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refclk of alt2gxb must be a differential clock input?

Altera_Forum
Honored Contributor II
‎08-24-2011 01:58 PM
821 Views

use refclk0 to drive transmitter's tx_pllclk, must refclk0 be a differential clock? 

but if use a global clock to train the transmitter's pll, it seems to right. 

anybody can help me....
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