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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.
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I have the same board although its with a Stratix V. however it is as rameshrai points out "Not simple enough", and i'm developing to a system where, if it is possible, i can leave thoes clock generators out. Simple design, simple PCB routing.
Regards Anders
Honored Contributor
