Examples of using PSL for functional and formal verification of VHDL with GHDL (and SymbiYosys)
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library ieee;
use ieee.std_logic_1164.all;
use work.pkg.all;
entity psl_next_3 is
port (
clk : in std_logic
);
end entity psl_next_3;
architecture psl of psl_next_3 is
signal a, b : std_logic;
signal c, d : std_logic;
signal e, f : std_logic;
begin
-- 01234567890
SEQ_A : sequencer generic map ("__-_-______") port map (clk, a);
SEQ_B : sequencer generic map ("_____-_-___") port map (clk, b);
-- 01234567890
SEQ_C : sequencer generic map ("__-_-______") port map (clk, c);
SEQ_D : sequencer generic map ("_____-_____") port map (clk, d);
-- 01234567890
SEQ_E : sequencer generic map ("__-_-______") port map (clk, e);
SEQ_F : sequencer generic map ("_____-----_") port map (clk, f);
-- All is sensitive to rising edge of clk
default clock is rising_edge(clk);
-- This assertion holds
NEXT_0_a : assert always (a -> next[3] (b));
-- This assertion doesn't hold at cycle 7
NEXT_1_a : assert always (c -> next[3] (d));
-- This assertion holds
NEXT_2_a : assert always (e -> next[3] (f));
end architecture psl;