Chapter 1 - Introduction
1.2
C A R R I E R
CARD INSTALLATION
The carrier card requires the user to jumper the carrier card and attach it to the XVME PC/AT after
mounting the expansion modules. Section 1.2.1 contains information on the carrier card jumper
configuration f o r /1 and /12.
WARNING
All Xycom VME PC/AT CPU modules with functional revision levels of 4.1
or higher (functional revision levels and part numbers are located on a label
on the P1 connector) feature a 16-bit compatible PC/104 expansion site.
This PC/104 expansion site requires a new version o f the XVME-956
Modular I/O Carrier Module. I f the CPU module's functional revision level
is 4.1 or higher, use the XVME-956/12 (part number 70956-012). I f the
functional revision level is less than 4.1, use the XVME-956/2 (part number
70956-002). D o not use the XVME-956/2 on a CPU module with functional
revision levels of 4.1 or higher as this may cause damage to both modules.
1.2.1 X V M E - 9 5 6 / 1 / 1 2 Carrier Card Jumpering
Both the 956/1 and 956/12 need to be jumpered. A l l AT signals except the data lines are buffered.
Signals which are outputs from the CPU are buffered and driven directly to the input pins of the I/O
expansion module sites; such as the address bus, and the control signals. Signals which are outputs
from the I/O expansion module sites, are buffered and are connected to the CPU through jumpers; such
as the
IRQ
signals, and the
DRQ
signals.
NOTE
These jumpers, (shipped with the XVME-956), must be installed
only
if
the corresponding signal does not conflict with the CPU module.
On the following page, Table 1-1 lists the jumpers and corresponding signals of the XVME-956/1
Carrier Card. Table 1-2 lists the jumpers and corresponding signals of the XVME-956/12 Carrier
Card.
1-2
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