HP 220mx Guia do Utilizador descarregar pdf (Página 25)

100

101

SCSI Command Overview

Drive Control Commands

Chapter 11-6

Command Complete 00H

This message is sent from the target 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 target

goes to the Bus Free Phase by releasing BSY (Busy).

Extended Message 01H

This message is sent from either the initiator or the drive to indicate that

the message is an extended message. The drive supports only the

synchronous data transfer request (SDTR) message.

An SDTR message exchange will be initiated by a SCSI device when an

arranged data transfer agreement becomes invalid. The agreement

becomes invalid after an intermediate status such as:

• Hard reset condition

• BUS DEVICE RESET message

• Wide data transfer message

•Power cycle

The initiator may also initiate a SDTR message exchange when

appropriate to negotiate a new data transfer agreement (synchronous or

asynchronous).

Table 1-2 Extended Message Format

Byte 7 6 5 4 3 2 1 0

0 Extended Message (01H)

1 Extended Message Length (03H)

2 Synchronous Data Transfer Request Code (01H)

3 Transfer Period Factor (m times 4 nanoseconds)

4 REQ/ACK Offset (x)

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 377 378

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HP 220mx Guia do Utilizador Página 25

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