the display has ten light bulbs going up apole and we want one light per second to illuminate ( with previous one turning off ), starting from bulb 9 at the bottom of the pole, and ending with bulb 0 at the top. The controller sets E=1 when the countdown begins in the last ten seconds, and then counts down from 9 to 0 in binary.
1).To develop contoller as a sequential circuit using minimum number of D flip-flops and the minimum number of external gates. the controller should set the values of the control lines appropriately to drive the combinational logic circuit.
2).To design combinational logic circuit that controls the light bulbs using minimum number of 2*4 decoders and minimum number of external gates.Also to draw schematic diagram consisting of flip-flops, decoders and external circuitry.