What are the bit-values (0 or 1) of each line of output H in Fig. 4-12. (Pay due attention to the indices and directions. )

(a) If input A is 0110,  S = 1,  and  I_R = 1,  I_L= 1 

H₃=?   H₂= ?  H₁= ?  H₀= ?

(b) If input A is 0110,  S = 0,  and I_R = 1,  I_L= 1

H₃=?   H₂= ?  H₁= ?  H₀= ?

 

Ao A1 A2 A3 Serial input (IR) Serial input (/L) Select O for shift right (down) 1 for shift left (up) S 0 S S 0 S 0 MUX MUX MUX MUX Ho F H Hy Select S Function table Output Ho H H 0 IR 1 A Figure 4-12 4-bit combinational circuit shifter. H3 Ao A A A3 IL A2