Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

Error: Can't access JTAG chain Error: Operation failed

Dear all,

i have a custom board, with stratix II, and Cyclone II,

till today i dont have any problem in downloading code, and debug with JTAG port,

but today i got "Error: Can't access JTAG chain Error: Operation failed" , when i try to program,

programmer is working with other boards, and all fine,

only this 2 board, does anybody have solution, if i have to correct the board. and work for

jtag

regards

baba

14 Replies

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

    Hi babaship

    Did you find a solution to this problem - I have the same problem. Boards that have worked for ages suddenly stop talking to the USB-Blaster. The boards seem to work otherwise but won't communicate via JTAG.

    Cheers

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

    hi, that problem is due to board smt soldering is not done properly. so, it gone bad

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

    Same problem here, but My board is Altera Cyclone EP1C12Q240C8. Any help appreciated..

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

    --- Quote Start ---

    Same problem here, but My board is Altera Cyclone EP1C12Q240C8. Any help appreciated..

    --- Quote End ---

    i have the same problem with you.

    i have two board that can't access JTAG chain when i try to program it.

    what will be the problem??

    my ics are ep1c12q240c8 and ep2c5q208cn.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    I also have the problem, my chip is EP2C8Q208, I use byteblasterII to download the program, when I use the AS mode, it can work. but when I choose the JTAG mode, it doesn't work now, several days ago it can work. I checked the circuit around the JTAG, there are no problems with the soldering. Is there anybody solve this problem? Thank you.

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

    The power supply connection to your board might not be proper configured. The connection which comes the voltage regulator (+5v G -5V) has to be connected in a proper manner. Check them out again.

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

    --- Quote Start ---

    The power supply connection to your board might not be proper configured. The connection which comes the voltage regulator (+5v G -5V) has to be connected in a proper manner. Check them out again.

    --- Quote End ---

    I checked this, I found the net TCK to ground is about 80 ohm, whereas other nets are all about 10k. The problem is similar with below:

    http://www.alteraforum.com/forum/showthread.php?t=6340&highlight=jtag