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s1a_jed.vhd
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s1a_jed.vhd
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library ieee;
use ieee.numeric_std.all;
use ieee.std_logic_1164.all;
entity s1a_jed is
port(
clock: in std_logic;
input: in std_logic_vector(7 downto 0);
output: out std_logic_vector(5 downto 0)
);
end s1a_jed;
architecture behaviour of s1a_jed is
constant st0: std_logic_vector(4 downto 0) := "11100";
constant st1: std_logic_vector(4 downto 0) := "11101";
constant st2: std_logic_vector(4 downto 0) := "11000";
constant st5: std_logic_vector(4 downto 0) := "01000";
constant st3: std_logic_vector(4 downto 0) := "11001";
constant st4: std_logic_vector(4 downto 0) := "11110";
constant st6: std_logic_vector(4 downto 0) := "10111";
constant st7: std_logic_vector(4 downto 0) := "00001";
constant st12: std_logic_vector(4 downto 0) := "01101";
constant st13: std_logic_vector(4 downto 0) := "01100";
constant st8: std_logic_vector(4 downto 0) := "10100";
constant st11: std_logic_vector(4 downto 0) := "00000";
constant st15: std_logic_vector(4 downto 0) := "10110";
constant st9: std_logic_vector(4 downto 0) := "10000";
constant st10: std_logic_vector(4 downto 0) := "10001";
constant st14: std_logic_vector(4 downto 0) := "10101";
constant st16: std_logic_vector(4 downto 0) := "10011";
constant st17: std_logic_vector(4 downto 0) := "00100";
constant st18: std_logic_vector(4 downto 0) := "10010";
constant st19: std_logic_vector(4 downto 0) := "00101";
signal current_state, next_state: std_logic_vector(4 downto 0);
begin
process(clock) begin
if rising_edge(clock) then current_state <= next_state;
end if;
end process;
process(input, current_state) begin
next_state <= "-----"; output <= "------";
case current_state is
when st0 =>
if std_match(input, "-1-00---") then next_state <= st0; output <= "000000";
elsif std_match(input, "00--0---") then next_state <= st0; output <= "000000";
elsif std_match(input, "-0--1---") then next_state <= st1; output <= "000000";
elsif std_match(input, "-1-01---") then next_state <= st1; output <= "000000";
elsif std_match(input, "01-10---") then next_state <= st2; output <= "000000";
elsif std_match(input, "11-10---") then next_state <= st5; output <= "000000";
elsif std_match(input, "-1-11---") then next_state <= st3; output <= "000000";
elsif std_match(input, "10--0---") then next_state <= st4; output <= "000000";
end if;
when st1 =>
if std_match(input, "-0------") then next_state <= st6; output <= "000000";
elsif std_match(input, "-1-0----") then next_state <= st6; output <= "000000";
elsif std_match(input, "-1-1----") then next_state <= st7; output <= "000000";
end if;
when st2 =>
if std_match(input, "0---0---") then next_state <= st2; output <= "000000";
elsif std_match(input, "----1---") then next_state <= st3; output <= "000000";
elsif std_match(input, "1---0---") then next_state <= st5; output <= "000000";
end if;
when st3 =>
if std_match(input, "--------") then next_state <= st7; output <= "000000";
end if;
when st4 =>
if std_match(input, "--0-----") then next_state <= st12; output <= "000000";
elsif std_match(input, "--1-----") then next_state <= st13; output <= "000000";
end if;
when st5 =>
if std_match(input, "--------") then next_state <= st13; output <= "000000";
end if;
when st6 =>
if std_match(input, "-0--1---") then next_state <= st6; output <= "000000";
elsif std_match(input, "-1-01---") then next_state <= st6; output <= "000000";
elsif std_match(input, "-1-11---") then next_state <= st7; output <= "000000";
elsif std_match(input, "00--0---") then next_state <= st8; output <= "000000";
elsif std_match(input, "-1-00---") then next_state <= st8; output <= "000000";
elsif std_match(input, "11-10---") then next_state <= st11; output <= "000000";
elsif std_match(input, "10--0---") then next_state <= st15; output <= "000000";
elsif std_match(input, "01-10---") then next_state <= st9; output <= "000000";
end if;
when st7 =>
if std_match(input, "----1---") then next_state <= st7; output <= "000000";
elsif std_match(input, "0---0---") then next_state <= st9; output <= "000000";
elsif std_match(input, "1---0---") then next_state <= st11; output <= "000000";
end if;
when st8 =>
if std_match(input, "00--00--") then next_state <= st8; output <= "000000";
elsif std_match(input, "00---1-0") then next_state <= st8; output <= "000000";
elsif std_match(input, "-1-000--") then next_state <= st8; output <= "000000";
elsif std_match(input, "-1-0-1-0") then next_state <= st8; output <= "000000";
elsif std_match(input, "00--01-1") then next_state <= st0; output <= "000000";
elsif std_match(input, "-1-001-1") then next_state <= st0; output <= "000000";
elsif std_match(input, "-0--11-1") then next_state <= st1; output <= "000000";
elsif std_match(input, "-1-011-1") then next_state <= st1; output <= "000000";
elsif std_match(input, "10--01-1") then next_state <= st4; output <= "000000";
elsif std_match(input, "01-100--") then next_state <= st9; output <= "000000";
elsif std_match(input, "01-1-1--") then next_state <= st9; output <= "000000";
elsif std_match(input, "01-110--") then next_state <= st10; output <= "000000";
elsif std_match(input, "11-1----") then next_state <= st11; output <= "000000";
elsif std_match(input, "100-10--") then next_state <= st14; output <= "000000";
