first_nios2_system.v

nios下的lcd驱动开发源代码（仅供参考）

    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    1'b0,
    button_pio_s1_irq_from_sa,
    system_timer_s1_irq_from_sa,
    jtag_uart_avalon_jtag_slave_irq_from_sa};

  //no_byte_enables_and_last_term, which is an e_register
  always @(posedge clk or negedge reset_n)
    begin
      if (reset_n == 0)
          cpu_data_master_no_byte_enables_and_last_term <= 0;
      else if (1)
          cpu_data_master_no_byte_enables_and_last_term <= last_dbs_term_and_run;
    end


  //compute the last dbs term, which is an e_mux
  assign last_dbs_term_and_run = (cpu_data_master_dbs_address == 2'b11) & cpu_data_master_write & !cpu_data_master_byteenable_ext_flash_s1;

  //pre dbs count enable, which is an e_mux
  assign pre_dbs_count_enable = (((~cpu_data_master_no_byte_enables_and_last_term) & cpu_data_master_requests_ext_flash_s1 & cpu_data_master_write & !cpu_data_master_byteenable_ext_flash_s1)) |
    cpu_data_master_read_data_valid_ext_flash_s1 |
    ((cpu_data_master_granted_ext_flash_s1 & cpu_data_master_write & 1 & ({ext_flash_s1_wait_counter_eq_0 & ~d1_ext_ram_bus_avalon_slave_end_xfer})));

  //input to dbs-8 stored 0, which is an e_mux
  assign p1_dbs_8_reg_segment_0 = incoming_ext_ram_bus_data_with_Xs_converted_to_0;

  //dbs register for dbs-8 segment 0, which is an e_register
  always @(posedge clk or negedge reset_n)
    begin
      if (reset_n == 0)
          dbs_8_reg_segment_0 <= 0;
      else if (dbs_count_enable & ((cpu_data_master_dbs_address[1 : 0]) == 0))
          dbs_8_reg_segment_0 <= p1_dbs_8_reg_segment_0;
    end


  //input to dbs-8 stored 1, which is an e_mux
  assign p1_dbs_8_reg_segment_1 = incoming_ext_ram_bus_data_with_Xs_converted_to_0;

  //dbs register for dbs-8 segment 1, which is an e_register
  always @(posedge clk or negedge reset_n)
    begin
      if (reset_n == 0)
          dbs_8_reg_segment_1 <= 0;
      else if (dbs_count_enable & ((cpu_data_master_dbs_address[1 : 0]) == 1))
          dbs_8_reg_segment_1 <= p1_dbs_8_reg_segment_1;
    end


  //input to dbs-8 stored 2, which is an e_mux
  assign p1_dbs_8_reg_segment_2 = incoming_ext_ram_bus_data_with_Xs_converted_to_0;

  //dbs register for dbs-8 segment 2, which is an e_register
  always @(posedge clk or negedge reset_n)
    begin
      if (reset_n == 0)
          dbs_8_reg_segment_2 <= 0;
      else if (dbs_count_enable & ((cpu_data_master_dbs_address[1 : 0]) == 2))
          dbs_8_reg_segment_2 <= p1_dbs_8_reg_segment_2;
    end


  //mux write dbs 2, which is an e_mux
  assign cpu_data_master_dbs_write_8 = ((cpu_data_master_dbs_address[1 : 0] == 0))? cpu_data_master_writedata[7 : 0] :
    ((cpu_data_master_dbs_address[1 : 0] == 1))? cpu_data_master_writedata[15 : 8] :
    ((cpu_data_master_dbs_address[1 : 0] == 2))? cpu_data_master_writedata[23 : 16] :
    cpu_data_master_writedata[31 : 24];

  //dbs count increment, which is an e_mux
  assign cpu_data_master_dbs_increment = (cpu_data_master_requests_ext_flash_s1)? 1 :
    0;

  //dbs counter overflow, which is an e_assign
  assign dbs_counter_overflow = cpu_data_master_dbs_address[1] & !(next_dbs_address[1]);

  //next master address, which is an e_assign
  assign next_dbs_address = cpu_data_master_dbs_address + cpu_data_master_dbs_increment;

  //dbs count enable, which is an e_mux
  assign dbs_count_enable = pre_dbs_count_enable;

  //dbs counter, which is an e_register
  always @(posedge clk or negedge reset_n)
    begin
      if (reset_n == 0)
          cpu_data_master_dbs_address <= 0;
      else if (dbs_count_enable)
          cpu_data_master_dbs_address <= next_dbs_address;
    end


  //unpredictable registered wait state incoming data, which is an e_register
  always @(posedge clk or negedge reset_n)
    begin
      if (reset_n == 0)
          registered_cpu_data_master_readdata <= 0;
      else if (1)
          registered_cpu_data_master_readdata <= p1_registered_cpu_data_master_readdata;
    end


  //registered readdata mux, which is an e_mux
  assign p1_registered_cpu_data_master_readdata = {32 {~cpu_data_master_requests_jtag_uart_avalon_jtag_slave}} | jtag_uart_avalon_jtag_slave_readdata_from_sa;


