std_2c35.v

这个是基于NIOS II的FPGA平台的一个CF卡的接口模块

  assign cpu_jtag_debug_module_chosen_master_double_vector = {cpu_jtag_debug_module_master_qreq_vector, cpu_jtag_debug_module_master_qreq_vector} & ({~cpu_jtag_debug_module_master_qreq_vector, ~cpu_jtag_debug_module_master_qreq_vector} + cpu_jtag_debug_module_arb_addend);

  //stable onehot encoding of arb winner
  assign cpu_jtag_debug_module_arb_winner = (cpu_jtag_debug_module_allow_new_arb_cycle & | cpu_jtag_debug_module_grant_vector) ? cpu_jtag_debug_module_grant_vector : cpu_jtag_debug_module_saved_chosen_master_vector;

  //saved cpu_jtag_debug_module_grant_vector, which is an e_register
  always @(posedge clk or negedge reset_n)
    begin
      if (reset_n == 0)
          cpu_jtag_debug_module_saved_chosen_master_vector <= 0;
      else if (cpu_jtag_debug_module_allow_new_arb_cycle)
          cpu_jtag_debug_module_saved_chosen_master_vector <= |cpu_jtag_debug_module_grant_vector ? cpu_jtag_debug_module_grant_vector : cpu_jtag_debug_module_saved_chosen_master_vector;
    end


  //onehot encoding of chosen master
  assign cpu_jtag_debug_module_grant_vector = {(cpu_jtag_debug_module_chosen_master_double_vector[1] | cpu_jtag_debug_module_chosen_master_double_vector[3]),
    (cpu_jtag_debug_module_chosen_master_double_vector[0] | cpu_jtag_debug_module_chosen_master_double_vector[2])};

  //cpu/jtag_debug_module chosen master rotated left, which is an e_assign
  assign cpu_jtag_debug_module_chosen_master_rot_left = (cpu_jtag_debug_module_arb_winner << 1) ? (cpu_jtag_debug_module_arb_winner << 1) : 1;

  //cpu/jtag_debug_module's addend for next-master-grant
  always @(posedge clk or negedge reset_n)
    begin
      if (reset_n == 0)
          cpu_jtag_debug_module_arb_addend <= 1;
      else if (|cpu_jtag_debug_module_grant_vector)
          cpu_jtag_debug_module_arb_addend <= cpu_jtag_debug_module_end_xfer? cpu_jtag_debug_module_chosen_master_rot_left : cpu_jtag_debug_module_grant_vector;
    end


  assign cpu_jtag_debug_module_begintransfer = cpu_jtag_debug_module_begins_xfer;
  //assign lhs ~cpu_jtag_debug_module_reset of type reset_n to cpu_jtag_debug_module_reset_n, which is an e_assign
  assign cpu_jtag_debug_module_reset = ~cpu_jtag_debug_module_reset_n;

  //cpu_jtag_debug_module_reset_n assignment, which is an e_assign
  assign cpu_jtag_debug_module_reset_n = reset_n;

  //assign cpu_jtag_debug_module_resetrequest_from_sa = cpu_jtag_debug_module_resetrequest so that symbol knows where to group signals which may go to master only, which is an e_assign
  assign cpu_jtag_debug_module_resetrequest_from_sa = cpu_jtag_debug_module_resetrequest;

  assign cpu_jtag_debug_module_chipselect = cpu_data_master_granted_cpu_jtag_debug_module | cpu_instruction_master_granted_cpu_jtag_debug_module;
  //cpu_jtag_debug_module_firsttransfer first transaction, which is an e_assign
  assign cpu_jtag_debug_module_firsttransfer = ~(cpu_jtag_debug_module_slavearbiterlockenable & cpu_jtag_debug_module_any_continuerequest);

  //cpu_jtag_debug_module_beginbursttransfer_internal begin burst transfer, which is an e_assign
  assign cpu_jtag_debug_module_beginbursttransfer_internal = cpu_jtag_debug_module_begins_xfer & cpu_jtag_debug_module_firsttransfer;

