I'm having trouble getting the following report statement to work:
report "ERROR: instruction address '" & CONV_INTEGER(a(7 downto 2)) & "' out of memory range." severity failure;
Where a is of type in std_logic_vector(31 downto 0).
The error I'm getting is:
No feasible entries for infix operator "&".
I'm wanting to print out a string, concatenate the integer value, then concatenate another string.
What am I doing wrong?
An example of using 'IMAGE:
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity foo is
end entity;
architecture fum of foo is
signal a: std_logic_vector (31 downto 0) := x"deadbeef";
begin
process (a)
begin
report "ERROR: instruction address '" &
-- CONV_INTEGER(a(7 downto 2)) &
INTEGER'IMAGE(to_integer(unsigned (a(7 downto 2)))) &
"' out of memory range." ;-- severity failure;
end process;
end architecture;
I used package numeric_std. The principle is the same, the name of the conversion routine is different.
'IMAGE is a predefined attribute that returns a string representation of a value of a type (in this case an INTEGER).
Your failure message was because there isn't an "&" concatenation operator available that knows how to concatenate an integer onto a string, so instead you provide the string image of the integer.
When run:
ghdl -r foo
foo.vhdl:13:9:@0ms:(report note): ERROR: instruction address '59' out of memory range.
And bits 7 downto 2 are "111011" from the bit string initialization, which just happens to equal 59 when represented as an integer.