Hp C737990900 Manual do Utilizador descarregar pdf (Página 24)

24 Interface Implementation

True (low) Input to the initiator

False (high) Output from the initiator

-MSG

Message Target Indicates a Message phase on the bus.

True (low) Message phase

False (high) Command, Data or Status phases

-REQ

Request Target Indicates a request for a REQ/ACK data transfer handshake.

-ACK

Acknowledge Initiator Indicates an acknowledgment for a REQ/ACK data transfer

handshake.

-ATN

Attention Initiator Indicates that the initiator has a message to send to the

target.

-RST

Reset — OR-tied signal that is used to indicate a Reset condition.

DB(15-0) Data Bus — 16 data-bit signals that, with the parity-bit signal, form the

data bus. DB15 is the most significant bit, and has the highest

priority during the Arbitration phase.

DB(P1-P0) Data Bus — Data parity bits that are set to odd, but are jumper-selectable

options. There are two discrete parity bits, one for the lower 8

data bits, the other for the upper 8 bits. Parity is not valid

during the Arbitration phase.

Signal Name Driven by Description

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 173 174

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Hp C737990900 Manual do Utilizador Página 24