"Program Failed" for some demo projects.. in FPGA Posted February 10, 2015 Hello cfatu, Thank you for pointing this out! Finally I found that I wasn't using the correct power supply. I noticed that when some "big" project (which may consume more power) was downloaded to the FPGA, the input voltage fell below 5.0V and then the board could not work. Then I realized that the board had not enough power. The reference manual states that "The Atlys board requires an external 5V, 4A or greater power source with a coax center-positive 2.1mm internal-diameter plug (a suitable supply is provided as a part of the Atlys kit)". Everything is working now, after I found the right power supply. Thank you very much!