?? common.vhd
字號:
library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.numeric_std.all;
package common is
constant YES : std_logic := '1';
constant NO : std_logic := '0';
constant HI : std_logic := '1';
constant LO : std_logic := '0';
constant ONE : std_logic := '1';
constant ZERO : std_logic := '0';
function boolean2stdlogic(b : in boolean) return std_logic;
function log2(v : in natural) return natural;
end package common;
library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.numeric_std.all;
package body common is
function boolean2stdlogic(b : in boolean) return std_logic is
variable s : std_logic;
begin
if b then
s := '1';
else
s := '0';
end if;
return s;
end function boolean2stdlogic;
function log2(v : in natural) return natural is
variable n : natural;
variable logn : natural;
begin
n := 1;
for i in 0 to 128 loop
logn := i;
exit when (n >= v);
n := n * 2;
end loop;
return logn;
end function log2;
end package body common;
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