source: firmware/FAD/FACT_FAD_TB_lib/hdl/w5300_interface_tester_beha.vhd@ 17942

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.NUMERIC_STD.ALL;
USE ieee.std_logic_unsigned.all;

ENTITY w5300_interface_tester IS
   PORT( 
                clk    : IN     std_logic;


      -- interface to W5300 chip ports:
          cs        : IN     std_logic;
          rd        : IN     std_logic;
          wiz_addr  : IN     std_logic_vector (9 DOWNTO 0);
          wiz_data  : INOUT  std_logic_vector (15 DOWNTO 0);
          wiz_reset : IN     std_logic;
          wr        : IN     std_logic;
          int       : OUT    std_logic;
      
      
      data_o    : IN     std_logic_vector (15 DOWNTO 0);
      addr_i    : OUT    std_logic_vector (9 DOWNTO 0);
      data_i    : OUT    std_logic_vector (15 DOWNTO 0);
      read_i    : OUT    std_logic;
      ready_o                   : IN                    std_logic;
      write_i   : OUT    std_logic

   );

-- Declarations

END w5300_interface_tester ;

--
ARCHITECTURE beha OF w5300_interface_tester IS
        type state_t is (
        PRESTART,
        WRITE_TEST, WRITING,
        READ_TEST, READING
        --FINAL
        );

        signal state : state_t;
        
        signal write : std_logic;
        signal read : std_logic;
        
BEGIN

        write_i <= write;
        read_i <= read;
        wiz_data <= X"1234";
        
        process(clk)
                begin
                        
                        if rising_edge(clk) then
                                case state is
                                when    PRESTART =>
                                        read <= '0';
                                        write <= '0';
                                        if (ready_o = '1') then
                                                state <= WRITE_TEST;
                                        end if;
                                
                                when WRITE_TEST =>
                                        if (ready_o = '1') then
                                                addr_i <= "0000111100";
                                                data_i <= X"ABCD";
                                                write <= '1';
                                                state <= WRITING;
                                        end if;                                 

                                when WRITING =>
                                        if (ready_o = '0') then
                                                write <= '0';
                                                state <= READ_TEST;
                                        end if;
                                        
                                when READ_TEST =>
                                        if (ready_o = '1') then
                                                addr_i <= "0100110101";
                                                read <= '1';
                                                state <= READING;
                                        end if;                                 
                                        
                                when READING =>
                                        if (ready_o = '0') then
                                                read <= '0';
                                                state <= WRITE_TEST;
                                end if;
        

                                
        
                                end case;
                                
                        end if; --clk
                        
                end process;
        
END ARCHITECTURE beha;