added SPI

modules/wishbone/wb_spi/Manifest.py

+files = ["spi_clgen.v",
+ 				"spi_shift.v",
+				"spi_top.v" ];
+

modules/wishbone/wb_spi/spi_clgen.v

+//////////////////////////////////////////////////////////////////////
+////                                                              ////
+////  spi_clgen.v                                                 ////
+////                                                              ////
+////  This file is part of the SPI IP core project                ////
+////  http://www.opencores.org/projects/spi/                      ////
+////                                                              ////
+////  Author(s):                                                  ////
+////      - Simon Srot (simons@opencores.org)                     ////
+////                                                              ////
+////  All additional information is avaliable in the Readme.txt   ////
+////  file.                                                       ////
+////                                                              ////
+//////////////////////////////////////////////////////////////////////
+////                                                              ////
+//// Copyright (C) 2002 Authors                                   ////
+////                                                              ////
+//// 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                     ////
+////                                                              ////
+//////////////////////////////////////////////////////////////////////
+
+`include "spi_defines.v"
+`include "timescale.v"
+
+module spi_clgen (clk_in, rst, go, enable, last_clk, divider, clk_out, pos_edge, neg_edge); 
+
+  parameter Tp = 1;
+  
+  input                            clk_in;   // input clock (system clock)
+  input                            rst;      // reset
+  input                            enable;   // clock enable
+  input                            go;       // start transfer
+  input                            last_clk; // last clock
+  input     [`SPI_DIVIDER_LEN-1:0] divider;  // clock divider (output clock is divided by this value)
+  output                           clk_out;  // output clock
+  output                           pos_edge; // pulse marking positive edge of clk_out
+  output                           neg_edge; // pulse marking negative edge of clk_out
+                            
+  reg                              clk_out;
+  reg                              pos_edge;
+  reg                              neg_edge;
+                            
+  reg       [`SPI_DIVIDER_LEN-1:0] cnt;      // clock counter 
+  wire                             cnt_zero; // conter is equal to zero
+  wire                             cnt_one;  // conter is equal to one
+  
+  
+  assign cnt_zero = cnt == {`SPI_DIVIDER_LEN{1'b0}};
+  assign cnt_one  = cnt == {{`SPI_DIVIDER_LEN-1{1'b0}}, 1'b1};
+  
+  // Counter counts half period
+  always @(posedge clk_in or posedge rst)
+  begin
+    if(rst)
+      cnt <= #Tp {`SPI_DIVIDER_LEN{1'b1}};
+    else
+      begin
+        if(!enable || cnt_zero)
+          cnt <= #Tp divider;
+        else
+          cnt <= #Tp cnt - {{`SPI_DIVIDER_LEN-1{1'b0}}, 1'b1};
+      end
+  end
+  
+  // clk_out is asserted every other half period
+  always @(posedge clk_in or posedge rst)
+  begin
+    if(rst)
+      clk_out <= #Tp 1'b0;
+    else
+      clk_out <= #Tp (enable && cnt_zero && (!last_clk || clk_out)) ? ~clk_out : clk_out;
+  end
+   
+  // Pos and neg edge signals
+  always @(posedge clk_in or posedge rst)
+  begin
+    if(rst)
+      begin
+        pos_edge  <= #Tp 1'b0;
+        neg_edge  <= #Tp 1'b0;
+      end
+    else
+      begin
+        pos_edge  <= #Tp (enable && !clk_out && cnt_one) || (!(|divider) && clk_out) || (!(|divider) && go && !enable);
+        neg_edge  <= #Tp (enable && clk_out && cnt_one) || (!(|divider) && !clk_out && enable);
+      end
+  end
+endmodule
+ 

modules/wishbone/wb_spi/spi_defines.v

+//////////////////////////////////////////////////////////////////////
+////                                                              ////
+////  spi_define.v                                                ////
+////                                                              ////
+////  This file is part of the SPI IP core project                ////
+////  http://www.opencores.org/projects/spi/                      ////
+////                                                              ////
+////  Author(s):                                                  ////
+////      - Simon Srot (simons@opencores.org)                     ////
+////                                                              ////
+////  All additional information is avaliable in the Readme.txt   ////
+////  file.                                                       ////
+////                                                              ////
+//////////////////////////////////////////////////////////////////////
+////                                                              ////
+//// Copyright (C) 2002 Authors                                   ////
+////                                                              ////
+//// 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                     ////
+////                                                              ////
+//////////////////////////////////////////////////////////////////////
+
+//
+// Number of bits used for devider register. If used in system with
+// low frequency of system clock this can be reduced.
