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HZhen21's avatar
HZhen21
Icon for New Contributor rankNew Contributor
6 years ago
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Broken Pins Determination?

Hi, I am using Cyclone 10LP for SPI communication between PIC24 and this FPGA. I accidentally assigned same trace ports, SPI MOSI from PIC24 to Cyclone 10LP, both as output ports on both side. After I fixed the FPGA port direction, I measured 1.3V at the PIC24 output instead of 3.3V. After I took out 33 ohms series resistor, I can see 3.3V at the PIC24 output, so I assumed the FPGA pin is broken.

I want to know how can I determine and make sure this pin is damaged and not working functional?

Thank you!

  • YuanLi_S_Intel's avatar
    YuanLi_S_Intel
    6 years ago

    Hi Hao Zhen,

    1 of the most easiest way is to toggle the output pin and then measure the pin using ossilloscope. If the VIH and VOH is as expected, then it is not broken.

    Thank You.

4 Replies

  • YuanLi_S_Intel's avatar
    YuanLi_S_Intel
    Icon for Regular Contributor rankRegular Contributor
    6 years ago

    Hi Hao Zhen,

    1 of the most easiest way is to toggle the output pin and then measure the pin using ossilloscope. If the VIH and VOH is as expected, then it is not broken.

    Thank You.

    • HZhen21's avatar
      HZhen21
      Icon for New Contributor rankNew Contributor
      6 years ago

      Hello Bruce,

      Thanks for answering my question!

      Do you mean changing this pin of FPGA from input to output and toggle it? I did this test today and this FPGA pin can generate ~3.3V output pulse, 3.5V to be accurate.

      Thank you!

  • YuanLi_S_Intel's avatar
    YuanLi_S_Intel
    Icon for Regular Contributor rankRegular Contributor
    6 years ago

    Yes sir. If it can be. By right it shouldnt have any problem on the pin.