Forum Discussion

nelky's avatar
nelky
Icon for Occasional Contributor rankOccasional Contributor
1 year ago

avalon_master_waitrequest signal is always high

Hi,

I am creating a project using Quartus Prime Pro on AGFB022R25A2I3V to read and write to single-port on-chip RAM.

When I tried to simulate using modelsim, I found that the avalon_master_waitrequest signal is always high.

avalon_master_waitrequest is an input pin which takes signal from altera_mm_interconnect_1920_haeydly uav_waitrequest pin.

But I don't know who is controlling this pin. It always stays high.

Can you please explain to me why it is so? I may have done some settings wrongly and it causes this pin to always stays high.

Please guide me.

Regards

Pcie

6 Replies

  • ShengN_altera's avatar
    ShengN_altera
    Icon for Super Contributor rankSuper Contributor
    1 year ago

    Hi,


    May I know is that the avalon_master_waitrequest signal is the signal of the pcie ip avalon_mm? Which pcie ip you're using?


    Thanks,

    Regards,

    Sheng


    • nelky's avatar
      nelky
      Icon for Occasional Contributor rankOccasional Contributor
      1 year ago

      Hi Sheng,

      I don't use any pcie ip. I am using on-chip memoery II (RAM or ROM) Intel FPGA IP.

      Regards

  • ShengN_altera's avatar
    ShengN_altera
    Icon for Super Contributor rankSuper Contributor
    1 year ago

    Hi,


    May I know in your design which ip (avalon-mm master) is interfaced with this on-chip memoery II (RAM or ROM) Intel FPGA IP? I think avalon_master_waitrequest is a signal of the avalon-mm master.

    Are you using BFM simulation?

    Possible to provide the on-chip memoery II .ip file for checking the settings?


    Thanks,

    Regards,

    Sheng


    • nelky's avatar
      nelky
      Icon for Occasional Contributor rankOccasional Contributor
      1 year ago

      Hi ShengN,

      I created the master myself. After checking, I found that the avalon_master_waitrequest at the master side is an input pin. It gets the signal from altera_mm_interconnect_1920_haeydly uav_waitrequest pin. But this pin somehow stays high forever. Do I miss out anything here?

      Regards

  • sstrell's avatar
    sstrell
    Icon for Super Contributor rankSuper Contributor
    1 year ago

    Is the host only connected to the RAM? Is it connected to any other components?

    waitrequest is held high automatically by the interconnect if an agent is not ready yet to respond to a command or if the agent manually controls the waitrequest signal.

  • nelky's avatar
    nelky
    Icon for Occasional Contributor rankOccasional Contributor
    1 year ago

    Hi all,

    After checking, it's because the reset pin not set properly. It stays at reset condition all the time. That's why the waitrequest doesn't toggle.

    Now it is ok already.

    Thanks all.

    Regards