+// Use SPI_DIVIDER_LEN for fine tuning theexact number.
+//
+//`define SPI_DIVIDER_LEN_8
+`define SPI_DIVIDER_LEN_16
+//`define SPI_DIVIDER_LEN_24
+//`define SPI_DIVIDER_LEN_32
+
+`ifdef SPI_DIVIDER_LEN_8
+  `define SPI_DIVIDER_LEN       8    // Can be set from 1 to 8
+`endif                                                          
+`ifdef SPI_DIVIDER_LEN_16                                       
+  `define SPI_DIVIDER_LEN       16   // Can be set from 9 to 16
+`endif                                                          
+`ifdef SPI_DIVIDER_LEN_24                                       
+  `define SPI_DIVIDER_LEN       24   // Can be set from 17 to 24
+`endif                                                          
+`ifdef SPI_DIVIDER_LEN_32                                       
+  `define SPI_DIVIDER_LEN       32   // Can be set from 25 to 32 
+`endif
+
+//
+// Maximum nuber of bits that can be send/received at once. 
+// Use SPI_MAX_CHAR for fine tuning the exact number, when using
+// SPI_MAX_CHAR_32, SPI_MAX_CHAR_24, SPI_MAX_CHAR_16, SPI_MAX_CHAR_8.
+//
+`define SPI_MAX_CHAR_128
+//`define SPI_MAX_CHAR_64
+//`define SPI_MAX_CHAR_32
+//`define SPI_MAX_CHAR_24
+//`define SPI_MAX_CHAR_16
+//`define SPI_MAX_CHAR_8
+
+`ifdef SPI_MAX_CHAR_128
+  `define SPI_MAX_CHAR          128  // Can only be set to 128 
+  `define SPI_CHAR_LEN_BITS     7
+`endif
+`ifdef SPI_MAX_CHAR_64
+  `define SPI_MAX_CHAR          64   // Can only be set to 64 
+  `define SPI_CHAR_LEN_BITS     6
+`endif
+`ifdef SPI_MAX_CHAR_32
+  `define SPI_MAX_CHAR          32   // Can be set from 25 to 32 
+  `define SPI_CHAR_LEN_BITS     5
+`endif
+`ifdef SPI_MAX_CHAR_24
+  `define SPI_MAX_CHAR          24   // Can be set from 17 to 24 
+  `define SPI_CHAR_LEN_BITS     5
+`endif
+`ifdef SPI_MAX_CHAR_16
+  `define SPI_MAX_CHAR          16   // Can be set from 9 to 16 
+  `define SPI_CHAR_LEN_BITS     4
+`endif
+`ifdef SPI_MAX_CHAR_8
+  `define SPI_MAX_CHAR          8    // Can be set from 1 to 8 
+  `define SPI_CHAR_LEN_BITS     3
+`endif
+
+//
+// Number of device select signals. Use SPI_SS_NB for fine tuning the 
+// exact number.
+//
+`define SPI_SS_NB_8
+//`define SPI_SS_NB_16
+//`define SPI_SS_NB_24
+//`define SPI_SS_NB_32
+
+`ifdef SPI_SS_NB_8
+  `define SPI_SS_NB             8    // Can be set from 1 to 8
+`endif
+`ifdef SPI_SS_NB_16
+  `define SPI_SS_NB             16   // Can be set from 9 to 16
+`endif
+`ifdef SPI_SS_NB_24
+  `define SPI_SS_NB             24   // Can be set from 17 to 24
+`endif
+`ifdef SPI_SS_NB_32
+  `define SPI_SS_NB             32   // Can be set from 25 to 32
+`endif
+
+//
+// Bits of WISHBONE address used for partial decoding of SPI registers.
