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//////////////////////////////////////////////////////////////////////
////                                                              ////
////  dbg_wb.v                                                    ////
////                                                              ////
////                                                              ////
////  This file is part of the SoC/OpenRISC Development Interface ////
////  http://www.opencores.org/projects/DebugInterface/           ////
////                                                              ////
////  Author(s):                                                  ////
////       Igor Mohor (igorm@opencores.org)                       ////
////                                                              ////
////                                                              ////
////  All additional information is avaliable in the README.txt   ////
////  file.                                                       ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2000 - 2003 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 1.10  2004/01/13 11:28:14  mohor
// tmp version.
//
// Revision 1.9  2004/01/10 07:50:24  mohor
// temp version.
//
// Revision 1.8  2004/01/09 12:48:44  mohor
// tmp version.
//
// Revision 1.7  2004/01/08 17:53:36  mohor
// tmp version.
//
// Revision 1.6  2004/01/07 11:58:56  mohor
// temp4 version.
//
// Revision 1.5  2004/01/06 17:15:19  mohor
// temp3 version.
//
// Revision 1.4  2004/01/05 12:16:00  mohor
// tmp2 version.
//
// Revision 1.3  2003/12/23 16:22:46  mohor
// Tmp version.
//
// Revision 1.2  2003/12/23 15:26:26  mohor
// Small fix.
//
// Revision 1.1  2003/12/23 15:09:04  mohor
// New directory structure. New version of the debug interface.
//
//
//
 
// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
`include "dbg_wb_defines.v"
 
// Top module
module dbg_wb(
                // JTAG signals
                trst_i,     // trst_i is active high (inverted on higher layers)
                tck_i,
                tdi_i,
                tdo_o,
 
                // TAP states
                shift_dr_i,
                pause_dr_i,
                update_dr_i,
 
                wishbone_ce_i,
                crc_match_i,
                crc_en_o,
                shift_crc_o,
 
                // WISHBONE common signals
                wb_rst_i, wb_clk_i,
 
                // WISHBONE master interface
                wb_adr_o, wb_dat_o, wb_dat_i, wb_cyc_o, wb_stb_o, wb_sel_o,
                wb_we_o, wb_ack_i, wb_cab_o, wb_err_i, wb_cti_o, wb_bte_o
 
              );
 
// JTAG signals
input   trst_i;
input   tck_i;
input   tdi_i;
output  tdo_o;
 
// TAP states
input   shift_dr_i;
input   pause_dr_i;
input   update_dr_i;
 
input   wishbone_ce_i;
input   crc_match_i;
output  crc_en_o;
output  shift_crc_o;
 
// WISHBONE common signals
input         wb_rst_i;                   // WISHBONE reset
input         wb_clk_i;                   // WISHBONE clock
 
// WISHBONE master interface
output [31:0] wb_adr_o;
output [31:0] wb_dat_o;
input  [31:0] wb_dat_i;
output        wb_cyc_o;
output        wb_stb_o;
output  [3:0] wb_sel_o;
output        wb_we_o;
input         wb_ack_i;
output        wb_cab_o;
input         wb_err_i;
output  [2:0] wb_cti_o;
output  [1:0] wb_bte_o;
 
reg           wb_cyc_o;
reg    [31:0] wb_adr_o;
reg    [31:0] wb_dat_o;
reg     [3:0] wb_sel_o;
 
reg           tdo_o;
 
reg    [50:0] dr;
wire          enable;
wire          cmd_cnt_en;
reg     [1:0] cmd_cnt;
wire          cmd_cnt_end;
reg           cmd_cnt_end_q;
wire          addr_len_cnt_en;
reg     [5:0] addr_len_cnt;
reg     [5:0] addr_len_cnt_limit;
wire          addr_len_cnt_end;
wire          crc_cnt_en;
reg     [5:0] crc_cnt;
wire          crc_cnt_end;
reg           crc_cnt_end_q;
wire          data_cnt_en;
reg    [18:0] data_cnt;
reg    [18:0] data_cnt_limit;
wire          data_cnt_end;
reg           data_cnt_end_q;
reg           status_reset_en;
 
reg           crc_match_reg;
 
reg     [2:0] cmd, cmd_old, dr_cmd_latched;
reg    [31:0] adr;
reg    [15:0] len;
reg           start_rd_tck;
reg           start_rd_sync1;
reg           start_wb_rd;
reg           start_wb_rd_q;
reg           start_wr_tck;
reg           start_wr_sync1;
reg           start_wb_wr;
reg           start_wb_wr_q;
 
wire          dr_read;
wire          dr_write;
wire          dr_go;
 
reg           dr_write_latched;
reg           dr_read_latched;
reg           dr_go_latched;
 
wire          status_cnt_end;
 
wire          byte, half, long;
reg           byte_q, half_q, long_q;
reg           byte_q2, half_q2, long_q2;
reg           cmd_read;
reg           cmd_write;
reg           cmd_go;
//reg           cmd_old_read;
 
reg           status_cnt1, status_cnt2, status_cnt3, status_cnt4;
 
reg [`STATUS_LEN -1:0] status;
 
reg wb_error, wb_error_sync, wb_error_tck;
reg wb_overrun, wb_overrun_sync, wb_overrun_tck;
 
reg busy_wb;
reg busy_tck;
reg wb_end;
reg wb_end_rst;
reg wb_end_rst_sync;
reg wb_end_sync;
reg wb_end_tck, wb_end_tck_q;
reg busy_sync;
reg [799:0] TDO_WISHBONE;
reg [399:0] latching_data;
 
reg set_addr, set_addr_sync, set_addr_wb, set_addr_wb_q;
reg read_cycle;
reg write_cycle;
reg [2:0] read_type;
wire [31:0] input_data;
 
wire len_eq_0;
wire crc_cnt_31;
 
assign enable = wishbone_ce_i & shift_dr_i;
assign crc_en_o = enable & crc_cnt_end & (~status_cnt_end);
assign shift_crc_o = enable & status_cnt_end;  // Signals dbg module to shift out the CRC
 
reg [1:0] ptr;
 
//always @ (posedge tck_i)
//begin
//  if (enable & ((~addr_len_cnt_end) | (~cmd_cnt_end) | (~data_cnt_end)))
//    dr <= #1 {dr[49:0], tdi_i};
//end
 
always @ (posedge tck_i)
begin
  if (update_dr_i)
    ptr <= #1 2'h0;
  else if (read_cycle & dr_go_latched & crc_cnt_31) // first latch
    ptr <= #1 ptr + 1'b1;
  else if (read_cycle & cmd_go & byte & (~byte_q))
    ptr <= ptr + 1'd1;
end
 
