diff --git a/src/socbridge_driver.vhd b/src/socbridge_driver.vhd
index c92981c..f0b9b77 100644
--- a/src/socbridge_driver.vhd
+++ b/src/socbridge_driver.vhd
@@ -74,7 +74,7 @@ architecture rtl of socbridge_driver is
 
 
   signal ext_in_rec : ext_protocol_t;
-  signal ext_out_rec : ext_protocol_t;
+  signal ext_out_data_cmd : std_logic_vector(interface_inst.socbridge.payload_width - 1 downto 0);
   signal next_state : state_t;
   signal curr_command : command_t;
   signal curr_command_bits : std_logic_vector(4 downto 0);
@@ -84,13 +84,14 @@ architecture rtl of socbridge_driver is
 begin
   comb_proc: process(ext_in, int_out, st)
   begin
+    -- Outputs 
+    ext_out <= create_io_type_out_from_ext_protocol(st.ext_out_reg);
+    int_in.payload <= st.ext_in_reg.data;
+
+    -- Helpful Bindings --
     ext_in_rec <= create_ext_protocol_from_io_type_in(ext_in);
-    ext_out <= create_io_type_out_from_ext_protocol(ext_out_rec);
-    next_parity_out <= calc_parity(int_out.payload);
-    ext_out.payload <= st.ext_out_reg.data;
-    ext_out.control <= st.ext_out_reg.clk & st.ext_out_reg.parity;
     curr_response_bits <= ext_in_rec.data(7 downto 3);
-    -- Create combinational bindings for command/response types
+    next_parity_out <= calc_parity(ext_out_data_cmd);
     with curr_command select
       curr_command_bits <= "00000" when NO_OP,
                            "10000" when WRITE_ADD,
@@ -131,7 +132,7 @@ begin
 --       |           |              |                           
 --       +-----------+--------------+                 
 --                                                            
---- Next State Assignment --- 
+  --- Next State Assignment --- 
     case st.curr_state is
       when IDLE => 
         if curr_command = WRITE or curr_command = WRITE_ADD then
@@ -174,7 +175,28 @@ begin
       -- Right now, we receive only one single word at a time for simplicity
         next_state <= IDLE;
     end case;
-  
+    
+  --- Combinatorial output based on current state ---
+    ext_out_data_cmd <= (others => '0');
+    int_in.is_full_out <= '1';
+    int_in.write_enable_in <= '0';
+    case st.curr_state is
+      when IDLE => 
+      when RESET =>
+      when TX_HEADER =>
+        curr_command <= WRITE;
+        ext_out_data_cmd <= curr_command_bits & "001";
+      when TX_BODY =>
+        ext_out_data_cmd <= int_out.payload;
+        int_in.is_full_out <= '0';
+      when TX_ACK =>
+      when RX_HEADER =>
+        curr_command <= READ;
+        ext_out_data_cmd <= curr_command_bits & "001";
+      when RX_RESPONSE =>
+      when RX_BODY =>
+    end case;
+
   end process comb_proc;
   -- Process updating internal registers based on primary clock
   seq_proc: process(ext_in_rec.clk, rst)
diff --git a/src/socbridge_driver_tb.vhd b/src/socbridge_driver_tb.vhd
index 239400d..17dc5d1 100644
--- a/src/socbridge_driver_tb.vhd
+++ b/src/socbridge_driver_tb.vhd
@@ -33,7 +33,7 @@ architecture tb of socbridge_driver_tb is
     );
   end component socbridge_driver;
   signal clk : std_logic := '0';
-  signal rst : std_logic := '0';
+  signal rst : std_logic;
   signal ext_in  :  ext_socbridge_in_t;
   signal ext_out :  ext_socbridge_out_t;
   signal int_in  :  int_socbridge_in_t;
@@ -57,12 +57,11 @@ begin
       int_out => int_out
   );
 
+  ext_in.control(1) <= clk;
   real_clk_proc: process
   begin
-    clk <= '0';
     for x in 0 to SIMULATION_CYCLE_COUNT*2 loop
       clk <= not clk;
-      ext_in.control(1) <= clk;
       wait for CLK_PERIOD / 2;
     end loop;
     wait;
@@ -105,9 +104,11 @@ begin
   external_stimulus: process
   begin
     rst <= '1';
+    curr_word <= "00000000"; 
     wait for 3 * CLK_PERIOD;
     rst <= '0';
-    curr_word <= "00000000"; 
+    wait for CLK_PERIOD / 2;
+    -- stimulus goes here
     wait for CLK_PERIOD*10;
     wait;
   end process external_stimulus;
@@ -115,22 +116,23 @@ begin
 
   internal_stimulus: process
   begin
+    int_out.is_full_in <= '0';
+    int_out.write_enable_out <= '0';
     wait for 3 * CLK_PERIOD;
-    wait for CLK_PERIOD / 2;
+    -- stimulus goes here
+    int_out.write_enable_out <= '1';
     int_out.payload <= "00000000";
-    wait for CLK_PERIOD;
-    int_out.payload <= "00000001";
-    wait for CLK_PERIOD;
-    int_out.payload <= "00000011";
-    wait for CLK_PERIOD;
-    int_out.payload <= "00000111";
-    wait for CLK_PERIOD;
-    int_out.payload <= "00001111";
-    wait for CLK_PERIOD;
-    int_out.payload <= "00011111";
-    wait for CLK_PERIOD;
-    int_out.payload <= "00111111";
-    wait for CLK_PERIOD;
+    wait until int_in.is_full_out = '0';
+    int_out.payload <= "00000010";
+    wait until int_in.is_full_out = '0';
+    int_out.payload <= "00000100";
+    wait until int_in.is_full_out = '0';
+    int_out.payload <= "00001000";
+    wait until int_in.is_full_out = '0';
+    int_out.payload <= "00010000";
+    wait until int_in.is_full_out = '0';
+    int_out.payload <= "00100000";
+    wait until int_in.is_full_out = '0';
     wait;
   end process internal_stimulus;