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1. Half-adder

Module half_adder (S, C, x, y); Output S, C; input x, y; XOR (S, x, y); and (C, x, y ); endmodule

2. Full-adder

Module full_adder (S, C, x, y, z); Output S, C; input x, y, z; wire S1, D1, D2; half_adder HA1 (S1, D1, x, Y); half_adder ha2 (S, D2, S1, Z); or G1 (C, D2, D1); endmodule 3. 4bit ripple carry AdderModule ripple_carry_4_bit_adder (output [3: 0] S, output C4, input [3: 0] A, B, input C0); wire C1, C2, C3; full_adder fa0 (s [0], c1, a [0], B [0], C0), fa1 (s [1], C2, a [1], B [1], C1 ), fa2 (s [2], C3, a [2], B [2], C2), fa3 (s [3], C4, a [3], B [3], C3); endmodule 4. 16bit ripple carry AdderModule fulla16 (sum, c_out, A, B, c_in); Output [] sum; Output c_out; input [] A; input [] B; input c_in; wire C0, C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14; full_adder fa0 (sum [0], c0, a [0], B [0], c_in); full_adder fa1 (sum [1], C1, a [1], B [1], C0 ); full_adder fa2 (sum [2], C2, a [2], B [2], C1); full_adder fa3 (sum [3], C3, a [3], B [3], C2); full_adder fa4 (sum [4], C4, a [4], B [4], C3); full_adder fa5 (sum [5], c5, a [5], B [5], C4); full_adder fa6 (sum [6], C6, a [6], B [6], C5 ); full_adder fa7 (sum [7], C7, a [7], B [7], C6); full_adder fa8 (sum [8], C8, a [8], B [8], C7); full_adder fa9 (sum [9], C9, a [9], B [9], C8); full_adder fa10 (sum [10], c10, a [10], B [10], C9); full_adder fa11 (sum [11], C11, a [11], B [11], C10 ); full_adder fa12 (sum [12], C12, a [12], B [12], C11); full_adder fa13 (sum [13], C12, a [13], B [13], C12); full_adder fa14 (sum [14], C12, a [14], B [14], C13); full_adder fa15 (sum [15], c12, a [15], B [15], C14); endmodule 16bit adder simulation results 4bit adder simulation results Answers:?? ?? ??? ???.???? ??? ?? ?? ?? Test environment? ??? ??.??? ??? 4bit ripple carry adder ??? ?? ????? ????????? ??? ???. ???? ?? ??? ??? ????? ? ? ??? ?? ????.

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