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Altera_Forum's avatar
Altera_Forum
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16 years ago

how to download fpga in a JTAG chain using the USB bytebluaster

In my hardware, there is a jtag chain including 3 IC, MPC3813, and 2 EP3C16F256.

The USB byteblaster can detect the Jtag chain, but i can not download fpga code to one of EP3C16F256, it shows the message" Error: Device chain in Chain Description File does not match physical device chain -- expected 1 device(s) but found 3 device(s)."

Could anybody tell me how to solve this issue?

Thanks very much!

9 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    16 years ago

    --- Quote Start ---

    But how I can know which fpga in the board is the first one

    --- Quote End ---

    The enumeration should follow the physical JTAG chain order.
  • Altera_Forum's avatar
    Altera_Forum
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    16 years ago

    --- Quote Start ---

    The first one in the 'auto detected' list is the first one in the electrical chain as well.

    --- Quote End ---

    HI!

    josyb

    I also interested in this issue. you said " The first one in the 'auto detected' list is the first one in the electrical chain as well." But how I can know which fpga in the board is the first one that you mentioned. At this point I am not very clear.
  • Altera_Forum's avatar
    Altera_Forum
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    16 years ago

    The first one in the 'auto detected' list is the first one in the electrical chain as well.

  • Altera_Forum's avatar
    Altera_Forum
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    16 years ago

    --- Quote Start ---

    First click "Auto Detect" in the programmer's window, then add the wanted files to the device found. Selct which devices you want to program, then click 'Start'.

    --- Quote End ---

    Hi, Josyb

    Thanks for your reply. I have a question : how to identify the two same FPGA chipset? for example, i want to download code A to FPGA 1, and code B to FPGA 2. But from the jtag chain, i can not make sure which one is FPGA 1 and FPGA2 ?
  • Altera_Forum's avatar
    Altera_Forum
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    16 years ago

    first run an auto-detect on the chain. next, double click in the file column for the FPGA you would like to program and select your programming file, then click the program checkbox. i would expect the order of the devices after auto-detecting would be the order they appear on the JTAG chain

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

    First click "Auto Detect" in the programmer's window, then add the wanted files to the device found. Selct which devices you want to program, then click 'Start'.

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

    How to let the programer know which FPGA i want to download ?

    Because the 2 FPGA are the same!