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//////////////////////////////////////////////////////////////////////
////                                                              ////
////  eth_cop.v                                                   ////
////                                                              ////
////  This file is part of the Ethernet IP core project           ////
////  http://www.opencores.org/project,ethmac                     ////
////                                                              ////
////  Author(s):                                                  ////
////      - Igor Mohor (igorM@opencores.org)                      ////
////                                                              ////
////  All additional information is avaliable in the Readme.txt   ////
////  file.                                                       ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2001, 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                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
//
// CVS Revision History
//
// $Log: not supported by cvs2svn $
// Revision 1.3  2002/10/10 16:43:59  mohor
// Minor $display change.
//
// Revision 1.2  2002/09/09 12:54:13  mohor
// error acknowledge cycle termination added to display.
//
// Revision 1.1  2002/08/14 17:16:07  mohor
// Traffic cop with 2 wishbone master interfaces and 2 wishbona slave
// interfaces:
// - Host connects to the master interface
// - Ethernet master (DMA) connects to the second master interface
// - Memory interface connects to the slave interface
// - Ethernet slave interface (access to registers and BDs) connects to second
//   slave interface
//
//
//
//
//
 
`include "timescale.v"
 
module eth_cop
(
  // WISHBONE common
  wb_clk_i, wb_rst_i,
 
  // WISHBONE MASTER 1
  m1_wb_adr_i, m1_wb_sel_i, m1_wb_we_i,  m1_wb_dat_o,
  m1_wb_dat_i, m1_wb_cyc_i, m1_wb_stb_i, m1_wb_ack_o,
  m1_wb_err_o,
 
  // WISHBONE MASTER 2
  m2_wb_adr_i, m2_wb_sel_i, m2_wb_we_i,  m2_wb_dat_o,
  m2_wb_dat_i, m2_wb_cyc_i, m2_wb_stb_i, m2_wb_ack_o,
  m2_wb_err_o,
 
  // WISHBONE slave 1
        s1_wb_adr_o, s1_wb_sel_o, s1_wb_we_o,  s1_wb_cyc_o,
        s1_wb_stb_o, s1_wb_ack_i, s1_wb_err_i, s1_wb_dat_i,
        s1_wb_dat_o,
 
  // WISHBONE slave 2
        s2_wb_adr_o, s2_wb_sel_o, s2_wb_we_o,  s2_wb_cyc_o,
        s2_wb_stb_o, s2_wb_ack_i, s2_wb_err_i, s2_wb_dat_i,
        s2_wb_dat_o
);
 
parameter ETH_BASE     = 32'hd0000000;
parameter ETH_WIDTH    = 32'h800;
parameter MEMORY_BASE  = 32'h2000;
parameter MEMORY_WIDTH = 32'h10000;
 
// WISHBONE common
input wb_clk_i, wb_rst_i;
 
// WISHBONE MASTER 1
input  [31:0] m1_wb_adr_i, m1_wb_dat_i;
input   [3:0] m1_wb_sel_i;
input         m1_wb_cyc_i, m1_wb_stb_i, m1_wb_we_i;
output [31:0] m1_wb_dat_o;
output        m1_wb_ack_o, m1_wb_err_o;
 
// WISHBONE MASTER 2
input  [31:0] m2_wb_adr_i, m2_wb_dat_i;
input   [3:0] m2_wb_sel_i;
input         m2_wb_cyc_i, m2_wb_stb_i, m2_wb_we_i;
output [31:0] m2_wb_dat_o;
output        m2_wb_ack_o, m2_wb_err_o;
 
// WISHBONE slave 1
input  [31:0] s1_wb_dat_i;
input         s1_wb_ack_i, s1_wb_err_i;
output [31:0] s1_wb_adr_o, s1_wb_dat_o;
output  [3:0] s1_wb_sel_o;
output        s1_wb_we_o,  s1_wb_cyc_o, s1_wb_stb_o;
 
// WISHBONE slave 2
input  [31:0] s2_wb_dat_i;
input         s2_wb_ack_i, s2_wb_err_i;
output [31:0] s2_wb_adr_o, s2_wb_dat_o;
output  [3:0] s2_wb_sel_o;
output        s2_wb_we_o,  s2_wb_cyc_o, s2_wb_stb_o;
 
reg           m1_in_progress;
reg           m2_in_progress;
reg    [31:0] s1_wb_adr_o;
reg     [3:0] s1_wb_sel_o;
reg           s1_wb_we_o;
reg    [31:0] s1_wb_dat_o;
reg           s1_wb_cyc_o;
reg           s1_wb_stb_o;
reg    [31:0] s2_wb_adr_o;
reg     [3:0] s2_wb_sel_o;
reg           s2_wb_we_o;
reg    [31:0] s2_wb_dat_o;
reg           s2_wb_cyc_o;
reg           s2_wb_stb_o;
 
