Max1000 Remote System Upgrade via SPI

Yes, I am using the Platform Designer. I put the onchip-flash, onchip-memory and dual_boot in a Qsys file and added it to the project. I link the signals externally. I'll add a scrrenshot of it.

I would like to implement the RSU not with the Nios, but with an own logic circuit. So that I write the VHDL code myself to read and write the register and read from the flash or write on the flash. I could already read the register and got the expected data. It should not really change my problem if the Nios or something else is connected, because it does not increase the size of the addresbus from the onchip flash.

This is how a part of my interface to the onchip flash should look like then. I read the register, then I write in the register the command to clear a page and wait until the bit in the register is set that the clear was successful. But no matter how that looks, it shouldn't change my problem.

   -- -------------------------------------------------------------------------------------
    --  erase Page or sector
    -- -------------------------------------------------------------------------------------	 
	 procedure register_erase (
    i_data_register       : in  std_logic_vector(31 downto 0)) is
    begin
	     CASE operation_register IS
		  
	     -- 1. read in which mode flash is
        -- 2. write erase command in register 0x01
	     -- 3. Check register 0x00 wheather erase was sucessful
		  -- 4. reset register 0x01 
		  WHEN mode_start =>
		      onchip_flash_register_addr <= '0';
		      onchip_flash_register_read <= '1';
				IF count_flash <= 5 THEN
				    count_flash <= count_flash + 1;
				ELSE
				    IF onchip_flash_register_readdata (1 DOWNTO 0) = "00" THEN
				        -- Flash is in IDLE mode
						  operation_register <= mode_write;
						  count_flash <= 0;
				    ELSE
					     -- Flash is busy
						  count_flash <= 0;
						  count_error_flash <= count_error_flash + 1;
					 END IF;
				END IF;
				
		  WHEN mode_write =>
		      onchip_flash_register_read <= '0';
				onchip_flash_register_addr <= '1';
		      onchip_flash_register_write <= '1';
				onchip_flash_register_writedata <= i_data_register;
				-- wait a few ns to write in register
				IF count_flash <= 10 THEN
				    count_flash <= count_flash + 1;
				ELSE
				    count_flash <= 0;
				    operation_register <= mode_check;
				END IF;
				
		  WHEN mode_check =>
		      onchip_flash_register_read <= '1';
				onchip_flash_register_addr <= '0';
		      onchip_flash_register_write <= '0';
				-- wait a few ns to read from register
				IF count_flash <= 10 THEN
				    count_flash <= count_flash + 1;
				ELSE
				    IF onchip_flash_register_readdata (4 DOWNTO 4) = "1" THEN
				        -- erase was sucessful
						  count_flash <= 0;
						  count_error_flash <= 0;
				        operation_register <= mode_reset;
					 ELSE
					     -- erase wasnt sucessful
						  count_flash <= 0;
						  count_error_flash <= count_error_flash + 1;
						  operation_register <= mode_write;
					 END IF;
				END IF;
		  
		  WHEN mode_reset =>
		      onchip_flash_register_read <= '0';
				onchip_flash_register_addr <= '1';
		      onchip_flash_register_write <= '1';
				onchip_flash_register_writedata <= x"FF800000";
				-- wait a few ns to write in register
				IF count_flash <= 5 THEN
				    count_flash <= count_flash + 1;
				ELSE
				    count_flash <= 0;
				    operation_register <= mode_start;
					 operation_flash <= mode_wait;
					 onchip_flash_register_addr <= '0';
		          onchip_flash_register_write <= '0';
				END IF;
		  
		  WHEN OTHERS =>
		      operation_register <= mode_start;
		  
		  END CASE;
	 
    end register_erase;