diff --git a/syn/DE10-Nano/top.qsf b/syn/DE10-Nano/top.qsf
index 5a288dc..bbdb19f 100644
--- a/syn/DE10-Nano/top.qsf
+++ b/syn/DE10-Nano/top.qsf
@@ -47,9 +47,7 @@ set_global_assignment -name MIN_CORE_JUNCTION_TEMP "-40"
 set_global_assignment -name MAX_CORE_JUNCTION_TEMP 100
 set_global_assignment -name POWER_PRESET_COOLING_SOLUTION "23 MM HEAT SINK WITH 200 LFPM AIRFLOW"
 set_global_assignment -name POWER_BOARD_THERMAL_MODEL "NONE (CONSERVATIVE)"
-set_global_assignment -name PARTITION_NETLIST_TYPE SOURCE -section_id Top
-set_global_assignment -name PARTITION_FITTER_PRESERVATION_LEVEL PLACEMENT_AND_ROUTING -section_id Top
-set_global_assignment -name PARTITION_COLOR 16764057 -section_id Top
+set_global_assignment -name VHDL_FILE ../test6.vhd -hdl_version VHDL_2008
 set_global_assignment -name SDC_FILE ../top.sdc
 set_global_assignment -name VHDL_FILE ../test_top.vhd -hdl_version VHDL_2008
 set_global_assignment -name VHDL_FILE ../../src/Avalon_MM_wrapper.vhd -hdl_version VHDL_2008
@@ -96,4 +94,7 @@ set_global_assignment -name VHDL_FILE ../../src/rtps_config_package.vhd -hdl_ver
 set_global_assignment -name VHDL_FILE ../syn_config.vhd -hdl_version VHDL_2008
 set_global_assignment -name VHDL_FILE ../../src/rtps_package.vhd -hdl_version VHDL_2008
 set_global_assignment -name VHDL_FILE ../../src/math_pkg.vhd -hdl_version VHDL_2008
+set_global_assignment -name PARTITION_NETLIST_TYPE SOURCE -section_id Top
+set_global_assignment -name PARTITION_FITTER_PRESERVATION_LEVEL PLACEMENT_AND_ROUTING -section_id Top
+set_global_assignment -name PARTITION_COLOR 16764057 -section_id Top
 set_instance_assignment -name PARTITION_HIERARCHY root_partition -to | -section_id Top
\ No newline at end of file
diff --git a/syn/test6.vhd b/syn/test6.vhd
new file mode 100644
index 0000000..6aba448
--- /dev/null
+++ b/syn/test6.vhd
@@ -0,0 +1,151 @@
+-- altera vhdl_input_version vhdl_2008
+-- XXX: QSYS Fix (https://www.intel.com/content/www/us/en/support/programmable/articles/000079458.html)
+
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+use work.test_package.all;
+
+-- Test synthesis of array indexing
+
+entity test6 is
+    port (
+        clk             : in std_logic;
+        reset           : in std_logic;
+        input1          : in TEST_ENUM;
+        input2          : in TEST_ENUM;
+        input3          : in TEST_ENUM;
+        input4          : in std_logic;
+        input5          : in std_logic;
+        output          : out std_logic
+    );
+end entity;
+
+architecture arch of test6 is
+    
+    type STAGE_TYPE is (IN1, IN2, IN3);
+    
+    signal stage : STAGE_TYPE;
+    
+begin
+    
+--    process (all)
+--        variable tmp_bool : boolean;
+--    begin
+--        if rising_edge(clk) then
+--            if (reset = '1') then
+--                output  <= '0';
+--            else
+--                tmp_bool := TRUE;
+--                
+--                case (input1) is
+--                    when A =>
+--                        if (input4 = '1') then
+--                            tmp_bool    := FALSE;
+--                        end if;
+--                    when B =>
+--                        if (input5 = '1') then
+--                            tmp_bool    := FALSE;
+--                        end if;
+--                    when C =>
+--                        tmp_bool    := FALSE;
+--                    when others =>
+--                        null;
+--                end case;
+--                
+--                case (input2) is
+--                    when C =>
+--                        if (input4 = '1') then
+--                            tmp_bool    := FALSE;
+--                        end if;
+--                    when others =>
+--                        null;
+--                end case;
+--                
+--                case (input3) is
+--                    when A =>
+--                        tmp_bool    := FALSE;
+--                    when D =>
+--                        if (input4 = '0' and input5 = '1') then
+--                            tmp_bool    := FALSE;
+--                        end if;
+--                    when others =>
+--                        null;
+--                end case;
+--                
+--                if (tmp_bool) then
+--                    output  <= '1';
+--                else
+--                    output  <= '0';
+--                end if;
+--            end if;
+--        end if;
+--    end process;
+    
+    process (all)
+    begin
+        if rising_edge(clk) then
+            if (reset = '1') then
+                output  <= '0';
+                stage   <= IN1;
+            else
+                
+                case (stage) is
+                    when IN1 =>
+                        -- DEFAULT
+                        stage   <= IN2;
+                        
+                        case (input1) is
+                            when A =>
+                                if (input4 = '1') then
+                                    output  <= '0';
+                                    stage   <= IN1;
+                                end if;
+                            when B =>
+                                if (input5 = '1') then
+                                    output  <= '0';
+                                    stage   <= IN1;
+                                end if;
+                            when C =>
+                                output  <= '0';
+                                stage   <= IN1;
+                            when others =>
+                                null;
+                        end case;
+                    when IN2 =>
+                        -- DEFAULT
+                        stage   <= IN3;
+                        
+                        case (input2) is
+                            when C =>
+                                if (input4 = '1') then
+                                    output  <= '0';
+                                    stage   <= IN1;
+                                end if;
+                            when others =>
+                                null;
+                        end case;
+                    when IN3 =>
+                        -- DEFAULT
+                        stage   <= IN1;
+                        output  <= '1';
+                        
+                        case (input3) is
+                            when A =>
+                                output  <= '0';
+                                stage   <= IN1;
+                            when D =>
+                                if (input4 = '0' and input5 = '1') then
+                                    output  <= '0';
+                                    stage   <= IN1;
+                                end if;
+                            when others =>
+                                null;
+                        end case;
+                end case;
+            end if;
+        end if;
+    end process;
+    
+end architecture;
diff --git a/syn/test_package.vhd b/syn/test_package.vhd
index a1dd2ea..99c722d 100644
--- a/syn/test_package.vhd
+++ b/syn/test_package.vhd
@@ -31,6 +31,8 @@ package test_package is
     
     function gen_domain_ids (user_id : USER_DOMAIN_ID_TYPE) return DOMAIN_ID_TYPE;
     
+    type TEST_ENUM is (A, B, C, D, E);
+    
     
     
 end package;