reg           m1_wb_ack_o;
reg    [31:0] m1_wb_dat_o;
reg           m2_wb_ack_o;
reg    [31:0] m2_wb_dat_o;
 
reg           m1_wb_err_o;
reg           m2_wb_err_o;
 
wire m_wb_access_finished;
wire m1_addressed_s1 = (m1_wb_adr_i >= ETH_BASE) &
                       (m1_wb_adr_i < (ETH_BASE + ETH_WIDTH));
wire m1_addressed_s2 = (m1_wb_adr_i >= MEMORY_BASE) &
                       (m1_wb_adr_i < (MEMORY_BASE + MEMORY_WIDTH));
wire m2_addressed_s1 = (m2_wb_adr_i >= ETH_BASE) &
                       (m2_wb_adr_i < (ETH_BASE + ETH_WIDTH));
wire m2_addressed_s2 = (m2_wb_adr_i >= MEMORY_BASE) &
                       (m2_wb_adr_i < (MEMORY_BASE + MEMORY_WIDTH));
 
wire m1_req = m1_wb_cyc_i & m1_wb_stb_i & (m1_addressed_s1 | m1_addressed_s2);
wire m2_req = m2_wb_cyc_i & m2_wb_stb_i & (m2_addressed_s1 | m2_addressed_s2);
 
always @ (posedge wb_clk_i or posedge wb_rst_i)
begin
  if(wb_rst_i)
    begin
      m1_in_progress <= 0;
      m2_in_progress <= 0;
      s1_wb_adr_o    <= 0;
      s1_wb_sel_o    <= 0;
      s1_wb_we_o     <= 0;
      s1_wb_dat_o    <= 0;
      s1_wb_cyc_o    <= 0;
      s1_wb_stb_o    <= 0;
      s2_wb_adr_o    <= 0;
      s2_wb_sel_o    <= 0;
      s2_wb_we_o     <= 0;
      s2_wb_dat_o    <= 0;
      s2_wb_cyc_o    <= 0;
      s2_wb_stb_o    <= 0;
    end
  else
    begin
      case({m1_in_progress, m2_in_progress, m1_req, m2_req, m_wb_access_finished})  // synopsys_full_case synopsys_paralel_case
        5'b00_10_0, 5'b00_11_0 :
          begin
            m1_in_progress <= 1'b1;  // idle: m1 or (m1 & m2) want access: m1 -> m
            if(m1_addressed_s1)
              begin
                s1_wb_adr_o <= m1_wb_adr_i;
                s1_wb_sel_o <= m1_wb_sel_i;
                s1_wb_we_o  <= m1_wb_we_i;
                s1_wb_dat_o <= m1_wb_dat_i;
                s1_wb_cyc_o <= 1'b1;
                s1_wb_stb_o <= 1'b1;
              end
            else if(m1_addressed_s2)
              begin
                s2_wb_adr_o <= m1_wb_adr_i;
                s2_wb_sel_o <= m1_wb_sel_i;
                s2_wb_we_o  <= m1_wb_we_i;
                s2_wb_dat_o <= m1_wb_dat_i;
                s2_wb_cyc_o <= 1'b1;
                s2_wb_stb_o <= 1'b1;
              end
            else
              $display("(%t)(%m)WISHBONE ERROR: Unspecified address space accessed", $time);
          end
        5'b00_01_0 :
          begin
            m2_in_progress <= 1'b1;  // idle: m2 wants access: m2 -> m
            if(m2_addressed_s1)
              begin
                s1_wb_adr_o <= m2_wb_adr_i;
                s1_wb_sel_o <= m2_wb_sel_i;
                s1_wb_we_o  <= m2_wb_we_i;
                s1_wb_dat_o <= m2_wb_dat_i;
                s1_wb_cyc_o <= 1'b1;
                s1_wb_stb_o <= 1'b1;
              end
            else if(m2_addressed_s2)
              begin
                s2_wb_adr_o <= m2_wb_adr_i;
                s2_wb_sel_o <= m2_wb_sel_i;
                s2_wb_we_o  <= m2_wb_we_i;
                s2_wb_dat_o <= m2_wb_dat_i;
                s2_wb_cyc_o <= 1'b1;
                s2_wb_stb_o <= 1'b1;
              end
            else
              $display("(%t)(%m)WISHBONE ERROR: Unspecified address space accessed", $time);
          end
        5'b10_10_1, 5'b10_11_1 :
          begin
            m1_in_progress <= 1'b0;  // m1 in progress. Cycle is finished. Send ack or err to m1.
            if(m1_addressed_s1)
              begin
                s1_wb_cyc_o <= 1'b0;
                s1_wb_stb_o <= 1'b0;
              end
            else if(m1_addressed_s2)
              begin
                s2_wb_cyc_o <= 1'b0;
                s2_wb_stb_o <= 1'b0;
              end
          end
        5'b01_01_1, 5'b01_11_1 :
          begin
            m2_in_progress <= 1'b0;  // m2 in progress. Cycle is finished. Send ack or err to m2.
            if(m2_addressed_s1)
              begin
                s1_wb_cyc_o <= 1'b0;
                s1_wb_stb_o <= 1'b0;
              end
            else if(m2_addressed_s2)
              begin
                s2_wb_cyc_o <= 1'b0;
                s2_wb_stb_o <= 1'b0;
              end
          end
      endcase
    end
end
 
