This used to work before I installed Quartus v10 to ensure backward-compatibility. Now I get no hardware found in Quartus both v13 and v10. The USB-Blaster used to show up, then I installed Quartus v10 to support old .ptr files and now the JTAG connection with the DE2 board is broken. Why? Is it because I installed Quartus v10? Then that is not logical. What is the explanation and what should be done?
Why no JTAG connection
fpgahardwareintel-fpgajtagquartus-ii
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Best Answer
Altera tools are finicky sometimes. I've had issues with them similar to what you describe. What I do when it gets to this point is do to device driver and uninstall whatever driver is there. If needed, display hidden devices. Then reattach the device and reinstall the drivers that come in the Quartus II 13 directory.
By the way, its best for you to stop using Quartus II 10 if possible. I say that because Altera only supports up to 3 versions back. Version 10 is already outdated and won't be supported by them. There are plenty of fixes in the new versions (and sometimes some new issues) and some versions are really bad about device support.