transiver using the internal PLL insted of ref clock

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Hi

However i have a problem with the external reference clock, and thus want to use the interal ALTPLL to drive the reference clock on the transceiver. I've read the documentation on the ref_clk input to the transceiver and it shoult be possible, but when i try i get build errors saying its not possible.

So Is this possible or not and if so how do i connect it becuase i cannot just connect the output of the interal pll to the input pin (ref_clk).

Regards

Anders

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Hi,

What is your development board? and what is the clock frequency you want from the board? I am using a Transceiver Signal Integrity board, Stratix IV GT. My experience about reference clock is that there are several clock generators on board that provide ref clk for transceiver channel with a specific frequency. Depend on your clk frequency, you assign to a corresponding clock generator PIN on the board. So, you should to refer to the board reference manual for more detail. The msg saying that it is not possible maybe because your frequency is not supported by the generator.