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HI51's avatar
HI51
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5 months ago

Agilex5のHVIOバンクのピンの状態および最大周波数について

・Agilex5のHVIOバンクの電源起動後のピンの状態について教えてください 

電源起動後、コンフィギュレーション中のユーザーモードに入るまでのピンの状態を教えてください。「General-Purpose I/O User Guide: Agilex 5 FPGAs and SoCs」では「All pins are tri
stated.」と記述があり、プルアップ、プルダウン抵抗なしの状態かと思っておりましたが、

「Device Configuration User Guide: Agilex™ 5 FPGAs and SoCs」に記載のコンフィギュレーション中の「GPIO Status」に「Tri-Stated with Weak Pull-Up」と記載があり、どちらの情報が正しいのかと思い問い合わせしました。

接続先のデバイスの電源起動時の状態と合わせなくてはいけないため確認しています。

・HVIOバンクを使用する場合の信号の周波数に関して教えてください。

「Agilex™ 5 FPGAs:General Purpose I/Os」では

I/O maximum frequency or data transfer rate:
- 1.8 V: 125 MHz SDR or 250 Mbps DDR
- 2.5 V- 3.3 V: 100 MHz Fmax or 200 Mbps DDR

と記載があったのですが、「Agilex™ 5 FPGAs and SoCs Device Data Sheet」には記載を見つけられなく質問しました。

3 Replies

  • AqidAyman_Altera's avatar
    AqidAyman_Altera
    Icon for Regular Contributor rankRegular Contributor

    Hello,


    Regarding the pins' condition, both statements are correct. However, the Device Configuration User Guide is more precise:


    The pins are tri-stated (high impedance, Hi-Z) and, additionally, there is a weak pull-up resistor enabled during configuration. This means the pins will float high (toward VCCIO) but not drive any significant current.


    For the second question, the Data Sheet often focuses on absolute maximum ratings and DC/AC characteristics. Device Datasheet may not explicitly state the numbers, but the User Guide's values are considered authoritative for board-level design.


    Regards,

    Aqid



  • AqidAyman_Altera's avatar
    AqidAyman_Altera
    Icon for Regular Contributor rankRegular Contributor

    I hope the previous response was sufficient to help you proceed. 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/s/?language=en_US’, 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.


    • HI51's avatar
      HI51
      Icon for New Contributor rankNew Contributor

      Hello, thank you for your cooperation

      You mentioned that the pins on the HVIO bank are in a weak pull-up state during configuration. Does this mean that I need to pay attention to this state on the connected device? Or is it just a high resistance pull-up that doesn't require attention? I've seen cases where the startup setting for some controlling CPUs is a weak pull-down (tens of kilohms).