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VHDL Code for Booth Multiplier library ieee; use ieee.std_logic_1164.all ; use ieee.std_logic_unsigned.all;
library ieee; use ieee.std_logic_1164.all ; entity testbooth is end entity;
entity boothmult is port ( mpcd, mplr : in std_logic_vector(7 downto 0); result : out std_logic_vector(15 downto 0) ; start : in std_logic ); end entity ; architecture booth_arch of boothmult is begin process(start) variable br,nbr : std_logic_vector(7 downto 0); variable acqr : std_logic_vector(15 downto 0); variable qn1 : std_logic ; begin if(start'event and start = '1') then acqr(15 downto 8):= (others=>'0'); acqr(7 downto 0) := mpcd; br:= mplr ; nbr := (not mplr) + '1' ; qn1 := '0' ; else loop1 : for i in 7 downto 0 loop if( acqr(0) = '0' and qn1 = '0') then qn1 := acqr(0); acqr(14 downto 0) := acqr(15 downto 1) ; elsif ( acqr(0) = '0' and qn1 = '1') then acqr(15 downto 8) := acqr(15 downto 8) + br; qn1 := acqr(0); acqr(14 downto 0) := acqr(15 downto 1) ; elsif ( acqr(0) = '1' and qn1 = '0') then acqr(15 downto 8) := acqr(15 downto 8) + nbr; qn1 := acqr(0); acqr(14 downto 0) := acqr(15 downto 1) ; elsif ( acqr(0) = '1' and qn1 = '1') then qn1 := acqr(0); acqr(14 downto 0) := acqr(15 downto 1) ; end if ; end loop loop1; result <= acqr ; end if ; end process ; end booth_arch;
architecture test_arch of testbooth is component boothmult is port ( mpcd, mplr : in std_logic_vector(7 downto 0); result : out std_logic_vector(15 downto 0) ; start : in std_logic ); end component ; signal tmpcd, tmplr : std_logic_vector(7 downto 0); signal tresult : std_logic_vector(15 downto 0); signal tstart : std_logic := '0'; begin inst: boothmult port map (tmpcd, tmplr, tresult, tstart ); process begin tmpcd <= "11111110" ; tmplr <= "00000010" ; tstart <= '1'; wait for 1 ns; tstart <= '0'; wait for 10 ns ; tmpcd <= "00000101" ; tmplr <= "00000010" ; tstart <= '1'; wait for 1 ns; tstart <= '0'; wait for 10 ns ; end process; end test_arch ;
