为什么只能进行功能级仿真，别的仿真做不了？
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
-- Uncomment the following lines to use the declarations that are
-- provided for instantiating Xilinx primitive components.
--library UNISIM;
--use UNISIM.VComponents.all;
entity b_clk is
Port (
clk ,reset : in std_logic;
write: in std_logic ;
data :in std_logic_vector ( 0 to 7 );
tx : out std_logic
);
end b_clk;
architecture Behavioral of b_clk is
signal txclk , txdone ,txdata_ready ,txparity ,txtag1 ,txtag2 ,parity : std_logic ;
signal txreg ,txhold : std_logic_vector ( 0 to 7 ) ;
begin
p1 :process ( clk , reset )
variable txcnt :std_logic_vector ( 0 to 2 ) ;
begin
if reset = '1' then --产生一个时钟
txclk <= '0' ;
txcnt := "000";
elsif clk = '1' AND clk'event then
if txcnt = "000" then
txclk <= not txclk ;
end if ;
txcnt := txcnt + "001";
end if ;
end process ;
p2 : process ( reset ,txclk ) --串并转换并奇偶校验
begin
if reset = '1'then
txreg <= ( others => '0' );
txparity <= '0' ;
tx <= '0';
elsif txclk = '1' and txclk'event then
if ( txdone and txdata_ready ) = '1' then
txreg <= txhold ;
txparity <= '1' ;
txtag1 <= '1' ;
txtag2 <= '1' ;
tx<= '0' ;
else
txreg <= txreg ( 1 to 7 ) & txtag1 ;
txtag1 <= txtag2;
txtag2 <= '0' ;
txparity <= txparity xor txreg ( 0 ) ;
if txdone = '1' then
tx <= '1' ;
elsif parity = '1' then
tx <= txparity ;
else
tx <= txreg ( 0 ) ;
end if ;
end if ;
end if ;
end process ;
txdone <= not ( txreg ( 0 ) or txreg ( 1 ) or txreg ( 2 ) or txreg ( 3 ) or txreg ( 4 ) or
txreg ( 5 ) or txreg ( 6 ) or txreg ( 7 ) or txtag1 or txtag2 ) ;
parity <=txreg( 1 ) and not ( txreg ( 2 ) or txreg ( 3 ) or txreg ( 4 ) or txreg (5) or txreg( 6 ) or txreg ( 7 ) or txtag1 or txtag2 ) ;
p3 : process ( reset , clk )
variable txdone1, wr1 ,wr2 :std_logic ;
begin
if reset = '1' then
wr1 := '0' ;
wr2 := '0' ;
txdata_ready <='0';
elsif clk'event and clk = '1' then
if wr1 = '0' and wr2 = '1' then
txdata_ready <= '1' ;
elsif txdone = '0' and txdone1 = '1' then
txdata_ready <= '0' ;
end if ;
wr2 := wr1 ;
wr1 := write ;
txdone1 := txdone ;
end if ;
end process;
txhold <= data when write = '1' else txhold ;
end Behavioral;
为什么只能进行功能级仿真，别的仿真做不了?
用的什么工具?出错信息是什么?
为什么只能进行功能级仿真，别的仿真做不了?
用modelsim，没有出错信息，就是没有输出，我忘了说，还能做p&r仿真，结果是正确的
为什么只能进行功能级仿真，别的仿真做不了?
那你想得到什么?如何叫没有输出?不是很明白你的问题
为什么只能进行功能级仿真，别的仿真做不了?
我是说应该有数据输出，就是应该有波形而不是输出一条红线
为什么只能进行功能级仿真，别的仿真做不了?
那你的测试激励呢?
为什么只能进行功能级仿真，别的仿真做不了?
这是我的测试激励：
-- VHDL Test Bench Created from source file b_clk.vhd -- 10:45:44 09/17/2003
--
-- Notes:
-- This testbench has been automatically generated using types std_logic and
-- std_logic_vector for the ports of the unit under test. Xilinx recommends
-- that these types always be used for the top-level I/O of a design in order
-- to guarantee that the testbench will bind correctly to the post-implementation
-- simulation model.
--
LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
USE ieee.numeric_std.ALL;
ENTITY testbench IS
END testbench;
ARCHITECTURE behavior OF testbench IS
COMPONENT b_clk
PORT(
clk : IN std_logic;
reset : IN std_logic;
write : IN std_logic;
data : IN std_logic_vector(0 to 7);
tx : OUT std_logic
);
END COMPONENT;
SIGNAL clk : std_logic;
SIGNAL reset : std_logic;
SIGNAL write : std_logic;
SIGNAL data : std_logic_vector(0 to 7);
SIGNAL tx : std_logic;
BEGIN
uut: b_clk PORT MAP(
clk => clk,
reset => reset,
write => write,
data => data,
tx => tx
);
-- *** Test Bench - User Defined Section ***
tb : PROCESS
BEGIN
clk <= '1' ;
reset <= '1';
write <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
reset <= '0' ;
wait for 25 ns ;
clk <='0';
wait for 25 ns ;
clk <= '1';
data <= "10100010";
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
write <= '0';
wait for 25 ns ;
clk <= '0';
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clk <= '1' ;
write <= '1' ;
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clk <= '0' ;
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clk <= '1' ;
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wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
write <= '0';
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
write <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
data<="10100100";
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
write <= '1' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;
wait for 25 ns ;
clk <= '1' ;
wait for 25 ns ;
clk <= '0' ;<