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- 10th October 2006, 21:31 #1

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## t flip flop vhdl

Dear,

I want to write a VHDL code for a T-flip flop .can you help me with that.

regards

- 10th October 2006, 21:31

- 10th October 2006, 23:30 #2

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## vhdl code for t flip flop

Here's a T flip flop with reset

Code:library ieee; use ieee.std_logic_1164.all entity tff is port( clk: in std_logic; reset: in std_logic; t: in std_logic; q: out std_logic ); enf tff; architecture behave of tff is signal q_reg: std_logic; signal q_next: std_logic; begin process begin if (reset = '1') then q_reg <= '0'; elsif (clk'event and clk = '1') then q_reg <= q_next; end if; end process; q_next <= q_reg when t = '0' else not(q_reg); q <= q_reg; end behave;

A T flip flop has the following equation: Q+ = T`Q+TQ` which is basically a D flip flop with a XOR gate connected to D, with one input being T and the other the Q output.

-Jayson

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- 10th October 2006, 23:30

- 1st December 2010, 18:34 #3

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## Re: vhdl code for t flip flop

can anyone give the vhdl code on how to convert integer to binary?

can it be done using the structural model?

- 1st December 2010, 18:34

- 2nd December 2010, 05:17 #4

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## Re: VHDL code for a T-Flip Flop

I think this wiil be work

library ieee;

use ieee.std_logic_1164.all;

use ieee.numeric_std.all;

entity int2bin is

generic (N : integer := 64);-- Number of binary bits

port (

clk : in std_logic;

int : in integer;

bin : out std_logic_vector(N-1 downto 0)

);

end int2bin;

architecture behavior of int2bin is

signal count:integer;

signal d : integer;

signal b : std_logic_vector(N-1 downto 0);

begin

process(clk)

begin

if (clk'event and clk = '1') then

d <= 0;

b <= (others => '0');

L0: for i in 0 to int loop

if (d = int) then

bin <= b;

exit L0;

else

d <= d+1;

count <= 0;

for k in 0 to N-1 loop

if(count = 0) then

if(b(k) = '0') then

b(k) <= '1';

count <= 1;

else

b(k) <= '0';

end if;

end if;

end loop;

end if;

end loop L0;

bin <= b;

else

bin <= b;

end if;

end process;

end behavior;

let me know if any error

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- 2nd December 2010, 06:48 #5

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## Re: VHDL code for a T-Flip Flop

my_slv <= std_logic_vector(to_unsigned(my_int,my_slv'length) );

there really isn't a applicable structural model. A module could be made, but it would simply do the above.

Also, realize that integers are defined as 32b signed values. (unsigned "positives" are limited to 31b). This is annoying as FPGA's now have the capability for > 32b math.

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