// Generating Ack for master 1
always @ (m1_in_progress or m1_wb_adr_i or s1_wb_ack_i or s2_wb_ack_i or s1_wb_dat_i or s2_wb_dat_i or m1_addressed_s1 or m1_addressed_s2)
begin
  if(m1_in_progress)
    begin
      if(m1_addressed_s1) begin
        m1_wb_ack_o <= s1_wb_ack_i;
        m1_wb_dat_o <= s1_wb_dat_i;
      end
      else if(m1_addressed_s2) begin
        m1_wb_ack_o <= s2_wb_ack_i;
        m1_wb_dat_o <= s2_wb_dat_i;
      end
    end
  else
    m1_wb_ack_o <= 0;
end
 
 
// Generating Ack for master 2
always @ (m2_in_progress or m2_wb_adr_i or s1_wb_ack_i or s2_wb_ack_i or s1_wb_dat_i or s2_wb_dat_i or m2_addressed_s1 or m2_addressed_s2)
begin
  if(m2_in_progress)
    begin
      if(m2_addressed_s1) begin
        m2_wb_ack_o <= s1_wb_ack_i;
        m2_wb_dat_o <= s1_wb_dat_i;
      end
      else if(m2_addressed_s2) begin
        m2_wb_ack_o <= s2_wb_ack_i;
        m2_wb_dat_o <= s2_wb_dat_i;
      end
    end
  else
    m2_wb_ack_o <= 0;
end
 
 
// Generating Err for master 1
always @ (m1_in_progress or m1_wb_adr_i or s1_wb_err_i or s2_wb_err_i or m2_addressed_s1 or m2_addressed_s2 or
          m1_wb_cyc_i or m1_wb_stb_i)
begin
  if(m1_in_progress)  begin
    if(m1_addressed_s1)
      m1_wb_err_o <= s1_wb_err_i;
    else if(m1_addressed_s2)
      m1_wb_err_o <= s2_wb_err_i;
  end
  else if(m1_wb_cyc_i & m1_wb_stb_i & ~m1_addressed_s1 & ~m1_addressed_s2)
    m1_wb_err_o <= 1'b1;
  else
    m1_wb_err_o <= 1'b0;
end
 
 
// Generating Err for master 2
always @ (m2_in_progress or m2_wb_adr_i or s1_wb_err_i or s2_wb_err_i or m2_addressed_s1 or m2_addressed_s2 or
          m2_wb_cyc_i or m2_wb_stb_i)
begin
  if(m2_in_progress)  begin
    if(m2_addressed_s1)
      m2_wb_err_o <= s1_wb_err_i;
    else if(m2_addressed_s2)
      m2_wb_err_o <= s2_wb_err_i;
  end
  else if(m2_wb_cyc_i & m2_wb_stb_i & ~m2_addressed_s1 & ~m2_addressed_s2)
    m2_wb_err_o <= 1'b1;
  else
    m2_wb_err_o <= 1'b0;
end
 
 
assign m_wb_access_finished = m1_wb_ack_o | m1_wb_err_o | m2_wb_ack_o | m2_wb_err_o;
 
