Quantum DLTtape DLT 7000, Product Manual

Page: 98 / 312

Messages
4-8 Quantum DLT 7000 Tape System
4.2.6 IGNORE WIDE RESIDUE Message (23h)
The IGNORE WIDE RESIDUE message is sent by the target to the initiator to
indicate that the number of valid bytes sent during the last REQ/ACK
handshake and REQB/ACKB handshake of a DATA IN phase is less than the
negotiated transfer width. The Ignore field indicates the number of invalid data
bytes transferred. This message is sent immediately following that DATA IN
phase and prior to any other messages. Figure 4-3 illustrates the data format of
an IGNORE WIDE RESIDUE message. Table 4-6 describes the Ignore field bit
definitions.
Bit
Byte
7 6 5 4 3 2 1 0
0
Message Code (23h)
1
Ignore (01h)
Figure 4–3 IGNORE WIDE RESIDUE Message - Data Format
Table 4–6 IGNORE WIDE RESIDUE Message - Field Definition
Ignore Invalid Data Bits (16-bit Transfers)
00h Reserved
01h DB(15-8)
02h - FFh Reserved