j_tribus.vhd

With shift add way to implement multiply harware circuit.

library ieee ;
use ieee.std_logic_1164.all ;
entity j_tribus is 
 port( triout1 : in std_logic_vector(7 downto 0) ;
       output_lsbn : in std_logic_vector( 1 downto 0) ;
       triout2 : in std_logic_vector(7 downto 0)  ;
       output_msbn : in std_logic_vector( 1 downto 0) ;
       tribus      : out std_logic_vector( 7 downto 0):="ZZZZZZZZ"  );
end j_tribus ;

architecture dataflow of j_tribus is
begin
    
    process (output_lsbn, output_msbn)
     begin 
      if ((output_lsbn = "00") and (output_msbn = "11")) then 
          tribus <= triout1 ;
      elsif   ((output_lsbn = "11" ) and (output_msbn = "00")) then 
          tribus <= triout2 ;
      else 
          tribus <= "ZZZZZZZZ" ;
      end if ;
     end process ; 
     
end dataflow ;