 
// Activity monitor
integer cnt;
always @ (posedge wb_clk_i or posedge wb_rst_i)
begin
  if(wb_rst_i)
    cnt <= 0;
  else
  if(s1_wb_ack_i | s1_wb_err_i | s2_wb_ack_i | s2_wb_err_i)
    cnt <= 0;
  else
  if(s1_wb_cyc_o | s2_wb_cyc_o)
    cnt <= cnt+1;
end
 
always @ (posedge wb_clk_i)
begin
  if(cnt==1000) begin
    $display("(%0t)(%m) ERROR: WB activity ??? ", $time);
    if(s1_wb_cyc_o) begin
      $display("s1_wb_dat_o = 0x%0x", s1_wb_dat_o);
      $display("s1_wb_adr_o = 0x%0x", s1_wb_adr_o);
      $display("s1_wb_sel_o = 0x%0x", s1_wb_sel_o);
      $display("s1_wb_we_o = 0x%0x", s1_wb_we_o);
    end
    else if(s2_wb_cyc_o) begin
      $display("s2_wb_dat_o = 0x%0x", s2_wb_dat_o);
      $display("s2_wb_adr_o = 0x%0x", s2_wb_adr_o);
      $display("s2_wb_sel_o = 0x%0x", s2_wb_sel_o);
      $display("s2_wb_we_o = 0x%0x", s2_wb_we_o);
    end
 
    $stop;
  end
end
 
 
always @ (posedge wb_clk_i)
begin
  if(s1_wb_err_i & s1_wb_cyc_o) begin
    $display("(%0t) ERROR: WB cycle finished with error acknowledge ", $time);
    $display("s1_wb_dat_o = 0x%0x", s1_wb_dat_o);
    $display("s1_wb_adr_o = 0x%0x", s1_wb_adr_o);
    $display("s1_wb_sel_o = 0x%0x", s1_wb_sel_o);
    $display("s1_wb_we_o = 0x%0x", s1_wb_we_o);
    $stop;
  end
  if(s2_wb_err_i & s2_wb_cyc_o) begin
    $display("(%0t) ERROR: WB cycle finished with error acknowledge ", $time);
    $display("s2_wb_dat_o = 0x%0x", s2_wb_dat_o);
    $display("s2_wb_adr_o = 0x%0x", s2_wb_adr_o);
    $display("s2_wb_sel_o = 0x%0x", s2_wb_sel_o);
    $display("s2_wb_we_o = 0x%0x", s2_wb_we_o);
    $stop;
  end
end
 
 
 