+//
+`define SPI_OFS_BITS	          4:2
+
+//
+// Register offset
+//
+`define SPI_RX_0                0
+`define SPI_RX_1                1
+`define SPI_RX_2                2
+`define SPI_RX_3                3
+`define SPI_TX_0                0
+`define SPI_TX_1                1
+`define SPI_TX_2                2
+`define SPI_TX_3                3
+`define SPI_CTRL                4
+`define SPI_DEVIDE              5
+`define SPI_SS                  6
+
+//
+// Number of bits in ctrl register
+//
+`define SPI_CTRL_BIT_NB         14
+
+//
+// Control register bit position
+//
+`define SPI_CTRL_ASS            13
+`define SPI_CTRL_IE             12
+`define SPI_CTRL_LSB            11
+`define SPI_CTRL_TX_NEGEDGE     10
+`define SPI_CTRL_RX_NEGEDGE     9
+`define SPI_CTRL_GO             8
+`define SPI_CTRL_RES_1          7
+`define SPI_CTRL_CHAR_LEN       6:0
+

modules/wishbone/wb_spi/spi_shift.v

+//////////////////////////////////////////////////////////////////////
+////                                                              ////
+////  spi_shift.v                                                 ////
+////                                                              ////
+////  This file is part of the SPI IP core project                ////
+////  http://www.opencores.org/projects/spi/                      ////
+////                                                              ////
+////  Author(s):                                                  ////
+////      - Simon Srot (simons@opencores.org)                     ////
+////                                                              ////
+////  All additional information is avaliable in the Readme.txt   ////
+////  file.                                                       ////
+////                                                              ////
+//////////////////////////////////////////////////////////////////////
+////                                                              ////
+//// Copyright (C) 2002 Authors                                   ////
+////                                                              ////
+//// 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                     ////
+////                                                              ////
+//////////////////////////////////////////////////////////////////////
+
+`include "spi_defines.v"
+`include "timescale.v"
+
+module spi_shift (clk, rst, latch, byte_sel, len, lsb, go,
+                  pos_edge, neg_edge, rx_negedge, tx_negedge,
+                  tip, last, 
+                  p_in, p_out, s_clk, s_in, s_out);
+
+  parameter Tp = 1;
+  
+  input                          clk;          // system clock
+  input                          rst;          // reset
+  input                    [3:0] latch;        // latch signal for storing the data in shift register
+  input                    [3:0] byte_sel;     // byte select signals for storing the data in shift register
+  input [`SPI_CHAR_LEN_BITS-1:0] len;          // data len in bits (minus one)
+  input                          lsb;          // lbs first on the line
+  input                          go;           // start stansfer
+  input                          pos_edge;     // recognize posedge of sclk
+  input                          neg_edge;     // recognize negedge of sclk
+  input                          rx_negedge;   // s_in is sampled on negative edge 
