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anrfpga's avatar
anrfpga
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4 years ago
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Understanding SW3 settings in Agilex Devkit

Hi All, I am trying to understand the JTAG chain settings of the Agilex Devkit I have. The SW3 settings in Table 9 of its user guide is a little confusing to understand. The default setting (Mode ...
  • tehjingy_Altera's avatar
    tehjingy_Altera
    4 years ago

    Hi anrfpga


    Sorry for the multiple confusion through the thread.


    "Chained HPS with SDM nodes internally" refers to the HPS is chained to the SDM through the FPGA silicone and the HPS is connected to the JTAG chain through the SDM Jtag Pins.


    "Chained HPS with SDM nodes externally" refers to the HPS not connected to the SDM. The HPS will be connected externally through the OOBE daughter card through its own dedicated JTAG pins.


    For mode 001 to enable the HPS on the Jtag chain, it requires an additional OOBE daugther card for the HPS to be able to appear on the JTAG chain.


    Regards

    Jingyang, Teh


anrfpga's avatar
anrfpga
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4 years ago

Hi Jingyang,

Thanks for your reply. That makes sense. Can you point me to A.2.1 and A.2.2? I could not find these sections in the document I am referring to.

When I change switch to Mode 001, I am getting "Unable to scan device chain. Can't scan JTAG chain" error instead of seeing the HPS in the JTAG chain. My SW1 settings are set to JTAG configuration mode and SW3 settings are set to (OFF/ON/ON/ON/ON/OFF/ON/ON = SW3.1 and SW3.6 are set to OFF). How could be the issue here?

Running the JTAG chain integrity test in the JTAG chain debugger is throwing

Error: JTAG chain problem detected.

Error: No device detected. Detected 1's at TDI pin.