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117 lines
2.2 KiB
117 lines
2.2 KiB
library ieee;
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use ieee.std_logic_1164.all;
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entity sequencer is
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generic (
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seq : string
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);
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port (
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clk : in std_logic;
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data : out std_logic
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);
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end entity sequencer;
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architecture rtl of sequencer is
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signal index : natural := seq'low;
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function to_bit (a : in character) return std_logic is
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variable ret : std_logic;
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begin
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case a is
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when '0' | '_' => ret := '0';
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when '1' | '-' => ret := '1';
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when others => ret := 'X';
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end case;
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return ret;
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end function to_bit;
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begin
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process (clk) is
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begin
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if rising_edge(clk) then
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if (index < seq'high) then
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index <= index + 1;
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end if;
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end if;
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end process;
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data <= to_bit(seq(index));
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end architecture rtl;
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library ieee;
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use ieee.std_logic_1164.all;
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use ieee.numeric_std.all;
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entity issue is
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port (
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clk : in std_logic
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);
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end entity issue;
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architecture psl of issue is
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signal a, b : std_logic;
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begin
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-- 012345678
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SEQ_A : entity work.sequencer generic map ("_-____-__") port map (clk, a);
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SEQ_B : entity work.sequencer generic map ("__-____-_") port map (clk, b);
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default clock is rising_edge(clk);
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-- This works, but it's not that useful as even a simple negation
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-- leads to an error (see seq1)
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sequence seq (boolean d0, d1) is {d0; d1};
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TEST_0 : cover seq(a, b) report "TEST_0 hit";
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-- One could negate the parameter when calling the
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-- sequence, but this is not very intuitive
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TEST_1 : assert never seq(a, not b);
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-- This doesnt work:
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-- error: PSL declaration "a" not allowed in an expression
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sequence seq1 (boolean d0) is {not d0; d0 = true};
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TEST_2 : cover seq1(a) report "TEST_1 hit";
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end architecture psl;
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library ieee;
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use ieee.std_logic_1164.all;
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use std.env.all;
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entity test_issue is
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end entity test_issue;
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architecture sim of test_issue is
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signal clk : std_logic := '1';
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begin
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clk <= not clk after 500 ps;
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DUT : entity work.issue(psl) port map (clk);
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-- stop simulation after 10 cycles
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process
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variable index : natural := 10;
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begin
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loop
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wait until rising_edge(clk);
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index := index - 1;
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exit when index = 0;
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end loop;
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stop(0);
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end process;
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end architecture sim;
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