Exabyte EXB-8205 Instrucciones de operaciones descargar pdf (Pagina 56)

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101

Command Complete (00h)

The CTS sends the Command Complete message to the initiator to

indicate that the execution of a command has terminated and that

valid status has been sent to the initiator. After successfully sending

this message, the CTS goes to the Bus Free phase.

Extended Message (01h)

The CTS supports only one Extended message, the Synchronous Data

Transfer Request message.

Synchronous Data Transfer Request (01h)

The Synchronous Data Transfer Request message is used to negotiate

synchronous data transfer agreements. If the initiator wants to

transfer data synchronously, it must negotiate a synchronous data

transfer agreement before transferring data.

Note: The CTS will not originate a synchronous data transfer

request. Instead, it sends a Synchronous Data Transfer

Request message in response to the initiator’s request.

A synchronous data transfer negotiation is accomplished as follows:

1. The initiator sends a Synchronous Data Transfer Request

message to the CTS. This message specifies a transfer period and

a REQ/ACK offset.

2. The CTS returns a Synchronous Data Transfer Request message.

The transfer period returned by the CTS will be equal to or

greater than the initiator’s value, and the REQ/ACK offset will

be less than or equal to the initiator’s value.

The agreement can be terminated immediately after the negotiation if

the initiator asserts the Attention signal and then sends a Message

Reject message.

Once negotiated, the synchronous transfer agreement stays in effect

with the initiator until renegotiated or until a reset condition (SCSI

bus reset, Bus Device Reset message, or power-on reset) occurs.

2-16

EXB-8205 and EXB-8505

(Standard and XL)

510503

2 SCSI Communication

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Exabyte EXB-8205 Instrucciones de operaciones Pagina 56

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