National Instruments PXIe-1092 User Manual

Also see for PXIe-1092: Installation guide CALIBRATION PROCEDURE

common reference clock signal to synchronize multiple modules in a measurement or controlsystem.An independent buffer drives PXIe_CLK100 to each peripheral slot. These clocks are matchedin skew to less than 100 ps. The differential pair must be terminated on the peripheral withLVPECL termination for the buffer to drive PXIe_CLK100 so that when there is no peripheralor a peripheral that does not connect to PXIe_CLK100, there is no clock being driven on thepair to that slot. Refer to the following figure for a termination example.An independent buffer drives PXIe_SYNC100 to each peripheral slot. The differential pairmust be terminated on the peripheral with LVPECL termination for the buffer to drivePXIe_SYNC100 so that when there is no peripheral or a peripheral that does not connect toPXIe_SYNC100, there is no SYNC100 signal being driven on the pair to that slot.In summary, PXI_CLK10 is driven to every slot. PXIe_CLK100 and PXIe_SYNC100 aredriven to every peripheral slot.PXI_CLK10, PXIe_CLK100 and PXIe_SYNC100 have the default timing relationshipdescribed in the following figure.Figure 6. System Reference Clock Default BehaviorPXIe_CLK100PXI_CLK10PXIe_SYNC1000 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9To synchronize the system to an external clock, you can drive PXI_CLK10 from an externalsource through the PXI_CLK10_IN pin on the System Timing Slot, or from an external SMAconnector on the rear of the chassis (Timing and Synchronization upgrade). When an externalclock is detected, the backplane automatically phase-locks the PXI_CLK10, PXIe_CLK100,and PXIe_SYNC100 signals to this external clock and distributes these signals to the slots.Refer to the PXIe-1092 Specifications section for the specification information for an externalclock provided on the PXI_CLK10_IN pin of the System Timing Slot or rear panel SMA.Installation and ConfigurationThe following section describes how to prepare and operate the PXIe-1092 chassis.Before connecting the chassis to a power source, read this section and the Read Me First:Safety and Electromagnetic Compatibility document included with your kit.12 | ni.com | PXIe-1092 User Guide