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You need to use double quotes, " for a string.
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Ah, my bad. I just copied his line and didn't notice he'd used single quotes.
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Also, this is just a hex string, not a decimal integer. a std_logic_vector is not an integer, it is a collection of bits. To assign it from an integer, you need to convert it via the numeric_std package
constant preamble : STD_LOGIC_VECTOR (55 DOWNTO 0) := std_logic_vector( to_unsigned( 555555, 56 ) );
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True for older VHDL, but VHDL-1993 onwards will correctly convert the hex string to a std_logic_vector without needing to convert it explicitly. Not that yours is wrong, just two ways to skin this cat :). Personally I prefer the cleaner look of the direct assignment without lots of explicit type conversions.
Mark.
Honored Contributor
