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Altera_Forum
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14 years ago

Stratix IV GXB Refclk IO standard settings

Hi there, I am trying to set the IO standard for a refclk input for a GXB bank in Stratix IV EP4SGX230KF40F1517 by using the following constraint: set_instance_assignment -name IO_STANDARD...
Altera_Forum's avatar
Altera_Forum
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14 years ago

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This works fine. In some cases you'll get a warning about the possibility of increased jitter (I think it was due to cascading of PLLs).

Try it on the board and see how you go.

Cheers,

Dave

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That's what I did in the compiled project and got those fitting errors. Is there any other constraints I need to add to make it work?

Thanks,

Hua