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SYiwe's avatar
SYiwe
Icon for Occasional Contributor rankOccasional Contributor
7 years ago

Cannot access the JTAG port of Arria10 SoC

There’re two Arria 10 SoCs in my design, the follwoing picture indicates the JTAG chain on board. Chip A and Chip B share the same TCK & TMS. TCK is pulled down to GND and TMS is pulled up to VCCP...
RPDM's avatar
RPDM
Icon for Occasional Contributor rankOccasional Contributor
7 years ago

Make sure nCONFIG isn't pulled low - as I think that prevents a valid JTAG ID from being returned (at least, that's what I've experienced in the past).

  • SYiwe's avatar
    SYiwe
    Icon for Occasional Contributor rankOccasional Contributor
    7 years ago

    Thank you very much for your answer. That might explain the UNKNOW_DEVICE problem, but I'm still wondering why programmer report TDI might be shorted to GND.