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Altera_Forum
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11 years ago

Variable Precision DSP in Arria V Devices

hey folks, I am new to altera stuff. I am porting my design from xilinx devices to altera devices. In that process am facing problems with DSPs porting. I am not finding dsp in altera similar...
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Altera_Forum
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11 years ago

hey Tricky,

Thanks for reply. But if I add outside the following problems will come.

1) it will take extra LUTs

2) it may reduce frequency as we are not sure where it will place this logic. it may take luts for routing also. Instead if I can infer directly I can use dedicated routing for dsps which may increase overall freq.

As u said second solution : ( a x b + c x 1) It takes 2 dsps for multiplication, which increase overall dsps.

I tried even inferring with my logic like

d <= a x b;

out <= d+c;

In this case also also it's taking extra logic for adder.

One-way If i code directly out <= (a x b) + c it's inferring as varible dsps but i want multiplier put to be registered.