Question: A combinational circuit is used to control a seven-segment display of decimal digits, as shown in Figure 20.36. The circuit has four inputs, which provide

A combinational circuit is used to control a seven-segment display of decimal digits, as shown in Figure 20.36. The circuit has four inputs, which provide the four-bit code used in packed decimal representation (010 = 0000, ..... , 910 = 1001). The seven outputs define which segments will be activated to display a given decimal digit. Some combinations of inputs and outputs are not needed.

Figure 20.36 Seven-Segment LED Display Example
a. Develop a truth table for this circuit.
b. Express the truth table in SOP form.
c. Express the truth table in POS form.
d. Provide a simplified expression.

Z1 Z2 Combinational BCDX digitX3 circuit X4 Z5

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