
ACE1553-3U-4 Hardware Manual
17
4
PXI-EXPRESS INSTRUMENTATION BUS
About the PXIe Standard
4.1
PCI Express was introduced to improve upon the PCI bus platform. The most notable PCIe
advancement over PCI is its point-to-point bus topology. The shared bus used for PCI is
replaced with a shared switch, which provides each device its own direct access to the bus.
Unlike PCI, which divides bandwidth between all devices on the bus, PCIe provides each device
with its own dedicated data pipeline. Because the cPCIe/PXIe backplane integrates PCI
Express while still preserving compatibility with current PXI modules, users benefit from
increasing bandwidth while maintaining backward compatibility with existing systems. PXIe
specifies PXIe hybrid slots to deliver signals for both PCI and PCIe.
Figure 4.1: PXI architecture
PXIe combines industry-standard PC components, such as the PCI-Express bus, with advanced
triggering and synchronization extensions on the backplane, backward compatible with the PXI
triggering and synchronization bus.
The PXI-functions can be controlled via the API interface.
10 MHz
Clock
PXI BUS CAPABILITIES
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PXI Trigger Bus (8 TTL Triggers)
Содержание ACE1553-3U-4
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