Honored ContributorWhen i try to program the FPGA cyclone III i get this error :
error: can't access jtag chain
error: operation failed. I am using a FPGA cyclone III .I would be able to program it a few months ago with no problem but now it suddenly gives me that error.Can anyone help?? ps. I am using the usb blaster. please can somebody help me?
Honored ContributorTurns out my main problem is that the FPGA isn't soldered to the board. Truely an epic fail. Will come back here and report after we get another board fabed.
Honored Contributorwswuda2007: I can't see any image you post.
Did you try and check the signals with a scope? hines1957: what package is it? was it glued on the board?Honored ContributorHonored ContributorCheck the JTAG signals. Especially the clock, that must have clean edges.
Honored ContributorHonored ContributorIt should be a clock signal. Are you looking while you are doing a configuration?
Honored ContributorTCK is driven by USB-Blaster but only while something is using it. A quartus_pgm will drive it continually but something like the Nios debugger or terminal will drive it in bursts if it is just polling for activity
New ContributorI can relate to your issue. I attempted to resolve it and it appears to be functioning properly now.
Below is my solution:
1. Follow the steps in the link. It works initially, but the problem resurfaces after a day.
2. It appears that the error message "Error: Can't access JTAG chain" was caused by a permission issue. In order to resolve the problem, I reinstalled Quartus (version 22) as the root user, and this successfully solved the issue.
3. It's a good idea for a regular user to launch the program, as it avoids the need to constantly switch users. To grant others the same permissions as the root user, I utilized the command `ruibin@E590:/media/ruibin/Data/01/2531/quartus/quartus/bin$ sudo chmod u+s *`.
4.If you come across this issue: Quartus displays an error message stating "error while loading shared libraries: libprotobuf.so.14: cannot open shared object file: No such file or directory." see: https://www.intel.com/content/www/us/en/support/programmable/articles/000093063.html
I understand that launching the software as a root user may not be the best approach, but it seems like the most direct solution to my problem. If you have any other suggestions, please share them with me. Thank you!
Also, I hope my response can be helpful to anyone else who is facing a similar issue.
ContributorFor the USB Blaster 2 devices, if the USB cable is too long, this can happen especially if one uses a USB extension cable. Reducing the frequency to 6 MHz (the old Blaster's frequency) doesn't help either. But I never had this issue with the old Blaster, even with a USB extension.
