Examples of using PSL for functional and formal verification of VHDL with GHDL (and SymbiYosys)
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.
 
 

93 lines
1.6 KiB

library ieee;
use ieee.std_logic_1164.all;
entity sequencer is
generic (
seq : string
);
port (
clk : in std_logic;
data : out std_logic
);
end entity sequencer;
architecture rtl of sequencer is
signal index : natural := seq'low;
function to_bit (a : in character) return std_logic is
variable ret : std_logic;
begin
case a is
when '0' | '_' => ret := '0';
when '1' | '-' => ret := '1';
when others => ret := 'X';
end case;
return ret;
end function to_bit;
begin
process (clk) is
begin
if rising_edge(clk) then
if (index < seq'high) then
index <= index + 1;
end if;
end if;
end process;
data <= to_bit(seq(index));
end architecture rtl;
library ieee;
use ieee.std_logic_1164.all;
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity issue is
port (
clk : in std_logic
);
end entity issue;
architecture psl of issue is
component sequencer is
generic (
seq : string
);
port (
clk : in std_logic;
data : out std_logic
);
end component sequencer;
signal a, b : std_logic;
begin
-- 0123456789012345
SEQ_A : sequencer generic map ("__-__-____-_____") port map (clk, a);
SEQ_B : sequencer generic map ("_______-______-_") port map (clk, b);
-- All is sensitive to rising edge of clk
default clock is rising_edge(clk);
-- This assertion holds
-- This assertion leads to a GHDL synthesis crash with bug report
EVENTUALLY_a : assert always (a -> eventually! b);
end architecture psl;