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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
1
—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
compatible as long as those terminals on the sub-bus are disabled by default and never enabled.
Caution
Damage can result if these lines are driven by the sub-bus. NI is
not
liable
for any damage resulting from improper signal connections.
1
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.
Summary of Contents for PCI-6281
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