National Instruments PXI Express Series User Manual

Also see for NI PXIe-1062Q: User guide Installation guide

National Instruments PXI Express Series User Manual Manual pdf 22 page image

Chapter 1 Getting Started© National Instruments 1-13 NI PXIe-1062Q User ManualIf the 10 MHz clock is present on both the PXI_CLK10_IN pin of theSystem Timing Slot and the 10 MHz REF IN connector on the rear of thechassis, the signal on the System Timing Slot is selected. Refer to Table 1-2which explains how the 10 MHz clocks are selected by the backplane.A copy of the backplane’s PXI_CLK10 is exported to the 10 MHz REFOUT connector on the rear of the chassis. This clock is driven by anindependent buffer. Refer to Appendix A, Specifications, for thespecification information for the 10 MHz REF OUT signal on the rearpanel of the chassis.PXIe_SYNC_CTRLPXIe_SYNC100 is by default a 10 ns pulse synchronous to PXI_CLK10.The frequency of PXIe_SYNC100 is 10/n MHz, where n is a positiveinteger. The default for n is 1, giving PXIe_SYNC100 a 100 ns period.However, the backplane allows n to be programmed to other integers. Forinstance, setting n = 3 gives a PXIe_SYNC100 with a 300 ns period whilestill maintaining its phase relationship to PXI_CLK10. The value for n maybe set to any positive integer from 1 to 255.The system timing slot has a control pin for PXIe_SYNC100 calledPXIe_SYNC_CTRL for use when n > 1. Refer to Table B-6, XP3Connector Pinout for the System Timing Slot, for system timing slot pinout.Refer to Appendix A, Specifications, for the PXIe_SYNC_CTRL inputspecifications.Table 1-2. Backplane External Clock Input Truth TableSystem Timing SlotPXI_CLK10_INRear Chassis Panel10 MHz REF INBackplane PXI_CLK10,PXIe_CLK100 and PXIe_SYNC100No clock present No clock present Backplane generates its own clocksNo clock present 10 MHz clock present PXI_CLK10, PXIe_CLK100 andPXIe_SYNC100 all phase-locked toRear Chassis Panel—10 MHz REF IN10 MHz clock present No clock present PXI_CLK10, PXIe_CLK100 andPXIe_SYNC100 all phase-locked toSystem Timing Slot—PXI_CLK10_IN10 MHz clock present 10MHz clock present PXI_CLK10, PXIe_CLK100 andPXIe_SYNC100 all phase-locked toSystem Timing Slot—PXI_CLK10_INArtisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com