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//////////////////////////////////////////////////////////////////////

////                                                              ////

////  Tubo 8051 cores SPI Interface Module                        ////

////                                                              ////

////  This file is part of the Turbo 8051 cores project           ////

////  http://www.opencores.org/cores/turbo8051/                   ////

////                                                              ////

////  Description                                                 ////

////  Turbo 8051 definitions.                                     ////

////                                                              ////

////  To Do:                                                      ////

////    nothing                                                   ////

////                                                              ////

////  Author(s):                                                  ////

////      - Dinesh Annayya, dinesha@opencores.org                 ////

////                                                              ////

////  Revision : Mar 2, 2011                                      //// 

////                                                              ////

//////////////////////////////////////////////////////////////////////

////                                                              ////

//// Copyright (C) 2000 Authors and OPENCORES.ORG                 ////

////                                                              ////

//// This source file may be used and distributed without         ////

//// restriction provided that this copyright statement is not    ////

//// removed from the file and that any derivative work contains  ////

//// the original copyright notice and the associated disclaimer. ////

////                                                              ////

//// This source file is free software; you can redistribute it   ////

//// and/or modify it under the terms of the GNU Lesser General   ////

//// Public License as published by the Free Software Foundation; ////

//// either version 2.1 of the License, or (at your option) any   ////

//// later version.                                               ////

////                                                              ////

//// This source is distributed in the hope that it will be       ////

//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////

//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////

//// PURPOSE.  See the GNU Lesser General Public License for more ////

//// details.                                                     ////

////                                                              ////

//// You should have received a copy of the GNU Lesser General    ////

//// Public License along with this source; if not, download it   ////

//// from http://www.opencores.org/lgpl.shtml                     ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

module spi_cfg (

             mclk,

             reset_n,

        // Reg Bus Interface Signal

             reg_cs,

             reg_wr,

             reg_addr,

             reg_wdata,

             reg_be,

            // Outputs

            reg_rdata,

            reg_ack,

           // configuration signal

           cfg_tgt_sel        ,

           cfg_op_req         , // SPI operation request

           cfg_op_type        , // SPI operation type

           cfg_transfer_size  , // SPI transfer size

           cfg_sck_period     , // sck clock period

           cfg_sck_cs_period  , // cs setup/hold period

           cfg_cs_byte        , // cs bit information

           cfg_datain         , // data for transfer

           cfg_dataout        , // data for received

           hware_op_done      // operation done

        );

input         mclk;

input         reset_n;

output [1:0]  cfg_tgt_sel        ;

output        cfg_op_req         ; // SPI operation request

output [1:0]  cfg_op_type        ; // SPI operation type

output [1:0]  cfg_transfer_size  ; // SPI transfer size

output [5:0]  cfg_sck_period     ; // sck clock period

output [4:0]  cfg_sck_cs_period  ; // cs setup/hold period

output [7:0]  cfg_cs_byte        ; // cs bit information

output [31:0] cfg_datain         ; // data for transfer

input  [31:0] cfg_dataout        ; // data for received

input         hware_op_done      ; // operation done

//---------------------------------

// Reg Bus Interface Signal

//---------------------------------

input             reg_cs         ;

input             reg_wr         ;

input [3:0]       reg_addr       ;

input [31:0]      reg_wdata      ;

input [3:0]       reg_be         ;

// Outputs

output [31:0]     reg_rdata      ;

output            reg_ack        ;

//-----------------------------------------------------------------------

// Internal Wire Declarations

//-----------------------------------------------------------------------

wire           sw_rd_en;

wire           sw_wr_en;

wire  [3:0]    sw_addr ; // addressing 16 registers

wire  [3:0]    wr_be   ;

reg   [31:0]  reg_rdata      ;

reg           reg_ack     ;

wire [31:0]    reg_0;  // Software_Reg_0

wire [31:0]    reg_1;  // Software-Reg_1

wire [31:0]    reg_2;  // Software-Reg_2

wire [31:0]    reg_3;  // Software-Reg_3

wire [31:0]    reg_4;  // Software-Reg_4

wire [31:0]    reg_5;  // Software-Reg_5

wire [31:0]    reg_6;  // Software-Reg_6

wire [31:0]    reg_7;  // Software-Reg_7

wire [31:0]    reg_8;  // Software-Reg_8

wire [31:0]    reg_9;  // Software-Reg_9

wire [31:0]    reg_10; // Software-Reg_10

wire [31:0]    reg_11; // Software-Reg_11

wire [31:0]    reg_12; // Software-Reg_12

wire [31:0]    reg_13; // Software-Reg_13

wire [31:0]    reg_14; // Software-Reg_14

wire [31:0]    reg_15; // Software-Reg_15

reg  [31:0]    reg_out;

