题解 | #4bit超前进位加法器电路#
4bit超前进位加法器电路
https://www.nowcoder.com/practice/4d5b6dc4bb2848039da2ee40f9738363
`timescale 1ns/1ns
module lca_4(
input [3:0] A_in ,
input [3:0] B_in ,
input C_1 ,
output wire CO ,
output wire [3:0] S
);
wire [3:0] p;
wire [3:0] g;
wire [3:0] c;
genvar i;
generate
for (i=0;i<4;i=i+1) begin:pg_4
pg_gen pg(
.a(A_in[i]),
.b(B_in[i]),
.p(p[i]),
.g(g[i])
);
end
endgenerate
assign c[0] = g[0] | p[0]&C_1;
assign c[1] = g[1] | p[1]&c[0];
assign c[2] = g[2] | p[2]&c[1];
assign c[3] = g[3] | p[3]&c[2];
assign S[0] = p[0]^C_1;
assign S[1] = p[1]^c[0];
assign S[2] = p[2]^c[1];
assign S[3] = p[3]^c[2];
assign CO = c[3];
endmodule
module pg_gen(
input a,
input b,
output p,
output g
);
assign g =a&b;
assign p =a^b;
endmodule
#verilog刷题记录#