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//////////////////////////////////////////////////////////////////////
////                                                              ////
////  dbg_wb.v                                                    ////
////                                                              ////
////                                                              ////
////  This file is part of the SoC Debug 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 - 2004 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 1.19  2004/03/22 16:35:46  igorm
// Temp version before changing dbg interface.
//
// Revision 1.18  2004/01/25 14:04:18  mohor
// All flipflops are reset.
//
// Revision 1.17  2004/01/22 13:58:53  mohor
// Port signals are all set to zero after reset.
//
// Revision 1.16  2004/01/19 07:32:41  simons
// Reset values width added because of FV, a good sentence changed because some tools can not handle it.
//
// Revision 1.15  2004/01/17 18:01:24  mohor
// New version.
//
// Revision 1.14  2004/01/16 14:51:33  mohor
// cpu registers added.
//
// Revision 1.13  2004/01/15 12:09:43  mohor
// Working.
//
// Revision 1.12  2004/01/14 22:59:18  mohor
// Temp version.
//
// Revision 1.11  2004/01/14 12:29:40  mohor
// temp version. Resets will be changed in next version.
//
// 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
                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,
                rst_i,
 
                // WISHBONE common signals
                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         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;
input         rst_i;
// WISHBONE common signals
input         wb_clk_i;
 
// 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           tdo_o;
 
reg    [31:0] wb_dat_tmp, wb_dat_dsff;
reg    [31:0] wb_adr_dsff;
reg     [3:0] wb_sel_dsff;
reg           wb_we_dsff;
reg    [`DBG_WB_DR_LEN -1 :0] dr;
wire          enable;
wire          cmd_cnt_en;
reg     [`DBG_WB_CMD_CNT_WIDTH -1:0] cmd_cnt;
wire          cmd_cnt_end;
reg           cmd_cnt_end_q;
reg           addr_len_cnt_en;
reg     [5:0] addr_len_cnt;
wire          addr_len_cnt_end;
reg           addr_len_cnt_end_q;
reg           crc_cnt_en;
reg     [`DBG_WB_CRC_CNT_WIDTH -1:0] crc_cnt;
wire          crc_cnt_end;
reg           crc_cnt_end_q;
reg           data_cnt_en;
reg    [`DBG_WB_DATA_CNT_WIDTH:0] data_cnt;
reg    [`DBG_WB_DATA_CNT_WIDTH:0] data_cnt_limit;
wire          data_cnt_end;
reg           data_cnt_end_q;
 
reg           crc_match_reg;
 
reg    [`DBG_WB_ACC_TYPE_LEN -1:0] acc_type;
reg    [`DBG_WB_ADR_LEN -1:0] adr;
reg    [`DBG_WB_LEN_LEN -1:0] len;
reg    [`DBG_WB_LEN_LEN:0]    len_var;
reg           start_rd_tck;
reg           rd_tck_started;
reg           start_rd_csff;
reg           start_wb_rd;
reg           start_wb_rd_q;
reg           start_wr_tck;
reg           start_wr_csff;
reg           start_wb_wr;
reg           start_wb_wr_q;
 
reg           status_cnt_en;
wire          status_cnt_end;
 
wire          byte, half, long;
reg           byte_q, half_q, long_q;
 
reg [`DBG_WB_STATUS_CNT_WIDTH -1:0] status_cnt;
 
reg [`DBG_WB_STATUS_LEN -1:0] status;
 
reg           wb_error, wb_error_csff, wb_error_tck;
reg           wb_overrun, wb_overrun_csff, wb_overrun_tck;
reg           underrun_tck;
 
reg           busy_wb;
reg           busy_tck;
reg           wb_end;
reg           wb_end_rst;
reg           wb_end_rst_csff;
reg           wb_end_csff;
reg           wb_end_tck, wb_end_tck_q;
reg           busy_csff;
reg           latch_data;
reg           update_dr_csff, update_dr_wb;
 
reg           set_addr, set_addr_csff, set_addr_wb, set_addr_wb_q;
wire   [31:0] input_data;
 
wire          len_eq_0;
wire          crc_cnt_31;
 
reg     [1:0] ptr;
reg     [2:0] fifo_cnt;
wire          fifo_full;
wire          fifo_empty;
reg     [7:0] mem [0:3];
reg     [2:0] mem_ptr_dsff;
reg           wishbone_ce_csff;
reg           mem_ptr_init;
reg [`DBG_WB_CMD_LEN -1: 0] curr_cmd;
wire          curr_cmd_go;
reg           curr_cmd_go_q;
wire          curr_cmd_wr_comm;
wire          curr_cmd_rd_comm;
wire          acc_type_read;
wire          acc_type_write;
wire          acc_type_8bit;
wire          acc_type_16bit;
wire          acc_type_32bit;
 
 
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
 
assign curr_cmd_go      = (curr_cmd == `DBG_WB_GO) && cmd_cnt_end;
assign curr_cmd_wr_comm = (curr_cmd == `DBG_WB_WR_COMM) && cmd_cnt_end;
assign curr_cmd_rd_comm = (curr_cmd == `DBG_WB_RD_COMM) && cmd_cnt_end;
 
assign acc_type_read    = (acc_type == `DBG_WB_READ8  || acc_type == `DBG_WB_READ16  || acc_type == `DBG_WB_READ32);
assign acc_type_write   = (acc_type == `DBG_WB_WRITE8 || acc_type == `DBG_WB_WRITE16 || acc_type == `DBG_WB_WRITE32);
 
assign acc_type_8bit    = (acc_type == `DBG_WB_READ8  || acc_type == `DBG_WB_WRITE8);
assign acc_type_16bit   = (acc_type == `DBG_WB_READ16 || acc_type == `DBG_WB_WRITE16);
assign acc_type_32bit   = (acc_type == `DBG_WB_READ32 || acc_type == `DBG_WB_WRITE32);
 
 
// Selecting where to take the data from
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    ptr <= #1 2'h0;
  else if (update_dr_i)
    ptr <= #1 2'h0;
  else if (curr_cmd_go && acc_type_read && crc_cnt_31) // first latch
    ptr <= #1 ptr + 1'b1;
  else if (curr_cmd_go && acc_type_read && byte && (!byte_q))
    ptr <= ptr + 1'd1;
end
 
