Forum Discussion

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

JTAG pin sharing problem

I set JTAG pins as the user I/O ,when I first programed with usb blaster ,it was ok , after that ,when I programed again it failed . WHY? Here are the descriptions about the JTAG pin sharing...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

there is a bug on Quartus, so you need to affect TDO and use it as OUTPUT only;

from ALTERA/Support

"Why can’t I access the MAX 10 device via JTAG even though JTAGEN is pulled high in user mode?"

https://www.altera.com/support/support-resources/knowledge-base/solutions/rd03222016_95.html

"How do I gain access to the JTAG pins of my MAX 10 device if I have enabled the JTAG pin sharing option, and the Quartus Prime Programmer is unable to auto detect the device?"

https://www.altera.com/support/support-resources/knowledge-base/solutions/rd05192016_963.html