+  input                          tx_negedge;   // s_out is driven on negative edge
+  output                         tip;          // transfer in progress
+  output                         last;         // last bit
+  input                   [31:0] p_in;         // parallel in
+  output     [`SPI_MAX_CHAR-1:0] p_out;        // parallel out
+  input                          s_clk;        // serial clock
+  input                          s_in;         // serial in
+  output                         s_out;        // serial out
+                                               
+  reg                            s_out;        
+  reg                            tip;
+                              
+  reg     [`SPI_CHAR_LEN_BITS:0] cnt;          // data bit count
+  reg        [`SPI_MAX_CHAR-1:0] data;         // shift register
+  wire    [`SPI_CHAR_LEN_BITS:0] tx_bit_pos;   // next bit position
+  wire    [`SPI_CHAR_LEN_BITS:0] rx_bit_pos;   // next bit position
+  wire                           rx_clk;       // rx clock enable
+  wire                           tx_clk;       // tx clock enable
+  
+  assign p_out = data;
+  
+  assign tx_bit_pos = lsb ? {!(|len), len} - cnt : cnt - {{`SPI_CHAR_LEN_BITS{1'b0}},1'b1};
+  assign rx_bit_pos = lsb ? {!(|len), len} - (rx_negedge ? cnt + {{`SPI_CHAR_LEN_BITS{1'b0}},1'b1} : cnt) : 
+                            (rx_negedge ? cnt : cnt - {{`SPI_CHAR_LEN_BITS{1'b0}},1'b1});
+  
+  assign last = !(|cnt);
+  
+  assign rx_clk = (rx_negedge ? neg_edge : pos_edge) && (!last || s_clk);
+  assign tx_clk = (tx_negedge ? neg_edge : pos_edge) && !last;
+  
+  // Character bit counter
+  always @(posedge clk or posedge rst)
+  begin
+    if(rst)
+      cnt <= #Tp {`SPI_CHAR_LEN_BITS+1{1'b0}};
+    else
+      begin
+        if(tip)
+          cnt <= #Tp pos_edge ? (cnt - {{`SPI_CHAR_LEN_BITS{1'b0}}, 1'b1}) : cnt;
+        else
+          cnt <= #Tp !(|len) ? {1'b1, {`SPI_CHAR_LEN_BITS{1'b0}}} : {1'b0, len};
+      end
+  end
+  
+  // Transfer in progress
+  always @(posedge clk or posedge rst)
+  begin
+    if(rst)
+      tip <= #Tp 1'b0;
+  else if(go && ~tip)
+    tip <= #Tp 1'b1;
+  else if(tip && last && pos_edge)
+    tip <= #Tp 1'b0;
+  end
+  
+  // Sending bits to the line
+  always @(posedge clk or posedge rst)
+  begin
+    if (rst)
+      s_out   <= #Tp 1'b0;
+    else
+      s_out <= #Tp (tx_clk || !tip) ? data[tx_bit_pos[`SPI_CHAR_LEN_BITS-1:0]] : s_out;
+  end
+  
+  // Receiving bits from the line
+  always @(posedge clk or posedge rst)
+  begin
+    if (rst)
+      data   <= #Tp {`SPI_MAX_CHAR{1'b0}};
+`ifdef SPI_MAX_CHAR_128
+    else if (latch[0] && !tip)
+      begin
+        if (byte_sel[3])
+          data[31:24] <= #Tp p_in[31:24];
+        if (byte_sel[2])
+          data[23:16] <= #Tp p_in[23:16];
+        if (byte_sel[1])
+          data[15:8] <= #Tp p_in[15:8];
+        if (byte_sel[0])
+          data[7:0] <= #Tp p_in[7:0];
+      end
+    else if (latch[1] && !tip)
+      begin
+        if (byte_sel[3])
+          data[63:56] <= #Tp p_in[31:24];
+        if (byte_sel[2])
+          data[55:48] <= #Tp p_in[23:16];
+        if (byte_sel[1])
+          data[47:40] <= #Tp p_in[15:8];
+        if (byte_sel[0])
+          data[39:32] <= #Tp p_in[7:0];
+      end
+    else if (latch[2] && !tip)
+      begin
+        if (byte_sel[3])
+          data[95:88] <= #Tp p_in[31:24];
+        if (byte_sel[2])
+          data[87:80] <= #Tp p_in[23:16];
+        if (byte_sel[1])