 
reg [799:0] dr_text;
// Shift register for shifting in and out the data
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    begin
      latch_data <= #1 1'b0;
      dr <= #1 {`DBG_WB_DR_LEN{1'b0}};
      dr_text = "reset";
    end
  else if (curr_cmd_rd_comm && crc_cnt_31)  // Latching data (from iternal regs)
    begin
      dr[`DBG_WB_ACC_TYPE_LEN + `DBG_WB_ADR_LEN + `DBG_WB_LEN_LEN -1:0] <= #1 {acc_type, adr, len};
      dr_text = "latch reg data";
    end
  else if (acc_type_read && curr_cmd_go && crc_cnt_31)  // Latchind first data (from WB)
    begin
      dr[31:0] <= #1 input_data[31:0];
      latch_data <= #1 1'b1;
      dr_text = "latch first data";
    end
  else if (acc_type_read && curr_cmd_go && crc_cnt_end) // Latching data (from WB)
    begin
      case (acc_type)  // synthesis parallel_case full_case
        `DBG_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
                          latch_data <= #1 1'b1;
                          dr_text = "latch_data byte";
                        end
                      else
                        begin
                          dr[31:24] <= #1 {dr[30:24], 1'b0};
                          latch_data <= #1 1'b0;
                          dr_text = "shift byte";
                        end
                    end
        `DBG_WB_READ16: begin
                      if(half & (~half_q))
                        begin
                          if (ptr[1])
                            dr[31:16] <= #1 input_data[15:0];
                          else
                            dr[31:16] <= #1 input_data[31:16];
                          latch_data <= #1 1'b1;
                          dr_text = "latch_data_half";
                        end
                      else
                        begin
                          dr[31:16] <= #1 {dr[30:16], 1'b0};
                          latch_data <= #1 1'b0;
                          dr_text = "shift half";
                        end
                    end
        `DBG_WB_READ32: begin
                      if(long & (~long_q))
                        begin
                          dr[31:0] <= #1 input_data[31:0];
                          latch_data <= #1 1'b1;
                          dr_text = "latch_data word";
                        end
                      else
                        begin
                          dr[31:0] <= #1 {dr[30:0], 1'b0};
                          latch_data <= #1 1'b0;
                          dr_text = "shift word";
                        end
                    end
      endcase
    end
  else if (enable && (!addr_len_cnt_end))
    begin
      dr <= #1 {dr[`DBG_WB_DR_LEN -2:0], tdi_i};
      dr_text = "shift dr";
    end
end
 
 
 
assign cmd_cnt_en = enable & (~cmd_cnt_end);
 
 
// Command counter
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    cmd_cnt <= #1 {`DBG_WB_CMD_CNT_WIDTH{1'b0}};
  else if (update_dr_i)
    cmd_cnt <= #1 {`DBG_WB_CMD_CNT_WIDTH{1'b0}};
  else if (cmd_cnt_en)
    cmd_cnt <= #1 cmd_cnt + 1'b1;
end
 
 
// Assigning current command
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    curr_cmd <= #1 {`DBG_WB_CMD_LEN{1'b0}};
  else if (update_dr_i)
    curr_cmd <= #1 {`DBG_WB_CMD_LEN{1'b0}};
  else if (cmd_cnt == (`DBG_WB_CMD_LEN -1))
    curr_cmd <= #1 {dr[`DBG_WB_CMD_LEN-2 :0], tdi_i};
end
 
 
// Assigning current command
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    curr_cmd_go_q <= #1 1'b0;
  else
    curr_cmd_go_q <= #1 curr_cmd_go;
end
 
 
always @ (enable or cmd_cnt_end or addr_len_cnt_end or curr_cmd_wr_comm or curr_cmd_rd_comm or crc_cnt_end)
begin
  if (enable && (!addr_len_cnt_end))
    begin
      if (cmd_cnt_end && curr_cmd_wr_comm)
        addr_len_cnt_en = 1'b1;
      else if (crc_cnt_end && curr_cmd_rd_comm)
        addr_len_cnt_en = 1'b1;
      else
        addr_len_cnt_en = 1'b0;
    end
  else
    addr_len_cnt_en = 1'b0;
end
 
 
// Address/length counter
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    addr_len_cnt <= #1 6'h0;
  else if (update_dr_i)
    addr_len_cnt <= #1 6'h0;
  else if (addr_len_cnt_en)
    addr_len_cnt <= #1 addr_len_cnt + 1'b1;
end
 
 
always @ (enable or data_cnt_end or cmd_cnt_end or curr_cmd_go or acc_type_write or acc_type_read or crc_cnt_end)
begin
  if (enable && (!data_cnt_end))
    begin
      if (cmd_cnt_end && curr_cmd_go && acc_type_write)
        data_cnt_en = 1'b1;
      else if (crc_cnt_end && curr_cmd_go && acc_type_read)
        data_cnt_en = 1'b1;
      else
        data_cnt_en = 1'b0;
    end
  else
    data_cnt_en = 1'b0;
end
 
 
// Data counter
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    data_cnt <= #1 {`DBG_WB_DATA_CNT_WIDTH{1'b0}};
  else if (update_dr_i)
    data_cnt <= #1 {`DBG_WB_DATA_CNT_WIDTH{1'b0}};
  else if (data_cnt_en)
    data_cnt <= #1 data_cnt + 1'b1;
end
 
 
 
// Upper limit. Data counter counts until this value is reached.
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    data_cnt_limit <= #1 {`DBG_WB_DATA_CNT_WIDTH{1'b0}};
  else if (update_dr_i)
    data_cnt_limit <= #1 {len + 1'b1, 3'b000};
end
 
 
always @ (enable or crc_cnt_end or curr_cmd_rd_comm or curr_cmd_wr_comm or curr_cmd_go or addr_len_cnt_end or data_cnt_end or acc_type_write or acc_type_read or cmd_cnt_end)
begin
  if (enable && (!crc_cnt_end) && cmd_cnt_end)
    begin
      if (addr_len_cnt_end && curr_cmd_wr_comm)
        crc_cnt_en = 1'b1;
      else if (data_cnt_end && curr_cmd_go && acc_type_write)
        crc_cnt_en = 1'b1;
      else if (cmd_cnt_end && (curr_cmd_go && acc_type_read || curr_cmd_rd_comm))
        crc_cnt_en = 1'b1;
      else
        crc_cnt_en = 1'b0;
    end
  else
    crc_cnt_en = 1'b0;
end
 
 
// crc counter
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    crc_cnt <= #1 {`DBG_WB_CRC_CNT_WIDTH{1'b0}};
  else if(crc_cnt_en)
    crc_cnt <= #1 crc_cnt + 1'b1;
  else if (update_dr_i)
    crc_cnt <= #1 {`DBG_WB_CRC_CNT_WIDTH{1'b0}};
end
 
assign cmd_cnt_end      = cmd_cnt      == `DBG_WB_CMD_LEN;
assign addr_len_cnt_end = addr_len_cnt == `DBG_WB_DR_LEN;
assign crc_cnt_end      = crc_cnt      == `DBG_WB_CRC_CNT_WIDTH'd32;
assign crc_cnt_31       = crc_cnt      == `DBG_WB_CRC_CNT_WIDTH'd31;
assign data_cnt_end     = (data_cnt    == data_cnt_limit);
 
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    begin
      crc_cnt_end_q       <= #1 1'b0;
      cmd_cnt_end_q       <= #1 1'b0;
      data_cnt_end_q      <= #1 1'b0;
      addr_len_cnt_end_q  <= #1 1'b0;
    end
  else
    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;
      addr_len_cnt_end_q  <= #1 addr_len_cnt_end;
    end
end
 