  //cpu_jtag_debug_module_arbitration_holdoff_internal arbitration_holdoff, which is an e_assign
  assign cpu_jtag_debug_module_arbitration_holdoff_internal = cpu_jtag_debug_module_begins_xfer & cpu_jtag_debug_module_firsttransfer;

  //cpu_jtag_debug_module_write assignment, which is an e_mux
  assign cpu_jtag_debug_module_write = cpu_data_master_granted_cpu_jtag_debug_module & cpu_data_master_write;

  //cpu_jtag_debug_module_address mux, which is an e_mux
  assign cpu_jtag_debug_module_address = (cpu_data_master_granted_cpu_jtag_debug_module)? (cpu_data_master_address_to_slave >> 2) :
    (cpu_instruction_master_address_to_slave >> 2);

  //d1_cpu_jtag_debug_module_end_xfer register, which is an e_register
  always @(posedge clk or negedge reset_n)
    begin
      if (reset_n == 0)
          d1_cpu_jtag_debug_module_end_xfer <= 1;
      else if (1)
          d1_cpu_jtag_debug_module_end_xfer <= cpu_jtag_debug_module_end_xfer;
    end


  //cpu_jtag_debug_module_waits_for_read in a cycle, which is an e_mux
  assign cpu_jtag_debug_module_waits_for_read = cpu_jtag_debug_module_in_a_read_cycle & cpu_jtag_debug_module_begins_xfer;

  //cpu_jtag_debug_module_in_a_read_cycle assignment, which is an e_assign
  assign cpu_jtag_debug_module_in_a_read_cycle = (cpu_data_master_granted_cpu_jtag_debug_module & cpu_data_master_read) | (cpu_instruction_master_granted_cpu_jtag_debug_module & cpu_instruction_master_read);

  //in_a_read_cycle assignment, which is an e_mux
  assign in_a_read_cycle = cpu_jtag_debug_module_in_a_read_cycle;

  //cpu_jtag_debug_module_waits_for_write in a cycle, which is an e_mux
  assign cpu_jtag_debug_module_waits_for_write = cpu_jtag_debug_module_in_a_write_cycle & cpu_jtag_debug_module_begins_xfer;

  //cpu_jtag_debug_module_in_a_write_cycle assignment, which is an e_assign
  assign cpu_jtag_debug_module_in_a_write_cycle = cpu_data_master_granted_cpu_jtag_debug_module & cpu_data_master_write;

  //in_a_write_cycle assignment, which is an e_mux
  assign in_a_write_cycle = cpu_jtag_debug_module_in_a_write_cycle;

  assign wait_for_cpu_jtag_debug_module_counter = 0;
  //cpu_jtag_debug_module_byteenable byte enable port mux, which is an e_mux
  assign cpu_jtag_debug_module_byteenable = (cpu_data_master_granted_cpu_jtag_debug_module)? cpu_data_master_byteenable :
    -1;


//synthesis translate_off
//////////////// SIMULATION-ONLY CONTENTS
  //grant signals are active simultaneously, which is an e_process
  always @(posedge clk)
    begin
      if (cpu_data_master_granted_cpu_jtag_debug_module + cpu_instruction_master_granted_cpu_jtag_debug_module > 1)
        begin
          $write("%0d ns: > 1 of grant signals are active simultaneously", $time);
          $stop;
        end
    end


  //saved_grant signals are active simultaneously, which is an e_process
  always @(posedge clk)
    begin
      if (cpu_data_master_saved_grant_cpu_jtag_debug_module + cpu_instruction_master_saved_grant_cpu_jtag_debug_module > 1)
        begin
          $write("%0d ns: > 1 of saved_grant signals are active simultaneously", $time);
          $stop;
        end
    end