endmodule

Line No.	Rev	Author	Line
1	129	mohor	`//////////////////////////////////////////////////////////////////////`
2			`//// ////`
3			`//// eth_cop.v ////`
4			`//// ////`
5			`//// This file is part of the Ethernet IP core project ////`
6	346	olof	`//// http://www.opencores.org/project,ethmac ////`
7	129	mohor	`//// ////`
8			`//// Author(s): ////`
9			`//// - Igor Mohor (igorM@opencores.org) ////`
10			`//// ////`
11			`//// All additional information is avaliable in the Readme.txt ////`
12			`//// file. ////`
13			`//// ////`
14			`//////////////////////////////////////////////////////////////////////`
15			`//// ////`
16			`//// Copyright (C) 2001, 2002 Authors ////`
17			`//// ////`
18			`//// This source file may be used and distributed without ////`
19			`//// restriction provided that this copyright statement is not ////`
20			`//// removed from the file and that any derivative work contains ////`
21			`//// the original copyright notice and the associated disclaimer. ////`
22			`//// ////`
23			`//// This source file is free software; you can redistribute it ////`
24			`//// and/or modify it under the terms of the GNU Lesser General ////`
25			`//// Public License as published by the Free Software Foundation; ////`
26			`//// either version 2.1 of the License, or (at your option) any ////`
27			`//// later version. ////`
28			`//// ////`
29			`//// This source is distributed in the hope that it will be ////`
30			`//// useful, but WITHOUT ANY WARRANTY; without even the implied ////`
31			`//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////`
32			`//// PURPOSE. See the GNU Lesser General Public License for more ////`
33			`//// details. ////`
34			`//// ////`
35			`//// You should have received a copy of the GNU Lesser General ////`
36			`//// Public License along with this source; if not, download it ////`
37			`//// from http://www.opencores.org/lgpl.shtml ////`
38			`//// ////`
39			`//////////////////////////////////////////////////////////////////////`
40			`//`
41			`// CVS Revision History`
42			`//`
43			`// $Log: not supported by cvs2svn $`
44	286	mohor	`// Revision 1.3 2002/10/10 16:43:59 mohor`
45			`// Minor $display change.`
46			`//`
47	212	mohor	`// Revision 1.2 2002/09/09 12:54:13 mohor`
48			`// error acknowledge cycle termination added to display.`
49			`//`
50	160	mohor	`// Revision 1.1 2002/08/14 17:16:07 mohor`
51			`// Traffic cop with 2 wishbone master interfaces and 2 wishbona slave`
52			`// interfaces:`
53			`// - Host connects to the master interface`
54			`// - Ethernet master (DMA) connects to the second master interface`
55			`// - Memory interface connects to the slave interface`
56			`// - Ethernet slave interface (access to registers and BDs) connects to second`
57			`// slave interface`
58	129	mohor	`//`
59			`//`
60			`//`
61			`//`
62	160	mohor	`//`
63	129	mohor
64			`include "timescale.v"
65
66			`module eth_cop`
67			`(`
68			`// WISHBONE common`
69			`wb_clk_i, wb_rst_i,`
70
71			`// WISHBONE MASTER 1`
72			`m1_wb_adr_i, m1_wb_sel_i, m1_wb_we_i, m1_wb_dat_o,`
73			`m1_wb_dat_i, m1_wb_cyc_i, m1_wb_stb_i, m1_wb_ack_o,`
74			`m1_wb_err_o,`
75
76			`// WISHBONE MASTER 2`
77			`m2_wb_adr_i, m2_wb_sel_i, m2_wb_we_i, m2_wb_dat_o,`
78			`m2_wb_dat_i, m2_wb_cyc_i, m2_wb_stb_i, m2_wb_ack_o,`
79			`m2_wb_err_o,`
80
81			`// WISHBONE slave 1`
82			`s1_wb_adr_o, s1_wb_sel_o, s1_wb_we_o, s1_wb_cyc_o,`
83			`s1_wb_stb_o, s1_wb_ack_i, s1_wb_err_i, s1_wb_dat_i,`
84			`s1_wb_dat_o,`
