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CPoir's avatar
CPoir
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6 years ago

CIC interpolator gives no output when stages are a power of 2

Hi folks, I'm trying to simulate a CIC interpolator. I noticed that when the number of stages is a power of 2 (1,2,4 or 8, since the maximum is 12), I only get zeroes as the output. Any other value ...
CPoir's avatar
CPoir
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6 years ago

Hi cpchan,

Attached is a simple test design - the one I used to capture the above screenshots. To reproduce the issue:

  1. Unzip project
  2. Open ModelSim
  3. open CIC_Example_2_tb.mpf
  4. In the TCL console: source Interpolator/simulation/mentor/simulation.tcl
  5. In the TCL console: run 120 ps

Thanks for your time looking into this issue,

Carl