ThomasTessier
Occasional Contributor
2 years agoNCSIM of PLLs not generating correct output frequency
QuartusPrime 21.1 on CentOS7. Arria5 GX.
I have a PLL which accepts 104MHz (from an upstream) and is suppose to generate 182MHz and 91MHz. That is a multiply by 7 with a divide by 8 and divide by ...
- 2 years ago
Aqid, no simulation error just the waveform frequency is incorrect. I modified the PLL to accept 104MHz but on the input I changed to multiple by 7 and divide by 2 and then changed my output stages to account for the VCO frequency difference to get the right frequencies I needed. This does simulate properly and generates the correct clocks. I cannot explain it but this was my solution and I am moving forward.