 
 
always @ (posedge tck_i)
begin
  if (read_cycle & dr_go_latched & crc_cnt_31)
    begin
      dr[31:0] <= #1 input_data[31:0];
      latching_data = "First latch";
    end
  else if (read_cycle & crc_cnt_end)
    begin
      case (read_type)  // synthesis parallel_case full_case
        `WB_READ8 : begin
                      if(byte & (~byte_q))
                        begin
                          case (ptr)    // synthesis parallel_case
                            2'b00 : dr[31:24] <= #1 input_data[31:24];
                            2'b01 : dr[31:24] <= #1 input_data[23:16];
                            2'b10 : dr[31:24] <= #1 input_data[15:8];
                            2'b11 : dr[31:24] <= #1 input_data[7:0];
                          endcase
                          latching_data = "8 bit latched";
                        end
                      else
                        begin
                          dr[31:24] <= #1 {dr[30:24], 1'b0};
                          latching_data = "8 bit shifted";
                        end
                    end
        `WB_READ16: begin
                      if(half & (~half_q))
                        begin
                          if (ptr[1])
                            dr[31:16] <= #1 input_data[31:16];
                          else
                            dr[31:16] <= #1 input_data[15:0];
                          latching_data = "16 bit latched";
                        end
                      else
                        begin
                          dr[31:16] <= #1 {dr[30:16], 1'b0};
                          latching_data = "16 bit shifted";
                        end
                    end
        `WB_READ32: begin
                      if(long & (~long_q))
                        begin
                          dr[31:0] <= #1 input_data[31:0];
                          latching_data = "32 bit latched";
                        end
                      else
                        begin
                          dr[31:0] <= #1 {dr[30:0], 1'b0};
                          latching_data = "32 bit shifted";
                        end
                    end
      endcase
    end
//  else if (enable & ((~addr_len_cnt_end) | (~cmd_cnt_end) | (~data_cnt_end)))
  else if (enable & ((~addr_len_cnt_end) | (~cmd_cnt_end) | ((~data_cnt_end) & write_cycle)))
    begin
    dr <= #1 {dr[49:0], tdi_i};
    latching_data = "tdi shifted in";
    end
  else
    latching_data = "nothing";
end
 
 
assign cmd_cnt_en = enable & (~cmd_cnt_end);
 
always @ (posedge tck_i or posedge trst_i)
begin
  if (trst_i)
    cmd_cnt <= #1 'h0;
  else if (update_dr_i)
    cmd_cnt <= #1 'h0;
  else if (cmd_cnt_en)
    cmd_cnt <= #1 cmd_cnt + 1'b1;
end
 
 
assign addr_len_cnt_en = enable & cmd_cnt_end & (~addr_len_cnt_end);
 
always @ (posedge tck_i or posedge trst_i)
begin
  if (trst_i)
    addr_len_cnt <= #1 'h0;
  else if (update_dr_i)
    addr_len_cnt <= #1 'h0;
  else if (addr_len_cnt_en)
    addr_len_cnt <= #1 addr_len_cnt + 1'b1;
end
 
 
assign data_cnt_en = enable & cmd_cnt_end & (~data_cnt_end);
 
always @ (posedge tck_i or posedge trst_i)
begin
  if (trst_i)
    data_cnt <= #1 'h0;
  else if (update_dr_i)
    data_cnt <= #1 'h0;
//  else if (crc_cnt_31 & dr_go_latched & cmd_read)
//    data_cnt <= #1 'h1;
  else if (data_cnt_en)
    data_cnt <= #1 data_cnt + 1'b1;
end
 
 
 
assign byte = data_cnt[2:0] == 3'd7;
assign half = data_cnt[3:0] == 4'd15;
assign long = data_cnt[4:0] == 5'd31;
 
 
always @ (posedge tck_i)
begin
//  if (crc_cnt == 6'd31) // Reset to zero after crc to load first data byte.   igor !!! This is probably not necessary
//    begin
//      byte_q <= #1 1'b0;
//      half_q <= #1 1'b0;
//      long_q <= #1 1'b0;
//    end
//  else
//    begin
      byte_q <= #1 byte;
      half_q <= #1 half;
      long_q <= #1 long;
      byte_q2 <= #1 byte_q;
      half_q2 <= #1 half_q;
      long_q2 <= #1 long_q;
//    end
end
 
 
 
//assign cmd_read = (cmd == `WB_READ8) | (cmd == `WB_READ16) | (cmd == `WB_READ32);
//assign cmd_write = (cmd == `WB_WRITE8) | (cmd == `WB_WRITE16) | (cmd == `WB_WRITE32);
//assign cmd_go = cmd == `WB_GO;
//assign cmd_old_read = (cmd_old == `WB_READ8) | (cmd_old == `WB_READ16) | (cmd_old == `WB_READ32);
 
 
assign dr_read = (dr[2:0] == `WB_READ8) | (dr[2:0] == `WB_READ16) | (dr[2:0] == `WB_READ32);
assign dr_write = (dr[2:0] == `WB_WRITE8) | (dr[2:0] == `WB_WRITE16) | (dr[2:0] == `WB_WRITE32);
assign dr_go = dr[2:0] == `WB_GO;
 
 
always @ (posedge tck_i)
begin
  if (update_dr_i)
    begin
      dr_cmd_latched = 3'h0;
      dr_read_latched  <= #1 1'b0;
      dr_write_latched  <= #1 1'b0;
      dr_go_latched  <= #1 1'b0;
    end
  else if (cmd_cnt_end & (~cmd_cnt_end_q))
    begin
      dr_cmd_latched = dr[2:0];
      dr_read_latched <= #1 dr_read;
      dr_write_latched <= #1 dr_write;
      dr_go_latched <= #1 dr_go;
    end
end
 
 
always @ (posedge tck_i)
begin
  if (cmd_cnt == 2'h2)
    begin
      if ((~dr[0])  & (~tdi_i))  // (current command is WB_STATUS or WB_GO)
        addr_len_cnt_limit = 6'd0;
      else                                                        // (current command is WB_WRITEx or WB_READx)
        addr_len_cnt_limit = 6'd48;
    end
end
 
 
wire go_prelim;
 
assign go_prelim = (cmd_cnt == 2'h2) & dr[1] & (~dr[0]) & (~tdi_i);
 
/*
always @ (posedge tck_i)
begin
  if (update_dr_i)
    data_cnt_limit = 19'h0;
//  else if (((cmd_cnt == 2'h2) & dr[1] & (~dr[0]) & (~tdi_i) & cmd_write) | // current command is WB_GO and previous command is WB_WRITEx)
  else if ( go_prelim & cmd_write  |                                       // current command is WB_GO and previous command is WB_WRITEx)
            crc_cnt_31 & dr_go_latched & cmd_read                          // current command is WB_GO and previous command is WB_READx)
          )
    data_cnt_limit = {len, 3'b000};
end
*/
 
always @ (posedge tck_i)
begin
  if (update_dr_i)
    data_cnt_limit = {len, 3'b000};
end
 
 
//assign crc_cnt_en = enable & cmd_cnt_end & addr_len_cnt_end & data_cnt_end & (~crc_cnt_end);
assign crc_cnt_en = enable & (~crc_cnt_end) & (cmd_cnt_end & addr_len_cnt_end  & (~write_cycle) | (data_cnt_end & write_cycle));
 
