PLL: Computing the Multiply/Divide frequencies automatically

alvieboy

By alvieboy

    • Here is a nice tool to calculate the M and D values to use with XIlinx PLL and DCM's.

Hi guys,

I just wrote a small C++ application (text-mode) that can compute the two primary configuration values for PLL (multiply and divide), given an input clock speed and the required speed. Since some of these are not possible directly using a single PLL, the application also scans for a dual-chained PLL approach, where the output from the first PLL is fed into the input of the second PLL.

These two parameters are enough for you to get a working PLL with your desired frequency.

pllwindows.png

Source code and prebuilt windows .exe available at:

http://alvie.com/zpuino/downloads/pllscan/

Enjoy :)

Alvie

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