You can use external clocks to drive a CLIP in the same way you use other clocks your target provides. This is particularly useful if you would like to drive your CLIP with an external clock but are not able to use the external clock as an FPGA base clock (such as with the PXIe-797x modules). The variable name for the external CLIP clock changes based on which module and CLIP version you have, but can be found under the IO Module tree from the LabVIEW project window. For example, when using the NI-6585B with the 'DDR Connector' CLIP, you will use the 'DDCx_ClockIn' variable:
To use this clock in your program, you will use the same steps as mentioned in Using the IO Module Clock/Strobe Lines section from above except you will select the clock from the IO Module. For the NI-6585B using the 'DDR Connector' CLIP, it would look like this:
For some CLIPs, such as the 'DDR Connector' CLIP for the NI-6585B, you might also need to set this as the clock selection for the IO Module so that the signals are synchronized to a specific clock. The following steps show you how to do this using the NI-6585B with the 'DDR Connector' CLIP as an example:
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