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Messages

4-12 Quantum DLT 8000 Tape System

4.2.15 SYNCHRONOUS DATA TRANSFER REQUEST Message (01h)

NOTE

The tape drive supports initiating synchronous transfer negotiations with the host,

but this feature is disabled by default. To enable it, set the MODE SELECT VU

ERROM parameter EnaInitSyncNeg.

This extended message allows the target and initiator to agree on the values of the

parameters relevant to synchronous transfers. The tape drive will not initiate the

Synchronous Data Transfer Request message; it relies on the initiator to do so. The

Synchronous Data Transfer Request command has the format shown in Figure 4-4.

Bit

Byte

7 6 5 4 3 2 1 0

0 Extended Message Identifier (01h)

(see Figure 4-1)

1 Length (03h)

2 Message Code (01h)

3 Transfer Period: Min. = 25 (19h) (equals 100 ns)

4 Transfer REQ/ACK Offset: Max. = 15

Figure 4–4 Synchronous Data Transfer Request Message — Data Format

1 2 ... 137 138 139 140 141 142 143 144 145 146 147 ... 407 408

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