// crc counter
always @ (posedge tck_i or posedge trst_i)
begin
  if (trst_i)
    crc_cnt <= #1 'h0;
  else if(crc_cnt_en)
    crc_cnt <= #1 crc_cnt + 1'b1;
  else if (update_dr_i)
    crc_cnt <= #1 'h0;
end
 
assign cmd_cnt_end  = cmd_cnt  == 2'h3;
assign addr_len_cnt_end = addr_len_cnt == addr_len_cnt_limit;
assign crc_cnt_end  = crc_cnt  == 6'd32;
assign crc_cnt_31 = crc_cnt  == 6'd31;
assign data_cnt_end = (data_cnt == data_cnt_limit);
 
always @ (posedge tck_i)
begin
  crc_cnt_end_q  <= #1 crc_cnt_end;
  cmd_cnt_end_q  <= #1 cmd_cnt_end;
  data_cnt_end_q <= #1 data_cnt_end;
end
 
 
 
always @ (posedge tck_i or posedge trst_i)
begin
  if (trst_i)
    status_cnt1 <= #1 1'b0;
  else if (update_dr_i)
    status_cnt1 <= #1 1'b0;
//  else if (data_cnt_end & (~data_cnt_end_q) & read_cycle |
//           crc_cnt_end & (~crc_cnt_end_q) & (~(cmd_read & dr_go_latched))       // cmd is not changed, yet.
//          )
  else if (data_cnt_end & read_cycle |
           crc_cnt_end & (~(cmd_read & dr_go_latched))       // cmd is not changed, yet.
          )
    status_cnt1 <= #1 1'b1;
end
 
 
always @ (posedge tck_i or posedge trst_i)
begin
  if (trst_i)
    begin
      status_cnt2 <= #1 1'b0;
      status_cnt3 <= #1 1'b0;
      status_cnt4 <= #1 1'b0;
    end
  else if (update_dr_i)
    begin
      status_cnt2 <= #1 1'b0;
      status_cnt3 <= #1 1'b0;
      status_cnt4 <= #1 1'b0;
    end
  else
    begin
      status_cnt2 <= #1 status_cnt1;
      status_cnt3 <= #1 status_cnt2;
      status_cnt4 <= #1 status_cnt3;
    end
end
 
 
assign status_cnt_end = status_cnt4;
 
reg [199:0] status_text;
always @ (posedge tck_i or posedge trst_i)
begin
  if (trst_i)
    begin
    status <= #1 'h0;
    status_text <= #1 "reset";
    end
  else if(crc_cnt_end & (~crc_cnt_end_q) & (~read_cycle))
    begin
    status <= #1 {crc_match_i, wb_error_tck, wb_overrun_tck, busy_tck}; // igor !!! wb_overrun_tck bo uporabljen skupaj z wb_underrun_tck,
    status_text <= #1 "!!!READ";
    end
  else if (data_cnt_end & (~data_cnt_end_q) & read_cycle)
    begin
    status <= #1 {crc_match_reg, wb_error_tck, wb_overrun_tck, busy_tck}; // igor !!! wb_overrun_tck bo uporabljen skupaj z wb_underrun_tck,
    status_text <= #1 "READ";
    end
  else if (shift_dr_i & (~status_cnt_end))
    begin
    status <= #1 {status[0], status[`STATUS_LEN -1:1]};
    status_text <= #1 "shift";
    end
end
// Following status is shifted out:
// 1. bit:          1 if crc is OK, else 0
// 2. bit:          1 while WB access is in progress (busy_tck), else 0
// 3. bit:          1 if overrun occured during write (data couldn't be written fast enough)
// 4. bit:          1 if WB error occured, else 0
 
 
 
always @ (pause_dr_i or busy_tck or crc_cnt_end or crc_cnt_end_q or dr_go_latched or cmd_read or
          crc_match_i or data_cnt_end or data_cnt_end_q or read_cycle or crc_match_reg or status or
          dr or cmd_go)
begin
  if (pause_dr_i)
    begin
    tdo_o = busy_tck;
    TDO_WISHBONE = "busy_tck";
    end
  else if (crc_cnt_end & (~crc_cnt_end_q) & (~(dr_go_latched & cmd_read)))      // cmd is updated not updated, yet
    begin
      tdo_o = crc_match_i;
      TDO_WISHBONE = "crc_match_i";
    end
  else if (read_cycle & crc_cnt_end & (~data_cnt_end))
    begin
    tdo_o = dr[31];
    TDO_WISHBONE = "read data";
    end
  else if (read_cycle & data_cnt_end & (~data_cnt_end_q))     // cmd is already updated
    begin
      tdo_o = crc_match_reg;
      TDO_WISHBONE = "crc_match_reg";
    end
  else if (crc_cnt_end & data_cnt_end)  // cmd is already updated
    begin
      tdo_o = status[0];
      TDO_WISHBONE = "status";
    end
  else
    begin
      tdo_o = 1'b0;
      TDO_WISHBONE = "zero while CRC is shifted in";
    end
end
 
 
 
always @ (posedge tck_i)
begin
  if(crc_cnt_end & (~crc_cnt_end_q))
    crc_match_reg <= #1 crc_match_i;
end
 
/*
always @ (posedge tck_i or posedge trst_i)
begin
  if (trst_i)
    begin
      cmd <= #1 'h0;
      cmd_old <= #1 'h0;
    end
  else if(crc_cnt_end & (~crc_cnt_end_q) & crc_match_i)
    begin
      if (dr_write_latched | dr_read_latched)
        cmd <= #1 dr[50:48];
      else
        cmd <= #1 dr[2:0];
 
      cmd_old <= #1 cmd;
    end
end
*/
 
always @ (posedge tck_i or posedge trst_i)
begin
  if (trst_i)
    begin
      cmd <= #1 'h0;
      cmd_old <= #1 'h0;
      cmd_read <= #1 1'b0;
      cmd_write <= #1 1'b0;
      cmd_go <= #1 1'b0;
//      cmd_old_read <= #1 1'b0; 
    end
  else if(crc_cnt_end & (~crc_cnt_end_q) & crc_match_i)
    begin
      cmd <= #1 dr_cmd_latched;
      cmd_old <= #1 cmd;
      cmd_read <= #1 dr_read_latched;
      cmd_write <= #1 dr_write_latched;
      cmd_go <= #1 dr_go_latched;
//      cmd_old_read <= #1 cmd_read;
    end
end
 
 
always @ (posedge tck_i)
begin
  if(crc_cnt_end & (~crc_cnt_end_q) & crc_match_i)
    begin
      if (dr_write_latched | dr_read_latched)
        begin
          adr <= #1 dr[47:16];
          set_addr <= #1 1'b1;
        end
    end
  else
    set_addr <= #1 1'b0;
end
 
 
always @ (posedge tck_i)
begin
  if(crc_cnt_end & (~crc_cnt_end_q) & crc_match_i & (dr_write_latched | dr_read_latched))
    len <= #1 dr[15:0];
  else if (wb_end_tck & (~wb_end_tck_q))
    begin
      case (read_type)  // synthesis parallel_case full_case
        `WB_READ8 : len <= #1 len - 1'd1;
        `WB_READ16: len <= #1 len - 2'd2;
        `WB_READ32: len <= #1 len - 3'd4;
      endcase
    end
end
 
 
assign len_eq_0 = len == 16'h0;
 
 
 
