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Altera_Forum's avatar
Altera_Forum
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15 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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    15 years ago

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

    Because the 2 FPGA are the same!
  • Altera_Forum's avatar
    Altera_Forum
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    15 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
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    15 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
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    15 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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    15 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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    15 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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    15 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.