Task A: Draw the circuit for a 4-bit seven-segment-display decoder:

Step 1: Create a truth table for a four input (w,x,y,z) and seven-output (a,b,c,d,e,f,g) seven-segment display decoder. The outputs that are enabled for each input combination form the input number on the display. For example, the wxyz input combination of 0000 will enable outputs a,b,c,d,e,f but not g. This will form a zero on the seven segment display. The wxyz input of 10 through 15 should cause the display to show an E (stands for Error).

Step 2: Derive the minimized Boolean expressions for outputs a through g using K-Maps

Step 3: Draw the logic circuit for the seven-segment-display decoder using the minimized Boolean expressions

Task B: Enable input

Modify the design of your decoder by adding an enable bit (call it input k). If k is 1, the decoder should function normally. If k is zero, the seven segment should display zero regardless of the values on wxyz.