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VHDL Testbench 1
library ieee;
use ieee.std_logic_1164.all;
use std.textio.all;
use ieee.std_logic_textio.all;
use ieee.std_logic_1164.all;
entity Foo is
end entity Foo;
architecture Struct of Foo is
signal wclk : std_logic;
signal we : std_logic;
signal lwe : std_logic;
signal done : boolean;
signal counter : natural := 0;
begin
process (wclk, we)
begin
if wclk'event and wclk='1' then
lwe <= we;
end if;
end process;
we <=
'0' when counter=0 else
'1' when counter=1 else
'1' when counter=2 else
'0' when counter=3 else
'0' when counter=4 else
'1' when counter=5 else
'0' when counter=6 else
'0' when counter=7 else '0';
process (wclk) begin
if rising_edge(wclk) then
counter <= counter + 1;
end if;
end process;
done <= counter >= 20;
process begin
while not done loop
wclk <= '1';
wait for 5 ns;
wclk <= '0';
wait for 5 ns;
end loop;
wait;
end process;
end Struct;
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