XVME-212 Manual
August, 1989
Appendix B
VMEbus
CONNECTOR/PIN DESCRIPTION
The XVME-212 Processor Module is a double-high VMEbus compatible board. There is
one 96-pin bus connector on the rear edge of the board labeled Pl (refer to Chapter 2,
Figure 2-I for the location). The signals carried by connector PI are the standard address,
data, and control signals required for a Pl backplane interface, as defined by the VMEbus
specification. Table B-l identifies and defines the signals carried by the PI connector.
Table B-l. Pl - VMEbus Signal Identification
Signal
Mnemonic
ACFAIL*
IACKIN*
IACKOUT*
AM0-AM5
A S *
Connector
and
Pin Number
lB:3
IA:21
1A:22
1A:23
lB:16,17,
18,19
lC:14
lA:18
Signal Name and Description
AC FAILURE: Open-collector driven signal which
indicates that the
AC
input to the power supply is no
longer being provided, or that the required input voltage
levels are not being met.
INTERRUPT ACKNOWLEDGE
IN: Totem-pole driven
signal. IACKIN and IACKOUT signals form a daisy-
chained acknowledge. The IACKIN signal indicates to
the VME board that an acknowledge cycle is in progress.
INTERRUPT ACKNOWLEDGE OUT: Totem-pole driven
signal. IACKIN and IACKOUT signals form a daisy-
chained acknowledge. The IACKOUT signal indicates to
the next board that an acknowledge cycle is in progress.
ADDRESS MODIFIER (bits 0-5): Three-state driven lines
that provide additional information about the address bus,
such as: size, cycle type, and/or DTB master identification.
ADDRESS STROBE: Three-state driven signal that
indicates a valid address is on the address bus.
B-l
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