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Die erste Schaltung
besteht aus zwei VHDL Dateien, der eigentlichen Schaltung und einer Testbench, mit der die Schaltung simuliert werden kann.
Die Testbench
- first_tb.vhd
library ieee; use ieee.std_logic_1164.all; -- Testbench for the first switch/led module -- The switches are switched... entity first_tb is end; architecture beh of first_tb is -- This is the component declaration component first port ( SW: in std_ulogic_vector(9 downto 0); LEDR: out std_ulogic_vector(9 downto 0) ); end component; -- Signal declaration for the switches and the leds signal switch, ledr : std_ulogic_vector(9 downto 0) := "0000000000"; begin -- Here the device under test is instantiated first_i0 : first port map ( SW => switch, LEDR => ledr); -- This is the process where the switch is switched. Note that the process -- always starts from the beginning. This process is not synthesizable because -- of the wait statement. schalter : process begin wait for 1 us; switch <= "0000000001"; wait for 3 us; switch <= "1000000000"; end process schalter; end; -- architecture
Die Schaltung
- first.vhd
library ieee; use ieee.std_logic_1164.all; -- Simple module that connects the SW switches to the LEDR lights entity first is port ( SW : in std_ulogic_vector(9 downto 0); LEDR : out std_ulogic_vector(9 downto 0)); -- red LEDs end first; architecture structure of first is begin LEDR <= SW; end structure;