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Valued Contributor III

A strange PLL problem

I get a strange problem! 

I use the stratix II GX with my design .It ran properly two days ago. I put my design board to a new environment the day before yesterday.It ran porperly in the first two hours.However it didn't work suddenly.The new environment is a place Bad earth.My porblerm is all the Pll in stratix II GX did not work,so the logic which drived by the pll  

did not work ,and the logic which drived by the input pin clock ran properly. 

the pll is broken

Is there any way to solve the problem?Thank you! 


my email is
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Valued Contributor III

Re: A strange PLL problem

Did you connected the pll_ena pin to high?

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