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171 lines
4.3 KiB
171 lines
4.3 KiB
library ieee;
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use ieee.std_logic_1164.all;
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use ieee.numeric_std.all;
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use ieee.math_real.all;
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package UtilsP is
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function and_reduce (data : in std_logic_vector) return std_logic;
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function and_reduce (data : in boolean_vector) return boolean;
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function or_reduce (data : in std_logic_vector) return std_logic;
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function or_reduce (data : in boolean_vector) return boolean;
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function xor_reduce (data : in std_logic_vector) return std_logic;
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function even_parity (data : in std_logic_vector) return std_logic;
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function odd_parity (data : in std_logic_vector) return std_logic;
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function count_ones (data : in std_logic_vector) return natural;
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function one_hot (data : in std_logic_vector) return boolean;
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function is_unknown (data : in std_logic_vector) return boolean;
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function uint_to_slv (data: in natural; len : in positive) return std_logic_vector;
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function slv_to_uint (data: in std_logic_vector) return natural;
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function uint_bitsize(data : in natural) return natural;
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end package UtilsP;
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package body UtilsP is
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function and_reduce (data : in std_logic_vector) return std_logic is
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begin
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for i in data'range loop
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if data(i) = '0' then
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return '0';
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end if;
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end loop;
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return '1';
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end function and_reduce;
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function and_reduce (data : in boolean_vector) return boolean is
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begin
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for i in data'range loop
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if (not(data(i))) then
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return false;
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end if;
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end loop;
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return true;
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end function and_reduce;
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function or_reduce (data : in std_logic_vector) return std_logic is
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begin
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for i in data'range loop
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if data(i) = '1' then
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return '1';
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end if;
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end loop;
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return '0';
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end function or_reduce;
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function or_reduce (data : in boolean_vector) return boolean is
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begin
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for i in data'range loop
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if data(i) then
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return true;
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end if;
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end loop;
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return false;
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end function or_reduce;
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function xor_reduce (data : in std_logic_vector) return std_logic is
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variable v_return : std_logic := '0';
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begin
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for i in data'range loop
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v_return := v_return xor data(i);
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end loop;
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return v_return;
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end function xor_reduce;
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function even_parity (data : in std_logic_vector) return std_logic is
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begin
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return xor_reduce(data);
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end function even_parity;
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function odd_parity (data : in std_logic_vector) return std_logic is
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begin
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return not(xor_reduce(data));
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end function odd_parity;
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function count_ones (data : in std_logic_vector) return natural is
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variable v_return : natural := 0;
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begin
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for i in data'range loop
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v_return := v_return + 1;
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end loop;
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return v_return;
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end function count_ones;
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function one_hot (data : in std_logic_vector) return boolean is
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begin
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return count_ones(data) = 1;
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end function one_hot;
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function is_unknown (data : in std_logic_vector) return boolean is
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begin
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for i in data'range loop
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if (data(i) = 'U') then
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return true;
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end if;
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end loop;
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end function is_unknown;
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function uint_to_slv (data: in natural; len : in positive) return std_logic_vector is
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begin
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assert len >= uint_bitsize(data)
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report "Warning: std_logic_vector result truncated"
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severity warning;
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return std_logic_vector(to_unsigned(data, len));
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end function uint_to_slv;
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function slv_to_uint (data: in std_logic_vector) return natural is
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begin
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if data'ascending then
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assert data'length <= 31 or or_reduce(data(data'left to data'right-31)) = '0'
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report "WARNING: integer result overflow"
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severity warning;
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else
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assert data'length <= 31 or or_reduce(data(data'left downto data'right+31)) = '0'
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report "WARNING: integer result overflow"
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severity warning;
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end if;
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return to_integer(unsigned(data));
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end function slv_to_uint;
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function uint_bitsize(data : in natural) return natural is
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variable v_nlz : natural := 0;
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variable v_data : unsigned(30 downto 0) := to_unsigned(data, 31);
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begin
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if (data = 0) then
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return 1;
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end if;
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for i in 30 downto 0 loop
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if(v_data(i) /= '0') then
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exit;
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else
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v_nlz := v_nlz + 1;
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end if;
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end loop;
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return 31 - v_nlz;
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end function uint_bitsize;
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end package body UtilsP;
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