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

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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.

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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