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101

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.

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