  // synthesis attribute cpu_data_master_arbitrator auto_dissolve FALSE

endmodule


module cpu_instruction_master_arbitrator (
                                           // inputs:
                                            clk,
                                            cpu_instruction_master_address,
                                            cpu_instruction_master_granted_cpu_jtag_debug_module,
                                            cpu_instruction_master_granted_ext_flash_s1,
                                            cpu_instruction_master_granted_ext_ram_s1,
                                            cpu_instruction_master_qualified_request_cpu_jtag_debug_module,
                                            cpu_instruction_master_qualified_request_ext_flash_s1,
                                            cpu_instruction_master_qualified_request_ext_ram_s1,
                                            cpu_instruction_master_read,
                                            cpu_instruction_master_read_data_valid_cpu_jtag_debug_module,
                                            cpu_instruction_master_read_data_valid_ext_flash_s1,
                                            cpu_instruction_master_read_data_valid_ext_ram_s1,
                                            cpu_instruction_master_requests_cpu_jtag_debug_module,
                                            cpu_instruction_master_requests_ext_flash_s1,
                                            cpu_instruction_master_requests_ext_ram_s1,
                                            cpu_jtag_debug_module_readdata_from_sa,
                                            d1_cpu_jtag_debug_module_end_xfer,
                                            d1_ext_ram_bus_avalon_slave_end_xfer,
                                            ext_flash_s1_wait_counter_eq_0,
                                            incoming_ext_ram_bus_data,
                                            reset_n,

                                           // outputs:
                                            cpu_instruction_master_address_to_slave,
                                            cpu_instruction_master_dbs_address,
                                            cpu_instruction_master_latency_counter,
                                            cpu_instruction_master_readdata,
                                            cpu_instruction_master_readdatavalid,
                                            cpu_instruction_master_waitrequest
                                         );

  output  [ 23: 0] cpu_instruction_master_address_to_slave;
  output  [  1: 0] cpu_instruction_master_dbs_address;
  output  [  1: 0] cpu_instruction_master_latency_counter;
  output  [ 31: 0] cpu_instruction_master_readdata;
  output           cpu_instruction_master_readdatavalid;
  output           cpu_instruction_master_waitrequest;
  input            clk;
  input   [ 23: 0] cpu_instruction_master_address;
  input            cpu_instruction_master_granted_cpu_jtag_debug_module;
  input            cpu_instruction_master_granted_ext_flash_s1;
  input            cpu_instruction_master_granted_ext_ram_s1;
  input            cpu_instruction_master_qualified_request_cpu_jtag_debug_module;
  input            cpu_instruction_master_qualified_request_ext_flash_s1;
  input            cpu_instruction_master_qualified_request_ext_ram_s1;
  input            cpu_instruction_master_read;
  input            cpu_instruction_master_read_data_valid_cpu_jtag_debug_module;
  input            cpu_instruction_master_read_data_valid_ext_flash_s1;
  input            cpu_instruction_master_read_data_valid_ext_ram_s1;
  input            cpu_instruction_master_requests_cpu_jtag_debug_module;
  input            cpu_instruction_master_requests_ext_flash_s1;
  input            cpu_instruction_master_requests_ext_ram_s1;
  input   [ 31: 0] cpu_jtag_debug_module_readdata_from_sa;
  input            d1_cpu_jtag_debug_module_end_xfer;
  input            d1_ext_ram_bus_avalon_slave_end_xfer;
  input            ext_flash_s1_wait_counter_eq_0;
  input   [ 31: 0] incoming_ext_ram_bus_data;
  input            reset_n;

  reg              active_and_waiting_last_time;
  reg     [ 23: 0] cpu_instruction_master_address_last_time;
  wire    [ 23: 0] cpu_instruction_master_address_to_slave;
  reg     [  1: 0] cpu_instruction_master_dbs_address;
  wire    [  1: 0] cpu_instruction_master_dbs_increment;
  reg     [  1: 0] cpu_instruction_master_dbs_rdv_counter;
  wire    [  1: 0] cpu_instruction_master_dbs_rdv_counter_inc;
  wire             cpu_instruction_master_is_granted_some_slave;
  reg     [  1: 0] cpu_instruction_master_latency_counter;
  wire    [  1: 0] cpu_instruction_master_next_dbs_rdv_counter;
  reg              cpu_instruction_master_read_but_no_slave_selected;
  reg              cpu_instruction_master_read_last_time;
  wire    [ 31: 0] cpu_instruction_master_readdata;
  wire             cpu_instruction_master_readdatavalid;
  wire             cpu_instruction_master_waitrequest;
  wire             dbs_count_enable;
  wire             dbs_counter_overflow;
  reg     [  7: 0] dbs_latent_8_reg_segment_0;
  reg     [  7: 0] dbs_latent_8_reg_segment_1;
  reg     [  7: 0] dbs_latent_8_reg_segment_2;
  wire             dbs_rdv_count_enable;
  wire             dbs_rdv_counter_overflow;
  wire             dummy_sink;
  wire    [  1: 0] latency_load_value;
  wire    [  1: 0] ne