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latch_tb.vhd (728B)


      1 entity latch_tb is
      2 end latch_tb;
      3 
      4 architecture behav of latch_tb is
      5 
      6 signal d1: bit;
      7 signal en1: bit;
      8 signal q1: bit;
      9 
     10 component latch is port (
     11 	d: in bit;
     12 	en: in bit;
     13 	q: out bit
     14 );
     15 end component;
     16 
     17 begin
     18 	uut: latch port map (
     19 		d => d1,
     20 		en => en1,
     21 		q => q1
     22 	);
     23 
     24 	process begin
     25 		en1 <= '1';
     26 		wait for 150 ns;
     27 		en1 <= '0';
     28 		wait for 250 ns;
     29 		en1 <= '1';
     30 		wait for 150 ns;
     31 		en1 <= '0';
     32 		wait for 250 ns;
     33 		en1 <= '1';
     34 		wait for 150 ns;
     35 		en1 <= '0';
     36 		wait for 250 ns;
     37 	end process;
     38 
     39 	process begin
     40 		d1 <= '1';
     41 		wait for 280 ns;
     42 		d1 <= '0';
     43 		wait for 300 ns;
     44 		d1 <= '1';
     45 		wait for 250 ns;
     46 		d1 <= '0';
     47 		wait for 150 ns;
     48 		d1 <= '1';
     49 		wait for 75 ns;
     50 		d1 <= '0';
     51 		wait for 150 ns;
     52 	end process;
     53 end behav;