Description: Clk 50MHz clock signal input rst the reset control buttons (active low) en (0-2) by three keys to control the three states (active low).
When en () = `0` when to start the addition count and the results to two digital tube dynamic display, two digital tube flashing segment in the opposite direction in order
When en (1) = `0` when you start subtraction counting and results to two digital tube dynamic display, two digital tube segment flashing sequence in the opposite direction, the the flashing direction with the addition opposite
When en (2) = `0` when start the LED flashes, LED lights flashing sequentially, water
4 When the when rst = `0`, reset cleared
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