psl_with_ghdl/src/psl_next.vhd

library ieee;
  use ieee.std_logic_1164.all;

use work.pkg.all;


entity psl_next is
  port (
    clk : in std_logic
  );
end entity psl_next;


architecture psl of psl_next is

  signal a, b : std_logic;
  signal c, d : std_logic;

begin


  --                              012345678901
  SEQ_A : sequencer generic map ("_-__--__-__") port map (clk, a);
  SEQ_B : sequencer generic map ("_--__--__--") port map (clk, b);

  --                              012345678901
  SEQ_C : sequencer generic map ("_-__--__-__") port map (clk, c);
  SEQ_D : sequencer generic map ("_--__-___--") port map (clk, d);


  -- All is sensitive to rising edge of clk
  default clock is rising_edge(clk);

  -- This assertion holds
  NEXT_0_a : assert always (a -> next b);

  -- This assertion doesn't hold at cycle 6
  NEXT_1_a : assert always (c -> next d);

  -- Stop simulation after longest running sequencer is finished
  -- Simulation only code by using pragmas
  -- synthesis translate_off
  stop_sim(clk, 12);
  -- synthesis translate_on


end architecture psl;