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Altera_Forum
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20 years ago

How to use PLL?

Hi: We all konw that Altera provides PLL,These PLLs offer clock multiplication and division, phase shifting, and programmable duty cycle and so on.But I don't know how set PLLs when I cha...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

Hi,

Due to the internal implementation of PLLs in Altera FPGA (at least for Cyclone) devices, duty cycle, phase shift, and so on, are not software programmable. You only have the ability to modify them at design time. Take a look at the Cyclone device manuals, they have included very usefull information about this subject.