// Start wishbone read cycle
always @ (posedge tck_i)
begin
  if (cmd_read & go_prelim)                                                             // First read after cmd is entered
    start_rd_tck <= #1 1'b1;
  else if (read_cycle & dr_go_latched & crc_cnt_end & (~crc_cnt_end_q) & (~len_eq_0))   // Second read after first data is latched
    start_rd_tck <= #1 1'b1;
  else if (read_cycle & (~len_eq_0))
    begin
      case (read_type)  // synthesis parallel_case full_case
        `WB_READ8 : begin
                      if(byte & (~byte_q))
                        start_rd_tck <= #1 1'b1;
                      else
                        start_rd_tck <= #1 1'b0;
                    end
        `WB_READ16: begin
                      if(half & (~half_q))
                        start_rd_tck <= #1 1'b1;
                      else
                        start_rd_tck <= #1 1'b0;
                    end
        `WB_READ32: begin
                      if(long & (~long_q))
                        start_rd_tck <= #1 1'b1;
                      else
                        start_rd_tck <= #1 1'b0;
                    end
      endcase
    end
  else
    start_rd_tck <= #1 1'b0;
end
 
 
always @ (posedge tck_i)
begin
  if (update_dr_i)
    read_cycle <= #1 1'b0;
//  else if (cmd_cnt_end & (~cmd_cnt_end_q) & cmd_read & dr_go)
  else if (cmd_read & go_prelim)
    read_cycle <= #1 1'b1;
end
 
 
always @ (posedge tck_i)
begin
//  if (cmd_cnt_end & (~cmd_cnt_end_q) & cmd_read & dr_go)
  if (cmd_read & go_prelim)
    read_type <= #1 cmd;
end
 
 
always @ (posedge tck_i)
begin
  if (update_dr_i)
    write_cycle <= #1 1'b0;
//  else if (cmd_cnt_end & (~cmd_cnt_end_q) & cmd_write & dr_go)
  else if (cmd_write & go_prelim)
    write_cycle <= #1 1'b1;
end
 
 
 
 
 
// Start wishbone write cycle
always @ (posedge tck_i)
begin
  if (dr_go_latched & cmd_write)
    begin
      case (cmd)  // synthesis parallel_case full_case
        `WB_WRITE8  : begin
                        if (byte_q & (~byte_q2))
                          begin
                            start_wr_tck <= #1 1'b1;
                            wb_dat_o <= #1 {4{dr[7:0]}};
                          end
                        else
                          begin
                            start_wr_tck <= #1 1'b0;
                          end
                      end
        `WB_WRITE16 : begin
                        if (half_q & (~half_q2))
                          begin
                            start_wr_tck <= #1 1'b1;
                            wb_dat_o <= #1 {2{dr[15:0]}};
                          end
                        else
                          begin
                            start_wr_tck <= #1 1'b0;
                          end
                      end
        `WB_WRITE32 : begin
                        if (long_q & (~long_q2))
                          begin
                            start_wr_tck <= #1 1'b1;
                            wb_dat_o <= #1 dr[31:0];
                          end
                        else
                          begin
                            start_wr_tck <= #1 1'b0;
                          end
                      end
      endcase
    end
  else
    start_wr_tck <= #1 1'b0;
end
 
 
always @ (posedge wb_clk_i)
begin
  start_rd_sync1  <= #1 start_rd_tck;
  start_wb_rd     <= #1 start_rd_sync1;
  start_wb_rd_q   <= #1 start_wb_rd;
 
  start_wr_sync1  <= #1 start_wr_tck;
  start_wb_wr     <= #1 start_wr_sync1;
  start_wb_wr_q   <= #1 start_wb_wr;
 
  set_addr_sync   <= #1 set_addr;
  set_addr_wb     <= #1 set_addr_sync;
  set_addr_wb_q   <= #1 set_addr_wb;
end
 
 
always @ (posedge wb_clk_i or posedge wb_rst_i)
begin
  if (wb_rst_i)
    wb_cyc_o <= #1 1'b0;
  else if ((start_wb_wr & (~start_wb_wr_q)) | (start_wb_rd & (~start_wb_rd_q)))
    wb_cyc_o <= #1 1'b1;
  else if (wb_ack_i | wb_err_i)
    wb_cyc_o <= #1 1'b0;
end
 
 
 
always @ (posedge wb_clk_i)
begin
  if (set_addr_wb & (~set_addr_wb_q)) // Setting starting address
    wb_adr_o <= #1 adr;
  else if (wb_ack_i)
    begin
      if ((cmd == `WB_WRITE8) | (read_type == `WB_READ8))
        wb_adr_o <= #1 wb_adr_o + 1'd1;
      else if ((cmd == `WB_WRITE16) | (read_type == `WB_READ16))
        wb_adr_o <= #1 wb_adr_o + 2'd2;
      else
        wb_adr_o <= #1 wb_adr_o + 3'd4;
    end
end
 
 
 
//    adr   byte  |  short  |  long
//     0    1000     1100      1111
//     1    0100     err       err
//     2    0010     0011      err
//     3    0001     err       err
 
always @ (posedge wb_clk_i or posedge wb_rst_i)
begin
  if (wb_rst_i)
    wb_sel_o[3:0] <= #1 4'h0;
  else if (cmd_write & dr_go_latched | cmd_read)   // write or first read
    begin
      wb_sel_o[0] <= #1 (cmd[1:0] == 2'b11) & (wb_adr_o[1:0] == 2'b00) | (cmd[1:0] == 2'b01) & (wb_adr_o[1:0] == 2'b11) |
                        (cmd[1:0] == 2'b10) & (wb_adr_o[1:0] == 2'b10);
      wb_sel_o[1] <= #1 (cmd[1:0] == 2'b11) & (wb_adr_o[1:0] == 2'b00) | (cmd[1] ^ cmd[0]) & (wb_adr_o[1:0] == 2'b10);
      wb_sel_o[2] <= #1 (cmd[1]) & (wb_adr_o[1:0] == 2'b00) | (cmd[1:0] == 2'b01) & (wb_adr_o[1:0] == 2'b01);
      wb_sel_o[3] <= #1 (wb_adr_o[1:0] == 2'b00);
    end
  else                                            // read
    begin
      wb_sel_o[0] <= #1 (read_type[1:0] == 2'b11) & (wb_adr_o[1:0] == 2'b00) | (read_type[1:0] == 2'b01) & (wb_adr_o[1:0] == 2'b11) |
                        (read_type[1:0] == 2'b10) & (wb_adr_o[1:0] == 2'b10);
      wb_sel_o[1] <= #1 (read_type[1:0] == 2'b11) & (wb_adr_o[1:0] == 2'b00) | (read_type[1] ^ read_type[0]) & (wb_adr_o[1:0] == 2'b10);
      wb_sel_o[2] <= #1 (read_type[1]) & (wb_adr_o[1:0] == 2'b00) | (read_type[1:0] == 2'b01) & (wb_adr_o[1:0] == 2'b01);
      wb_sel_o[3] <= #1 (wb_adr_o[1:0] == 2'b00);
    end
end
 
 
assign wb_we_o = cmd_write & dr_go_latched;
assign wb_cab_o = 1'b0;
assign wb_stb_o = wb_cyc_o;
assign wb_cti_o = 3'h0;     // always performing single access
assign wb_bte_o = 2'h0;     // always performing single access
 