85
86			`// WISHBONE slave 2`
87			`s2_wb_adr_o, s2_wb_sel_o, s2_wb_we_o, s2_wb_cyc_o,`
88			`s2_wb_stb_o, s2_wb_ack_i, s2_wb_err_i, s2_wb_dat_i,`
89			`s2_wb_dat_o`
90			`);`
91
92	351	olof	`parameter ETH_BASE = 32'hd0000000;`
93			`parameter ETH_WIDTH = 32'h800;`
94			`parameter MEMORY_BASE = 32'h2000;`
95			`parameter MEMORY_WIDTH = 32'h10000;`
96
97	129	mohor	`// WISHBONE common`
98			`input wb_clk_i, wb_rst_i;`
99
100			`// WISHBONE MASTER 1`
101			`input [31:0] m1_wb_adr_i, m1_wb_dat_i;`
102			`input [3:0] m1_wb_sel_i;`
103			`input m1_wb_cyc_i, m1_wb_stb_i, m1_wb_we_i;`
104			`output [31:0] m1_wb_dat_o;`
105			`output m1_wb_ack_o, m1_wb_err_o;`
106
107			`// WISHBONE MASTER 2`
108			`input [31:0] m2_wb_adr_i, m2_wb_dat_i;`
109			`input [3:0] m2_wb_sel_i;`
110			`input m2_wb_cyc_i, m2_wb_stb_i, m2_wb_we_i;`
111			`output [31:0] m2_wb_dat_o;`
112			`output m2_wb_ack_o, m2_wb_err_o;`
113
114			`// WISHBONE slave 1`
115			`input [31:0] s1_wb_dat_i;`
116			`input s1_wb_ack_i, s1_wb_err_i;`
117			`output [31:0] s1_wb_adr_o, s1_wb_dat_o;`
118			`output [3:0] s1_wb_sel_o;`
119			`output s1_wb_we_o, s1_wb_cyc_o, s1_wb_stb_o;`
120
121			`// WISHBONE slave 2`
122			`input [31:0] s2_wb_dat_i;`
123			`input s2_wb_ack_i, s2_wb_err_i;`
124			`output [31:0] s2_wb_adr_o, s2_wb_dat_o;`
125			`output [3:0] s2_wb_sel_o;`
126			`output s2_wb_we_o, s2_wb_cyc_o, s2_wb_stb_o;`
127
128			`reg m1_in_progress;`
129			`reg m2_in_progress;`
130			`reg [31:0] s1_wb_adr_o;`
131			`reg [3:0] s1_wb_sel_o;`
132			`reg s1_wb_we_o;`
133			`reg [31:0] s1_wb_dat_o;`
134			`reg s1_wb_cyc_o;`
135			`reg s1_wb_stb_o;`
136			`reg [31:0] s2_wb_adr_o;`
137			`reg [3:0] s2_wb_sel_o;`
138			`reg s2_wb_we_o;`
139			`reg [31:0] s2_wb_dat_o;`
140			`reg s2_wb_cyc_o;`
141			`reg s2_wb_stb_o;`
142
143			`reg m1_wb_ack_o;`
144			`reg [31:0] m1_wb_dat_o;`
145			`reg m2_wb_ack_o;`
146			`reg [31:0] m2_wb_dat_o;`
147
148			`reg m1_wb_err_o;`
149			`reg m2_wb_err_o;`
150
151			`wire m_wb_access_finished;`
152	351	olof	`wire m1_addressed_s1 = (m1_wb_adr_i >= ETH_BASE) &`
153			`(m1_wb_adr_i < (ETH_BASE + ETH_WIDTH));`
154			`wire m1_addressed_s2 = (m1_wb_adr_i >= MEMORY_BASE) &`
155			`(m1_wb_adr_i < (MEMORY_BASE + MEMORY_WIDTH));`
156			`wire m2_addressed_s1 = (m2_wb_adr_i >= ETH_BASE) &`
157			`(m2_wb_adr_i < (ETH_BASE + ETH_WIDTH));`
158			`wire m2_addressed_s2 = (m2_wb_adr_i >= MEMORY_BASE) &`
159			`(m2_wb_adr_i < (MEMORY_BASE + MEMORY_WIDTH));`
160	350	olof
161			`wire m1_req = m1_wb_cyc_i & m1_wb_stb_i & (m1_addressed_s1 \| m1_addressed_s2);`
162			`wire m2_req = m2_wb_cyc_i & m2_wb_stb_i & (m2_addressed_s1 \| m2_addressed_s2);`
163	129	mohor
164			`always @ (posedge wb_clk_i or posedge wb_rst_i)`
165			`begin`
166			`if(wb_rst_i)`
167			`begin`
168	352	olof	`m1_in_progress <= 0;`
169			`m2_in_progress <= 0;`
170			`s1_wb_adr_o <= 0;`
171			`s1_wb_sel_o <= 0;`
172			`s1_wb_we_o <= 0;`
173			`s1_wb_dat_o <= 0;`
174			`s1_wb_cyc_o <= 0;`
175			`s1_wb_stb_o <= 0;`
176			`s2_wb_adr_o <= 0;`
177			`s2_wb_sel_o <= 0;`
178			`s2_wb_we_o <= 0;`
179			`s2_wb_dat_o <= 0;`
180			`s2_wb_cyc_o <= 0;`
181			`s2_wb_stb_o <= 0;`
182	129	mohor	`end`
183			`else`
184			`begin`
185			`case({m1_in_progress, m2_in_progress, m1_req, m2_req, m_wb_access_finished}) // synopsys_full_case synopsys_paralel_case`
186			`5'b00_10_0, 5'b00_11_0 :`
187			`begin`
188	352	olof	`m1_in_progress <= 1'b1; // idle: m1 or (m1 & m2) want access: m1 -> m`
189	350	olof	`if(m1_addressed_s1)`