//-----------------------------------------------------------------------

// Main code starts here

//-----------------------------------------------------------------------

//-----------------------------------------------------------------------

// Internal Logic Starts here

//-----------------------------------------------------------------------

    assign sw_addr       = reg_addr [3:0];

    assign sw_rd_en      = reg_cs & !reg_wr;

    assign sw_wr_en      = reg_cs & reg_wr;

    assign wr_be         = reg_be;

//-----------------------------------------------------------------------

// Read path mux

//-----------------------------------------------------------------------

always @ (posedge mclk or negedge reset_n)

begin : preg_out_Seq

   if (reset_n == 1'b0)

   begin

      reg_rdata [31:0]  <= 32'h0000_0000;

      reg_ack           <= 1'b0;

   end

   else if (sw_rd_en && !reg_ack)

   begin

      reg_rdata [31:0]  <= reg_out [31:0];

      reg_ack           <= 1'b1;

   end

   else if (sw_wr_en && !reg_ack)

      reg_ack           <= 1'b1;

   else

   begin

      reg_ack        <= 1'b0;

   end

end

//-----------------------------------------------------------------------

// register read enable and write enable decoding logic

//-----------------------------------------------------------------------

wire   sw_wr_en_0 = sw_wr_en & (sw_addr == 4'h0);

wire   sw_rd_en_0 = sw_rd_en & (sw_addr == 4'h0);

wire   sw_wr_en_1 = sw_wr_en & (sw_addr == 4'h1);

wire   sw_rd_en_1 = sw_rd_en & (sw_addr == 4'h1);

wire   sw_wr_en_2 = sw_wr_en & (sw_addr == 4'h2);

wire   sw_rd_en_2 = sw_rd_en & (sw_addr == 4'h2);

wire   sw_wr_en_3 = sw_wr_en & (sw_addr == 4'h3);

wire   sw_rd_en_3 = sw_rd_en & (sw_addr == 4'h3);

wire   sw_wr_en_4 = sw_wr_en & (sw_addr == 4'h4);

wire   sw_rd_en_4 = sw_rd_en & (sw_addr == 4'h4);

wire   sw_wr_en_5 = sw_wr_en & (sw_addr == 4'h5);

wire   sw_rd_en_5 = sw_rd_en & (sw_addr == 4'h5);

wire   sw_wr_en_6 = sw_wr_en & (sw_addr == 4'h6);

wire   sw_rd_en_6 = sw_rd_en & (sw_addr == 4'h6);

wire   sw_wr_en_7 = sw_wr_en & (sw_addr == 4'h7);

wire   sw_rd_en_7 = sw_rd_en & (sw_addr == 4'h7);

wire   sw_wr_en_8 = sw_wr_en & (sw_addr == 4'h8);

wire   sw_rd_en_8 = sw_rd_en & (sw_addr == 4'h8);

wire   sw_wr_en_9 = sw_wr_en & (sw_addr == 4'h9);

wire   sw_rd_en_9 = sw_rd_en & (sw_addr == 4'h9);

wire   sw_wr_en_10 = sw_wr_en & (sw_addr == 4'hA);

wire   sw_rd_en_10 = sw_rd_en & (sw_addr == 4'hA);

wire   sw_wr_en_11 = sw_wr_en & (sw_addr == 4'hB);

wire   sw_rd_en_11 = sw_rd_en & (sw_addr == 4'hB);

wire   sw_wr_en_12 = sw_wr_en & (sw_addr == 4'hC);

wire   sw_rd_en_12 = sw_rd_en & (sw_addr == 4'hC);

wire   sw_wr_en_13 = sw_wr_en & (sw_addr == 4'hD);

wire   sw_rd_en_13 = sw_rd_en & (sw_addr == 4'hD);

wire   sw_wr_en_14 = sw_wr_en & (sw_addr == 4'hE);

wire   sw_rd_en_14 = sw_rd_en & (sw_addr == 4'hE);

wire   sw_wr_en_15 = sw_wr_en & (sw_addr == 4'hF);

wire   sw_rd_en_15 = sw_rd_en & (sw_addr == 4'hF);

always @( *)

begin : preg_sel_Com

  reg_out [31:0] = 32'd0;

  case (sw_addr [3:0])

    4'b0000 : reg_out [31:0] = reg_0 [31:0];

    4'b0001 : reg_out [31:0] = reg_1 [31:0];

    4'b0010 : reg_out [31:0] = reg_2 [31:0];

    4'b0011 : reg_out [31:0] = reg_3 [31:0];

    4'b0100 : reg_out [31:0] = reg_4 [31:0];

    4'b0101 : reg_out [31:0] = reg_5 [31:0];

    4'b0110 : reg_out [31:0] = reg_6 [31:0];

    4'b0111 : reg_out [31:0] = reg_7 [31:0];

