② 请用全加器电路①实现串行进位的4位全加器电路 1位全加器参考代码如下： module add_half( input A , input B , output wire S , output wire C ); assign S = A ^ B; assign C = A & B; endmodule *************************************************************** module add_full( input A , input B , input Ci , output wire S , output wire Co ); wire c_1; wire c_2; wire sum_1; add_half add_half_1( .A (A), .B (B), .S (sum_1), .C (c_1) ); add_half add_half_2( .A (sum_1), .B (Ci), .S (S), .C (c_2) ); assign Co = c_1 c_2; endmodule

输入描述:

   input         [3:0]  A   ,   input         [3:0]  B   ,   input                Ci  , 

输出描述:

   output    wire [3:0]  S   ,   output   wire        Co