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Altera_Forum's avatar
Altera_Forum
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16 years ago

Altpll using output frequency

Dear, When compiling a simple project with the attached pll as a toplevel i get the following error because i try to use output frequence parameter in stead of device and multiply parameters. ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Judging by your own work I can say:

The frequency parameter need to be converted to PLL parameters of mult/div and not the other way round. PLLs ar based on these figures for their internal counters. Frequency entry is just a user convenience.

You will need to convert frequency manually to mult/div factors if you don't want GUI. Remember not all frequencies are possible. Only those that fit the mult/divide values.