 
always @ (posedge wb_clk_i or posedge wb_rst_i)
begin
  if (wb_rst_i)
    wb_end <= #1 1'b0;
  else if (wb_ack_i | wb_err_i)
    wb_end <= #1 1'b1;
  else if (wb_end_rst)
    wb_end <= #1 1'b0;
end
 
 
always @ (posedge tck_i or posedge trst_i)
begin
  if (trst_i)
    begin
      wb_end_sync <= #1 1'b0;
      wb_end_tck  <= #1 1'b0;
      wb_end_tck_q<= #1 1'b0;
    end
  else
    begin
      wb_end_sync <= #1 wb_end;
      wb_end_tck  <= #1 wb_end_sync;
      wb_end_tck_q<= #1 wb_end_tck;
    end
end
 
 
always @ (posedge wb_clk_i or posedge wb_rst_i)
begin
  if (wb_rst_i)
    busy_wb <= #1 1'b0;
  else if (wb_end_rst)
    busy_wb <= #1 1'b0;
  else if (wb_cyc_o)
    busy_wb <= #1 1'b1;
end
 
 
always @ (posedge tck_i or posedge trst_i)
begin
  if (trst_i)
    begin
      busy_sync <= #1 1'b0;
      busy_tck <= #1 1'b0;
    end
  else
    begin
      busy_sync <= #1 busy_wb;
      busy_tck <= #1 busy_sync;
    end
end
 
 
always @ (posedge wb_clk_i)
begin
  wb_end_rst_sync <= #1 wb_end_tck;
  wb_end_rst  <= #1 wb_end_rst_sync;
end
 
 
always @ (posedge wb_clk_i or posedge wb_rst_i)
begin
  if (wb_rst_i)
    wb_error <= #1 1'b0;
  else if(wb_err_i)
    wb_error <= #1 1'b1;
  else if(wb_ack_i & status_reset_en) // error remains active until STATUS read is performed
    wb_error <= #1 1'b0;
end
 
always @ (posedge tck_i)
begin
  wb_error_sync <= #1 wb_error;
  wb_error_tck  <= #1 wb_error_sync;
end
 
 
 
always @ (posedge wb_clk_i or posedge wb_rst_i)
begin
  if (wb_rst_i)
    wb_overrun <= #1 1'b0;
  else if(start_wb_wr & (~start_wb_wr_q) & wb_cyc_o)
    wb_overrun <= #1 1'b1;
  else if((wb_ack_i | wb_err_i) & status_reset_en) // error remains active until STATUS read is performed
    wb_overrun <= #1 1'b0;
end
 
always @ (posedge tck_i)
begin
  wb_overrun_sync <= #1 wb_overrun;
  wb_overrun_tck  <= #1 wb_overrun_sync;
end
 
 
 
 
 
 
// wb_error is locked until WB_STATUS is performed
always @ (posedge tck_i or posedge trst_i)
begin
  if (trst_i)
    status_reset_en <= 1'b0;
  else if((cmd_old == `WB_STATUS) & (cmd !== `WB_STATUS))
    status_reset_en <= #1 1'b1;
  else
    status_reset_en <= #1 1'b0;
end
 
/*
to gre ven
always @ (posedge wb_clk_i)
begin
  if (set_addr_wb & (~set_addr_wb_q)) // Setting starting address
    wb_adr_o <= #1 adr;
  else if (wb_ack_i)
    begin
      if (read_type == `WB_READ8)
        wb_adr_o <= #1 wb_adr_o + 1'd1;
      else if (read_type == `WB_READ16)
        wb_adr_o <= #1 wb_adr_o + 2'd2;
      else
        wb_adr_o <= #1 wb_adr_o + 3'd4;
    end
end
*/
reg [7:0] mem [0:3];
reg [2:0] mem_ptr;
reg wishbone_ce_sync;
reg wishbone_ce_rst;
 
always @ (posedge wb_clk_i)
begin
  wishbone_ce_sync <= #1  wishbone_ce_i;
  wishbone_ce_rst  <= #1 ~wishbone_ce_sync;
end
 
 
always @ (posedge wb_clk_i)
begin
  if(wishbone_ce_rst)
    mem_ptr <= #1 'h0;
  else if (wb_ack_i)
    begin
      if (read_type == `WB_READ8)
        mem_ptr <= #1 mem_ptr + 1'd1;
      else if (read_type == `WB_READ16)
        mem_ptr <= #1 mem_ptr + 2'd2;
    end
end
 
 
always @ (posedge wb_clk_i)
begin
  if (wb_ack_i)
    begin
      case (wb_sel_o)    // synthesis parallel_case full_case 
        4'b1000  :  mem[mem_ptr[1:0]] <= #1 wb_dat_i[31:24];            // byte 
        4'b0100  :  mem[mem_ptr[1:0]] <= #1 wb_dat_i[23:16];            // byte
        4'b0010  :  mem[mem_ptr[1:0]] <= #1 wb_dat_i[15:08];            // byte
        4'b0001  :  mem[mem_ptr[1:0]] <= #1 wb_dat_i[07:00];            // byte
 
        4'b1100  :                                                      // half
                    begin
                      mem[mem_ptr[1:0]]      <= #1 wb_dat_i[31:24];
                      mem[mem_ptr[1:0]+1'b1] <= #1 wb_dat_i[23:16];
                    end
        4'b0011  :                                                      // half
                    begin
                      mem[mem_ptr[1:0]]      <= #1 wb_dat_i[15:08];
                      mem[mem_ptr[1:0]+1'b1] <= #1 wb_dat_i[07:00];
                    end
        4'b1111  :                                                      // long
                    begin
                      mem[0] <= #1 wb_dat_i[31:24];
                      mem[1] <= #1 wb_dat_i[23:16];
                      mem[2] <= #1 wb_dat_i[15:08];
                      mem[3] <= #1 wb_dat_i[07:00];
                    end
      endcase
    end
end
 
assign input_data = {mem[0], mem[1], mem[2], mem[3]};
 
 
 
 
 
 
 
