conf_done LED blinks once

[jelly]

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.

[sstrell · Accepted solution]

Do you have an SD card installed?  If so, the HPS is probably booting and then reconfiguring the FPGA back to its default design.

[jelly]

(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.. ~~

[sstrell]

Yes, so I'm saying remove the SD card so the HPS won't boot.

[jelly]

Wow!

Now it works thx !!!

[BXia]

What Quartus are you using to compile the code? What kind of .sof file did it generate, like xxx_time_limited.sof?