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paul26's avatar
paul26
Icon for New Contributor rankNew Contributor
2 years ago

Timing violation while integrating 2 display port example designs

Hi,

I have generated an example design for display port which compiled successfully. As we are dealing with 2 display ports i made a second instantiation of the same example top. this time i got a timing violation in the following path, which I could not solve. But the project is working fine when I test in the board. Can you please help me to solve this timing violation?

Here is the details of timing violation

ex:

Critical Warning: Unexpected timed setup path
From: top_dp|tx_phy_top_i|gxb_tx_i|gxb_tx|g_xcvr_native_insts[0].ct2_xcvr_native_inst|inst_ct2_xcvr_channel_multi|gen_rev.ct2_xcvr_channel_inst|gen_ct1_hssi_pldadapt_tx.inst_ct1_hssi_pldadapt_tx|pld_pcs_tx_clk_out2_dcm
To: top_dp2|tx_phy_top_i|gxb_tx_i|gxb_tx|g_xcvr_native_insts[0].ct2_xcvr_native_inst|inst_ct2_xcvr_channel_multi|gen_rev.ct2_xcvr_channel_inst|gen_ct1_hssi_pldadapt_tx.inst_ct1_hssi_pldadapt_tx~pld_tx_clk2_dcm.reg
Source Clock: top_dp|tx_phy_top_i|gxb_tx_i|tx_clkout2|ch0
Destination Clock: top_dp2|tx_phy_top_i|gxb_tx_i|tx_clkout2|ch0

component instantiation.

refclk1 is 100MHz

xcvr_refclk is 135Mhz

Timing

9 Replies

  • Nurina's avatar
    Nurina
    Icon for Regular Contributor rankRegular Contributor
    2 years ago

    Hi,


    Thank you for using Intel Communities. Can you share your design?


    Regards,

    Nurina


  • Nurina's avatar
    Nurina
    Icon for Regular Contributor rankRegular Contributor
    2 years ago

    Thank you. You are using Quartus 22.2?


    Regards,

    Nurina


    • paul26's avatar
      paul26
      Icon for New Contributor rankNew Contributor
      2 years ago

      Yes , I am using Quartus 22.2

      Regards,

      Paul

  • Nurina's avatar
    Nurina
    Icon for Regular Contributor rankRegular Contributor
    2 years ago

    Thank you. I think I found the issue, but first can you share the original example design for only one display port?


    Thanks,

    Nurina


  • Nurina's avatar
    Nurina
    Icon for Regular Contributor rankRegular Contributor
    2 years ago

    Hi,


    At first I thought there was something wrong with the SDC constraints. But looking into the original example design I suspect there's a misconnection somewhere in your design so I'm reassigning your case to XCVR expert.


    Regards,

    Nurina


  • ZH_Intel's avatar
    ZH_Intel
    Icon for Frequent Contributor rankFrequent Contributor
    2 years ago

    Hi Paul,

    Apologize for the delayed response as there is some technical difficulty.

    I have reviewed the design you shared here.

    After further discussion, I found that there are a lot of clocks unconstrained and require to add sdc for these clocks.

    Quartus Screenshot

    Our internal team has modified the dp.sdc file and the timing result looks ok.

    You may copy the dp.sdc file attached here and replace in your "\\designfile\fpga_top_intg_22_2_0_94(1)_restored\golden\golden_reset_sync_folder_structured\mySDC" directory, then re-compile the design.

    Hope this answers your question.

    Thank you.

    Best Regards,

    ZulsyafiqH_Intel

  • ZH_Intel's avatar
    ZH_Intel
    Icon for Frequent Contributor rankFrequent Contributor
    2 years ago

    Hi Paul,

    Good day.

    We do not receive any response from you to the previous answer that I have provided.

    With that said, this thread will be transitioned to community support. If you have a new question, feel free to open a new thread to get the support from Intel experts. Otherwise, the community users will continue to help you on this thread.

    Thank you.

    Best Regards,

    ZulsyafiqH_Intel