 
// Status counter is made of 4 serialy connected registers
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    status_cnt <= #1 {`DBG_WB_STATUS_CNT_WIDTH{1'b0}};
  else if (update_dr_i)
    status_cnt <= #1 {`DBG_WB_STATUS_CNT_WIDTH{1'b0}};
  else if (status_cnt_en)
    status_cnt <= #1 status_cnt + 1'b1;
end
 
 
always @ (enable or status_cnt_end or crc_cnt_end or curr_cmd_rd_comm or curr_cmd_wr_comm or curr_cmd_go or acc_type_write or data_cnt_end or addr_len_cnt_end)
begin
  if (enable && (!status_cnt_end))
    begin
      if (crc_cnt_end && curr_cmd_wr_comm)
        status_cnt_en = 1'b1;
      else if (crc_cnt_end && curr_cmd_go && acc_type_write)
        status_cnt_en = 1'b1;
      else if (data_cnt_end && curr_cmd_go && acc_type_read)
        status_cnt_en = 1'b1;
      else if (addr_len_cnt_end && curr_cmd_rd_comm)
        status_cnt_en = 1'b1;
      else
        status_cnt_en = 1'b0;
    end
  else
    status_cnt_en = 1'b0;
end
 
 
assign status_cnt_end = status_cnt == `DBG_WB_STATUS_LEN;
 
 
// Latching acc_type, address and length
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    begin
      acc_type  <= #1 {`DBG_WB_ACC_TYPE_LEN{1'b0}};
      adr       <= #1 {`DBG_WB_ADR_LEN{1'b0}};
      len       <= #1 {`DBG_WB_LEN_LEN{1'b0}};
      set_addr  <= #1 1'b0;
    end
  else if(crc_cnt_end && (!crc_cnt_end_q) && crc_match_i && curr_cmd_wr_comm)
    begin
      acc_type  <= #1 dr[`DBG_WB_ACC_TYPE_LEN + `DBG_WB_ADR_LEN + `DBG_WB_LEN_LEN -1 : `DBG_WB_ADR_LEN + `DBG_WB_LEN_LEN];
      adr       <= #1 dr[`DBG_WB_ADR_LEN + `DBG_WB_LEN_LEN -1 : `DBG_WB_LEN_LEN];
      len       <= #1 dr[`DBG_WB_LEN_LEN -1:0];
      set_addr  <= #1 1'b1;
    end
  else if(wb_end_tck)               // Writing back the address
    begin
      adr  <= #1 wb_adr_dsff;
    end
  else
    set_addr <= #1 1'b0;
end
 
 
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    crc_match_reg <= #1 1'b0;
  else if(crc_cnt_end & (~crc_cnt_end_q))
    crc_match_reg <= #1 crc_match_i;
end
 
 
// Length counter
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    len_var <= #1 {1'b0, {`DBG_WB_LEN_LEN{1'b0}}};
  else if(update_dr_i)
    len_var <= #1 len + 1'b1;
  else if (start_rd_tck)
    begin
      case (acc_type)  // synthesis parallel_case full_case
        `DBG_WB_READ8 :
                    if (len_var > 'd1)
                      len_var <= #1 len_var - 1'd1;
                    else
                      len_var <= #1 {1'b0, {`DBG_WB_LEN_LEN{1'b0}}};
        `DBG_WB_READ16:
                    if (len_var > 'd2)
                      len_var <= #1 len_var - 2'd2;
                    else
                      len_var <= #1 {1'b0, {`DBG_WB_LEN_LEN{1'b0}}};
        `DBG_WB_READ32:
                    if (len_var > 'd4)
                      len_var <= #1 len_var - 3'd4;
                    else
                      len_var <= #1 {1'b0, {`DBG_WB_LEN_LEN{1'b0}}};
      endcase
    end
end
 
 
assign len_eq_0 = len_var == 'h0;
 
 
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 or posedge rst_i)
begin
  if (rst_i)
    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;
    end
end
 
 
// Start wishbone write cycle
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    begin
      start_wr_tck <= #1 1'b0;
      wb_dat_tmp <= #1 32'h0;
    end
  else if (curr_cmd_go && acc_type_write)
    begin
      case (acc_type)  // synthesis parallel_case full_case
        `DBG_WB_WRITE8  : begin
                        if (byte_q)
                          begin
                            start_wr_tck <= #1 1'b1;
                            wb_dat_tmp <= #1 {4{dr[7:0]}};
                          end
                        else
                          begin
                            start_wr_tck <= #1 1'b0;
                          end
                      end
        `DBG_WB_WRITE16 : begin
                        if (half_q)
                          begin
                            start_wr_tck <= #1 1'b1;
                            wb_dat_tmp <= #1 {2{dr[15:0]}};
                          end
                        else
                          begin
                            start_wr_tck <= #1 1'b0;
                          end
                      end
        `DBG_WB_WRITE32 : begin
                        if (long_q)
                          begin
                            start_wr_tck <= #1 1'b1;
                            wb_dat_tmp <= #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
 
 
// wb_dat_o in WB clk domain
always @ (posedge wb_clk_i)
begin
  wb_dat_dsff <= #1 wb_dat_tmp;
end
 
assign wb_dat_o = wb_dat_dsff;
 
 
// Start wishbone read cycle
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    start_rd_tck <= #1 1'b0;
  else if (curr_cmd_go && (!curr_cmd_go_q) && acc_type_read)              // First read after cmd is entered
    start_rd_tck <= #1 1'b1;
  else if ((!start_rd_tck) && curr_cmd_go && acc_type_read  && (!len_eq_0) && (!fifo_full) && (!rd_tck_started))
    start_rd_tck <= #1 1'b1;
  else
    start_rd_tck <= #1 1'b0;
end
 
 
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    rd_tck_started <= #1 1'b0;
  else if (update_dr_i || wb_end_tck && (!wb_end_tck_q))
    rd_tck_started <= #1 1'b0;
  else if (start_rd_tck)
    rd_tck_started <= #1 1'b1;
end
 
 
 
always @ (posedge wb_clk_i or posedge rst_i)
begin
  if (rst_i)
    begin
      start_rd_csff   <= #1 1'b0;
      start_wb_rd     <= #1 1'b0;
      start_wb_rd_q   <= #1 1'b0;
 
      start_wr_csff   <= #1 1'b0;
      start_wb_wr     <= #1 1'b0;
      start_wb_wr_q   <= #1 1'b0;
 
      set_addr_csff   <= #1 1'b0;
      set_addr_wb     <= #1 1'b0;
      set_addr_wb_q   <= #1 1'b0;
    end
  else
    begin
      start_rd_csff   <= #1 start_rd_tck;
      start_wb_rd     <= #1 start_rd_csff;
      start_wb_rd_q   <= #1 start_wb_rd;
 
      start_wr_csff   <= #1 start_wr_tck;
      start_wb_wr     <= #1 start_wr_csff;
      start_wb_wr_q   <= #1 start_wb_wr;
 
      set_addr_csff   <= #1 set_addr;
      set_addr_wb     <= #1 set_addr_csff;
      set_addr_wb_q   <= #1 set_addr_wb;
    end
end
 
 
// wb_cyc_o
always @ (posedge wb_clk_i or posedge rst_i)
begin
  if (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
 
