Synchronous Data Transfer Request (01H); Figure 4 Synchronous Data Transfer Request Message - Quantum SuperLoader DLT User Manual

Synchronous Data
Transfer Request
2
(01h)
Figure 4 Synchronous
Data Transfer Request
Message
Bit
Byte 7
0
1
2
3
4
This extended message allows the target and initiator to agree on
the values of the parameters relevant to synchronous transfers. The
SuperLoader will not initiate the SYNCHRONOUS DATA
TRANSFER REQUEST message; it relies on the initiator to do so.
The SYNCHRONOUS DATA TRANSFER REQUEST message has
the format shown in
The SuperLoader DLT supports initiating synchronous
Note:
transfer negotiations with the host, but this feature is
disabled by default. To enable it, set the MODE SELECT
VU EEROM parameter EnaInitSyncNeg.
6 5
Extended Message Identifier (01h) (see

SYNCHRONOUS DATA TRANSFER REQUEST (01h)

Transfer REQ/ACK Offset
A SYNCHRONOUS 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
Quantum ATL SuperLoader Software Interface Guide
figure 4.
4 3
Length (03h)
Transfer Period
Chapter 2 Messages
Supported SCSI Messages
2 1
figure 1)
0
21