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Fresh_Leon's avatar
Fresh_Leon
Icon for New Contributor rankNew Contributor
5 years ago
Solved

Reference clock for PLL

Dear, In Arria 10 Datasheet, the max frequency of three PLL (CMU, ATX, fPLL) is 800MHz (Page 28). However, in a10gx_si_e4 schematic, I found that Y6 oscillator (Si570) was programed to 875MHz. ...
  • EngWei_O_Intel's avatar
    EngWei_O_Intel
    5 years ago

    Hi Yang Ni

    The feedback I got is that we have to follow the latest datasheet, handbook, and pin connection guideline for new board designs.

    For the existing board we are using, it depends on how the Quartus/IP rule checks, if the reference designs are based on an older Quartus tools which allowed 875MHz, then we can use as it is. If we upgrading the reference design and encounter the error, we have to change both RTL design and program the oscillator as well.

    Thanks.

    Eng Wei

Fresh_Leon's avatar
Fresh_Leon
Icon for New Contributor rankNew Contributor
5 years ago

It's OK.

Take your time.

Brs,

Leon

EngWei_O_Intel's avatar
EngWei_O_Intel
Icon for Frequent Contributor rankFrequent Contributor
5 years ago

Hi Yang Ni

The feedback I got is that we have to follow the latest datasheet, handbook, and pin connection guideline for new board designs.

For the existing board we are using, it depends on how the Quartus/IP rule checks, if the reference designs are based on an older Quartus tools which allowed 875MHz, then we can use as it is. If we upgrading the reference design and encounter the error, we have to change both RTL design and program the oscillator as well.

Thanks.

Eng Wei

  • Fresh_Leon's avatar
    Fresh_Leon
    Icon for New Contributor rankNew Contributor
    5 years ago

    Hi, Wei

    Understood.

    Thanks.

    Brs,

    Leon

    • EngWei_O_Intel's avatar
      EngWei_O_Intel
      Icon for Frequent Contributor rankFrequent Contributor
      5 years ago

      Cool Leon. I will transition this case 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 for contacting us.

      Eng Wei

      • EngWei_O_Intel's avatar
        EngWei_O_Intel
        Icon for Frequent Contributor rankFrequent Contributor
        5 years ago

        Hi Leon

        You can set this case to closure too if there is no further request needed on this case.

        Thanks.

        Eng Wei

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