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Altera_Forum's avatar
Altera_Forum
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12 years ago

ModelSim Incorrect PLL output frequency

I have a PLL in my design that was generated using the MegaWizard tool. When I simulate my design in ModelSim, the output frequency of the PLL is not correct. I can modify the output frequency using ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

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Did you already measure the period of the Pll input clock?

it looks like your input clock is 1/6 of the period.

The input reference clock is defined as 19.2MHz in the MegaWizard tool. I verified that the reference clock in ModelSim is indeed 19.2MHz.