Xycom XVME-400 Manual page 48

XVME-400/40l/490/491 Manual
October, 1989
Connector
and
Signal
Mnemonic Pin Number
BR0*-BR3* lB:12-15
DS0* IA:13
DSl* IA:12
DTACK* lA:16
D00-D15 lA:l-8
lC:l-8
GND
lA:9,11,
1 B:20,23,
lC:9
2B:2,12,
Table A-1. VMEbus Signal Identification (cont'd)
Signal Name and Description
BUS REQUEST (0-3): 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-D15).
DATA
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, bi-directional
data lines that provide a data path between the DTB
master and slave.
GROUND
15,17,19,
1
22,3
TRANSFER ACKNOWLEDGE:
A-3
Open-collector