+          data[79:72] <= #Tp p_in[15:8];
+        if (byte_sel[0])
+          data[71:64] <= #Tp p_in[7:0];
+      end
+    else if (latch[3] && !tip)
+      begin
+        if (byte_sel[3])
+          data[127:120] <= #Tp p_in[31:24];
+        if (byte_sel[2])
+          data[119:112] <= #Tp p_in[23:16];
+        if (byte_sel[1])
+          data[111:104] <= #Tp p_in[15:8];
+        if (byte_sel[0])
+          data[103:96] <= #Tp p_in[7:0];
+      end
+`else
+`ifdef SPI_MAX_CHAR_64
+    else if (latch[0] && !tip)
+      begin
+        if (byte_sel[3])
+          data[31:24] <= #Tp p_in[31:24];
+        if (byte_sel[2])
+          data[23:16] <= #Tp p_in[23:16];
+        if (byte_sel[1])
+          data[15:8] <= #Tp p_in[15:8];
+        if (byte_sel[0])
+          data[7:0] <= #Tp p_in[7:0];
+      end
+    else if (latch[1] && !tip)
+      begin
+        if (byte_sel[3])
+          data[63:56] <= #Tp p_in[31:24];
+        if (byte_sel[2])
+          data[55:48] <= #Tp p_in[23:16];
+        if (byte_sel[1])
+          data[47:40] <= #Tp p_in[15:8];
+        if (byte_sel[0])
+          data[39:32] <= #Tp p_in[7:0];
+      end
+`else
+    else if (latch[0] && !tip)
+      begin
+      `ifdef SPI_MAX_CHAR_8
+        if (byte_sel[0])
+          data[`SPI_MAX_CHAR-1:0] <= #Tp p_in[`SPI_MAX_CHAR-1:0];
+      `endif
+      `ifdef SPI_MAX_CHAR_16
+        if (byte_sel[0])
+          data[7:0] <= #Tp p_in[7:0];
+        if (byte_sel[1])
+          data[`SPI_MAX_CHAR-1:8] <= #Tp p_in[`SPI_MAX_CHAR-1:8];
+      `endif
+      `ifdef SPI_MAX_CHAR_24
+        if (byte_sel[0])
+          data[7:0] <= #Tp p_in[7:0];
+        if (byte_sel[1])
+          data[15:8] <= #Tp p_in[15:8];
+        if (byte_sel[2])
+          data[`SPI_MAX_CHAR-1:16] <= #Tp p_in[`SPI_MAX_CHAR-1:16];
+      `endif
+      `ifdef SPI_MAX_CHAR_32
+        if (byte_sel[0])
+          data[7:0] <= #Tp p_in[7:0];
+        if (byte_sel[1])
+          data[15:8] <= #Tp p_in[15:8];
+        if (byte_sel[2])
+          data[23:16] <= #Tp p_in[23:16];
+        if (byte_sel[3])
+          data[`SPI_MAX_CHAR-1:24] <= #Tp p_in[`SPI_MAX_CHAR-1:24];
+      `endif
+      end
+`endif
+`endif
+    else
+      data[rx_bit_pos[`SPI_CHAR_LEN_BITS-1:0]] <= #Tp rx_clk ? s_in : data[rx_bit_pos[`SPI_CHAR_LEN_BITS-1:0]];
+  end
+  
+endmodule
+

modules/wishbone/wb_spi/spi_top.v

+//////////////////////////////////////////////////////////////////////
+////                                                              ////
+////  spi_top.v                                                   ////
+////                                                              ////
+////  This file is part of the SPI IP core project                ////
+////  http://www.opencores.org/projects/spi/                      ////
+////                                                              ////
+////  Author(s):                                                  ////
+////      - Simon Srot (simons@opencores.org)                     ////
+////                                                              ////
+////  All additional information is avaliable in the Readme.txt   ////
+////  file.                                                       ////
+////                                                              ////
+//////////////////////////////////////////////////////////////////////
+////                                                              ////
+//// Copyright (C) 2002 Authors                                   ////
