Then your first lines in the 7 segment decoder truth table will be Now, if you want to display a 0 you need to light up all segments except g. Imagine that the segments are noted with letters like To light up a segment the cathode must be grounded and the anode must be pulled to a logic HIGH voltage Each segment in the display is an LED having an anode and a cathode terminal. You have to create a corespondence table beween the binary code from your flip-flops and the 7 segments. This meas that you encode a decimal 0 with the 4 bits 0000. The 7-segment component inputs are binary encoded.
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