 
// wb_adr_o logic
always @ (posedge wb_clk_i or posedge rst_i)
begin
  if (rst_i)
    wb_adr_dsff <= #1 32'h0;
  else if (set_addr_wb && (!set_addr_wb_q)) // Setting starting address
    wb_adr_dsff <= #1 adr;
  else if (wb_ack_i)
    begin
      if ((acc_type == `DBG_WB_WRITE8) || (acc_type == `DBG_WB_READ8))
        wb_adr_dsff <= #1 wb_adr_dsff + 1'd1;
      else if ((acc_type == `DBG_WB_WRITE16) || (acc_type == `DBG_WB_READ16))
        wb_adr_dsff <= #1 wb_adr_dsff + 2'd2;
      else
        wb_adr_dsff <= #1 wb_adr_dsff + 3'd4;
    end
end
 
 
assign wb_adr_o = wb_adr_dsff;
 
 
//    adr   byte  |  short  |  long
//     0    1000     1100      1111
//     1    0100     err       err
//     2    0010     0011      err
//     3    0001     err       err
// wb_sel_o logic
 
always @ (posedge wb_clk_i or posedge rst_i)
begin
  if (rst_i)
    wb_sel_dsff[3:0] <= #1 4'h0;
  else
    begin
      case ({wb_adr_dsff[1:0], acc_type_8bit, acc_type_16bit, acc_type_32bit}) // synthesis parallel_case full_case
        {2'd0, 3'b100} : wb_sel_dsff[3:0] <= #1 4'h8;
        {2'd0, 3'b010} : wb_sel_dsff[3:0] <= #1 4'hC;
        {2'd0, 3'b001} : wb_sel_dsff[3:0] <= #1 4'hF;
        {2'd1, 3'b100} : wb_sel_dsff[3:0] <= #1 4'h4;
        {2'd2, 3'b100} : wb_sel_dsff[3:0] <= #1 4'h2;
        {2'd2, 3'b010} : wb_sel_dsff[3:0] <= #1 4'h3;
        {2'd3, 3'b100} : wb_sel_dsff[3:0] <= #1 4'h1;
      endcase
    end
end
 
 
assign wb_sel_o = wb_sel_dsff;
 
 
always @ (posedge wb_clk_i)
begin
  wb_we_dsff <= #1 curr_cmd_go && acc_type_write;
end
 
 
assign wb_we_o = wb_we_dsff;
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
 
 
 
// Logic for detecting end of transaction
always @ (posedge wb_clk_i or posedge rst_i)
begin
  if (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 rst_i)
begin
  if (rst_i)
    begin
      wb_end_csff  <= #1 1'b0;
      wb_end_tck   <= #1 1'b0;
      wb_end_tck_q <= #1 1'b0;
    end
  else
    begin
      wb_end_csff  <= #1 wb_end;
      wb_end_tck   <= #1 wb_end_csff;
      wb_end_tck_q <= #1 wb_end_tck;
    end
end
 
 
always @ (posedge wb_clk_i or posedge rst_i)
begin
  if (rst_i)
    begin
      wb_end_rst_csff <= #1 1'b0;
      wb_end_rst      <= #1 1'b0;
    end
  else
    begin
      wb_end_rst_csff <= #1 wb_end_tck;
      wb_end_rst      <= #1 wb_end_rst_csff;
    end
end
 
 
always @ (posedge wb_clk_i or posedge rst_i)
begin
  if (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 rst_i)
begin
  if (rst_i)
    begin
      busy_csff       <= #1 1'b0;
      busy_tck        <= #1 1'b0;
 
      update_dr_csff  <= #1 1'b0;
      update_dr_wb    <= #1 1'b0;
    end
  else
    begin
      busy_csff       <= #1 busy_wb;
      busy_tck        <= #1 busy_csff;
 
      update_dr_csff  <= #1 update_dr_i;
      update_dr_wb    <= #1 update_dr_csff;
    end
end
 
 
// Detecting WB error
always @ (posedge wb_clk_i or posedge rst_i)
begin
  if (rst_i)
    wb_error <= #1 1'b0;
  else if(wb_err_i)
    wb_error <= #1 1'b1;
  else if(update_dr_wb) // error remains active until update_dr arrives
    wb_error <= #1 1'b0;
end
 
 
// Detecting overrun when write operation.
always @ (posedge wb_clk_i or posedge rst_i)
begin
  if (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(update_dr_wb) // error remains active until update_dr arrives
    wb_overrun <= #1 1'b0;
end
 
 
// Detecting underrun when read operation
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    underrun_tck <= #1 1'b0;
  else if(latch_data && fifo_empty && (!data_cnt_end))
    underrun_tck <= #1 1'b1;
  else if(update_dr_i) // error remains active until update_dr arrives
    underrun_tck <= #1 1'b0;
end
 
 
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    begin
      wb_error_csff   <= #1 1'b0;
      wb_error_tck    <= #1 1'b0;
 
      wb_overrun_csff <= #1 1'b0;
      wb_overrun_tck  <= #1 1'b0;
    end
  else
    begin
      wb_error_csff   <= #1 wb_error;
      wb_error_tck    <= #1 wb_error_csff;
 
      wb_overrun_csff <= #1 wb_overrun;
      wb_overrun_tck  <= #1 wb_overrun_csff;
    end
end
 
 
 
always @ (posedge wb_clk_i or posedge rst_i)
begin
  if (rst_i)
    begin
      wishbone_ce_csff  <= #1 1'b0;
      mem_ptr_init      <= #1 1'b0;
    end
  else
    begin
      wishbone_ce_csff  <= #1  wishbone_ce_i;
      mem_ptr_init      <= #1 ~wishbone_ce_csff;
    end
end
 
 
// Logic for latching data that is read from wishbone
always @ (posedge wb_clk_i or posedge rst_i)
begin
  if (rst_i)
    mem_ptr_dsff <= #1 3'h0;
  else if(mem_ptr_init)
    mem_ptr_dsff <= #1 3'h0;
  else if (wb_ack_i)
    begin
      if (acc_type == `DBG_WB_READ8)
        mem_ptr_dsff <= #1 mem_ptr_dsff + 1'd1;
      else if (acc_type == `DBG_WB_READ16)
        mem_ptr_dsff <= #1 mem_ptr_dsff + 2'd2;
    end
end
 
 
// Logic for latching data that is read from wishbone
always @ (posedge wb_clk_i)
begin
  if (wb_ack_i)
    begin
      case (wb_sel_dsff)    // synthesis parallel_case full_case
        4'b1000  :  mem[mem_ptr_dsff[1:0]] <= #1 wb_dat_i[31:24];            // byte
        4'b0100  :  mem[mem_ptr_dsff[1:0]] <= #1 wb_dat_i[23:16];            // byte
        4'b0010  :  mem[mem_ptr_dsff[1:0]] <= #1 wb_dat_i[15:08];            // byte
        4'b0001  :  mem[mem_ptr_dsff[1:0]] <= #1 wb_dat_i[07:00];            // byte
 
