Forum Discussion

ARitt4's avatar
ARitt4
Icon for New Contributor rankNew Contributor
4 years ago

ALTMULT_ADD subtract direction

I'm trying to figure out one detail of the Quartus ALTMULT_ADD megafunction. It is set up with two pairs of inputs, dataa_0, datab_0, dataa_1 and datab_1. I understand that it multiplies dataa_0 * da...
CheepinC_altera's avatar
CheepinC_altera
Icon for Regular Contributor rankRegular Contributor
4 years ago

Hi,


As I understand it, you have some inquiries related to the subtraction of the altmult_add. For your information, as I tested with simulation, the following should be the right operation:


(dataa_1 * datab_1) - (dataa_0 * datab_0)


You may run a Modelsim simulation with your design to verify as well. Thank you.