VHDL source code covers T Flipflop code
VHDL Code
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
entity TFF1 is
Port ( t,clk,rst : in STD_LOGIC;
q : inout STD_LOGIC);
end TFF1;
architecture Behavioral of TFF1 is
signal div:std_logic_vector(22 downto 0);
signal clkd:std_logic;
begin
process(clk)
begin
if rising_edge(clk)then
div<= div+1;
end if;
end process;
clkd<=div(20);
process(clkd,rst)
begin
if(rst='1')then
q<='0';
elsif (clkd'event and clkd='1' and t='1') then
q<= not q;
else q<=q;
end if;
end process;
end Behavioral;