Further tiny minimizations by storing aforementioned state in reserved bits in manager memory

src/manager/management_unit.vhd

@@ -53,20 +53,22 @@ begin
   manager_to_socbridge_driver.ready <= '1';
   manager_to_socbridge_driver.data <= pack(manager_state.memory(local_word_address));
   manager_to_socbridge_driver.valid <= '1';
-  word_address  <= local_word_address;
+  word_address <= local_word_address;
   manager_to_controller.cmd <= cmd;
 end process comb_proc;
 
 -- tre sorters sätt att avsluta en skrivning:
 -- timeout om vi villha det
--- en lastbit genooom axi interface
+-- en lastbit genom axi interface
 -- vi har fått all data vi begärde.
 
 seq_proc: process(clk)
 begin
   if rising_edge(clk) then
     if rst = '1' then
-      manager_state <= manager_state_reset_val;
+      manager_state.data_out <= manager_word_reset_val;
+      manager_state.memory(0).reserved(0) <= '0';
+      manager_state.memory(1).reserved(0) <= '0';
     else
       -- Write data from SoCBridge driver to address
       if socbridge_driver_to_manager.valid = '1' then
@@ -78,20 +80,20 @@ begin
       -- Is the controller done executing an instruction
       else
         if controller_to_manager.done_reading = '1' then
-          manager_state.memory(0) <= manager_word_reset_val;
+          manager_state.memory(0).reserved(0) <= '0';
         end if;
         if controller_to_manager.done_writing = '1' then
-          manager_state.memory(1) <= manager_word_reset_val;
+          manager_state.memory(1).reserved(0) <= '0';
         end if;
       end if;
       -- Is there a read instruction in memory
-      if pack(read_address) /= empty_word and controller_to_manager.ready = '1' and controller_to_manager.done_reading = '0' then
+      if read_address.reserved(0) = '1' and controller_to_manager.ready = '1' and controller_to_manager.done_reading = '0' then
         manager_to_controller.address <= read_address.address & "0000000000";
         manager_to_controller.driver_id <= "1"; -- Only supprts one driver at present
         manager_to_controller.seq_mem_access_count <= 2**to_integer(unsigned(read_address.size)) * 2**10;
         cmd <= "10";
       -- Is there a write instruction in memory
-      elsif pack(write_address) /= empty_word and controller_to_manager.ready = '1' and controller_to_manager.done_writing = '0'then
+      elsif write_address.reserved(0) = '1' and controller_to_manager.ready = '1' and controller_to_manager.done_writing = '0'then
         manager_to_controller.address <= write_address.address & "0000000000";
         manager_to_controller.driver_id <= "1"; -- Only supports one driver at present
         manager_to_controller.seq_mem_access_count <= 2**to_integer(unsigned(read_address.size)) * 2**10;

src/manager/management_unit_pkg.vhd

@@ -16,7 +16,8 @@ package management_types is
     reserved: std_logic_vector(WORD_SIZE - 1 - (22 + 4 + 3) downto 0);
   end record manager_word_t;
   constant empty_word : std_logic_vector(WORD_SIZE - 1 downto 0) := (others => '0');
-  constant mem_words : natural := 64;
+  constant mem_words : natural := 2;
+  constant min_bits_to_determine_address : natural := natural(CEIL(LOG2(real(mem_words))));
   constant address_mask : std_logic_vector(WORD_SIZE - 1 downto 0) := std_logic_vector(to_unsigned(mem_words - 1, 32));
   type memory_t is array (0 to mem_words - 1) of manager_word_t;