h)
2
WIDE DATA TRANSFER REQUEST (03h)
3
Transfer Width Exponent
Figure 4–5 Wide Data Transfer Request Message — Data Format
A WIDE DATA TRANSFER REQUEST Message exchange is initiated by a SCSI device
whenever a previously arranged transfer width agreement may have become invalid. The
agreement becomes invalid after any condition that may leave the data transfer
agreement in an indeterminate state such as
•
After a hard reset condition
•
After a BUS DEVICE RESET Message
•
After a power cycle.
The WIDE DATA TRANSFER REQUEST Message exchange establishes an agreement
between two SCSI devices on the width of the data path to be used for DATA phase
transfer between them. This agreement applies to DATA IN and DATA OUT phases
only. All other information transfer phases must use an 8-bit data path.
Summary of Contents for DLTtape DLT 8000
Page 1: ...DLTTM 8000 Tape System Product Manual Nov 10 2003 81 60118 06...
Page 5: ...USER MANUAL STATEMENTS FOR CLASS B EQUIPMENT continued...
Page 6: ......
Page 26: ...Table of Contents xxiv Quantum DLT 8000 Tape System...
Page 36: ...About This Manual Quantum DLT 8000 Tape System xxxii...
Page 54: ...General Description and Specifications 1 18 Quantum DLT 8000 Tape System...
Page 102: ......
Page 372: ......
Page 376: ...Appendix A Definition of Vendor Unique Sense Data Information A 4 Quantum DLT 8000 Tape System...
Page 386: ...Appendix C Updating the Firmware C 6 Quantum DLT 8000 Tape System...
Page 396: ...Appendix E Visual Inspection Procedure for DLTtape Cartridges E 8 Quantum DLT 8000 Tape System...
Page 406: ...Appendix G DLT 7000 Emulation Feature G 8 Quantum DLT 8000 Tape System...
Page 407: ......