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anrfpga's avatar
anrfpga
Icon for New Contributor rankNew Contributor
3 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
    3 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


tehjingy_Altera's avatar
tehjingy_Altera
Icon for Regular Contributor rankRegular Contributor
3 years ago

Hi anrfpga


There are 2 modes for each SW3 settings is because there are 2 options to connect the JTAG connection.

One way is through an external Intel FPGA Download Cable II dongle connected to the JTAG Header connecter or through an internal Intel FPGA Download Cable II dongle connected through using a usb cable.

Refer to Section A.2.1 and A.2.2.


To be in Mode 1 refers to when you connect using the internal Intel FPGA Download Cable II dongle and Mode 3 refers to when you connect using an external Intel FPGA Download Cable II dongle.


"Chained HPS with SDM nodes externally" in Mode 001 means that it will connected together through the external Intel FPGA Download Cable II dongle. You could see it in the JTAG chain.


Regards

Jingyang, Teh