3位全加器vhdl代码
时间: 2024-06-13 07:06:21 浏览: 25
以下是3位全加器的VHDL代码:
```vhdl
entity full_adder is
port(a, b, cin: in bit;
sum, cout: out bit);
end full_adder;
architecture dataflow of full_adder is
begin
sum <= a xor b xor cin;
cout <= (a and b) or (cin and (a xor b));
end dataflow;
entity three_bit_adder is
port(x, y: in bit_vector(2 downto 0);
cin: in bit;
s: out bit_vector(2 downto 0);
cout: out bit);
end three_bit_adder;
architecture dataflow of three_bit_adder is
component full_adder
port(a, b, cin: in bit;
sum, cout: out bit);
end component;
signal c1, c2: bit;
begin
fa1: full_adder port map(x(0), y(0), cin, s(0), c1);
fa2: full_adder port map(x(1), y(1), c1, s(1), c2);
fa3: full_adder port map(x(2), y(2), c2, s(2), cout);
end dataflow;
```
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