+////                                                              ////
+//// 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                     ////
+////                                                              ////
+//////////////////////////////////////////////////////////////////////
+
+
+`include "spi_defines.v"
+`include "timescale.v"
+
+module spi_top
+(
+  // Wishbone signals
+  wb_clk_i, wb_rst_i, wb_adr_i, wb_dat_i, wb_dat_o, wb_sel_i,
+  wb_we_i, wb_stb_i, wb_cyc_i, wb_ack_o, wb_err_o, wb_int_o,
+
+  // SPI signals
+  ss_pad_o, sclk_pad_o, mosi_pad_o, miso_pad_i
+);
+
+  parameter Tp = 1;
+
+  // Wishbone signals
+  input                            wb_clk_i;         // master clock input
+  input                            wb_rst_i;         // synchronous active high reset
+  input                      [4:0] wb_adr_i;         // lower address bits
+  input                   [32-1:0] wb_dat_i;         // databus input
+  output                  [32-1:0] wb_dat_o;         // databus output
+  input                      [3:0] wb_sel_i;         // byte select inputs
+  input                            wb_we_i;          // write enable input
+  input                            wb_stb_i;         // stobe/core select signal
+  input                            wb_cyc_i;         // valid bus cycle input
+  output                           wb_ack_o;         // bus cycle acknowledge output
+  output                           wb_err_o;         // termination w/ error
+  output                           wb_int_o;         // interrupt request signal output
+                                                     
+  // SPI signals                                     
+  output          [`SPI_SS_NB-1:0] ss_pad_o;         // slave select
+  output                           sclk_pad_o;       // serial clock
+  output                           mosi_pad_o;       // master out slave in
+  input                            miso_pad_i;       // master in slave out
+                                                     
+  reg                     [32-1:0] wb_dat_o;
+  reg                              wb_ack_o;
+  reg                              wb_int_o;
+                                               
+  // Internal signals
+  reg       [`SPI_DIVIDER_LEN-1:0] divider;          // Divider register
+  reg       [`SPI_CTRL_BIT_NB-1:0] ctrl;             // Control and status register
+  reg             [`SPI_SS_NB-1:0] ss;               // Slave select register
+  reg                     [32-1:0] wb_dat;           // wb data out
+  wire         [`SPI_MAX_CHAR-1:0] rx;               // Rx register
+  wire                             rx_negedge;       // miso is sampled on negative edge
+  wire                             tx_negedge;       // mosi is driven on negative edge
+  wire    [`SPI_CHAR_LEN_BITS-1:0] char_len;         // char len
+  wire                             go;               // go
+  wire                             lsb;              // lsb first on line
+  wire                             ie;               // interrupt enable
+  wire                             ass;              // automatic slave select
+  wire                             spi_divider_sel;  // divider register select
+  wire                             spi_ctrl_sel;     // ctrl register select
+  wire                       [3:0] spi_tx_sel;       // tx_l register select
