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Altera_Forum's avatar
Altera_Forum
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11 years ago

Fmax Improvment

I'm trying to improve Fmax in our design. See the archived quartus II proejct file in the attachment. The source files are also attached.

In my currrent design, after compilation, Fmax can reach only 141Mhz. But my target is to reach 300mhz.

Do you know how to optimize it to achieve 300mhz?

The device I'm using is Arria V 5AGXBA3D4F31C4.

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  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    11 years ago

    Instead of having lots of bits to select the offset value, why not just assign the offset value from the first set of if statements. Then you remove the whole second priority mux. 

    
if Setting_Pixel_un < (Setting_TotPixel_un/16) then
  grey_offset <= 0;
elsif <next compare> then
  grey_offset <= x"100100100";
.....
out_data <= GrayColor + grey_offset;
  • Altera_Forum's avatar
    Altera_Forum
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    11 years ago

    Hello Tricky, I have tried your code. But, it does't improve on Fmax. The worst path is still the long chain of "IF...ELSIF".