![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
关于以下程序,当输入为A = 0011,B = 1101时下列说法中正确的是: 顶层模块:module add_full4(A,B,C,S); input [3:0] A,B;output [3:0] S; output [4:0] C; assign C[0]=0;add_full u1(A[0],B[0],C[0],C[1],S[0]), u2(A[1],B[1],C[1],C[2],S[1]),u3(A[2],B[2],C[2],C[3],S[2]),u4(A[3],B[3],C[3],C[4],S[3]);endmodule底层模块:module Learn3_1 (A, B, C, Carry, S); input A, B, C;output Carry, S;assign S = A^B^C;assign Carry = (A&B)|(B&C)|(A&C);endmodule