//////////////// END SIMULATION-ONLY CONTENTS

//synthesis translate_on

  // synthesis attribute cpu_jtag_debug_module_arbitrator auto_dissolve FALSE

endmodule


module cpu_data_master_arbitrator (
                                    // inputs:
                                     button_pio_s1_irq_from_sa,
                                     button_pio_s1_readdata_from_sa,
                                     cf_ctl_irq_from_sa,
                                     cf_ctl_readdata_from_sa,
                                     cf_ctl_wait_counter_eq_0,
                                     cf_ctl_wait_counter_eq_1,
                                     cf_ide_irq_from_sa,
                                     cf_ide_readdata_from_sa,
                                     cf_ide_wait_counter_eq_0,
                                     cf_ide_wait_counter_eq_1,
                                     clk,
                                     cpu_data_master_address,
                                     cpu_data_master_byteenable_ext_flash_s1,
                                     cpu_data_master_debugaccess,
                                     cpu_data_master_granted_button_pio_s1,
                                     cpu_data_master_granted_cf_ctl,
                                     cpu_data_master_granted_cf_ide,
                                     cpu_data_master_granted_cpu_jtag_debug_module,
                                     cpu_data_master_granted_ddr_sdram_s1,
                                     cpu_data_master_granted_epcs_controller_epcs_control_port,
                                     cpu_data_master_granted_ext_flash_s1,
                                     cpu_data_master_granted_ext_ssram_s1,
                                     cpu_data_master_granted_high_res_timer_s1,
                                     cpu_data_master_granted_jtag_uart_avalon_jtag_slave,
                                     cpu_data_master_granted_lan91c111_s1,
                                     cpu_data_master_granted_led_pio_s1,
                                     cpu_data_master_granted_reconfig_request_pio_s1,
                                     cpu_data_master_granted_seven_seg_pio_s1,
                                     cpu_data_master_granted_sys_clk_timer_s1,
                                     cpu_data_master_granted_sysid_control_slave,
                                     cpu_data_master_granted_uart1_s1,
                                     cpu_data_master_qualified_request_button_pio_s1,
                                     cpu_data_master_qualified_request_cf_ctl,
                                     cpu_data_master_qualified_request_cf_ide,
                                     cpu_data_master_qualified_request_cpu_jtag_debug_module,
                                     cpu_data_master_qualified_request_ddr_sdram_s1,
                                     cpu_data_master_qualified_request_epcs_controller_epcs_control_port,
                                     cpu_data_master_qualified_request_ext_flash_s1,
                                     cpu_data_master_qualified_request_ext_ssram_s1,
                                     cpu_data_master_qualified_request_high_res_timer_s1,
                                     cpu_data_master_qualified_request_jtag_uart_avalon_jtag_slave,
                                     cpu_data_master_qualified_request_lan91c111_s1,
                                     cpu_data_master_qualified_request_led_pio_s1,
                                     cpu_data_master_qualified_request_reconfig_request_pio_s1,
                                     cpu_data_master_qualified_request_seven_seg_pio_s1,
                                     cpu_data_master_qualified_request_sys_clk_timer_s1,
                                     cpu_data_master_qualified_request_sysid_control_slave,
                                     cpu_data_master_qualified_request_uart1_s1,
                                     cpu_data_master_read,
                                     cpu_data_master_read_data_valid_button_pio_s1,
                                     cpu_data_master_read_data_valid_cf_ctl,
                                     cpu_data_master_read_data_valid_cf_ide,
                                     cpu_data_master_read_data_valid_cpu_jtag_debug_module,
                                     cpu_data_master_read_data_valid_ddr_sdram_s1,
                                     cpu_data_master_read_data_valid_ddr_sdram_s1_shift_register,
                                     cpu_data_master_read_data_valid_epcs_controller_epcs_control_port,
                                     cpu_data_master_read_data_valid_ext_flash_s1,
