Precautions for FPGA download and configuration Circuit

 

 The FPGA Configuration circuit is the same on Cyclone II and cyclone III, but the vcca is different, as shown in: Vcca must connect 2.5 V to cyclone III, and 3.3 V to Cyclone II and cyclone. note this. If you do not pay attention to this, use the download circuit of cycloneii to develop the cycloneiii download circuit, the waiting result cannot be downloaded.ProgramThis example tells us that there may be different series of the same device. Therefore, you must read the data manual carefully when designing the circuit. At the same time, vcca also affects the selection of high level in the selection of msel device download mode. The high level of msel must be the same as that of vcca.