endmodule
 

Line No.	Rev	Author	Line
1	82	mohor	`//////////////////////////////////////////////////////////////////////`
2			`//// ////`
3			`//// dbg_wb.v ////`
4			`//// ////`
5			`//// ////`
6			`//// This file is part of the SoC/OpenRISC Development Interface ////`
7			`//// http://www.opencores.org/projects/DebugInterface/ ////`
8			`//// ////`
9			`//// Author(s): ////`
10			`//// Igor Mohor (igorm@opencores.org) ////`
11			`//// ////`
12			`//// ////`
13			`//// All additional information is avaliable in the README.txt ////`
14			`//// file. ////`
15			`//// ////`
16			`//////////////////////////////////////////////////////////////////////`
17			`//// ////`
18			`//// Copyright (C) 2000 - 2003 Authors ////`
19			`//// ////`
20			`//// This source file may be used and distributed without ////`
21			`//// restriction provided that this copyright statement is not ////`
22			`//// removed from the file and that any derivative work contains ////`
23			`//// the original copyright notice and the associated disclaimer. ////`
24			`//// ////`
25			`//// This source file is free software; you can redistribute it ////`
26			`//// and/or modify it under the terms of the GNU Lesser General ////`
27			`//// Public License as published by the Free Software Foundation; ////`
28			`//// either version 2.1 of the License, or (at your option) any ////`
29			`//// later version. ////`
30			`//// ////`
31			`//// This source is distributed in the hope that it will be ////`
32			`//// useful, but WITHOUT ANY WARRANTY; without even the implied ////`
33			`//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////`
34			`//// PURPOSE. See the GNU Lesser General Public License for more ////`
35			`//// details. ////`
36			`//// ////`
37			`//// You should have received a copy of the GNU Lesser General ////`
38			`//// Public License along with this source; if not, download it ////`
39			`//// from http://www.opencores.org/lgpl.shtml ////`
40			`//// ////`
41			`//////////////////////////////////////////////////////////////////////`
42			`//`
43			`// CVS Revision History`
44			`//`
45			`// $Log: not supported by cvs2svn $`
46	94	mohor	`// Revision 1.10 2004/01/13 11:28:14 mohor`
47			`// tmp version.`
48			`//`
49	93	mohor	`// Revision 1.9 2004/01/10 07:50:24 mohor`
50			`// temp version.`
51			`//`
52	92	mohor	`// Revision 1.8 2004/01/09 12:48:44 mohor`
53			`// tmp version.`
54			`//`
55	91	mohor	`// Revision 1.7 2004/01/08 17:53:36 mohor`
56			`// tmp version.`
57			`//`
58	90	mohor	`// Revision 1.6 2004/01/07 11:58:56 mohor`
59			`// temp4 version.`
60			`//`
61	89	mohor	`// Revision 1.5 2004/01/06 17:15:19 mohor`
62			`// temp3 version.`
63			`//`
64	88	mohor	`// Revision 1.4 2004/01/05 12:16:00 mohor`
65			`// tmp2 version.`
66			`//`
67	87	mohor	`// Revision 1.3 2003/12/23 16:22:46 mohor`
68			`// Tmp version.`
69			`//`
70	86	mohor	`// Revision 1.2 2003/12/23 15:26:26 mohor`
71			`// Small fix.`
72			`//`
73	83	mohor	`// Revision 1.1 2003/12/23 15:09:04 mohor`
74			`// New directory structure. New version of the debug interface.`
75	82	mohor	`//`
76			`//`
77	83	mohor	`//`
78	82	mohor
79			`// synopsys translate_off`
80			`include "timescale.v"
81			`// synopsys translate_on`
82			`include "dbg_wb_defines.v"
83
84			`// Top module`
85			`module dbg_wb(`
86			`// JTAG signals`
87			`trst_i, // trst_i is active high (inverted on higher layers)`
88			`tck_i,`
89			`tdi_i,`
90			`tdo_o,`
91
92			`// TAP states`
93			`shift_dr_i,`
94			`pause_dr_i,`
95			`update_dr_i,`
96
97			`wishbone_ce_i,`
98			`crc_match_i,`
99			`crc_en_o,`
100			`shift_crc_o,`
101
102			`// WISHBONE common signals`
103			`wb_rst_i, wb_clk_i,`
104
105			`// WISHBONE master interface`
106			`wb_adr_o, wb_dat_o, wb_dat_i, wb_cyc_o, wb_stb_o, wb_sel_o,`
107			`wb_we_o, wb_ack_i, wb_cab_o, wb_err_i, wb_cti_o, wb_bte_o`
108
109			`);`
110
111			`// JTAG signals`
112			`input trst_i;`
113			`input tck_i;`
114			`input tdi_i;`
115			`output tdo_o;`
116
117			`// TAP states`
118			`input shift_dr_i;`
119			`input pause_dr_i;`
120			`input update_dr_i;`
121
122			`input wishbone_ce_i;`
123			`input crc_match_i;`
124			`output crc_en_o;`
125			`output shift_crc_o;`
126
127			`// WISHBONE common signals`
128			`input wb_rst_i; // WISHBONE reset`
129			`input wb_clk_i; // WISHBONE clock`
130
131			`// WISHBONE master interface`
132			`output [31:0] wb_adr_o;`
133			`output [31:0] wb_dat_o;`
134			`input [31:0] wb_dat_i;`
135			`output wb_cyc_o;`
136			`output wb_stb_o;`
137			`output [3:0] wb_sel_o;`
138			`output wb_we_o;`
139			`input wb_ack_i;`
140			`output wb_cab_o;`
141			`input wb_err_i;`
142			`output [2:0] wb_cti_o;`
143			`output [1:0] wb_bte_o;`
144
145			`reg wb_cyc_o;`
146			`reg [31:0] wb_adr_o;`
147	88	mohor	`reg [31:0] wb_dat_o;`
148	82	mohor	`reg [3:0] wb_sel_o;`
149
150			`reg tdo_o;`
151
152	88	mohor	`reg [50:0] dr;`
153			`wire enable;`
154	90	mohor	`wire cmd_cnt_en;`
155	88	mohor	`reg [1:0] cmd_cnt;`
156			`wire cmd_cnt_end;`
157			`reg cmd_cnt_end_q;`
158	90	mohor	`wire addr_len_cnt_en;`
159	88	mohor	`reg [5:0] addr_len_cnt;`
160			`reg [5:0] addr_len_cnt_limit;`
161			`wire addr_len_cnt_end;`
162	90	mohor	`wire crc_cnt_en;`
163	88	mohor	`reg [5:0] crc_cnt;`
164			`wire crc_cnt_end;`
165			`reg crc_cnt_end_q;`
166	90	mohor	`wire data_cnt_en;`
167	88	mohor	`reg [18:0] data_cnt;`
168			`reg [18:0] data_cnt_limit;`
169			`wire data_cnt_end;`
