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csm_lastblock.vhd
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csm_lastblock.vhd
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--Ultimo bloque del multiplicador carry save
--Difiere de los anteriores bloques porque si propaga acarreo en la fila
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity csm_lastblock is
port (
lsum : in std_logic_vector (14 downto 0);
lcar : in std_logic_vector (14 downto 0);
resl : out std_logic_vector (15 downto 0)
);
end csm_lastblock;
architecture ripple_carry_arch of csm_lastblock is
COMPONENT FA
port (
a : in std_logic;
b : in std_logic;
ci : in std_logic;
co : out std_logic;
sum : out std_logic
);
END COMPONENT ;
signal carry : std_logic_vector(13 downto 0) := "00000000000000";
begin
fa0 : FA
PORT MAP (
a => lsum(1),
b => lcar(0),
ci => '0', --half adder
co => carry(0),
sum => resl(0));
fa1 : FA
PORT MAP (
a => lsum(2),
b => lcar(1),
ci => carry(0),
co => carry(1),
sum => resl(1));
fa2 : FA
PORT MAP (
a => lsum(3),
b => lcar(2),
ci => carry(1),
co => carry(2),
sum => resl(2));
fa3 : FA
PORT MAP (
a => lsum(4),
b => lcar(3),
ci => carry(2),
co => carry(3),
sum => resl(3));
fa4 : FA
PORT MAP (
a => lsum(5),
b => lcar(4),
ci => carry(3),
co => carry(4),
sum => resl(4));
fa5 : FA
PORT MAP (
a => lsum(6),
b => lcar(5),
ci => carry(4),
co => carry(5),
sum => resl(5));
fa6 : FA
PORT MAP (
a => lsum(7),
b => lcar(6),
ci => carry(5),
co => carry(6),
sum => resl(6));
fa7 : FA
PORT MAP (
a => lsum(8),
b => lcar(7),
ci => carry(6),
co => carry(7),
sum => resl(7));
fa8 : FA
PORT MAP (
a => lsum(9),
b => lcar(8),
ci => carry(7),
co => carry(8),
sum => resl(8));
fa9 : FA
PORT MAP (
a => lsum(10),
b => lcar(9),
ci => carry(8),
co => carry(9),
sum => resl(9));
fa10 : FA
PORT MAP (
a => lsum(11),
b => lcar(10),
ci => carry(9),
co => carry(10),
sum => resl(10));
fa11 : FA
PORT MAP (
a => lsum(12),
b => lcar(11),
ci => carry(10),
co => carry(11),
sum => resl(11));
fa12 : FA
PORT MAP (
a => lsum(13),
b => lcar(12),
ci => carry(11),
co => carry(12),
sum => resl(12));
fa13 : FA
PORT MAP (
a => lsum(14),
b => lcar(13),
ci => carry(12),
co => carry(13),
sum => resl(13));
fa14 : FA
PORT MAP (
a => '0', --half adder
b => lcar(14),
ci => carry(13),
co => resl(15),
sum => resl(14));
end ripple_carry_arch;