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Altera_Forum
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14 years ago

How do I Force Quartus to generate Multiplier from ALMs?

I'm designing in a situation where I will have limited HW multipliers on a Stratix IV (they're being used for other things). I know that Quartus knows how to generate the most efficient fixed-point ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

IIRC, if Quartus runs out of multipliers, it should start making ALM versions for you. But if you want to select which multipler will use logic, in VHDL you can use attributes: 


signal a, b : unsigned(8 downto 0); 
signal res : unsigned(17 downto 0); 
attribute multstyle : string; 
attribute multstyle of res : signal is "logic"; 
res <= a * b;