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Altera_Forum
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15 years ago

how to write code to realize n times frequency?

Hi,all! I want to know how to write code to realize n times frequency? There is no PLL/DLL in some CPLDs, So in this sitution I need to write a short hdl code by myself to realize the same funct...
Altera_Forum's avatar
Altera_Forum
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15 years ago

In order to multiply the frequency you need a fast oscillator (this can be done) a phase detector (this also can be done, perhaps)

and a method to modify the oscillator frequency (very difficult in FPGA).

Even if it works the performance should be very poor.

What about using an external PLL/DLL component?