        4'b1100  :                                                      // half
                    begin
                      mem[mem_ptr_dsff[1:0]]      <= #1 wb_dat_i[31:24];
                      mem[mem_ptr_dsff[1:0]+1'b1] <= #1 wb_dat_i[23:16];
                    end
        4'b0011  :                                                      // half
                    begin
                      mem[mem_ptr_dsff[1:0]]      <= #1 wb_dat_i[15:08];
                      mem[mem_ptr_dsff[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]};
 
 
// Fifo counter and empty/full detection
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    fifo_cnt <= #1 3'h0;
  else if (update_dr_i)
    fifo_cnt <= #1 3'h0;
  else if (wb_end_tck && (!wb_end_tck_q) && (!latch_data) && (!fifo_full))  // incrementing
    begin
      case (acc_type)  // synthesis parallel_case full_case
        `DBG_WB_READ8 : fifo_cnt <= #1 fifo_cnt + 1'd1;
        `DBG_WB_READ16: fifo_cnt <= #1 fifo_cnt + 2'd2;
        `DBG_WB_READ32: fifo_cnt <= #1 fifo_cnt + 3'd4;
      endcase
    end
  else if (!(wb_end_tck && (!wb_end_tck_q)) && latch_data && (!fifo_empty))  // decrementing
    begin
      case (acc_type)  // synthesis parallel_case full_case
        `DBG_WB_READ8 : fifo_cnt <= #1 fifo_cnt - 1'd1;
        `DBG_WB_READ16: fifo_cnt <= #1 fifo_cnt - 2'd2;
        `DBG_WB_READ32: fifo_cnt <= #1 fifo_cnt - 3'd4;
      endcase
    end
end
 
 
assign fifo_full  = fifo_cnt == 3'h4;
assign fifo_empty = fifo_cnt == 3'h0;
 
reg [799:0] tdo_text;
 
// TDO multiplexer
always @ (pause_dr_i or busy_tck or crc_cnt_end or crc_cnt_end_q or curr_cmd_wr_comm or curr_cmd_go or acc_type_write or acc_type_read or crc_match_i or data_cnt_end or dr or data_cnt_end_q or crc_match_reg or status_cnt_en or status or addr_len_cnt_end or addr_len_cnt_end_q)
begin
  if (pause_dr_i)
    begin
    tdo_o = busy_tck;
    tdo_text = "busy_tck";
    end
  else if (crc_cnt_end && (!crc_cnt_end_q) && (curr_cmd_wr_comm || curr_cmd_go && acc_type_write ))
    begin
      tdo_o = ~crc_match_i;
      tdo_text = "crc_match_i";
    end
  else if (curr_cmd_go && acc_type_read && crc_cnt_end && (!data_cnt_end))
    begin
      tdo_o = dr[31];
      tdo_text = "dr[31]";
    end
  else if (curr_cmd_go && acc_type_read && data_cnt_end && (!data_cnt_end_q))
    begin
      tdo_o = ~crc_match_reg;
      tdo_text = "crc_match_reg";
    end
  else if (curr_cmd_rd_comm && addr_len_cnt_end && (!addr_len_cnt_end_q))
    begin
      tdo_o = ~crc_match_reg;
      tdo_text = "crc_match_reg_rd_comm";
    end
  else if (curr_cmd_rd_comm && crc_cnt_end && (!addr_len_cnt_end))
    begin
      tdo_o = dr[`DBG_WB_ACC_TYPE_LEN + `DBG_WB_ADR_LEN + `DBG_WB_LEN_LEN -1];
      tdo_text = "rd_comm data";
    end
  else if (status_cnt_en)
    begin
      tdo_o = status[3];
      tdo_text = "status";
    end
  else
    begin
      tdo_o = 1'b0;
      tdo_text = "zero";
    end
end
 
reg [799:0] status_text;
// Status register
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    begin
    status <= #1 {`DBG_WB_STATUS_LEN{1'b0}};
    status_text = "reset";
    end
  else if(crc_cnt_end && (!crc_cnt_end_q) && (!(curr_cmd_go && acc_type_read)))
    begin
    status <= #1 {1'b0, wb_error_tck, wb_overrun_tck, crc_match_i};
    status_text = "latch ni read";
    end
  else if (data_cnt_end && (!data_cnt_end_q) && curr_cmd_go && acc_type_read)
    begin
    status <= #1 {1'b0, wb_error_tck, underrun_tck, crc_match_reg};
    status_text = "latch read";
    end
  else if (addr_len_cnt_end && (!addr_len_cnt_end) && curr_cmd_rd_comm)
    begin
    status <= #1 {1'b0, 1'b0, 1'b0, crc_match_reg};
    status_text = "rd_comm";
    end
  else if (shift_dr_i && (!status_cnt_end))
    begin
    status <= #1 {status[`DBG_WB_STATUS_LEN -2:0], status[`DBG_WB_STATUS_LEN -1]};
    status_text = "shifting";
    end
end
// Following status is shifted out (MSB first):
// 3. bit:          1 if crc is OK, else 0
// 2. bit:          1'b0
// 1. bit:          1 if WB error occured, else 0
// 0. bit:          1 if overrun occured during write (data couldn't be written fast enough)
//                    or underrun occured during read (data couldn't be read fast enough)
 
