Table of Contents
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Signal
Name
Message
-MSG
Request
-REQ
Acknowledge
-ACK
Attention
-ATN
Reset
-RST
DB(15-0) Data Bus
DB(P1-P0) Data Bus
24
Interface Implementation
Driven by
True (low)
False (high)
Target
Indicates a Message phase on the bus.
True (low)
False (high)
Target
Indicates a request for a REQ/ACK data transfer handshake.
Initiator
Indicates an acknowledgment for a REQ/ACK data transfer
handshake.
Initiator
Indicates that the initiator has a message to send to the
target.
—
OR-tied signal that is used to indicate a Reset condition.
—
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.
—
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.
Description
Input to the initiator
Output from the initiator
Message phase
Command, Data or Status phases
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