elsif std_match(input, "-1-010--") then next_state <= st14; output <= "000000";
elsif std_match(input, "101-101-") then next_state <= st14; output <= "000000";
elsif std_match(input, "00--10--") then next_state <= st14; output <= "000000";
elsif std_match(input, "10--00--") then next_state <= st15; output <= "000000";
elsif std_match(input, "10---1-0") then next_state <= st15; output <= "000000";
elsif std_match(input, "101-100-") then next_state <= st15; output <= "000000";
end if;
when st9 =>
if std_match(input, "0---00--") then next_state <= st9; output <= "000000";
elsif std_match(input, "0----1-0") then next_state <= st9; output <= "000000";
elsif std_match(input, "0---01-1") then next_state <= st2; output <= "000000";
elsif std_match(input, "0---10--") then next_state <= st10; output <= "000000";
elsif std_match(input, "0---11-1") then next_state <= st3; output <= "000000";
elsif std_match(input, "1----0--") then next_state <= st11; output <= "000000";
elsif std_match(input, "1----1-0") then next_state <= st11; output <= "000000";
elsif std_match(input, "1----1-1") then next_state <= st5; output <= "000000";
end if;
when st10 =>
if std_match(input, "------0-") then next_state <= st16; output <= "000000";
elsif std_match(input, "------1-") then next_state <= st7; output <= "000000";
end if;
when st11 =>
if std_match(input, "-----1-1") then next_state <= st13; output <= "000000";
elsif std_match(input, "-----0--") then next_state <= st17; output <= "000000";
elsif std_match(input, "-----1-0") then next_state <= st17; output <= "000000";
end if;
when st12 =>
if std_match(input, "1-0-----") then next_state <= st12; output <= "000000";
elsif std_match(input, "1-1-----") then next_state <= st13; output <= "000000";
elsif std_match(input, "0---1---") then next_state <= st1; output <= "000000";
elsif std_match(input, "0---0---") then next_state <= st0; output <= "000000";
end if;
when st13 =>
if std_match(input, "1-------") then next_state <= st13; output <= "000000";
elsif std_match(input, "0---0---") then next_state <= st0; output <= "000000";
elsif std_match(input, "0---1---") then next_state <= st1; output <= "000000";
end if;
when st14 =>
if std_match(input, "---0--1-") then next_state <= st6; output <= "000000";
elsif std_match(input, "---0--0-") then next_state <= st18; output <= "000000";
elsif std_match(input, "-0-1----") then next_state <= st18; output <= "000000";
elsif std_match(input, "-1-1----") then next_state <= st16; output <= "000000";
end if;
when st15 =>
if std_match(input, "--0--0--") then next_state <= st19; output <= "000000";
elsif std_match(input, "--0--1-0") then next_state <= st19; output <= "000000";
elsif std_match(input, "--0--1-1") then next_state <= st12; output <= "000000";
elsif std_match(input, "--1-----") then next_state <= st17; output <= "000000";
end if;
when st16 =>
if std_match(input, "----1-0-") then next_state <= st16; output <= "000000";
elsif std_match(input, "----1-1-") then next_state <= st7; output <= "000000";
elsif std_match(input, "1---0---") then next_state <= st11; output <= "000000";
elsif std_match(input, "0---0---") then next_state <= st9; output <= "000000";
end if;
when st17 =>
if std_match(input, "1----0--") then next_state <= st17; output <= "000000";
elsif std_match(input, "1----1-0") then next_state <= st17; output <= "000000";
elsif std_match(input, "0---00--") then next_state <= st8; output <= "000000";
elsif std_match(input, "0----1-0") then next_state <= st8; output <= "000000";
elsif std_match(input, "0---01-1") then next_state <= st0; output <= "000000";
elsif std_match(input, "0---11-1") then next_state <= st1; output <= "000000";
elsif std_match(input, "1----1-1") then next_state <= st13; output <= "000000";
elsif std_match(input, "0---10--") then next_state <= st14; output <= "000000";
end if;
when st18 =>
if std_match(input, "----1-1-") then next_state <= st6; output <= "000000";
elsif std_match(input, "00--0---") then next_state <= st8; output <= "000000";
elsif std_match(input, "-1-00---") then next_state <= st8; output <= "000000";
elsif std_match(input, "01-10---") then next_state <= st9; output <= "000000";
elsif std_match(input, "11-10---") then next_state <= st11; output <= "000000";
elsif std_match(input, "10--0---") then next_state <= st15; output <= "000000";
elsif std_match(input, "-1-11-0-") then next_state <= st16; output <= "000000";
elsif std_match(input, "-0--1-0-") then next_state <= st18; output <= "000000";
elsif std_match(input, "-1-01-0-") then next_state <= st18; output <= "000000";
end if;
when st19 =>
if std_match(input, "1-0--0--") then next_state <= st19; output <= "000000";
elsif std_match(input, "1-0--1-0") then next_state <= st19; output <= "000000";
elsif std_match(input, "0---00--") then next_state <= st8; output <= "000000";
elsif std_match(input, "0----1-0") then next_state <= st8; output <= "000000";
elsif std_match(input, "0---01-1") then next_state <= st0; output <= "000000";
elsif std_match(input, "0---10--") then next_state <= st14; output <= "000000";
elsif std_match(input, "0---11-1") then next_state <= st1; output <= "000000";
elsif std_match(input, "1-0--1-1") then next_state <= st12; output <= "000000";
elsif std_match(input, "1-1-----") then next_state <= st17; output <= "000000";
end if;
when others => next_state <= "-----"; output <= "------";
end case;
end process;
end behaviour;