Xycom XVME-240, Manual

Page: 56 / 73

XVME-240 Manual
October, 1984
Appendix B
VMEbus CONNECTOR/PIN DESCRIPTION
The XVME-240 Digital Input/Output module is physically configured as a non-expanded
(NEXP), double-height, VMEbus compatible board. There is one 96 pin bus connector
on the rear edge of the board labeled Pl, and one 96 pin bus connector labeled P2
(refer to Chapter 2, Figure 2-l for the locations). The pin connections for Pl contain
the standard address, data, and control signals necessary for the operation of NEXP
modules. P2 contains additional +5 volt and ground connections for the module. The
following tables identify the VMEbus signals by signal mnemonic, connector and pin
number, and signal characteristic.
Table B-l. Pl - VMEbus Signal Identification
Signal
Mnemonic
ACFAIL*
IACKIN *
IACKOUT*
AMO-AM5
A S *
A0l-A23
Connector
and
Pin Number
1B:3
1A:21
1A:22
A:23
B:16,17,
18,l9
C:14
A: 18
1A:24-30 ADDRESS bus (bits l-23) - Three-state driven
l C : 15-30 address lines that specify a memory address.
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 acknow-
ledge cycle is in progress. (Refer to Section 2.4.5.)
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.
(Refer to
Section 2.4.5.)
ADDRESS MODIFIER (bits O-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