Using a 4-bit counter with parallel load as in Fig. 2-11 and a 4-bit adder as in Fig. 4-6, draw a block diagram that shows how to implement the following statements: 

x    :R1←R1 + R2     Add R2 to R1

x'y : R1←R1 + 1      Increment R1

where R1 is a counter with parallel load and R2 is a 4-bit register. 

Fig. 2-11

Fig. 4-6

S Serial input lo Serial input 13 Clock S S 6723 So S 0123 So 50Nm 2 So S 0123 4x1 MUX 4x1 MUX 4x1 MUX 4x1 MUX D PC D Q PC D >C D C As