about external pll in lvds_rx and lvds_tx

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i am new to lvds mega in quartus . i wanna know that what is the difference between using internal pll and external pll,since there is an option in the lvds_tx, lvds_rx general pannel. which kind configuration is easier and more stable? and my device is ep2c35.

thanks !

yu.p

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Use the internal PLL unless you need to dynamically controller the PLL parameters. The default configuration takes care of the timing analysis constraints.

Cheers,

Dave