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Rev 17 |
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architecture Behavioral of Alu is
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architecture Behavioral of Alu is
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begin
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begin
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--! Behavior description of combinational circuit (Can not infer any FF(Flip flop)) of the Alu
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--! Behavior description of combinational circuit (Can not infer any FF(Flip flop)) of the Alu
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process (A,B,sel) is
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process (A,B,sel) is
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variable mulResult : std_logic_vector(((nBits*2) - 1)downto 0);
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begin
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begin
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case sel is
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case sel is
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when alu_pass =>
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when alu_pass =>
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--Pass operation
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--Pass operation
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S <= A;
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S <= A;
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--Decrement operation
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--Decrement operation
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S <= A - conv_std_logic_vector(1, n+1);
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S <= A - conv_std_logic_vector(1, n+1);
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when alu_mul =>
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when alu_mul =>
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--Multiplication operation
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--Multiplication operation
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S <= A * B;
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mulResult := A * B;
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S <= mulResult((nBits - 1) downto 0);
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when alu_and =>
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when alu_and =>
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--And operation
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--And operation
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S <= A and B;
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S <= A and B;
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