Products > FMC112, FMC116

Setup for the FMC112 card

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paul_fitch:
Is there an example of what registers would need to be set up the AD9517 clock chip on the FMC112? I need to sample at 125 MHz using the internal VCO with no reference clock. I have been working with the chip and can see the reference clock, the VCO shows it is good at the monitor pin, but I am not getting any clocks out of the device.

arnaudNL:
Dear Paul,


We do not have a dedicated register table but we do have a software module in charge of configuring the AD9517 through the firmware. Check fmc116_clocktree.cpp in the FMC116App software source code. FMC116_clocktree_init() would be the reference function. Note that FMC116 and FMC112 are compatible in a software point of view.


I hope that helps!


Best Regards,
Arnaud

arnaudNL:
Dear Paul,


Let me know if there is anything more I can do before to close this specific topic?


Best Regards,
Arnaud

paul_fitch:
I followed the procedure that you have in the c file and it seems to work. The only issue not addressed is the CPLD setting. If I want to use the external reference with the internal VCO it looks like I write a 0x01 to location 0 of the CPLD. Is that correct?

arnaudNL:
Dear Paul,


External reference using internal clock is one of the FMC112/FMC116 application mode. When you pass a 2 to the application, the whole chip set is configured for this given mode. That argument goes down to fmc116_cpld.cpp in a FMC116_cpld_init() function.


Indeed it looks like writing a 1 to register 0 of the CPLD is the write you need to do. As far as our reference design is concerned, the CPLD register range is located at the address of FMC112/FMC116 star start's address + 0x920.


I hope that helps, and please let me know if you need any more information about that before I close the topic.


Best Regards,
Arnaud

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