 
endmodule
 

Line No.	Rev	Author	Line
1	82	mohor	`//////////////////////////////////////////////////////////////////////`
2			`//// ////`
3			`//// dbg_wb.v ////`
4			`//// ////`
5			`//// ////`
6	139	igorm	`//// This file is part of the SoC Debug Interface. ////`
7	82	mohor	`//// 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	138	igorm	`//// Copyright (C) 2000 - 2004 Authors ////`
19	82	mohor	`//// ////`
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	139	igorm	`// Revision 1.19 2004/03/22 16:35:46 igorm`
47			`// Temp version before changing dbg interface.`
48			`//`
49	138	igorm	`// Revision 1.18 2004/01/25 14:04:18 mohor`
50			`// All flipflops are reset.`
51			`//`
52	123	mohor	`// Revision 1.17 2004/01/22 13:58:53 mohor`
53			`// Port signals are all set to zero after reset.`
54			`//`
55	121	mohor	`// Revision 1.16 2004/01/19 07:32:41 simons`
56			`// Reset values width added because of FV, a good sentence changed because some tools can not handle it.`
57			`//`
58	108	simons	`// Revision 1.15 2004/01/17 18:01:24 mohor`
59			`// New version.`
60			`//`
61	102	mohor	`// Revision 1.14 2004/01/16 14:51:33 mohor`
62			`// cpu registers added.`
63			`//`
64	99	mohor	`// Revision 1.13 2004/01/15 12:09:43 mohor`
65			`// Working.`
66			`//`
67	97	mohor	`// Revision 1.12 2004/01/14 22:59:18 mohor`
68			`// Temp version.`
69			`//`
70	95	mohor	`// Revision 1.11 2004/01/14 12:29:40 mohor`
71			`// temp version. Resets will be changed in next version.`
72			`//`
73	94	mohor	`// Revision 1.10 2004/01/13 11:28:14 mohor`
74			`// tmp version.`
75			`//`
76	93	mohor	`// Revision 1.9 2004/01/10 07:50:24 mohor`
77			`// temp version.`
78			`//`
79	92	mohor	`// Revision 1.8 2004/01/09 12:48:44 mohor`
80			`// tmp version.`
81			`//`
82	91	mohor	`// Revision 1.7 2004/01/08 17:53:36 mohor`
83			`// tmp version.`
84			`//`
85	90	mohor	`// Revision 1.6 2004/01/07 11:58:56 mohor`
86			`// temp4 version.`
87			`//`
88	89	mohor	`// Revision 1.5 2004/01/06 17:15:19 mohor`
89			`// temp3 version.`
90			`//`
91	88	mohor	`// Revision 1.4 2004/01/05 12:16:00 mohor`
92			`// tmp2 version.`
93			`//`
94	87	mohor	`// Revision 1.3 2003/12/23 16:22:46 mohor`
95			`// Tmp version.`
96			`//`
97	86	mohor	`// Revision 1.2 2003/12/23 15:26:26 mohor`
98			`// Small fix.`
99			`//`
100	83	mohor	`// Revision 1.1 2003/12/23 15:09:04 mohor`
101			`// New directory structure. New version of the debug interface.`
102	82	mohor	`//`
103			`//`
104	83	mohor	`//`
105	82	mohor
106			`// synopsys translate_off`
107			`include "timescale.v"
108			`// synopsys translate_on`
109			`include "dbg_wb_defines.v"
110
111			`// Top module`
112			`module dbg_wb(`
113			`// JTAG signals`
114			`tck_i,`
115			`tdi_i,`
116			`tdo_o,`
117
118			`// TAP states`
119			`shift_dr_i,`
120			`pause_dr_i,`
121			`update_dr_i,`
122
123			`wishbone_ce_i,`
124			`crc_match_i,`
125			`crc_en_o,`
126			`shift_crc_o,`
127	95	mohor	`rst_i,`
128	82	mohor
129			`// WISHBONE common signals`
130	95	mohor	`wb_clk_i,`
131	82	mohor
132			`// WISHBONE master interface`
133			`wb_adr_o, wb_dat_o, wb_dat_i, wb_cyc_o, wb_stb_o, wb_sel_o,`
134			`wb_we_o, wb_ack_i, wb_cab_o, wb_err_i, wb_cti_o, wb_bte_o`
135
136			`);`
137
138			`// JTAG signals`
139	97	mohor	`input tck_i;`
140			`input tdi_i;`
141			`output tdo_o;`
142	82	mohor
143			`// TAP states`
144	97	mohor	`input shift_dr_i;`
145			`input pause_dr_i;`
146			`input update_dr_i;`
147	82	mohor
148	97	mohor	`input wishbone_ce_i;`
149			`input crc_match_i;`
150			`output crc_en_o;`
151			`output shift_crc_o;`
152			`input rst_i;`
153	82	mohor	`// WISHBONE common signals`
154	97	mohor	`input wb_clk_i;`
155	82	mohor
156			`// WISHBONE master interface`
157			`output [31:0] wb_adr_o;`
158			`output [31:0] wb_dat_o;`
159			`input [31:0] wb_dat_i;`
160			`output wb_cyc_o;`
161			`output wb_stb_o;`
162			`output [3:0] wb_sel_o;`
163			`output wb_we_o;`
164			`input wb_ack_i;`
165			`output wb_cab_o;`
166			`input wb_err_i;`
167			`output [2:0] wb_cti_o;`
168			`output [1:0] wb_bte_o;`
169
170			`reg wb_cyc_o;`
171
172			`reg tdo_o;`
173
174	139	igorm	`reg [31:0] wb_dat_tmp, wb_dat_dsff;`
175			`reg [31:0] wb_adr_dsff;`
176			`reg [3:0] wb_sel_dsff;`
177			`reg wb_we_dsff;`
178			reg [`DBG_WB_DR_LEN -1 :0] dr;
179	88	mohor	`wire enable;`
180	90	mohor	`wire cmd_cnt_en;`
181	138	igorm	reg [`DBG_WB_CMD_CNT_WIDTH -1:0] cmd_cnt;
182	88	mohor	`wire cmd_cnt_end;`
183			`reg cmd_cnt_end_q;`
184	139	igorm	`reg addr_len_cnt_en;`
185	88	mohor	`reg [5:0] addr_len_cnt;`
186			`wire addr_len_cnt_end;`
187	139	igorm	`reg addr_len_cnt_end_q;`
188			`reg crc_cnt_en;`
189			reg [`DBG_WB_CRC_CNT_WIDTH -1:0] crc_cnt;
190	88	mohor	`wire crc_cnt_end;`
191			`reg crc_cnt_end_q;`
192	139	igorm	`reg data_cnt_en;`
193			reg [`DBG_WB_DATA_CNT_WIDTH:0] data_cnt;
194			reg [`DBG_WB_DATA_CNT_WIDTH:0] data_cnt_limit;
195	88	mohor	`wire data_cnt_end;`
196	90	mohor	`reg data_cnt_end_q;`
197	82	mohor
198	90	mohor	`reg crc_match_reg;`
199	82	mohor
200	139	igorm	reg [`DBG_WB_ACC_TYPE_LEN -1:0] acc_type;
201			reg [`DBG_WB_ADR_LEN -1:0] adr;
202			reg [`DBG_WB_LEN_LEN -1:0] len;
203			reg [`DBG_WB_LEN_LEN:0] len_var;
204	92	mohor	`reg start_rd_tck;`
205	97	mohor	`reg rd_tck_started;`