+  wire                             spi_ss_sel;       // ss register select
+  wire                             tip;              // transfer in progress
+  wire                             pos_edge;         // recognize posedge of sclk
+  wire                             neg_edge;         // recognize negedge of sclk
+  wire                             last_bit;         // marks last character bit
+  
+  // Address decoder
+  assign spi_divider_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`SPI_OFS_BITS] == `SPI_DEVIDE);
+  assign spi_ctrl_sel    = wb_cyc_i & wb_stb_i & (wb_adr_i[`SPI_OFS_BITS] == `SPI_CTRL);
+  assign spi_tx_sel[0]   = wb_cyc_i & wb_stb_i & (wb_adr_i[`SPI_OFS_BITS] == `SPI_TX_0);
+  assign spi_tx_sel[1]   = wb_cyc_i & wb_stb_i & (wb_adr_i[`SPI_OFS_BITS] == `SPI_TX_1);
+  assign spi_tx_sel[2]   = wb_cyc_i & wb_stb_i & (wb_adr_i[`SPI_OFS_BITS] == `SPI_TX_2);
+  assign spi_tx_sel[3]   = wb_cyc_i & wb_stb_i & (wb_adr_i[`SPI_OFS_BITS] == `SPI_TX_3);
+  assign spi_ss_sel      = wb_cyc_i & wb_stb_i & (wb_adr_i[`SPI_OFS_BITS] == `SPI_SS);
+  
+  // Read from registers
+  always @(wb_adr_i or rx or ctrl or divider or ss)
+  begin
+    case (wb_adr_i[`SPI_OFS_BITS])
+`ifdef SPI_MAX_CHAR_128
+      `SPI_RX_0:    wb_dat = rx[31:0];
+      `SPI_RX_1:    wb_dat = rx[63:32];
+      `SPI_RX_2:    wb_dat = rx[95:64];
+      `SPI_RX_3:    wb_dat = {{128-`SPI_MAX_CHAR{1'b0}}, rx[`SPI_MAX_CHAR-1:96]};
+`else
+`ifdef SPI_MAX_CHAR_64
+      `SPI_RX_0:    wb_dat = rx[31:0];
+      `SPI_RX_1:    wb_dat = {{64-`SPI_MAX_CHAR{1'b0}}, rx[`SPI_MAX_CHAR-1:32]};
+      `SPI_RX_2:    wb_dat = 32'b0;
+      `SPI_RX_3:    wb_dat = 32'b0;
+`else
+      `SPI_RX_0:    wb_dat = {{32-`SPI_MAX_CHAR{1'b0}}, rx[`SPI_MAX_CHAR-1:0]};
+      `SPI_RX_1:    wb_dat = 32'b0;
+      `SPI_RX_2:    wb_dat = 32'b0;
+      `SPI_RX_3:    wb_dat = 32'b0;
+`endif
+`endif
+      `SPI_CTRL:    wb_dat = {{32-`SPI_CTRL_BIT_NB{1'b0}}, ctrl};
+      `SPI_DEVIDE:  wb_dat = {{32-`SPI_DIVIDER_LEN{1'b0}}, divider};
+      `SPI_SS:      wb_dat = {{32-`SPI_SS_NB{1'b0}}, ss};
+      default:      wb_dat = 32'bx;
+    endcase
+  end
+  
+  // Wb data out
+  always @(posedge wb_clk_i or posedge wb_rst_i)
+  begin
+    if (wb_rst_i)
+      wb_dat_o <= #Tp 32'b0;
+    else
+      wb_dat_o <= #Tp wb_dat;
+  end
+  
+  // Wb acknowledge
+  always @(posedge wb_clk_i or posedge wb_rst_i)
+  begin
+    if (wb_rst_i)
+      wb_ack_o <= #Tp 1'b0;
+    else
+      wb_ack_o <= #Tp wb_cyc_i & wb_stb_i & ~wb_ack_o;
+  end
+  
+  // Wb error
+  assign wb_err_o = 1'b0;
+  
+  // Interrupt
+  always @(posedge wb_clk_i or posedge wb_rst_i)
+  begin
+    if (wb_rst_i)
+      wb_int_o <= #Tp 1'b0;
+    else if (ie && tip && last_bit && pos_edge)
+      wb_int_o <= #Tp 1'b1;
+    else if (wb_ack_o)
+      wb_int_o <= #Tp 1'b0;
+  end
+  
+  // Divider register
+  always @(posedge wb_clk_i or posedge wb_rst_i)
+  begin
+    if (wb_rst_i)
+        divider <= #Tp {`SPI_DIVIDER_LEN{1'b0}};
+    else if (spi_divider_sel && wb_we_i && !tip)
+      begin
+      `ifdef SPI_DIVIDER_LEN_8
+        if (wb_sel_i[0])
+          divider <= #Tp wb_dat_i[`SPI_DIVIDER_LEN-1:0];
+      `endif
+      `ifdef SPI_DIVIDER_LEN_16
+        if (wb_sel_i[0])
+          divider[7:0] <= #Tp wb_dat_i[7:0];
+        if (wb_sel_i[1])
+          divider[`SPI_DIVIDER_LEN-1:8] <= #Tp wb_dat_i[`SPI_DIVIDER_LEN-1:8];
+      `endif
+      `ifdef SPI_DIVIDER_LEN_24
+        if (wb_sel_i[0])
+          divider[7:0] <= #Tp wb_dat_i[7:0];
