52. The block diagram in FIGURE 10.66 is a four-input, two-output combinational switching circuit. If s1 s0 = 00, the a input is broadcast to x and y. If s1 s0 = 01, the b input is broadcast to x and y. If s1 s0 = 10, a and b pass straight through to x and y. If s1 s0 = 11, they are switched, with a being routed to y and b to x. Construct the circuit using only AND, OR, and inverter gates.

(a) Use Karnaugh maps to construct the minimum AND-OR circuit. (b)

Use Karnaugh maps to construct the minimum OR-AND circuit.

b FIGURE 10.66 The block diagram for Exercise 52. x 00-OS IS 1) IS y b a 15 3- 10-OS IS x a y b sl so = 10 3- y x a b sl s0-11 IS y x