Exabyte EXB-8205 Betriebsanleitung PDF herunterladen (Seite 59)

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101

Initiator Detected Error (05h)

The initiator sends the Initiator Detected Error message to inform the

CTS that an error has occurred that does not preclude the CTS from

retrying the operation. Generally, the initiator sends this message

when it has detected a parity error in a non-message phase, such as

Status In or Data In. The present pointer integrity is not ensured.

Abort (06h)

The initiator sends the Abort message to the CTS to clear the present

operation. All pending data and status for the issuing initiator is

cleared and the CTS goes to the Bus Free phase. No status or ending

message is sent for the operation.

If a process is aborted, the CTS generates sense data that indicates

how the process terminated (either aborted or an error condition).

Message Reject (07h)

Either the CTS or the initiator can send the Message Reject message to

indicate that the last message received was inappropriate or has not

been implemented.

Note: If the initiator sends a Message Reject message after a

non-message phase, the CTS treats this as an error by the

initiator and aborts any processes owned by the initiator.

To indicate its intention of sending this message, the initiator must

assert the Attention signal before releasing ACK for the REQ/ACK

handshake of the message that will be rejected. When the CTS sends

this message, it changes to the Message In phase and sends this

message before requesting additional message bytes from the

initiator. This provides an interlock so that the initiator can determine

which message is rejected.

May 1994 EXB-8205 and EXB-8505

(Standard and XL)

2-19

2 SCSI Communication

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