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Chapter 10 Bus Interface

Hybrid slot-compatible defines where the device can be installed. PXI

M Series devices can be installed in the following chassis and slots:

• PXI chassis—PXI M Series devices can be installed in any peripheral

slot of a PXI chassis.

• PXI Express chassis

—PXI M Series devices can be installed in the

following PXI Express chassis slots:

– PXI-1 slots—Accepts all PXI modules

– PXI hybrid slots—Accepts PXI modules that are hybrid

slot-compatible or PXI Express modules

– PXI Express slots—Accepts PXI Express modules

PXI-1 devices use PCI signaling to communicate to the host controller

(as opposed to PCI Express signaling).

Peripheral devices are installed in peripheral slots and are not system

controllers.

Using PXI with CompactPCI

Using PXI-compatible products with standard CompactPCI products is an

important feature provided by the PXI Hardware Specification

Revision 2.1. If you use a PXI-compatible plug-in module in a standard

CompactPCI chassis, you cannot use PXI-specific functions, but you can

still use the basic plug-in device functions. For example, the RTSI bus on a

PXI M Series device is available in a PXI chassis, but not in a CompactPCI

chassis.

The CompactPCI specification permits vendors to develop sub-buses that

coexist with the basic PCI interface on the CompactPCI bus. Compatible

operation is not guaranteed between CompactPCI devices with different

sub-buses nor between CompactPCI devices with sub-buses and PXI.

The standard implementation for CompactPCI does not include these

sub-buses. The PXI M Series device works in any standard CompactPCI

chassis adhering to the PICMG CompactPCI 2.0 R3.0 core specification.

PXI-specific features are implemented on the J2 connector of the

CompactPCI bus. The PXI device is compatible with any CompactPCI

chassis with a sub-bus that does not drive the lines used by that device. Even

if the sub-bus is capable of driving these lines, the PXI device is still

For some PXI M Series devices, there are two variants—one that will work in PXI hybrid slots and one that supports local bus

for SCXI control when the device is in the right-most slot. Refer to the device specifications for more information.

National Instruments M Series User Manual

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