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william7's avatar
william7
Icon for New Contributor rankNew Contributor
3 years ago

PLL clock output for SDRAM is not connected

I'm mapping my VHDL design to Cyclone IV device. The SDRAM clock is derived from altpll's 2nd clock output. The compilation generates a warning message:

Warning (15899): PLL "clkgen:clkgen0|cyclone_clkgen:\c4:cyc0|cyclonepll:sdclkpll|altpll:\nosd:altpll0|altpll_3p21:auto_generated|pll1" has parameters clk1_multiply_by and clk1_divide_by specified but port CLK[1] is not connected

I check the design to make sure the CLK[1] is surely connected to the output by the following mapping:

sdclk_pad : outpad generic map (2) port map (sdclkl, sdclk);
However, sdclk output is broken when looking into the RTL view:

And the output pin is connected to invalid

How could I fix this mapping problem?

Thanks

2 Replies

  • Farabi's avatar
    Farabi
    Icon for Regular Contributor rankRegular Contributor
    3 years ago

    Hello,


    To debug this, we need a sample case from you. Could you please send us the sample case so we can take a look into this?


    regards,

    Farabi


  • AqidAyman_Altera's avatar
    AqidAyman_Altera
    Icon for Regular Contributor rankRegular Contributor
    3 years ago

    As we do not receive any response from you on the previous question/reply/answer that we have provided, please login to ‘https://supporttickets.intel.com’, view details of the desire request, and post a feed/response within the next 15 days to allow me to continue to support you. After 15 days, this thread will be transitioned to community support. The community users will be able to help you on your follow-up questions.