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Altera_Forum
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11 years ago

ALTSHIFT_TAPS and timing issue

I am having some problems going from simulation to synthesis in my design. The simulation works fine while the synthesized and fitted design does not. I have written a test bench to synthesize a t...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

The same problem reared its head in the 12 multiplier version. A silly mistake on my behalf.

I took the 12 multiplier outputs and wrote

assign res = prod1 + prod2 + prod3 + prod4 + prod5 + prod6 + prod7 + prod8 + prod9 + prod10 + prod11 + prod12;

This create a silly combinational path.

I used PARALLEL_ADD instead and Voila!