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Altera_Forum
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14 years ago

about external pll in lvds_rx and lvds_tx

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 co...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

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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

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Thanks dave！Our board have been made that the inclk ports are not drawn out. So i cann't use the internal pll of the lvds mega, and the internal pll of lvds mega needs a inlck to feed the pll.

I will try the external pll .

Thanks !

yu.p