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Altera_Forum's avatar
Altera_Forum
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16 years ago

Reset the FPGA via JTAG

Hello,

Is there any tool to reset the Cyclone FPGA via JTAG (USB-Blaster) and force it to re-read the configuration from the EPCS?

Problem is: I use quartus_pgm to download a simple NIOS in the Cyclone (quartus_pgm -c USB-Blaster -m JTAG -o P;file@1). Then, I load a flash file with an FPGA configuration and NIOS application (nios2-flash-programmer --device 1 -e --base=0x802800 --program file).

If I simply use the option --go in nios2-flash-programmer, only the processor is reset; my new FPGA configuration is not loaded until I power the board off then on.

So, is there something like "quartus_pgm -c USB-Blaster -o R;@1"??? (The @1 is important as I want to individually reset the FPGAs in a JTAG chain)

Thanks in advance.

Fernando

4 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    Yes, thanks. But it does not load from the configuration device; it just initializes the FPGA with the currently loaded configuration.

    :mad:
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    --- Quote Start ---

    But it does not load from the configuration device; it just initializes the FPGA with the currently loaded configuration.

    --- Quote End ---

    I think, a reconfiguration request results in reloading the configuration from the hardware defined configuration source. I don't understand, how the programmer inititializes the FPGA without reloading the configuration. I thought, that it's the equivalent to the option "Initiate configuration after programming" in interactive programming.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    I don't know how it works, but I have one configuration in external flash and a different one is downloaded to the FPGA via quartus_pgm ...-i. After the download is finished, the FPGA executes the downloaded one.

    I decided to go the "hard way":

    -quartus_pgm simple_config.sof

    -nios2-flash-programmer complete_config+nios_application.flash

    -quartus_pgm complete_config.sof

    This way it restarts with the correct configuration.

    (I need this 'restart-without-power-cycle' for production programming and testing without operator intervention).

    Thanks anyway.

    BR

    Fernando