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kcheung's avatar
kcheung
Icon for New Contributor rankNew Contributor
3 years ago

fused fpga and jtag

i would like to know if there is a way max10 fpga can be fused. I have a board that can no longer be detected with usb blaster ii. Someone was messing with the board and images. Now, I can ...
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kcheung's avatar
kcheung
Icon for New Contributor rankNew Contributor
3 years ago

There is no change on the pin JTAG_EN. I want to know if there is someway to stop FPGA JTAG access without a board level change.

Is there a way that someone had programmed an image that may stop FPGA from accessible through JTAG ?

I have the FPGA replaced and now the board is working. the USB blaster can program the FPGA again.

I want to know any mechanism that could kill the JTAG interface on the Max10.

Thanks

  • FvM's avatar
    FvM
    Icon for Super Contributor rankSuper Contributor
    3 years ago
    Hi,
    if JTAGEN isn't pulled high on the board and someone enabled JTAG pin sharing inadvertently, you loose JTAG access.
    • kcheung's avatar
      kcheung
      Icon for New Contributor rankNew Contributor
      3 years ago

      Thanks for the reply. I have the question.

      1. I am sure that the JTAGEN is pulled high,

      2. when you mentioned "lose JTAG access", do you mean momentarily ? or you mean permanently ?

      The symptom I have encountered is that there is no hardware modification and yet, I lost the JTAG access. After replacing the FPGA, the USB blaster works and I can program the FPGA again.