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Altera_Forum's avatar
Altera_Forum
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16 years ago

What kind of pad does the Quartus select when I configure the i/o as single-ended .

what kind of pad does the quartus select when i configure the i/o pins as single-ended vs differential pair? (are these pads differrent?)

I'm using the pads of HSMC in Stratix III kit as single-ended I/O pins. But it does not work. Do i need to setting anything to Quartus software to make it knows that i want to used the pads as singled-ended IO pads?

Similar if i want to used the pad of HSMC as differential pair, do i need to setting anything to Quartus?

Thank for your helping in advance!

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    16 years ago

    To configure a pin as single-ended, you simply set the I/O standard for that pin to one of the supported single-ended I/O standard. This can be done using the Assignment Editor or the Pin Planner. If you want to use a differential standard, you do the same thing only choose a supported differential I/O standard and make the assignment only to the positive pin in the pair. The negative pin will automatically take on the required assignment. In your design, don't include the negative pin and just treat the positive pin as if it were single-ended.

    Jake
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    Your guide confirms my settings are correct (as you show). So my problem maybe due to my pcb board designing.

    Thanks jakojones!