bitconvalu.vbe

来自「i need of vhdl code for 32-bit risc proc」· VBE 代码 · 共 32 行

ENTITY bitconvalu IS
PORT (
bit1 : IN BIT;
bit2 : IN BIT;
bit3 : IN BIT;
bit4 : IN BIT;
outvec : OUT bit_vector(3 downto 0)
);
END bitconvalu;

ARCHITECTURE bitconvalu_arch OF bitconvalu IS

BEGIN
 with bit4&bit3&bit2&bit1 select
 outvec <= b"0000" when b"0000",
       b"0001" when b"0001",
       b"0010" when b"0010",
       b"0011" when b"0011",
       b"0100" when b"0100",
       b"0101" when b"0101",
       b"0110" when b"0110",
       b"0111" when b"0111",
       b"1000" when b"1000",
       b"1001" when b"1001",
       b"1010" when b"1010",
       b"1011" when b"1011",
       b"1100" when b"1100",
       b"1101" when b"1101",
       b"1110" when b"1110",
       b"1111" when b"1111";
END;