Test Add-half

module add-half(sum,c_out,a,b);
input a,b;
output sum,c_out;
wire c_out_bar; // 內部接線
xor(sum,a,b);
nand(c_out_bar,a,b);
not(c_out,c_out_bar);
endmodule
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Behavioral model 行為模式
always

begin

sum = a + b;
c = a & b;

end