Honored ContributorHi,
I am using a cyclone iii on a custom board I made and I am trying to make sure the fpga section of the board is functional. When I program the fpga, I get the "100% successful" message from Quartus. However, when I test the output pins, they are all stuck at high regardless of my inputs. I was wondering if this means the chip is fried even though the JTAG function is working? Best,
Honored ContributorIf there is no smoke or smell then I would exclude that. try signaltap on few nodes.
Honored ContributorWhat is the state of your nCE pin?
Honored ContributorI just checked and the nCE is tied to the ground on the board.
Honored ContributorIt might be worth checking the state of the nStatus and Config_Done pins after programming. Even though Quartus thinks everything is OK, something may still be amiss.
Honored ContributorRight now, I am trying to use signal tap as kaz mentioned but I get an "Invalid JTAG configuration" message in the Instance Manager. I must add that I do not get any problems messages when I "scan JTAG chain". Is there some problem that the JTAG scanner is not picking up on?
Honored ContributorThanks gj_leeson.
You were right, it was the "Config_done" pin. It was pulled up to 1.2V with a 1Kohm. I changed it to a 10K to 2.5V and now it's working. You guys were great help.Honored ContributorThanks for good information
