+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
package gen_pkg is
- type alu_ops is (NOP, SUB, ADD, MUL, DIV, DONE);
+ subtype alu_ops is std_logic_vector(2 downto 0);
+ constant ALU_NOP : alu_ops := "000";
+ constant ALU_SUB : alu_ops := "001";
+ constant ALU_ADD : alu_ops := "010";
+ constant ALU_MUL : alu_ops := "011";
+ constant ALU_DIV : alu_ops := "100";
+ constant ALU_DONE : alu_ops := "101";
+
+ constant CBITS : integer := 32;
+ subtype csigned is signed((CBITS-1) downto 0);
+ --TODO: bei CBITS-1 gibts einen overflow :/
+ subtype cinteger is integer range -(2**(CBITS-2)) to ((2**(CBITS-2))-1);
+ function find_msb(a : csigned) return natural;
end package gen_pkg;
+package body gen_pkg is
+ function find_msb(a : csigned) return natural is
+ variable r : natural := 0;
+ begin
+ for i in (CBITS-1) downto 0 loop
+ exit when a(i) = '1';
+ r := r+1;
+ end loop;
+ return (CBITS - r);
+ end function find_msb;
+end package body gen_pkg;
+