about external pll in lvds_rx and lvds_tx

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You should really read the altlvds MegaCore users guide:

http://www.altera.com/literature/ug/ug_altlvds.pdf

and simulate the component in Modelsim. Getting it to work there will show you what the clocks need to be.

Cheers,

Dave

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Thanks Dave!

i have almost tried every option to apply altlvds, i recived the data,but the data and the clock had some phase difference. And at last, I gave up the altlvds, and wrote one by myself. Now ,it works well.

Thanks again!

yu.p