206	139	igorm	`reg start_rd_csff;`
207	92	mohor	`reg start_wb_rd;`
208			`reg start_wb_rd_q;`
209			`reg start_wr_tck;`
210	139	igorm	`reg start_wr_csff;`
211	92	mohor	`reg start_wb_wr;`
212			`reg start_wb_wr_q;`
213	88	mohor
214	139	igorm	`reg status_cnt_en;`
215	92	mohor	`wire status_cnt_end;`
216	89	mohor
217	92	mohor	`wire byte, half, long;`
218			`reg byte_q, half_q, long_q;`
219	90	mohor
220	139	igorm	reg [`DBG_WB_STATUS_CNT_WIDTH -1:0] status_cnt;
221	90	mohor
222	138	igorm	reg [`DBG_WB_STATUS_LEN -1:0] status;
223	92	mohor
224	139	igorm	`reg wb_error, wb_error_csff, wb_error_tck;`
225			`reg wb_overrun, wb_overrun_csff, wb_overrun_tck;`
226	97	mohor	`reg underrun_tck;`
227	92	mohor
228	97	mohor	`reg busy_wb;`
229			`reg busy_tck;`
230			`reg wb_end;`
231			`reg wb_end_rst;`
232	139	igorm	`reg wb_end_rst_csff;`
233			`reg wb_end_csff;`
234	97	mohor	`reg wb_end_tck, wb_end_tck_q;`
235	139	igorm	`reg busy_csff;`
236	97	mohor	`reg latch_data;`
237	139	igorm	`reg update_dr_csff, update_dr_wb;`
238	92	mohor
239	139	igorm	`reg set_addr, set_addr_csff, set_addr_wb, set_addr_wb_q;`
240	97	mohor	`wire [31:0] input_data;`
241	92	mohor
242	97	mohor	`wire len_eq_0;`
243			`wire crc_cnt_31;`
244	93	mohor
245	97	mohor	`reg [1:0] ptr;`
246			`reg [2:0] fifo_cnt;`
247			`wire fifo_full;`
248			`wire fifo_empty;`
249			`reg [7:0] mem [0:3];`
250	139	igorm	`reg [2:0] mem_ptr_dsff;`
251			`reg wishbone_ce_csff;`
252			`reg mem_ptr_init;`
253			reg [`DBG_WB_CMD_LEN -1: 0] curr_cmd;
254			`wire curr_cmd_go;`
255			`reg curr_cmd_go_q;`
256			`wire curr_cmd_wr_comm;`
257			`wire curr_cmd_rd_comm;`
258			`wire acc_type_read;`
259			`wire acc_type_write;`
260			`wire acc_type_8bit;`
261			`wire acc_type_16bit;`
262			`wire acc_type_32bit;`
263	97	mohor
264
265	82	mohor	`assign enable = wishbone_ce_i & shift_dr_i;`
266	90	mohor	`assign crc_en_o = enable & crc_cnt_end & (~status_cnt_end);`
267	89	mohor	`assign shift_crc_o = enable & status_cnt_end; // Signals dbg module to shift out the CRC`
268	82	mohor
269	139	igorm	assign curr_cmd_go = (curr_cmd == `DBG_WB_GO) && cmd_cnt_end;
270			assign curr_cmd_wr_comm = (curr_cmd == `DBG_WB_WR_COMM) && cmd_cnt_end;
271			assign curr_cmd_rd_comm = (curr_cmd == `DBG_WB_RD_COMM) && cmd_cnt_end;
272	82	mohor
273	139	igorm	assign acc_type_read = (acc_type == `DBG_WB_READ8 \|\| acc_type == `DBG_WB_READ16 \|\| acc_type == `DBG_WB_READ32);
274			assign acc_type_write = (acc_type == `DBG_WB_WRITE8 \|\| acc_type == `DBG_WB_WRITE16 \|\| acc_type == `DBG_WB_WRITE32);
275
276			assign acc_type_8bit = (acc_type == `DBG_WB_READ8 \|\| acc_type == `DBG_WB_WRITE8);
277			assign acc_type_16bit = (acc_type == `DBG_WB_READ16 \|\| acc_type == `DBG_WB_WRITE16);
278			assign acc_type_32bit = (acc_type == `DBG_WB_READ32 \|\| acc_type == `DBG_WB_WRITE32);
279
280
281			`// Selecting where to take the data from`
282	123	mohor	`always @ (posedge tck_i or posedge rst_i)`
283	82	mohor	`begin`
284	123	mohor	`if (rst_i)`
285	93	mohor	`ptr <= #1 2'h0;`
286	123	mohor	`else if (update_dr_i)`
287			`ptr <= #1 2'h0;`
288	139	igorm	`else if (curr_cmd_go && acc_type_read && crc_cnt_31) // first latch`
289	93	mohor	`ptr <= #1 ptr + 1'b1;`
290	139	igorm	`else if (curr_cmd_go && acc_type_read && byte && (!byte_q))`
291	93	mohor	`ptr <= ptr + 1'd1;`
292			`end`
293	139	igorm
294	93	mohor
295	139	igorm	`reg [799:0] dr_text;`
296	97	mohor	`// Shift register for shifting in and out the data`
297	121	mohor	`always @ (posedge tck_i or posedge rst_i)`
298	93	mohor	`begin`
299	121	mohor	`if (rst_i)`
300	90	mohor	`begin`
301	121	mohor	`latch_data <= #1 1'b0;`
302	139	igorm	dr <= #1 {`DBG_WB_DR_LEN{1'b0}};
303			`dr_text = "reset";`
304	121	mohor	`end`
305	139	igorm	`else if (curr_cmd_rd_comm && crc_cnt_31) // Latching data (from iternal regs)`
306	121	mohor	`begin`
307	139	igorm	dr[`DBG_WB_ACC_TYPE_LEN + `DBG_WB_ADR_LEN + `DBG_WB_LEN_LEN -1:0] <= #1 {acc_type, adr, len};
308			`dr_text = "latch reg data";`
309			`end`
310			`else if (acc_type_read && curr_cmd_go && crc_cnt_31) // Latchind first data (from WB)`
311			`begin`
312	93	mohor	`dr[31:0] <= #1 input_data[31:0];`
313	97	mohor	`latch_data <= #1 1'b1;`
314	139	igorm	`dr_text = "latch first data";`
315	93	mohor	`end`
316	139	igorm	`else if (acc_type_read && curr_cmd_go && crc_cnt_end) // Latching data (from WB)`
317	93	mohor	`begin`
318	139	igorm	`case (acc_type) // synthesis parallel_case full_case`
319			`DBG_WB_READ8 : begin
320	90	mohor	`if(byte & (~byte_q))`
321	92	mohor	`begin`
322	93	mohor	`case (ptr) // synthesis parallel_case`
323			`2'b00 : dr[31:24] <= #1 input_data[31:24];`
324			`2'b01 : dr[31:24] <= #1 input_data[23:16];`
325			`2'b10 : dr[31:24] <= #1 input_data[15:8];`
326			`2'b11 : dr[31:24] <= #1 input_data[7:0];`
327			`endcase`
328	97	mohor	`latch_data <= #1 1'b1;`
329	139	igorm	`dr_text = "latch_data byte";`
330	92	mohor	`end`
331	90	mohor	`else`
332	92	mohor	`begin`
333	93	mohor	`dr[31:24] <= #1 {dr[30:24], 1'b0};`
334	97	mohor	`latch_data <= #1 1'b0;`
335	139	igorm	`dr_text = "shift byte";`
336	92	mohor	`end`
337	90	mohor	`end`
338	139	igorm	`DBG_WB_READ16: begin
339	90	mohor	`if(half & (~half_q))`
340	92	mohor	`begin`
341	93	mohor	`if (ptr[1])`
342	97	mohor	`dr[31:16] <= #1 input_data[15:0];`
