© National Instruments | 9-9
X Series User Manual
PXI Express devices can provide high-quality and high-frequency point-to-point connections
between each slot and a system timing slot. These connections come in the form of
three low-voltage differential star triggers that create point-to-point, high-frequency connections
between a PXI Express system timing module and a peripheral device. Using multiple
connections enable you to create more applications because of the increased routing capabilities.
Table 9-2 describes the three differential star (DSTAR) lines and how they are used.
The DSTAR lines are only available for PXI Express devices when used with a PXI Express
system timing module. For more information, refer to the PXI Express Specification at
www.pxisa.org.
Table 9-2. PXIe_DSTAR Line Descriptions
Trigger Line Purpose
PXIe_DSTARA Distributes high-speed, high-quality clock signals from the system
timing slot to the peripherals (input).
PXIe_DSTARB Distributes high-speed, high-quality trigger signals from the system
timing slot to the peripherals (input).
PXIe_DSTARC Sends high-speed, high-quality trigger or clock signals from the
peripherals to the system timing slot (output).
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