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3。1。RS觸發(fā)器的設(shè)計

library ieee;
use ieee.std_logic_1164.all;
entity rsff is
   port(r,s:in std_logic;
        q,qb:out std_logic);
end rsff;

architecture rtl of rsff is
signal q_temp,qb_tempLstd_logic;
begin
process(r,s)
begin
  if(s=''1''and r=''0'')then
  q_temp<=''0'';
 qb_temp<=''1'';
 elsif(s=''0''and r=''1'') then
 q_temp<=''1'';
qb_temp<=''0'';
else
q_temp<=q_temp;
  qb_temp<=qb_temp;
end if;
end process;
q<=q_temp;
qb<=qb_temp;
end rtl;

3。2主從JK觸發(fā)器的設(shè)計

源程序：
library ieee;
use ieee.std_logic_1164.all;
  entity jkff is
  port(j,k,cp,r,s:in std_logic;
          q,pb:out std_logic);
end jkff;
architecture rtl of kff is
signal q_temp,qb_temp:std_logic;
begin
process(j,k,cp)
begin
if(r=''0'' and s=''1'')then
   q_temp<=''0'';
   qb_temp<=''1'';
elsif(r=''1''and s=''0'')then
   q_temp<=''1'';
  qb_temp<=''0'';
elsif(cp''event and cp=''0'')then
   if(j=''0'' and k=''1'')then
      q_temp<=not q_temp;
     qb_temp<=not qb_temp;
  end if;
end if;

q<=q_temp;
qb<=qb_temp;
end process;
end rtl;

3。3,D觸發(fā)器的設(shè)計

源程序：
 
library ieee;
usre ieee.std_logic)_1164.all;
 
entity dff is
  port(d,cp,r,s:in std_logic;
          q,qb:out std_logic);
 end dff;
architecture rtl of dff is
signal q_temp,qb_temp:std_logic;
begin
   process(cp)
   begin
if(r=''0'' and s=''1'')then
   q_temp<=''0'';
  qb_temp<=''1'';
elsif(r=''1'' and s=''0'')then
  q_temp<=''1'';
  qb_temp<=''0'';
elsif(r=''0'' and s=''0'')then
  q_temp<=q_temp;
 qb_temp<=qb_temp;
elsif(cp''event and cp=''0'')then
  q_temp<=d;
 qb_temp<=not d;
end if
end process;
q<=q_temp;
qb<=qb_temp;
end rtl;