+        if (wb_sel_i[1])
+          divider[15:8] <= #Tp wb_dat_i[15:8];
+        if (wb_sel_i[2])
+          divider[`SPI_DIVIDER_LEN-1:16] <= #Tp wb_dat_i[`SPI_DIVIDER_LEN-1:16];
+      `endif
+      `ifdef SPI_DIVIDER_LEN_32
+        if (wb_sel_i[0])
+          divider[7:0] <= #Tp wb_dat_i[7:0];
+        if (wb_sel_i[1])
+          divider[15:8] <= #Tp wb_dat_i[15:8];
+        if (wb_sel_i[2])
+          divider[23:16] <= #Tp wb_dat_i[23:16];
+        if (wb_sel_i[3])
+          divider[`SPI_DIVIDER_LEN-1:24] <= #Tp wb_dat_i[`SPI_DIVIDER_LEN-1:24];
+      `endif
+      end
+  end
+  
+  // Ctrl register
+  always @(posedge wb_clk_i or posedge wb_rst_i)
+  begin
+    if (wb_rst_i)
+      ctrl <= #Tp {`SPI_CTRL_BIT_NB{1'b0}};
+    else if(spi_ctrl_sel && wb_we_i && !tip)
+      begin
+        if (wb_sel_i[0])
+          ctrl[7:0] <= #Tp wb_dat_i[7:0] | {7'b0, ctrl[0]};
+        if (wb_sel_i[1])
+          ctrl[`SPI_CTRL_BIT_NB-1:8] <= #Tp wb_dat_i[`SPI_CTRL_BIT_NB-1:8];
+      end
+    else if(tip && last_bit && pos_edge)
+      ctrl[`SPI_CTRL_GO] <= #Tp 1'b0;
+  end
+  
+  assign rx_negedge = ctrl[`SPI_CTRL_RX_NEGEDGE];
+  assign tx_negedge = ctrl[`SPI_CTRL_TX_NEGEDGE];
+  assign go         = ctrl[`SPI_CTRL_GO];
+  assign char_len   = ctrl[`SPI_CTRL_CHAR_LEN];
+  assign lsb        = ctrl[`SPI_CTRL_LSB];
+  assign ie         = ctrl[`SPI_CTRL_IE];
+  assign ass        = ctrl[`SPI_CTRL_ASS];
+  
+  // Slave select register
+  always @(posedge wb_clk_i or posedge wb_rst_i)
+  begin
+    if (wb_rst_i)
+      ss <= #Tp {`SPI_SS_NB{1'b0}};
+    else if(spi_ss_sel && wb_we_i && !tip)
+      begin
+      `ifdef SPI_SS_NB_8
+        if (wb_sel_i[0])
+          ss <= #Tp wb_dat_i[`SPI_SS_NB-1:0];
+      `endif
+      `ifdef SPI_SS_NB_16
+        if (wb_sel_i[0])
+          ss[7:0] <= #Tp wb_dat_i[7:0];
+        if (wb_sel_i[1])
+          ss[`SPI_SS_NB-1:8] <= #Tp wb_dat_i[`SPI_SS_NB-1:8];
+      `endif
+      `ifdef SPI_SS_NB_24
+        if (wb_sel_i[0])
+          ss[7:0] <= #Tp wb_dat_i[7:0];
+        if (wb_sel_i[1])
+          ss[15:8] <= #Tp wb_dat_i[15:8];
+        if (wb_sel_i[2])
+          ss[`SPI_SS_NB-1:16] <= #Tp wb_dat_i[`SPI_SS_NB-1:16];
+      `endif
+      `ifdef SPI_SS_NB_32
+        if (wb_sel_i[0])
+          ss[7:0] <= #Tp wb_dat_i[7:0];
+        if (wb_sel_i[1])
+          ss[15:8] <= #Tp wb_dat_i[15:8];
+        if (wb_sel_i[2])
+          ss[23:16] <= #Tp wb_dat_i[23:16];
+        if (wb_sel_i[3])
+          ss[`SPI_SS_NB-1:24] <= #Tp wb_dat_i[`SPI_SS_NB-1:24];
+      `endif
+      end
+  end
+  
+  assign ss_pad_o = ~((ss & {`SPI_SS_NB{tip & ass}}) | (ss & {`SPI_SS_NB{!ass}}));
+  
+  spi_clgen clgen (.clk_in(wb_clk_i), .rst(wb_rst_i), .go(go), .enable(tip), .last_clk(last_bit),
+                   .divider(divider), .clk_out(sclk_pad_o), .pos_edge(pos_edge), 
+                   .neg_edge(neg_edge));
+  
+  spi_shift shift (.clk(wb_clk_i), .rst(wb_rst_i), .len(char_len[`SPI_CHAR_LEN_BITS-1:0]),
+                   .latch(spi_tx_sel[3:0] & {4{wb_we_i}}), .byte_sel(wb_sel_i), .lsb(lsb), 
+                   .go(go), .pos_edge(pos_edge), .neg_edge(neg_edge), 
+                   .rx_negedge(rx_negedge), .tx_negedge(tx_negedge),
+                   .tip(tip), .last(last_bit), 
+                   .p_in(wb_dat_i), .p_out(rx), 
+                   .s_clk(sclk_pad_o), .s_in(miso_pad_i), .s_out(mosi_pad_o));
+endmodule
+  

modules/wishbone/wb_spi/timescale.v

+`timescale 1ns / 10ps
+