Messages

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

7

 

6

5

 

4

3

2

1

0

Byte

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4-8

Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Ignore Wide Residue Message 23h
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DLT 7000 specifications

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