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Altera_Forum's avatar
Altera_Forum
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16 years ago

PLL operating range

i am in the need to deskew or multiply the frequency of an input clock whose frequency can vary widely. the application is video where the clock can be coming in LVDS or LVTTL at clock speeds varying...
Altera_Forum's avatar
Altera_Forum
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16 years ago

well i guess the answer is there's no other way to do it. it's a pity as assuming 20MHz safe range from nominal frequency it would mean that we need to have at least 8 different settings to span up to 165 MHz. lock time is normal however to this we need to add the time required to reconfigure the PLL and add a reference clock to our system (although i agree that in most system you do have a reference clock anyway).