Xycom XVME 200 Manual page 44

XVME-200/290 Manual
December, 1987
Table A-l. VMEbus Signal Identification (cont'd)
Connector
Signal and
Mnemonic Pin Number
BR0*-BR3* lB:12-15
D S 0 * lA:13
DSl* lA:12
IA:16
DTACK*
D00-Dl5 lA:l-8
lC:l-8
GND lA:9,11,
15,17,19,
1 B:20,23,
lC:9
2B:2,12,
22,31
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 TRANSFER
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
A-3
ACKNOWLEDGE: Open-collector