Motorola MVME712C Installation And Use Manual page 62

Interconnect Signals
3
3-8
Table 3-3. Connector J3 interconnect signals (Continued)
Pin Signal
Number Mnemonic
27-31 GND
32 ATN*
33-35 GND
36 BSY*
37 GND
PIN SIGNAL
38 ACK*
39 GND
40 RST*
41 GND
42 MSG*
43 GND
44 SEL*
45 GND
46 D/C*
47 GND
48 REQ*
49 GND
50 O/I*
Signal Name and Description
GROUND
ATTENTION - signal driven by the initiator. Indicates
the attention condition.
GROUND
BUS BUSY - OR-tied signal that indicates that the bus
is being used.
GROUND
NUMBER
ACKNOWLEDGE - signal driven by an initiator to
indicate an acknowledgment for a REQ/ACK data
transfer handshake.
GROUND
RESET - OR-tied signal that indicates the RESET
condition.
GROUND
MESSAGE - signal driven by the target during the
message phase.
GROUND
SELECT - signal used by an initiator to select a target
or by a target to reselect an initiator.
GROUND
DATA/COMMAND - signal driven by the target. It
indicates whether command or data information is on
the data bus. True (low) indicates command.
GROUND
REQUEST - signal driven by a target to indicate a
request for a REQ/ACK data transfer handshake.
GROUND
OUTPUT/INPUT - signal driven by a target which
controls the direction of data movement on the bus.
True (low) indicates input to the initiator. False (high)
indicates output from the initiator. This signal is also
used to distinguish between selection and reselection
phases.
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