XVME-2 12 Manual
August, 1989
Signal
Mnemonic
BR0*-BR3*
DS0*
DSI*
DTACK*
DOO-D15
GND
Table B-l. VMEbus Signal Identification (cont’d)
Connector
and
Pin Number
lB:12-15
lA:13
lA:12
lA:16
lA:l-8
lC:l-8
lA:9,11,
15,17,19,
1 B:20,23,
lC:9
2B:2,12,
22,3I
Signal Name and Description
BUS REQUEST (O-3): Open-collector driven signals
generated by Requesters.
These signals indicate that a
DTB
master in the daisy-chain requires access to the bus.
DATA STROBE 0: Three-state driven signal that indicates
during byte and word transfers that a data transfer will
occur on data buss lines
(D00-D07).
DATA STROBE 1: Three-state driven signal that indicates
during byte and word transfers that a data transfer will
occur on data bus lines (D0-D1 5).
DATA TRANSFER
ACKNOWLEDGE:
Open-collector
driven signal generated by a
DTB
slave. The falling edge
of this signal indicates that valid data is available on the
data bus during a read cycle, or that data has been
accepted from the data bus during a write cycle.
DATA BUS (bits 0-15): Three-state driven, b&directional
data lines that provide a data path between the
DTB
master and slave.
GROUND
B-3
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