/
float_alu_pkg.vhd
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float_alu_pkg.vhd
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library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use work.float_type_definitions_pkg.all;
use work.float_arithmetic_operations_pkg.all;
use work.float_adder_pkg.all;
use work.float_multiplier_pkg.all;
use work.normalizer_pkg.all;
use work.denormalizer_pkg.all;
package float_alu_pkg is
------------------------------------------------------------------------
-- these can be used for externally time the operations, see the testbench
constant mult_pipeline_depth : natural := 3;
constant add_pipeline_depth : natural := 1+2+number_of_normalizer_pipeline_stages + number_of_denormalizer_pipeline_stages;
constant madd_pipeline_depth : natural := 1+2+3+number_of_normalizer_pipeline_stages + number_of_denormalizer_pipeline_stages;
constant int_to_float_pipeline_depth : natural := number_of_normalizer_pipeline_stages + 1;
constant float_to_int_pipeline_depth : natural := number_of_denormalizer_pipeline_stages + 1;
type float_alu_timing_parameters is record
add_pipeline_depth : natural;
mult_pipeline_depth : natural;
madd_pipeline_depth : natural;
int_to_float_pipeline_depth : natural;
float_to_int_pipeline_depth : natural;
end record;
constant alu_timing : float_alu_timing_parameters :=(
add_pipeline_depth ,
mult_pipeline_depth ,
madd_pipeline_depth ,
int_to_float_pipeline_depth ,
float_to_int_pipeline_depth);
------------------------------------------------------------------------
type float_alu_record is record
float_adder : float_adder_record ;
adder_normalizer : normalizer_record ;
float_multiplier : float_multiplier_record ;
multiplier_bypass_pipeline : float_array(2 downto 0);
int_to_float_pipeline : std_logic_vector(int_to_float_pipeline_depth-1 downto 0);
float_to_int_pipeline : std_logic_vector(float_to_int_pipeline_depth-1 downto 0);
madd_pipeline : std_logic_vector(madd_pipeline_depth downto 0);
end record;
constant init_float_alu : float_alu_record := (
init_float_adder ,
init_normalizer ,
init_float_multiplier ,
(others => zero) ,
(others => '0') ,
(others => '0') ,
(others => '0') );
------------------------------------------------------------------------
procedure create_float_alu (
signal self : inout float_alu_record);
------------------------------------------------------------------------
------------------------------------------------------------------------
procedure multiply (
signal self : inout float_alu_record;
left, right : float_record);
procedure multiply_and_increment_counter (
signal self : inout float_alu_record;
signal counter_to_be_incremented : inout integer;
left, right : float_record);
------------------------------------------------------------------------
function multiplier_is_ready ( self : float_alu_record)
return boolean;
------------------------------------------------------------------------
function get_multiplier_result ( self : float_alu_record)
return float_record;
------------------------------------------------------------------------
------------------------------------------------------------------------
procedure add (
signal self : inout float_alu_record;
left, right : float_record);
procedure add_and_increment_counter (
signal self : inout float_alu_record;
signal counter_to_be_incremented : inout integer;
left, right : float_record);
procedure subtract (
signal self : inout float_alu_record;
left, right : float_record);
procedure subtract_and_increment_counter (
signal self : inout float_alu_record;
signal counter_to_be_incremented : inout integer;
left, right : float_record);
------------------------------------------------------------------------
function add_is_ready ( self : float_alu_record)
return boolean;
------------------------------------------------------------------------
function get_add_result ( self : float_alu_record)
return float_record;
------------------------------------------------------------------------
procedure convert_float_to_integer (
signal self : out float_alu_record;
number_to_be_converted : float_record;
desired_radix : in integer);
------------------------------------------------------------------------
procedure convert_integer_to_float (
signal self : out float_alu_record;
number_to_be_converted : in integer;
radix_of_converted_number : in integer);
------------------------------------------------------------------------
function int_to_float_is_ready ( self : float_alu_record)
return boolean;
------------------------------------------------------------------------
function get_converted_float ( self : float_alu_record)
return float_record;
------------------------------------------------------------------------
function float_to_int_is_ready ( self : float_alu_record)
return boolean;
------------------------------------------------------------------------
function get_converted_integer ( self : float_alu_record)
return integer;
------------------------------------------------------------------------
procedure madd (
signal self : inout float_alu_record;
a,x,b : float_record);
------------------------------------------------------------------------
procedure fmac (
signal self : inout float_alu_record;
a,x,b : float_record);
------------------------------------------------------------------------
end package float_alu_pkg;
package body float_alu_pkg is
------------------------------------------------------------------------
procedure create_float_alu
(
signal self : inout float_alu_record
)
is
begin
create_denormalizer(self.float_adder.denormalizer);
self.float_adder.adder_result <= (self.float_adder.denormalizer.feedthrough_pipeline(number_of_denormalizer_pipeline_stages) + self.float_adder.denormalizer.denormalizer_pipeline(number_of_denormalizer_pipeline_stages));
self.float_adder.adder_is_done <= denormalizer_is_ready(self.float_adder.denormalizer) and self.float_to_int_pipeline(self.float_to_int_pipeline'left) = '0';
create_normalizer(self.adder_normalizer);
create_float_multiplier(self.float_multiplier);
if self.float_adder.adder_is_done then