    4'b1000 : reg_out [31:0] = reg_8 [31:0];

    4'b1001 : reg_out [31:0] = reg_9 [31:0];

    4'b1010 : reg_out [31:0] = reg_10 [31:0];

    4'b1011 : reg_out [31:0] = reg_11 [31:0];

    4'b1100 : reg_out [31:0] = reg_12 [31:0];

    4'b1101 : reg_out [31:0] = reg_13 [31:0];

    4'b1110 : reg_out [31:0] = reg_14 [31:0];

    4'b1111 : reg_out [31:0] = reg_15 [31:0];

  endcase

end

//-----------------------------------------------------------------------

// Individual register assignments

//-----------------------------------------------------------------------

// Logic for Register 0 : SPI Control Register

//-----------------------------------------------------------------------

wire         cfg_op_req         = reg_0[31];    // cpu request

wire [1:0]   cfg_tgt_sel        = reg_0[24:23]; // target chip select

wire [1:0]   cfg_op_type        = reg_0[22:21]; // SPI operation type

wire [1:0]   cfg_transfer_size  = reg_0[20:19]; // SPI transfer size

wire [5:0]   cfg_sck_period     = reg_0[18:13]; // sck clock period

wire [4:0]   cfg_sck_cs_period  = reg_0[12:8];  // cs setup/hold period

wire [7:0]   cfg_cs_byte        = reg_0[7:0];   // cs bit information

generic_register #(8,0  ) u_spi_ctrl_be0 (

              .we            ({8{sw_wr_en_0 &

                                 wr_be[0]   }}  ),

              .data_in       (reg_wdata[7:0]    ),

              .reset_n       (reset_n           ),

              .clk           (mclk              ),

              //List of Outs

              .data_out      (reg_0[7:0]        )

          );

generic_register #(8,0  ) u_spi_ctrl_be1 (

              .we            ({8{sw_wr_en_0 &

                                wr_be[1]   }}  ),

              .data_in       (reg_wdata[15:8]  ),

              .reset_n       (reset_n           ),

              .clk           (mclk              ),

              //List of Outs

              .data_out      (reg_0[15:8]       )

          );

generic_register #(8,0  ) u_spi_ctrl_be2 (

              .we            ({8{sw_wr_en_0 &

                                wr_be[2]   }}  ),

              .data_in       (reg_wdata[23:16] ),

              .reset_n       (reset_n           ),

              .clk           (mclk              ),

              //List of Outs

              .data_out      (reg_0[23:16]       )

          );

assign reg_0[30:24] = 7'h0;

req_register #(0  ) u_spi_ctrl_req (

              .cpu_we       ({sw_wr_en_0 &

                             wr_be[3]   }       ),

              .cpu_req      (reg_wdata[31]      ),

              .hware_ack    (hware_op_done      ),

              .reset_n       (reset_n           ),

              .clk           (mclk              ),

              //List of Outs

              .data_out      (reg_0[31]         )

          );

//-----------------------------------------------------------------------

// Logic for Register 1 : SPI Data In Register

//-----------------------------------------------------------------------

wire [31:0]   cfg_datain        = reg_1[31:0];

generic_register #(8,0  ) u_spi_din_be0 (

              .we            ({8{sw_wr_en_1 &

                                wr_be[0]   }}  ),

              .data_in       (reg_wdata[7:0]    ),

              .reset_n       (reset_n           ),

              .clk           (mclk              ),

              //List of Outs

              .data_out      (reg_1[7:0]        )

          );

generic_register #(8,0  ) u_spi_din_be1 (

              .we            ({8{sw_wr_en_1 &

                                wr_be[1]   }}  ),

              .data_in       (reg_wdata[15:8]   ),

              .reset_n       (reset_n           ),

              .clk           (mclk              ),

              //List of Outs

              .data_out      (reg_1[15:8]       )

          );

generic_register #(8,0  ) u_spi_din_be2 (

              .we            ({8{sw_wr_en_1 &

                                wr_be[2]   }}  ),

              .data_in       (reg_wdata[23:16]  ),

              .reset_n       (reset_n           ),

              .clk           (mclk              ),

              //List of Outs

              .data_out      (reg_1[23:16]      )

          );

generic_register #(8,0  ) u_spi_din_be3 (

              .we            ({8{sw_wr_en_1 &

                                wr_be[3]   }}  ),

              .data_in       (reg_wdata[31:24]  ),

              .reset_n       (reset_n           ),

              .clk           (mclk              ),

              //List of Outs

              .data_out      (reg_1[31:24]      )

          );

//-----------------------------------------------------------------------

// Logic for Register 2 : SPI Data output Register

//-----------------------------------------------------------------------

assign  reg_2 = cfg_dataout;

endmodule