HP C737990900 - Manual (Page 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