request_normalizer(self.adder_normalizer, self.float_adder.adder_result);
end if;
if float_multiplier_is_ready(self.float_multiplier) and self.madd_pipeline(mult_pipeline_depth-1) = '1' then
request_add(self.float_adder, get_multiplier_result(self.float_multiplier), self.multiplier_bypass_pipeline(self.multiplier_bypass_pipeline'left));
end if;
self.multiplier_bypass_pipeline <= self.multiplier_bypass_pipeline(self.multiplier_bypass_pipeline'left-1 downto 0) & zero;
self.int_to_float_pipeline <= self.int_to_float_pipeline(self.int_to_float_pipeline'left-1 downto 0) & '0';
self.float_to_int_pipeline <= self.float_to_int_pipeline(self.float_to_int_pipeline'left-1 downto 0) & '0';
self.madd_pipeline <= self.madd_pipeline(self.madd_pipeline'left-1 downto 0) & '0';
end procedure;
------------------------------------------------------------------------
------------------------------------------------------------------------
procedure multiply
(
signal self : inout float_alu_record;
left, right : float_record
) is
begin
request_float_multiplier(
self.float_multiplier,
left, right);
end multiply;
procedure multiply_and_increment_counter
(
signal self : inout float_alu_record;
signal counter_to_be_incremented : inout integer;
left, right : float_record
) is
begin
counter_to_be_incremented <= counter_to_be_incremented + 1;
request_float_multiplier(
self.float_multiplier,
left, right);
end multiply_and_increment_counter;
------------------------------------------------------------------------
------------------------------------------------------------------------
function multiplier_is_ready
(
self : float_alu_record
)
return boolean
is
begin
return float_multiplier_is_ready(self.float_multiplier);
end multiplier_is_ready;
------------------------------------------------------------------------
function get_multiplier_result
(
self : float_alu_record
)
return float_record
is
begin
return get_multiplier_result(self.float_multiplier);
end get_multiplier_result;
------------------------------------------------------------------------
------------------------------------------------------------------------
procedure add
(
signal self : inout float_alu_record;
left, right : float_record
) is
begin
request_add(self.float_adder, left, right);
end add;
procedure add_and_increment_counter
(
signal self : inout float_alu_record;
signal counter_to_be_incremented : inout integer;
left, right : float_record
) is
begin
counter_to_be_incremented <= counter_to_be_incremented + 1;
request_add(self.float_adder, left, right);
end add_and_increment_counter;
------------------------------------------------------------------------
procedure subtract
(
signal self : inout float_alu_record;
left, right : float_record
) is
begin
request_add(self.float_adder, left, -right);
end subtract;
procedure subtract_and_increment_counter
(
signal self : inout float_alu_record;
signal counter_to_be_incremented : inout integer;
left, right : float_record
) is
begin
counter_to_be_incremented <= counter_to_be_incremented + 1;
request_add(self.float_adder, left, -right);
end subtract_and_increment_counter;
------------------------------------------------------------------------
function add_is_ready
(
self : float_alu_record
)
return boolean
is
begin
return normalizer_is_ready(self.adder_normalizer) and self.int_to_float_pipeline(number_of_normalizer_pipeline_stages) = '0';
end add_is_ready;
------------------------------------------------------------------------
function get_add_result
(
self : float_alu_record
)
return float_record
is
begin
return get_normalizer_result(self.adder_normalizer);
end get_add_result;
------------------------------------------------------------------------
procedure convert_float_to_integer
(
signal self : out float_alu_record;
number_to_be_converted : float_record;
desired_radix : in integer
) is
begin
request_scaling(self.float_adder.denormalizer, number_to_be_converted, desired_radix);
self.float_to_int_pipeline(0) <= '1';
end convert_float_to_integer;
--------------------------------------------------
procedure convert_integer_to_float
(
signal self : out float_alu_record;
number_to_be_converted : in integer;
radix_of_converted_number : in integer
) is
begin
to_float(self.adder_normalizer, number_to_be_converted, radix_of_converted_number);
self.int_to_float_pipeline(0) <= '1';
end convert_integer_to_float;
------------------------------------------------------------------------
function int_to_float_is_ready
(
self : float_alu_record
)
return boolean
is
begin
return self.int_to_float_pipeline(number_of_normalizer_pipeline_stages) = '1';
end int_to_float_is_ready;
------------------------------------------------------------------------
function get_converted_float
(
self : float_alu_record
)
return float_record
is
begin
return get_normalizer_result(self.adder_normalizer);
end get_converted_float;
--------------------------------------------------
function float_to_int_is_ready
(
self : float_alu_record
)
return boolean
is
begin
return self.float_to_int_pipeline(number_of_denormalizer_pipeline_stages) = '1';
end float_to_int_is_ready;
--------------------------------------------------
function get_converted_integer
(
self : float_alu_record
)
return integer
is
begin
return get_integer(self.float_adder.denormalizer);
end get_converted_integer;
--------------------------------------------------
procedure madd
(
signal self : inout float_alu_record;
a,x,b : float_record
) is
begin
self.float_multiplier.shift_register(0) <= '1';
self.float_multiplier.left <= a;
self.float_multiplier.right <= x;
self.multiplier_bypass_pipeline(0) <= b;
self.madd_pipeline(0) <= '1';
end madd;
--------------------------------------------------
procedure fmac
(
signal self : inout float_alu_record;
a,x,b : float_record
) is
begin
self.float_multiplier.shift_register(0) <= '1';
self.float_multiplier.left <= a;
self.float_multiplier.right <= x;
self.multiplier_bypass_pipeline(0) <= b;
self.madd_pipeline(0) <= '1';
end fmac;
--------------------------------------------------
end package body float_alu_pkg;