Wide Data Transfer Request Message (01H); Figure 4-5 Wide Data Transfer Request Message - Data Format - Quantum DLT 8000 Product Manual

4.2.16 WIDE DATA TRANSFER REQUEST Message (03h)
The following figure illustrates the message formats.
Bit 7
Byte
0
1
2
3
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.
6 5
Extended Message Identifier (01h)
Extended Message Length (02h)
WIDE DATA TRANSFER REQUEST (03h)
Transfer Width Exponent
Quantum DLT 8000 Tape System
4 3
(see Figure 4-1)
Messages
2 1 0
4-13