190	129	mohor	`begin`
191	352	olof	`s1_wb_adr_o <= m1_wb_adr_i;`
192			`s1_wb_sel_o <= m1_wb_sel_i;`
193			`s1_wb_we_o <= m1_wb_we_i;`
194			`s1_wb_dat_o <= m1_wb_dat_i;`
195			`s1_wb_cyc_o <= 1'b1;`
196			`s1_wb_stb_o <= 1'b1;`
197	129	mohor	`end`
198	350	olof	`else if(m1_addressed_s2)`
199	129	mohor	`begin`
200	352	olof	`s2_wb_adr_o <= m1_wb_adr_i;`
201			`s2_wb_sel_o <= m1_wb_sel_i;`
202			`s2_wb_we_o <= m1_wb_we_i;`
203			`s2_wb_dat_o <= m1_wb_dat_i;`
204			`s2_wb_cyc_o <= 1'b1;`
205			`s2_wb_stb_o <= 1'b1;`
206	129	mohor	`end`
207			`else`
208			`$display("(%t)(%m)WISHBONE ERROR: Unspecified address space accessed", $time);`
209			`end`
210			`5'b00_01_0 :`
211			`begin`
212	352	olof	`m2_in_progress <= 1'b1; // idle: m2 wants access: m2 -> m`
213	350	olof	`if(m2_addressed_s1)`
214	129	mohor	`begin`
215	352	olof	`s1_wb_adr_o <= m2_wb_adr_i;`
216			`s1_wb_sel_o <= m2_wb_sel_i;`
217			`s1_wb_we_o <= m2_wb_we_i;`
218			`s1_wb_dat_o <= m2_wb_dat_i;`
219			`s1_wb_cyc_o <= 1'b1;`
220			`s1_wb_stb_o <= 1'b1;`
221	129	mohor	`end`
222	350	olof	`else if(m2_addressed_s2)`
223	129	mohor	`begin`
224	352	olof	`s2_wb_adr_o <= m2_wb_adr_i;`
225			`s2_wb_sel_o <= m2_wb_sel_i;`
226			`s2_wb_we_o <= m2_wb_we_i;`
227			`s2_wb_dat_o <= m2_wb_dat_i;`
228			`s2_wb_cyc_o <= 1'b1;`
229			`s2_wb_stb_o <= 1'b1;`
230	129	mohor	`end`
231			`else`
232			`$display("(%t)(%m)WISHBONE ERROR: Unspecified address space accessed", $time);`
233			`end`
234			`5'b10_10_1, 5'b10_11_1 :`
235			`begin`
236	352	olof	`m1_in_progress <= 1'b0; // m1 in progress. Cycle is finished. Send ack or err to m1.`
237	350	olof	`if(m1_addressed_s1)`
238	129	mohor	`begin`
239	352	olof	`s1_wb_cyc_o <= 1'b0;`
240			`s1_wb_stb_o <= 1'b0;`
241	129	mohor	`end`
242	350	olof	`else if(m1_addressed_s2)`
243	129	mohor	`begin`
244	352	olof	`s2_wb_cyc_o <= 1'b0;`
245			`s2_wb_stb_o <= 1'b0;`
246	129	mohor	`end`
247			`end`
248			`5'b01_01_1, 5'b01_11_1 :`
249			`begin`
250	352	olof	`m2_in_progress <= 1'b0; // m2 in progress. Cycle is finished. Send ack or err to m2.`
251	350	olof	`if(m2_addressed_s1)`
252	129	mohor	`begin`
253	352	olof	`s1_wb_cyc_o <= 1'b0;`
254			`s1_wb_stb_o <= 1'b0;`
255	129	mohor	`end`
256	350	olof	`else if(m2_addressed_s2)`
257	129	mohor	`begin`
258	352	olof	`s2_wb_cyc_o <= 1'b0;`
259			`s2_wb_stb_o <= 1'b0;`
260	129	mohor	`end`
261			`end`
262			`endcase`
263			`end`
264			`end`
265
266			`// Generating Ack for master 1`
267	350	olof	`always @ (m1_in_progress or m1_wb_adr_i or s1_wb_ack_i or s2_wb_ack_i or s1_wb_dat_i or s2_wb_dat_i or m1_addressed_s1 or m1_addressed_s2)`
268	129	mohor	`begin`
269			`if(m1_in_progress)`
270			`begin`
271	350	olof	`if(m1_addressed_s1) begin`
272	129	mohor	`m1_wb_ack_o <= s1_wb_ack_i;`
273			`m1_wb_dat_o <= s1_wb_dat_i;`
274			`end`
275	350	olof	`else if(m1_addressed_s2) begin`
276	129	mohor	`m1_wb_ack_o <= s2_wb_ack_i;`
277			`m1_wb_dat_o <= s2_wb_dat_i;`
278			`end`
279			`end`
280			`else`
281			`m1_wb_ack_o <= 0;`
282			`end`
283
284
285			`// Generating Ack for master 2`
286	350	olof	`always @ (m2_in_progress or m2_wb_adr_i or s1_wb_ack_i or s2_wb_ack_i or s1_wb_dat_i or s2_wb_dat_i or m2_addressed_s1 or m2_addressed_s2)`
287	129	mohor	`begin`
288			`if(m2_in_progress)`
289			`begin`
290	350	olof	`if(m2_addressed_s1) begin`
291	129	mohor	`m2_wb_ack_o <= s1_wb_ack_i;`
292			`m2_wb_dat_o <= s1_wb_dat_i;`
293			`end`
294	350	olof	`else if(m2_addressed_s2) begin`
295	129	mohor	`m2_wb_ack_o <= s2_wb_ack_i;`
296			`m2_wb_dat_o <= s2_wb_dat_i;`
