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Diffstat (limited to 'testsuite/synth/conv01/pos01.vhdl')
-rw-r--r-- | testsuite/synth/conv01/pos01.vhdl | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/testsuite/synth/conv01/pos01.vhdl b/testsuite/synth/conv01/pos01.vhdl new file mode 100644 index 000000000..94b943a98 --- /dev/null +++ b/testsuite/synth/conv01/pos01.vhdl @@ -0,0 +1,48 @@ +library ieee; +use ieee.std_logic_1164.all; +use ieee.numeric_std.all; + +entity pos01 is + generic (g_en : boolean := True); + port (clk : std_logic; + rst : std_logic; + en : std_logic; + st : out std_logic_vector(1 downto 0)); +end pos01; + +architecture behav of pos01 is + type t_state is (IDLE, WAIT1, WAIT2, DONE); + signal s : t_state; + constant c1 : integer := t_state'pos(WAIT2); + constant c2 : integer := boolean'pos(g_en); +begin + process (clk) is + begin + if rising_edge(clk) then + if rst = '1' then + s <= IDLE; + else + case s is + when IDLE => + if en = '1' then + s <= WAIT1; + end if; + when WAIT1 => + if en = '1' then + s <= WAIT2; + end if; + when WAIT2 => + if en = '1' then + s <= DONE; + end if; + when DONE => + null; + end case; + end if; + end if; + end process; + + st <= std_logic_vector(to_unsigned(t_state'pos(s), 2)); +end behav; + + |