170	90	mohor	`reg data_cnt_end_q;`
171	88	mohor	`reg status_reset_en;`
172	82	mohor
173	90	mohor	`reg crc_match_reg;`
174	82	mohor
175	92	mohor	`reg [2:0] cmd, cmd_old, dr_cmd_latched;`
176			`reg [31:0] adr;`
177			`reg [15:0] len;`
178			`reg start_rd_tck;`
179			`reg start_rd_sync1;`
180			`reg start_wb_rd;`
181			`reg start_wb_rd_q;`
182			`reg start_wr_tck;`
183			`reg start_wr_sync1;`
184			`reg start_wb_wr;`
185			`reg start_wb_wr_q;`
186	88	mohor
187	92	mohor	`wire dr_read;`
188			`wire dr_write;`
189			`wire dr_go;`
190	88	mohor
191	92	mohor	`reg dr_write_latched;`
192			`reg dr_read_latched;`
193			`reg dr_go_latched;`
194	82	mohor
195	92	mohor	`wire status_cnt_end;`
196	89	mohor
197	92	mohor	`wire byte, half, long;`
198			`reg byte_q, half_q, long_q;`
199	94	mohor	`reg byte_q2, half_q2, long_q2;`
200	92	mohor	`reg cmd_read;`
201			`reg cmd_write;`
202			`reg cmd_go;`
203			`//reg cmd_old_read;`
204	90	mohor
205	92	mohor	`reg status_cnt1, status_cnt2, status_cnt3, status_cnt4;`
206	90	mohor
207	92	mohor	reg [`STATUS_LEN -1:0] status;
208
209			`reg wb_error, wb_error_sync, wb_error_tck;`
210			`reg wb_overrun, wb_overrun_sync, wb_overrun_tck;`
211
212			`reg busy_wb;`
213			`reg busy_tck;`
214			`reg wb_end;`
215			`reg wb_end_rst;`
216			`reg wb_end_rst_sync;`
217			`reg wb_end_sync;`
218	93	mohor	`reg wb_end_tck, wb_end_tck_q;`
219	92	mohor	`reg busy_sync;`
220			`reg [799:0] TDO_WISHBONE;`
221			`reg [399:0] latching_data;`
222
223			`reg set_addr, set_addr_sync, set_addr_wb, set_addr_wb_q;`
224			`reg read_cycle;`
225	94	mohor	`reg write_cycle;`
226	92	mohor	`reg [2:0] read_type;`
227			`wire [31:0] input_data;`
228
229	93	mohor	`wire len_eq_0;`
230			`wire crc_cnt_31;`
231
232	82	mohor	`assign enable = wishbone_ce_i & shift_dr_i;`
233	90	mohor	`assign crc_en_o = enable & crc_cnt_end & (~status_cnt_end);`
234	89	mohor	`assign shift_crc_o = enable & status_cnt_end; // Signals dbg module to shift out the CRC`
235	82	mohor
236	93	mohor	`reg [1:0] ptr;`
237	82	mohor
238	90	mohor	`//always @ (posedge tck_i)`
239			`//begin`
240			`// if (enable & ((~addr_len_cnt_end) \| (~cmd_cnt_end) \| (~data_cnt_end)))`
241			`// dr <= #1 {dr[49:0], tdi_i};`
242			`//end`
243
244	82	mohor	`always @ (posedge tck_i)`
245			`begin`
246	93	mohor	`if (update_dr_i)`
247			`ptr <= #1 2'h0;`
248			`else if (read_cycle & dr_go_latched & crc_cnt_31) // first latch`
249			`ptr <= #1 ptr + 1'b1;`
250			`else if (read_cycle & cmd_go & byte & (~byte_q))`
251			`ptr <= ptr + 1'd1;`
252			`end`
253
254
255
256			`always @ (posedge tck_i)`
257			`begin`
258			`if (read_cycle & dr_go_latched & crc_cnt_31)`
259	90	mohor	`begin`
260	93	mohor	`dr[31:0] <= #1 input_data[31:0];`
261			`latching_data = "First latch";`
262			`end`
263			`else if (read_cycle & crc_cnt_end)`
264			`begin`
265	92	mohor	`case (read_type) // synthesis parallel_case full_case`
266	90	mohor	`WB_READ8 : begin
267			`if(byte & (~byte_q))`
268	92	mohor	`begin`
269	93	mohor	`case (ptr) // synthesis parallel_case`
270			`2'b00 : dr[31:24] <= #1 input_data[31:24];`
271			`2'b01 : dr[31:24] <= #1 input_data[23:16];`
272			`2'b10 : dr[31:24] <= #1 input_data[15:8];`
273			`2'b11 : dr[31:24] <= #1 input_data[7:0];`
274			`endcase`
275			`latching_data = "8 bit latched";`
276	92	mohor	`end`
277	90	mohor	`else`
278	92	mohor	`begin`
279	93	mohor	`dr[31:24] <= #1 {dr[30:24], 1'b0};`
280			`latching_data = "8 bit shifted";`
281	92	mohor	`end`
282	90	mohor	`end`
283			`WB_READ16: begin
284			`if(half & (~half_q))`
285	92	mohor	`begin`
286	93	mohor	`if (ptr[1])`
287			`dr[31:16] <= #1 input_data[31:16];`
288			`else`
289			`dr[31:16] <= #1 input_data[15:0];`
290			`latching_data = "16 bit latched";`
291	92	mohor	`end`
292	90	mohor	`else`
293	92	mohor	`begin`
294	93	mohor	`dr[31:16] <= #1 {dr[30:16], 1'b0};`
295			`latching_data = "16 bit shifted";`
296	92	mohor	`end`
297	90	mohor	`end`
298			`WB_READ32: begin
299			`if(long & (~long_q))`
300	92	mohor	`begin`
301	93	mohor	`dr[31:0] <= #1 input_data[31:0];`
302			`latching_data = "32 bit latched";`
303	92	mohor	`end`
304	90	mohor	`else`
305	92	mohor	`begin`
306	93	mohor	`dr[31:0] <= #1 {dr[30:0], 1'b0};`
307			`latching_data = "32 bit shifted";`
308	92	mohor	`end`
309	90	mohor	`end`
310			`endcase`
311			`end`
312	94	mohor	`// else if (enable & ((~addr_len_cnt_end) \| (~cmd_cnt_end) \| (~data_cnt_end)))`
313			`else if (enable & ((~addr_len_cnt_end) \| (~cmd_cnt_end) \| ((~data_cnt_end) & write_cycle)))`
314	92	mohor	`begin`
315	88	mohor	`dr <= #1 {dr[49:0], tdi_i};`
316	92	mohor	`latching_data = "tdi shifted in";`
317			`end`
318	94	mohor	`else`
319			`latching_data = "nothing";`
320	82	mohor	`end`
321
322
323	90	mohor	`assign cmd_cnt_en = enable & (~cmd_cnt_end);`
324	88	mohor
325	82	mohor	`always @ (posedge tck_i or posedge trst_i)`
326			`begin`
327			`if (trst_i)`
328	87	mohor	`cmd_cnt <= #1 'h0;`
329	82	mohor	`else if (update_dr_i)`
330	87	mohor	`cmd_cnt <= #1 'h0;`
331	90	mohor	`else if (cmd_cnt_en)`
332	87	mohor	`cmd_cnt <= #1 cmd_cnt + 1'b1;`
333	82	mohor	`end`
334
335
336	90	mohor	`assign addr_len_cnt_en = enable & cmd_cnt_end & (~addr_len_cnt_end);`
337
338	87	mohor	`always @ (posedge tck_i or posedge trst_i)`
339			`begin`
340			`if (trst_i)`
341	88	mohor	`addr_len_cnt <= #1 'h0;`
342			`else if (update_dr_i)`
343			`addr_len_cnt <= #1 'h0;`
344	90	mohor	`else if (addr_len_cnt_en)`