297			`end`
298			`end`
299			`else`
300			`m2_wb_ack_o <= 0;`
301			`end`
302
303
304			`// Generating Err for master 1`
305	350	olof	`always @ (m1_in_progress or m1_wb_adr_i or s1_wb_err_i or s2_wb_err_i or m2_addressed_s1 or m2_addressed_s2 or`
306	129	mohor	`m1_wb_cyc_i or m1_wb_stb_i)`
307			`begin`
308			`if(m1_in_progress) begin`
309	350	olof	`if(m1_addressed_s1)`
310	129	mohor	`m1_wb_err_o <= s1_wb_err_i;`
311	350	olof	`else if(m1_addressed_s2)`
312	129	mohor	`m1_wb_err_o <= s2_wb_err_i;`
313			`end`
314	350	olof	`else if(m1_wb_cyc_i & m1_wb_stb_i & ~m1_addressed_s1 & ~m1_addressed_s2)`
315	129	mohor	`m1_wb_err_o <= 1'b1;`
316			`else`
317			`m1_wb_err_o <= 1'b0;`
318			`end`
319
320
321			`// Generating Err for master 2`
322	350	olof	`always @ (m2_in_progress or m2_wb_adr_i or s1_wb_err_i or s2_wb_err_i or m2_addressed_s1 or m2_addressed_s2 or`
323	129	mohor	`m2_wb_cyc_i or m2_wb_stb_i)`
324			`begin`
325			`if(m2_in_progress) begin`
326	350	olof	`if(m2_addressed_s1)`
327	129	mohor	`m2_wb_err_o <= s1_wb_err_i;`
328	350	olof	`else if(m2_addressed_s2)`
329	129	mohor	`m2_wb_err_o <= s2_wb_err_i;`
330			`end`
331	350	olof	`else if(m2_wb_cyc_i & m2_wb_stb_i & ~m2_addressed_s1 & ~m2_addressed_s2)`
332	129	mohor	`m2_wb_err_o <= 1'b1;`
333			`else`
334			`m2_wb_err_o <= 1'b0;`
335			`end`
336
337
338			`assign m_wb_access_finished = m1_wb_ack_o \| m1_wb_err_o \| m2_wb_ack_o \| m2_wb_err_o;`
339
340
341			`// Activity monitor`
342			`integer cnt;`
343			`always @ (posedge wb_clk_i or posedge wb_rst_i)`
344			`begin`
345			`if(wb_rst_i)`
346	352	olof	`cnt <= 0;`
347	129	mohor	`else`
348			`if(s1_wb_ack_i \| s1_wb_err_i \| s2_wb_ack_i \| s2_wb_err_i)`
349	352	olof	`cnt <= 0;`
350	129	mohor	`else`
351			`if(s1_wb_cyc_o \| s2_wb_cyc_o)`
352	352	olof	`cnt <= cnt+1;`
353	129	mohor	`end`
354
355			`always @ (posedge wb_clk_i)`
356			`begin`
357			`if(cnt==1000) begin`
358	212	mohor	`$display("(%0t)(%m) ERROR: WB activity ??? ", $time);`
359	129	mohor	`if(s1_wb_cyc_o) begin`
360			`$display("s1_wb_dat_o = 0x%0x", s1_wb_dat_o);`
361			`$display("s1_wb_adr_o = 0x%0x", s1_wb_adr_o);`
362			`$display("s1_wb_sel_o = 0x%0x", s1_wb_sel_o);`
363			`$display("s1_wb_we_o = 0x%0x", s1_wb_we_o);`
364			`end`
365	160	mohor	`else if(s2_wb_cyc_o) begin`
366	129	mohor	`$display("s2_wb_dat_o = 0x%0x", s2_wb_dat_o);`
367			`$display("s2_wb_adr_o = 0x%0x", s2_wb_adr_o);`
368			`$display("s2_wb_sel_o = 0x%0x", s2_wb_sel_o);`
369			`$display("s2_wb_we_o = 0x%0x", s2_wb_we_o);`
370			`end`
371
372			`$stop;`
373			`end`
374			`end`
375
376
377	160	mohor	`always @ (posedge wb_clk_i)`
378			`begin`
379			`if(s1_wb_err_i & s1_wb_cyc_o) begin`
380			`$display("(%0t) ERROR: WB cycle finished with error acknowledge ", $time);`
381			`$display("s1_wb_dat_o = 0x%0x", s1_wb_dat_o);`
382			`$display("s1_wb_adr_o = 0x%0x", s1_wb_adr_o);`
383			`$display("s1_wb_sel_o = 0x%0x", s1_wb_sel_o);`
384			`$display("s1_wb_we_o = 0x%0x", s1_wb_we_o);`
385			`$stop;`
386			`end`
387			`if(s2_wb_err_i & s2_wb_cyc_o) begin`
388			`$display("(%0t) ERROR: WB cycle finished with error acknowledge ", $time);`
389			`$display("s2_wb_dat_o = 0x%0x", s2_wb_dat_o);`
390			`$display("s2_wb_adr_o = 0x%0x", s2_wb_adr_o);`
391			`$display("s2_wb_sel_o = 0x%0x", s2_wb_sel_o);`
392			`$display("s2_wb_we_o = 0x%0x", s2_wb_we_o);`
393			`$stop;`
394			`end`
395			`end`
396	129	mohor
397	160	mohor
398
399	286	mohor	`endmodule`

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