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HAlex's avatar
HAlex
Icon for Occasional Contributor rankOccasional Contributor
3 years ago
Solved

Warning (169180): Following 4 pins must use external clamping diodes.

Hello I am using EP4CGX150CF23C8 connected to EPCQ128ASI16N flash at ASx1 mode. Serial flash should store 2 images (factory and application) and should work at remote update mode. When I setup...
  • hareesh's avatar
    hareesh
    3 years ago

    Hi Alex Halfin,

    if you see in fig. 8 - 28 it has two headers. one for JTAG mode header and another one AS mode header. if you following combine the AS configuration scheme with the JTAG-based configuration then follow fig. 8-28 schematic or following programming of a serial configuration device with the JTAG interface then AS mode header and those diodes are not required.

    Cyclone IV Device Handbook pdf link attaching here

    https://www.ee.ryerson.ca/~courses/ee8205/Data-Sheets/sopc/cyclone4-handbook.pdf

    Thank you

    Hareesh.

HAlex's avatar
HAlex
Icon for Occasional Contributor rankOccasional Contributor
3 years ago

Hello

In my board the connection made exactly by Handbook recommendation (figure 8-29):

There are no diodes mentioned in Cyclone IV Handbook.

I raised the diode's question only after getting a Quartus warning (and this is after the board's layout is finished and the board is at production now).

Diode's are shown in Handbook only in connection with additional header like on figure 8-28.

My question: is the Quartus warning related only to connections described like on figure 8-28 and it is not relevant to my case?

Thank you

Alex

  • hareesh's avatar
    hareesh
    Icon for Frequent Contributor rankFrequent Contributor
    3 years ago

    Hi Alex Halfin,

    if you see in fig. 8 - 28 it has two headers. one for JTAG mode header and another one AS mode header. if you following combine the AS configuration scheme with the JTAG-based configuration then follow fig. 8-28 schematic or following programming of a serial configuration device with the JTAG interface then AS mode header and those diodes are not required.

    Cyclone IV Device Handbook pdf link attaching here

    https://www.ee.ryerson.ca/~courses/ee8205/Data-Sheets/sopc/cyclone4-handbook.pdf

    Thank you

    Hareesh.

    • hareesh's avatar
      hareesh
      Icon for Frequent Contributor rankFrequent Contributor
      3 years ago

      hi @HAlex,

      I think you got solution to issue. so, shell I close the case.

      thanks,

      • HAlex's avatar
        HAlex
        Icon for Occasional Contributor rankOccasional Contributor
        3 years ago

        Hello

        You can close this case but I think you should fix the description of this warning (169180) at Quartus software as a must warning.

        As actually it is not must for all configurations and must only for non-SFL connection of serial flash to the FPGA as described in figure 8-28, and not must for configuration as I did according the figure 8-29.

        Thank you

        Alex