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Altera_Forum
Honored Contributor
Honored Contributorhelp on PLL input frequency
My source clock could range from 25MHz to 165MHz depending on the video format. Is there a way to ensure the PLL will lock onto it. I also need the output clock to be 90 degree shifted. I don'...
Altera_ForumHonored Contributor
Honored Contributor --- Quote Start --- so it is not what I'm looking for --- Quote End --- Seems like you are looking out for a too convenient way. I provided the link just to show, that a 1:2 lock range can be achieved for a fixed PLL setting. The other point I told is, that frequency measurement and range switching by PLL reconfiguration is required for a wider range than 1:2. I'm not aware of ready-to-use design examples for DVI or whatever your application is. But I'm sure it can be done, you just have to figure it out. Perhaps a forum member has already designed a similar solution and is willing to share it. Unfortunately I don't have it.
