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Altera_Forum's avatar
Altera_Forum
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13 years ago

how to correctly assign to these variables

1. Error (10500): VHDL syntax error at tether2.vhd(152) near text "IN"; expecting an identifier ("in" is a reserved keyword), or a string literal constant ff_tx_mod : IN STD_LOGIC_VECTOR...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

You need to use double quotes, " for a string.

constant preamble : STD_LOGIC_VECTOR (55 DOWNTO 0) := x"55555555555555";

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 ) );