You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
50 lines
1.4 KiB
50 lines
1.4 KiB
library ieee;
|
|
use ieee.std_logic_1164.all;
|
|
|
|
use work.pkg.all;
|
|
|
|
|
|
entity psl_abort is
|
|
port (
|
|
clk : in std_logic
|
|
);
|
|
end entity psl_abort;
|
|
|
|
|
|
architecture psl of psl_abort is
|
|
|
|
signal a, b, c, d : std_logic;
|
|
|
|
begin
|
|
|
|
d <= '0', '1' after 1100 ps, '0' after 1400 ps;
|
|
|
|
-- 0123456789
|
|
SEQ_A : sequencer generic map ("-___-_____") port map (clk, a);
|
|
SEQ_B : sequencer generic map ("_______-__") port map (clk, b);
|
|
SEQ_C : sequencer generic map ("-_________") port map (clk, c);
|
|
-- D : _|________
|
|
|
|
-- All is sensitive to rising edge of clk
|
|
default clock is rising_edge(clk);
|
|
|
|
-- This assertion doesn't hold at cycle 4
|
|
WITHOUT_ABORT_a : assert (always a -> next (b before a));
|
|
|
|
-- This assertion holds
|
|
WITH_ABORT_0_a : assert (always a -> next (b before a)) abort c;
|
|
|
|
-- In simulation this assertion should also hold, but it does not
|
|
-- GHDL seems to implement abort as sync_abort instead of async_abort
|
|
-- See 1850-2010 6.2.1.5.1 abort, async_abort, and sync_abort
|
|
-- In formal this assertion fails as d is 0 all the time
|
|
WITH_ABORT_1_a : assert (always a -> next (b before a)) abort 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;
|