ASAP

1) A digital computer has a common bus system for 16 registers of 32 bits each. The bus is constructed with multiplexers. [4.6 Mano] [ 10 points] a. How many selection inputs are there in each multiplexer? b. What size of multiplexers are needed? c. How many multiplexers are there in the bus? 2) The adder-subtractor circuit of Fig. 4.7 has the following values for input mode M. and data inputs A and B. In each case, determine the values of the outputs: S3,S2,S1, So, and C4 [4.12 Mano] [10 points] 3) Design an arithmetic circuit with one selection variable S and two n-bit data inputs A and B. The circuit generates the following four arithmetic operations in conjunction with the input carry Cin. Draw the logic diagram for the first two stages. [4.15 Mano] [30 points]