343			`else`
344	93	mohor	`dr[31:16] <= #1 input_data[31:16];`
345	97	mohor	`latch_data <= #1 1'b1;`
346	139	igorm	`dr_text = "latch_data_half";`
347	92	mohor	`end`
348	90	mohor	`else`
349	92	mohor	`begin`
350	93	mohor	`dr[31:16] <= #1 {dr[30:16], 1'b0};`
351	97	mohor	`latch_data <= #1 1'b0;`
352	139	igorm	`dr_text = "shift half";`
353	92	mohor	`end`
354	90	mohor	`end`
355	139	igorm	`DBG_WB_READ32: begin
356	90	mohor	`if(long & (~long_q))`
357	92	mohor	`begin`
358	93	mohor	`dr[31:0] <= #1 input_data[31:0];`
359	97	mohor	`latch_data <= #1 1'b1;`
360	139	igorm	`dr_text = "latch_data word";`
361	92	mohor	`end`
362	90	mohor	`else`
363	92	mohor	`begin`
364	93	mohor	`dr[31:0] <= #1 {dr[30:0], 1'b0};`
365	97	mohor	`latch_data <= #1 1'b0;`
366	139	igorm	`dr_text = "shift word";`
367	92	mohor	`end`
368	90	mohor	`end`
369			`endcase`
370			`end`
371	139	igorm	`else if (enable && (!addr_len_cnt_end))`
372	92	mohor	`begin`
373	139	igorm	dr <= #1 {dr[`DBG_WB_DR_LEN -2:0], tdi_i};
374			`dr_text = "shift dr";`
375	92	mohor	`end`
376	82	mohor	`end`
377
378
379	139	igorm
380	90	mohor	`assign cmd_cnt_en = enable & (~cmd_cnt_end);`
381	88	mohor
382	97	mohor
383			`// Command counter`
384	95	mohor	`always @ (posedge tck_i or posedge rst_i)`
385	82	mohor	`begin`
386	95	mohor	`if (rst_i)`
387	138	igorm	cmd_cnt <= #1 {`DBG_WB_CMD_CNT_WIDTH{1'b0}};
388	82	mohor	`else if (update_dr_i)`
389	138	igorm	cmd_cnt <= #1 {`DBG_WB_CMD_CNT_WIDTH{1'b0}};
390	90	mohor	`else if (cmd_cnt_en)`
391	87	mohor	`cmd_cnt <= #1 cmd_cnt + 1'b1;`
392	82	mohor	`end`
393
394
395	139	igorm	`// Assigning current command`
396	95	mohor	`always @ (posedge tck_i or posedge rst_i)`
397	87	mohor	`begin`
398	95	mohor	`if (rst_i)`
399	139	igorm	curr_cmd <= #1 {`DBG_WB_CMD_LEN{1'b0}};
400	88	mohor	`else if (update_dr_i)`
401	139	igorm	curr_cmd <= #1 {`DBG_WB_CMD_LEN{1'b0}};
402			else if (cmd_cnt == (`DBG_WB_CMD_LEN -1))
403			curr_cmd <= #1 {dr[`DBG_WB_CMD_LEN-2 :0], tdi_i};
404	88	mohor	`end`
405
406
407	139	igorm	`// Assigning current command`
408	95	mohor	`always @ (posedge tck_i or posedge rst_i)`
409	88	mohor	`begin`
410	95	mohor	`if (rst_i)`
411	139	igorm	`curr_cmd_go_q <= #1 1'b0;`
412			`else`
413			`curr_cmd_go_q <= #1 curr_cmd_go;`
414	87	mohor	`end`
415	82	mohor
416	87	mohor
417	139	igorm	`always @ (enable or cmd_cnt_end or addr_len_cnt_end or curr_cmd_wr_comm or curr_cmd_rd_comm or crc_cnt_end)`
418	88	mohor	`begin`
419	139	igorm	`if (enable && (!addr_len_cnt_end))`
420	123	mohor	`begin`
421	139	igorm	`if (cmd_cnt_end && curr_cmd_wr_comm)`
422			`addr_len_cnt_en = 1'b1;`
423			`else if (crc_cnt_end && curr_cmd_rd_comm)`
424			`addr_len_cnt_en = 1'b1;`
425			`else`
426			`addr_len_cnt_en = 1'b0;`
427	123	mohor	`end`
428			`else`
429	139	igorm	`addr_len_cnt_en = 1'b0;`
430	88	mohor	`end`
431
432
433	139	igorm	`// Address/length counter`
434	123	mohor	`always @ (posedge tck_i or posedge rst_i)`
435	88	mohor	`begin`
436	123	mohor	`if (rst_i)`
437	139	igorm	`addr_len_cnt <= #1 6'h0;`
438	123	mohor	`else if (update_dr_i)`
439	139	igorm	`addr_len_cnt <= #1 6'h0;`
440			`else if (addr_len_cnt_en)`
441			`addr_len_cnt <= #1 addr_len_cnt + 1'b1;`
442			`end`
443
444
445			`always @ (enable or data_cnt_end or cmd_cnt_end or curr_cmd_go or acc_type_write or acc_type_read or crc_cnt_end)`
446			`begin`
447			`if (enable && (!data_cnt_end))`
448	123	mohor	`begin`
449	139	igorm	`if (cmd_cnt_end && curr_cmd_go && acc_type_write)`
450			`data_cnt_en = 1'b1;`
451			`else if (crc_cnt_end && curr_cmd_go && acc_type_read)`
452			`data_cnt_en = 1'b1;`
453			`else`
454			`data_cnt_en = 1'b0;`
455	123	mohor	`end`
456	139	igorm	`else`
457			`data_cnt_en = 1'b0;`
458	88	mohor	`end`
459
460
461	139	igorm	`// Data counter`
462	123	mohor	`always @ (posedge tck_i or posedge rst_i)`
463	88	mohor	`begin`
464	123	mohor	`if (rst_i)`
465	139	igorm	data_cnt <= #1 {`DBG_WB_DATA_CNT_WIDTH{1'b0}};
466			`else if (update_dr_i)`
467			data_cnt <= #1 {`DBG_WB_DATA_CNT_WIDTH{1'b0}};
468			`else if (data_cnt_en)`
469			`data_cnt <= #1 data_cnt + 1'b1;`
470	88	mohor	`end`
471
472	94	mohor
473	88	mohor
474	97	mohor	`// Upper limit. Data counter counts until this value is reached.`
475	123	mohor	`always @ (posedge tck_i or posedge rst_i)`
476	94	mohor	`begin`
477	123	mohor	`if (rst_i)`
478	139	igorm	data_cnt_limit <= #1 {`DBG_WB_DATA_CNT_WIDTH{1'b0}};
479	123	mohor	`else if (update_dr_i)`
480	139	igorm	`data_cnt_limit <= #1 {len + 1'b1, 3'b000};`
481	94	mohor	`end`
482	88	mohor
483	90	mohor
484	139	igorm	`always @ (enable or crc_cnt_end or curr_cmd_rd_comm or curr_cmd_wr_comm or curr_cmd_go or addr_len_cnt_end or data_cnt_end or acc_type_write or acc_type_read or cmd_cnt_end)`
485			`begin`
486			`if (enable && (!crc_cnt_end) && cmd_cnt_end)`
487			`begin`
488			`if (addr_len_cnt_end && curr_cmd_wr_comm)`
489			`crc_cnt_en = 1'b1;`
490			`else if (data_cnt_end && curr_cmd_go && acc_type_write)`
491			`crc_cnt_en = 1'b1;`
492			`else if (cmd_cnt_end && (curr_cmd_go && acc_type_read \|\| curr_cmd_rd_comm))`
493			`crc_cnt_en = 1'b1;`
494			`else`
495			`crc_cnt_en = 1'b0;`
496			`end`
497			`else`
498			`crc_cnt_en = 1'b0;`
499			`end`
500	94	mohor

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