345	88	mohor	`addr_len_cnt <= #1 addr_len_cnt + 1'b1;`
346			`end`
347
348
349	90	mohor	`assign data_cnt_en = enable & cmd_cnt_end & (~data_cnt_end);`
350
351	88	mohor	`always @ (posedge tck_i or posedge trst_i)`
352			`begin`
353			`if (trst_i)`
354	87	mohor	`data_cnt <= #1 'h0;`
355			`else if (update_dr_i)`
356			`data_cnt <= #1 'h0;`
357	93	mohor	`// else if (crc_cnt_31 & dr_go_latched & cmd_read)`
358			`// data_cnt <= #1 'h1;`
359	90	mohor	`else if (data_cnt_en)`
360	87	mohor	`data_cnt <= #1 data_cnt + 1'b1;`
361			`end`
362	82	mohor
363	87	mohor
364	88	mohor
365	93	mohor	`assign byte = data_cnt[2:0] == 3'd7;`
366			`assign half = data_cnt[3:0] == 4'd15;`
367			`assign long = data_cnt[4:0] == 5'd31;`
368	88	mohor
369
370			`always @ (posedge tck_i)`
371			`begin`
372	92	mohor	`// if (crc_cnt == 6'd31) // Reset to zero after crc to load first data byte. igor !!! This is probably not necessary`
373			`// begin`
374			`// byte_q <= #1 1'b0;`
375			`// half_q <= #1 1'b0;`
376			`// long_q <= #1 1'b0;`
377			`// end`
378			`// else`
379			`// begin`
380			`byte_q <= #1 byte;`
381			`half_q <= #1 half;`
382			`long_q <= #1 long;`
383	94	mohor	`byte_q2 <= #1 byte_q;`
384			`half_q2 <= #1 half_q;`
385			`long_q2 <= #1 long_q;`
386	92	mohor	`// end`
387	88	mohor	`end`
388
389
390
391	91	mohor	//assign cmd_read = (cmd == `WB_READ8) \| (cmd == `WB_READ16) \| (cmd == `WB_READ32);
392			//assign cmd_write = (cmd == `WB_WRITE8) \| (cmd == `WB_WRITE16) \| (cmd == `WB_WRITE32);
393			//assign cmd_go = cmd == `WB_GO;
394			//assign cmd_old_read = (cmd_old == `WB_READ8) \| (cmd_old == `WB_READ16) \| (cmd_old == `WB_READ32);
395	88	mohor
396	90	mohor
397	89	mohor	assign dr_read = (dr[2:0] == `WB_READ8) \| (dr[2:0] == `WB_READ16) \| (dr[2:0] == `WB_READ32);
398			assign dr_write = (dr[2:0] == `WB_WRITE8) \| (dr[2:0] == `WB_WRITE16) \| (dr[2:0] == `WB_WRITE32);
399			assign dr_go = dr[2:0] == `WB_GO;
400	88	mohor
401
402			`always @ (posedge tck_i)`
403			`begin`
404			`if (update_dr_i)`
405	91	mohor	`begin`
406			`dr_cmd_latched = 3'h0;`
407			`dr_read_latched <= #1 1'b0;`
408			`dr_write_latched <= #1 1'b0;`
409			`dr_go_latched <= #1 1'b0;`
410			`end`
411	88	mohor	`else if (cmd_cnt_end & (~cmd_cnt_end_q))`
412	91	mohor	`begin`
413			`dr_cmd_latched = dr[2:0];`
414			`dr_read_latched <= #1 dr_read;`
415			`dr_write_latched <= #1 dr_write;`
416			`dr_go_latched <= #1 dr_go;`
417			`end`
418	88	mohor	`end`
419
420
421			`always @ (posedge tck_i)`
422			`begin`
423	90	mohor	`if (cmd_cnt == 2'h2)`
424	88	mohor	`begin`
425	90	mohor	`if ((~dr[0]) & (~tdi_i)) // (current command is WB_STATUS or WB_GO)`
426	88	mohor	`addr_len_cnt_limit = 6'd0;`
427	90	mohor	`else // (current command is WB_WRITEx or WB_READx)`
428	88	mohor	`addr_len_cnt_limit = 6'd48;`
429			`end`
430			`end`
431
432
433	94	mohor	`wire go_prelim;`
434
435			`assign go_prelim = (cmd_cnt == 2'h2) & dr[1] & (~dr[0]) & (~tdi_i);`
436
437			`/*`
438	90	mohor	`always @ (posedge tck_i)`
439	88	mohor	`begin`
440	92	mohor	`if (update_dr_i)`
441			`data_cnt_limit = 19'h0;`
442	94	mohor	`// else if (((cmd_cnt == 2'h2) & dr[1] & (~dr[0]) & (~tdi_i) & cmd_write) \| // current command is WB_GO and previous command is WB_WRITEx)`
443			`else if ( go_prelim & cmd_write \| // current command is WB_GO and previous command is WB_WRITEx)`
444			`crc_cnt_31 & dr_go_latched & cmd_read // current command is WB_GO and previous command is WB_READx)`
445	92	mohor	`)`
446			`data_cnt_limit = {len, 3'b000};`
447	88	mohor	`end`
448	94	mohor	`*/`
449	88	mohor
450	94	mohor	`always @ (posedge tck_i)`
451			`begin`
452			`if (update_dr_i)`
453			`data_cnt_limit = {len, 3'b000};`
454			`end`
455	88	mohor
456	90	mohor
457	94	mohor	`//assign crc_cnt_en = enable & cmd_cnt_end & addr_len_cnt_end & data_cnt_end & (~crc_cnt_end);`
458			`assign crc_cnt_en = enable & (~crc_cnt_end) & (cmd_cnt_end & addr_len_cnt_end & (~write_cycle) \| (data_cnt_end & write_cycle));`
459
460	82	mohor	`// crc counter`
461			`always @ (posedge tck_i or posedge trst_i)`
462			`begin`
463			`if (trst_i)`
464			`crc_cnt <= #1 'h0;`
465	90	mohor	`else if(crc_cnt_en)`
466	82	mohor	`crc_cnt <= #1 crc_cnt + 1'b1;`
467			`else if (update_dr_i)`
468			`crc_cnt <= #1 'h0;`
469			`end`
470
471	87	mohor	`assign cmd_cnt_end = cmd_cnt == 2'h3;`
472	88	mohor	`assign addr_len_cnt_end = addr_len_cnt == addr_len_cnt_limit;`
473	87	mohor	`assign crc_cnt_end = crc_cnt == 6'd32;`
474	93	mohor	`assign crc_cnt_31 = crc_cnt == 6'd31;`
475	89	mohor	`assign data_cnt_end = (data_cnt == data_cnt_limit);`
476	82	mohor
477			`always @ (posedge tck_i)`
478			`begin`
479	90	mohor	`crc_cnt_end_q <= #1 crc_cnt_end;`
480			`cmd_cnt_end_q <= #1 cmd_cnt_end;`
481			`data_cnt_end_q <= #1 data_cnt_end;`
482	82	mohor	`end`
483
484	90	mohor
485
486	82	mohor	`always @ (posedge tck_i or posedge trst_i)`
487			`begin`
488			`if (trst_i)`
489	90	mohor	`status_cnt1 <= #1 1'b0;`
490	82	mohor	`else if (update_dr_i)`
491	90	mohor	`status_cnt1 <= #1 1'b0;`
492	94	mohor	`// else if (data_cnt_end & (~data_cnt_end_q) & read_cycle \|`
493			`// crc_cnt_end & (~crc_cnt_end_q) & (~(cmd_read & dr_go_latched)) // cmd is not changed, yet.`
494			`// )`
495			`else if (data_cnt_end & read_cycle \|`
496			`crc_cnt_end & (~(cmd_read & dr_go_latched)) // cmd is not changed, yet.`
497	90	mohor	`)`
498			`status_cnt1 <= #1 1'b1;`
499	82	mohor	`end`
500

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