conf_done LED blinks once - conf_done LED blinks once Hi, I'm a FPGA newbie with a DE10-nano board and have a problem with it. I use the USB blaster. When I supply power on my board, 3.3V Power LED, conf_done LED go HIGH, and USER LED blinks. At first, LED 0:7 also blink sequentially. It's a simple test code and I think my code doesn't have any problem. The four input pins are assigned to SW 0:3, and the eight output pins are assigned to LED 0:7. So if I turn up each switch, two leds go HIGH. Like this. It works well, but after several seconds (around 18s ~ 20s) conf_done LED (LED10) goes LOW and quickly goes HIGH. (This takes less than 1 second.) So the loaded data is gone. Everything got reset. So led 0:7 blink sequentially again. I did nothing. The power goes to the board constantly. What is the problem? What should I do? Waiting your help. Thank you. Replies: Re: conf_done LED blinks once Wow! Now it works thx !!! Replies: Re: conf_done LED blinks once What Quartus are you using to compile the code? What kind of .sof file did it generate, like xxx_time_limited.sof? Replies: Re: conf_done LED blinks once Yes, so I'm saying remove the SD card so the HPS won't boot. Replies: Re: conf_done LED blinks once (I didn't intend to click the accept button! My problem isn't solved.) Yes I already have inserted the SD card in my board. ;( Sometimes the loaded data is gone and sometimes it remains. What is the problem.. ~~ Replies: Re: conf_done LED blinks once Do you have an SD card installed? If so, the HPS is probably booting and then reconfiguring the FPGA back to its default design.