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+\begin{verbatim}
+architecture Behavioral of Add4Bits is
+
+ signal bufA : STD_LOGIC;
+ signal bufB : STD_LOGIC;
+ signal bufC : STD_LOGIC;
+
+ component Add1BitA is Port (
+ X : in STD_LOGIC;
+ Y : in STD_LOGIC;
+ Ci: in STD_LOGIC;
+ O : out STD_LOGIC;
+ Co: out STD_LOGIC);
+ end component;
+
+ component Add1BitB is Port (
+ X : in STD_LOGIC;
+ Y : in STD_LOGIC;
+ Ci: in STD_LOGIC;
+ O : out STD_LOGIC;
+ Co: out STD_LOGIC);
+ end component;
+
+begin
+
+ first : Add1BitB port map (
+ X => A(0),
+ Y => B(0),
+ Ci => C,
+ O => R(0),
+ Co => bufA);
+
+ sec : Add1BitB port map (
+ X => A(1),
+ Y => B(1),
+ Ci => bufA,
+ O => R(1),
+ Co => bufB);
+
+ third : Add1BitA port map (
+ X => A(2),
+ Y => B(2),
+ Ci => bufB,
+ O => R(2),
+ Co => bufC);
+
+ fourth : Add1BitA port map (
+ X => A(3),
+ Y => B(3),
+ Ci => bufC,
+ O => R(3),
+ Co => Rc);
+
+end Behavioral;
+\end{verbatim}