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[/] [raytrac/] [trunk/] [fpbranch/] [mul/] [mul2.vhd] - Rev 116
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------------------------------------------------ --! @file mul2.vhd --! @brief RayTrac Mantissa Multiplier --! @author Julián Andrés Guarín Reyes -------------------------------------------------- -- RAYTRAC (FP BRANCH) -- Author Julian Andres Guarin -- mmp.vhd -- This file is part of raytrac. -- -- raytrac is free software: you can redistribute it and/or modify -- it under the terms of the GNU General Public License as published by -- the Free Software Foundation, either version 3 of the License, or -- (at your option) any later version. -- -- raytrac is distributed in the hope that it will be useful, -- but WITHOUT ANY WARRANTY; without even the implied warranty of -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -- GNU General Public License for more details. -- -- You should have received a copy of the GNU General Public License -- along with raytrac. If not, see <http://www.gnu.org/licenses/> library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_arith.all; use ieee.std_logic_unsigned.all; entity mul2 is port ( clk : in std_logic; a32,b32 : in std_logic_vector(31 downto 0); p32 : out std_logic_vector(31 downto 0) ); end mul2; architecture mul2_arch of mul2 is component lpm_mult generic ( lpm_hint : string; lpm_pipeline : natural; lpm_representation : string; lpm_type : string; lpm_widtha : natural; lpm_widthb : natural; lpm_widthp : natural ); port ( dataa : in std_logic_vector ( lpm_widtha-1 downto 0 ); datab : in std_logic_vector ( lpm_widthb-1 downto 0 ); result : out std_logic_vector ( lpm_widthp-1 downto 0 ) ); end component; --Stage 0 signals signal s0sga,s0sgb,s0zrs,s1sgr,s2sgr:std_logic; signal s0exa,s0exb,s1exp,s2exp:std_logic_vector(7 downto 0); signal s0exp : std_logic_vector(8 downto 0); signal s0uma,s0umb:std_logic_vector(22 downto 0); signal s0ad,s0bc,s1ad,s1bc:std_logic_vector(23 downto 0); signal s0ac:std_logic_vector(35 downto 0); signal s1ac,s1umu:std_logic_vector(35 downto 0); signal s2umu:std_logic_vector(24 downto 0); begin process(clk) begin if clk'event and clk='1' then --! Registro de entrada s0sga <= a32(31); s0sgb <= b32(31); s0exa <= a32(30 downto 23); s0exb <= b32(30 downto 23); s0uma <= a32(22 downto 0); s0umb <= b32(22 downto 0); --! Etapa 0 multiplicacion de la mantissa, suma de los exponentes y multiplicación de los signos. s1sgr <= s0sga xor s0sgb; s1ad <= s0ad; s1bc <= s0bc; s1ac <= s0ac; s1exp <= s0exp(7 downto 0); --! Etapa 1 Sumas parciales s2umu <= s1umu(35 downto 11); s2sgr <= s1sgr; s2exp <= s1exp; --! Etapa 2 entregar el resultado p32(31) <= s2sgr; p32(30 downto 23) <= s2exp+s2umu(24); if s2umu(24) ='1' then p32(22 downto 0) <= s2umu(23 downto 1); else p32(22 downto 0) <= s2umu(22 downto 0); end if; end if; end process; --! Combinatorial Gremlin Etapa 0 : multiplicacion de la mantissa, suma de los exponentes y multiplicación de los signos. --! Multipliers mult18x18ac:lpm_mult generic map ("DEDICATED_MULTIPLIER_CIRCUITRY=YES,MAXIMIZE_SPEED=9",0,"UNSIGNED","LPM_MULT",18,18,36) port map (s0zrs&s0uma(22 downto 6),s0zrs&s0umb(22 downto 6),s0ac); mult18x6ad:lpm_mult generic map ("DEDICATED_MULTIPLIER_CIRCUITRY=YES,MAXIMIZE_SPEED=9",0,"UNSIGNED","LPM_MULT",18,6,24) port map (s0zrs&s0uma(22 downto 6),s0umb(5 downto 0),s0ad); mult18x6bc:lpm_mult generic map ("DEDICATED_MULTIPLIER_CIRCUITRY=YES,MAXIMIZE_SPEED=9",0,"UNSIGNED","LPM_MULT",18,6,24) port map (s0zrs&s0umb(22 downto 6),s0uma(5 downto 0),s0bc); --! Exponent Addition process (s0sga,s0sgb,s0exa,s0exb) variable i8s0exa,i8s0exb: integer range 0 to 255; begin i8s0exa:=conv_integer(s0exa); i8s0exb:=conv_integer(s0exb); if i8s0exa = 0 or i8s0exb = 0 then s0exp <= (others => '0'); s0zrs <= '0'; else s0zrs<='1'; s0exp <= conv_std_logic_vector(i8s0exb+i8s0exa+129,9); end if; end process; --! Etapa 1: Suma parcial de la multiplicacion. Suma del exponente process(s1ac,s1ad,s1bc) begin s1umu <= s1ac+s1ad(23 downto 6)+s1bc(23 downto 6); end process; end mul2_arch;
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