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pertrl's avatar
pertrl
Icon for New Contributor rankNew Contributor
2 years ago
Solved

Schematic Symbol Parameter in Hex

Hello, how can I input a hexadecimal value in the parameter table of a block diagram/schematic file (.bdf)? behind the block is the following VHDL code: entity reg is generic ( constant REG_B...
Hdl
  • ShengN_altera's avatar
    ShengN_altera
    2 years ago

    Hi,


    Done testing. Use the following for example:

    addr : std_logic_vector(15 downto 0) := x"FFFF"


    Then change line 16 from:

    signal reg : std_logic_vector(15 downto 0) := std_logic_vector(to_unsigned(addr, 16));

    to:

    signal reg : std_logic_vector(15 downto 0) := addr;


    You'll be able to use Hexadecimal type for example value AAAA


    Thanks,

    Best Regards,

    Sheng


ShengN_altera's avatar
ShengN_altera
Icon for Super Contributor rankSuper Contributor
2 years ago

Hi,


To input a hexadecimal value in the parameter table of a block diagram/schematic file (.bdf), set the (Type) to either Auto or Hexadecimal then under (Value) straight away give a value for example like: a, not need the symbol x""


Thanks,

Regards,

Sheng


  • pertrl's avatar
    pertrl
    Icon for New Contributor rankNew Contributor
    2 years ago

    This does not work. here is some test code:

    library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;

entity test2 is
	generic (
		addr : natural := 16#4000#
	);
	port (
		i_clk : in std_logic;
		o	   : out std_logic_vector(15 downto 0)
	);
end;

architecture arch of test2 is
	signal reg : std_logic_vector(15 downto 0) := std_logic_vector(to_unsigned(addr, 16));
begin
	o <= reg;
end;

    generating a symbol from this code results in the following table:

    Parameter | Value | Type
addr      | 16384 | Signed Integer

    and synthesizes correctly to

    using

    Parameter  | Value | Type
addr       | 4000  | Hexadecimal

    results in an error:

    Error (10515): VHDL type mismatch error at /asd.vhd(8): natural type does not match string literal

    using

    Parameter | Value | Type
addr      | 4000  | Auto

    synthesizes incorrectly to: