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Altera_Forum's avatar
Altera_Forum
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9 years ago

Max 10 IO status when Jtag Programming

Hi there,

I use Max 10 10M04DAU324 Series FPGA in our design.

Only I konw that IO status keeps tri-state with internal weak pull-high when CFM to SRAM(config mode) as attachment picture showed "2".

I wonder the IO status keeps tri-state OR remain high when JTAG programming status as attachment picture showed "1".

Is there have any official doc can prove IO status at JTAG programming on Max 10, thanks.

4 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    9 years ago

    --- Quote Start ---

    In a normal ISP operation, to update the internal flash with a new design image, the device exits from user mode and all I/O pins remain tri-stated.

    --- Quote End ---

    Whenever the device is not in user mode all I/O are tri-stated. This includes when the device is being configure via JTAG.

    See the 'max 10 fpga configuration user guide (https://www.altera.com/content/dam/altera-www/global/en_us/pdfs/literature/hb/max-10/ug_m10_config.pdf)'.

    Cheers,

    Alex
  • Altera_Forum's avatar
    Altera_Forum
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    9 years ago

    Hi Alex,

    'MAX 10 FPGA Configuration User Guide' doen't specified IO status when jtag programming, I do some experiment at MAX® 10 FPGA Evaluation Kit with checking set IO remaing weak-pull high piror User Mode(default is pull high), and have strange things happend, I wonder that is Quartus 16.1 tool's bug.

    Thanks.
  • Altera_Forum's avatar
    Altera_Forum
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    9 years ago

    Hi Alex,

    No, But I know that ISP Clamp is workable. Discussed with Altera AE, they still test on this problem.

    Thanks.