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Altera_Forum's avatar
Altera_Forum
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13 years ago

pll_lock does not lock but the pll works

Hello, If i'm not wrong pll_lock works by positive logic, so i have this problem: My PLL Works but doesn't lock, anyone knows why? http://i46.tinypic.com/11lshsg.jpg As you can see CLO...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

IIRC the pll model in Modelsim waits a very long time before locking. Try to run your simulation over a longer period of time.

Are you sure your clock input is at the correct frequency?