what is the difference between NCO single-ended and NCO differential?

courtens

%00100 and %00101

ctra := %00100 << 26 + pin

ctra := %00101 << 26 + pin

JonnyMac

In the differential modes there is a "B" that is output at the opposite polarity of the main "A" pin. In your second example the "B" pin would default to pin 0. You'd still need to set dira[0] to 1 in order to see that output.

jmg

AN001 says this

          Mode                     APIN Output   BPIN  Output
%00100    NCO single-ended     =>  PHSx[31]      None
%00101    NCO differential     =>  PHSx[31]      !PHSx[31]

courtens

Thank you. This helped a lot.