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Interconnect Signals
Table 3-3. Connector J3 Interconnect Signals (Continued)
Pin Number
3
19-24
25
26
27-31
32
33-35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
3-8
Signal
Mnemonic
GND
GROUND
Not used.
TERMPWR
TERMINATOR POWER (fused on the P2 adapter)
GND
GROUND
ATN*
ATTENTION - signal driven by the initiator. Indicates
the attention condition.
GND
GROUND
BSY*
BUS BUSY - OR-tied signal that indicates that the bus is
being used.
GND
GROUND
ACK*
ACKNOWLEDGE - signal driven by an initiator to
indicate an acknowledgment for a REQ/ACK data
transfer handshake.
GND
GROUND
RST*
RESET - OR-tied signal that indicates the RESET
condition.
GND
GROUND
MSG*
MESSAGE - signal driven by the target during the
message phase.
GND
GROUND
SEL*
SELECT - signal used by an initiator to select a target or
by a target to reselect an initiator.
GND
GROUND
D/C*
DATA/COMMAND - signal driven by the target. It
indicates whether command or data information is on
the data bus. True (low) indicates command.
GND
GROUND
REQ*
REQUEST - signal driven by a target to indicate a
request for a REQ/ACK data transfer handshake.
GND
GROUND
Signal Name and Description
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