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Altera_Forum
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18 years ago

Timing problems, Help

Hi, I designed a cordic block that has a fmax of 200 Mhz and I have a 18 bits counter that provides the angle for cordic block, this counter has a fmax of 210 Mhz. Here I don't have problems, but whe...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

Jose. As Rysc is trying to indicate, you need to provide more information about the design. Did you synthesize and fit each of the blocks seperately to get the fmax results you're indicating? Where are you getting your numbers from?

Again, as Rysc has indicated, the overall fmax of the system depends not only on the fmax of the slowest block but how the blocks are connected together.

What you need to do is focus on the combined system rather than the individual blocks. Look at the top failing paths for the system to determine what is failing. Why they are failing will probably be immediately obvious.

Jake