Bit_8: bit_vector(7 downto 0) := B"1111_1111" -- equivalent to "11111111"
Bit_8 : bit_vector(7 downto 0) := X"FF" -- equivalent to B"1111_1111"
Bit_9 : bit_vector(8 downto 0) := O"777" -- equivalent to B"111_111_111"
Bit_12: bit_vector(11 downto 0) := X"777" -- equivalent to B"0111_0111_0111"
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