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PROMA's avatar
PROMA
Icon for New Contributor rankNew Contributor
6 years ago

Cyclone 10 LP PLL output to pin assignment

I have a design with a Cyclone10 LP that needs to talk to a RGMII PHY, which expects a clock signal.

I use a PLL to generate a 125 MHz clock, and would now like to route that to an output pin which is PLL4_CLKOUTp.

The fitter returns me the following warning:

Warning (15064): PLL "PLL_Cy10LP:PLL_inst|altpll:altpll_component|PLL_Cy10LP_altpll:auto_generated|pll1" output port clk[3] feeds output pin "SC3_ETH0_TX_CLK~output" via non-dedicated routing -- jitter performance depends on switching rate of other design elements. Use PLL dedicated clock outputs to ensure jitter performance

Do you have any idea on how to solve this warning?

1 Reply

  • AnandRaj_S_Intel's avatar
    AnandRaj_S_Intel
    Icon for Regular Contributor rankRegular Contributor

    Hi Pannet,

    If you have connected to Pll output pin to PLL4_CLKOUTp.

    You can ignore the warning.

    Regards

    Anand