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7DQGEHUJ'DWD 0HVVDJHV
7DQGEHUJ'/73URGXFW0DQXDO
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The following figure illustrates the message formats.
Bit
Byte
76543210
0 Extended Message Identifier (01h)
(see Figure 4-1)
1 Extended Message Length (02h)
2 WIDE DATA TRANSFER REQUEST (03h)
3 Transfer Width Exponent
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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.