Exabyte EXB-8205 Instruções de Operação descarregar pdf (Página 405)

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Message Processing in Data In Phase (READ Command)

Figure D-9 shows how messages are processed during the Data In

phase of a READ command (that is, when the initiator asserts the

Attention signal while it is receiving user data from the CTS).

Parity Error in Data Associated with READ Command

If the initiator detects a parity error in data transferred from the CTS

during a READ command, it should assert the Attention signal. This

causes the CTS to stop the data transfer. The initiator should then

send an Initiator Detected Error message to the CTS.

When it receives the Initiator Detected Error, the CTS assumes that a

parity error has occurred and aborts the data transfer. The CTS is

positioned at the start of the next block.

After aborting the data transfer, the CTS sends Check Condition

status to the initiator followed by a Command Complete message.

The sense key is set to Aborted Command (Bh), and the ASC and

ASCQ are set to 47h and 00h. The SCSI Bus Parity Error bit is set to 1.

In fixed-block mode, the Information bytes contain the number of

blocks not sent to the initiator.

The initiator should backspace n blocks and attempt to reread the

blocks by reissuing the READ command.

May 1994 EXB-8205 and EXB-8505

(Standard and XL)

D-19

Appendix D SCSI Bus Message Processing and Error Recovery

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