Using PMOD JC and JD as single ended

I need to use PMODs JC and JD as single ended rather than differential. I have seen in these forums that people say it can be done but I have not been able to get it to work. My project works fine on JA and JB, however, it acts up when trying on the differential PMODs. I have tried different IO standards to no avail.

Any help on this matter would be greatly appreciated!

(I'm using .xdc as my constraint file)

0 Former Member over 10 years ago

Hello Drew,

The JC and JD PMOD connectors have the signals selected and routed to enable differential operation but should work in single ended mode. All four PMODs are connected to Bank 13 with VCC3V3, so they should operate in the same manner.

I would check and make sure that you have selected the pins correctly in the .xdc file, or look for another difference in the design.

-Gary
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0 Former Member over 10 years ago in reply to Former Member

I think I may have figured it out. On the documentation I am using it lists the ports JC_1-N,JC_1-P, etc.... But on the zedboard it goes -P then -N. Easy thing to miss!

Thanks!
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0 dutacristinaloredana over 9 years ago in reply to Former Member

Hi,
I have the same problem regarding JC and JD connectors as you mentioned. My PmodOLEDrgb and PmodKYPD work fine on JA and JB, but on JC and JD they don't.
I tried to modify the I/O ports in the .xdc file of the PMOD, in the sense that i changed the order ( JC_1-P first, then JC_1-N and so on), but it still doesn't work.

Is there any other mapping I have to do and I'm doing it wrong?

Best regards,
Cris
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0 jafoste4 over 9 years ago

Hello Cris,
Unfortunatly the only assistance I can offer is what was stated above.
You could also try asking over at the Digilent forum as they are the main contact for educational support. Best of luck!
--Josh
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