                                     cpu_data_master_read_data_valid_ext_ssram_s1,
                                     cpu_data_master_read_data_valid_high_res_timer_s1,
                                     cpu_data_master_read_data_valid_jtag_uart_avalon_jtag_slave,
                                     cpu_data_master_read_data_valid_lan91c111_s1,
                                     cpu_data_master_read_data_valid_led_pio_s1,
                                     cpu_data_master_read_data_valid_reconfig_request_pio_s1,
                                     cpu_data_master_read_data_valid_seven_seg_pio_s1,
                                     cpu_data_master_read_data_valid_sys_clk_timer_s1,
                                     cpu_data_master_read_data_valid_sysid_control_slave,
                                     cpu_data_master_read_data_valid_uart1_s1,
                                     cpu_data_master_requests_button_pio_s1,
                                     cpu_data_master_requests_cf_ctl,
                                     cpu_data_master_requests_cf_ide,
                                     cpu_data_master_requests_cpu_jtag_debug_module,
                                     cpu_data_master_requests_ddr_sdram_s1,
                                     cpu_data_master_requests_epcs_controller_epcs_control_port,
                                     cpu_data_master_requests_ext_flash_s1,
                                     cpu_data_master_requests_ext_ssram_s1,
                                     cpu_data_master_requests_high_res_timer_s1,
                                     cpu_data_master_requests_jtag_uart_avalon_jtag_slave,
                                     cpu_data_master_requests_lan91c111_s1,
                                     cpu_data_master_requests_led_pio_s1,
                                     cpu_data_master_requests_reconfig_request_pio_s1,
                                     cpu_data_master_requests_seven_seg_pio_s1,
                                     cpu_data_master_requests_sys_clk_timer_s1,
                                     cpu_data_master_requests_sysid_control_slave,
                                     cpu_data_master_requests_uart1_s1,
                                     cpu_data_master_write,
                                     cpu_data_master_writedata,
                                     cpu_jtag_debug_module_readdata_from_sa,
                                     d1_button_pio_s1_end_xfer,
                                     d1_cf_ctl_end_xfer,
                                     d1_cf_ide_end_xfer,
                                     d1_cpu_jtag_debug_module_end_xfer,
                                     d1_ddr_sdram_s1_end_xfer,
                                     d1_epcs_controller_epcs_control_port_end_xfer,
                                     d1_ext_flash_enet_bus_avalon_slave_end_xfer,
                                     d1_ext_ssram_bus_avalon_slave_end_xfer,
                                     d1_high_res_timer_s1_end_xfer,
                                     d1_irq_from_the_lan91c111,
                                     d1_jtag_uart_avalon_jtag_slave_end_xfer,
                                     d1_led_pio_s1_end_xfer,
                                     d1_reconfig_request_pio_s1_end_xfer,
                                     d1_seven_seg_pio_s1_end_xfer,
                                     d1_sys_clk_timer_s1_end_xfer,
                                     d1_sysid_control_slave_end_xfer,
                                     d1_uart1_s1_end_xfer,
                                     ddr_sdram_s1_posted_fifo_readenable,
                                     ddr_sdram_s1_posted_fifo_writenable,
                                     ddr_sdram_s1_readdata_from_sa,
                                     ddr_sdram_s1_waitrequest_n_from_sa,
                                     epcs_controller_epcs_control_port_irq_from_sa,
                                     epcs_controller_epcs_control_port_readdata_from_sa,
                                     ext_flash_s1_wait_counter_eq_0,
                                     ext_flash_s1_wait_counter_eq_1,
                                     high_res_timer_s1_irq_from_sa,
                                     high_res_timer_s1_readdata_from_sa,
                                     incoming_data_to_and_from_the_ext_ssram,
                                     incoming_ext_flash_enet_bus_data,
                                     incoming_ext_flash_enet_bus_data_with_Xs_converted_to_0,
                                     jtag_uart_avalon_jtag_slave_irq_from_sa,
                                     jtag_uart_avalon_jtag_slave_readdata_fro