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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                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
 
// 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_LIM_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_INT -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 <=  2'h0;
  else if (update_dr_i)
    ptr <=  2'h0;
  else if (curr_cmd_go && acc_type_read && crc_cnt_31) // first latch
    ptr <=  ptr + 1'b1;
  else if (curr_cmd_go && acc_type_read && byte && (!byte_q))
    ptr <= ptr + 1'd1;
end
 
 
// 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'b0;
      dr <=  {`DBG_WB_DR_LEN{1'b0}};
    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] <=  {acc_type, adr, len};
    end
  else if (acc_type_read && curr_cmd_go && crc_cnt_31 && !busy_tck)  // Latchind first data (from WB)
    begin
      dr[31:0] <=  input_data[31:0];
      latch_data <=  1'b1;
    end
  else if (acc_type_read && curr_cmd_go && crc_cnt_end && !busy_tck && wb_end_tck_q)
    begin
       // Had to wait for data from WB.
       dr[31:0] <=  input_data[31:0];
       latch_data <=  1'b1;
    end
  else if (acc_type_read && curr_cmd_go && crc_cnt_end && !busy_tck) // Latching data (from WB)
    begin
      if (acc_type == `DBG_WB_READ8)
        begin
          if(byte & (~byte_q))
            begin
              case (ptr)    // synthesis parallel_case
                2'b00 : dr[31:24] <=  input_data[31:24];
                2'b01 : dr[31:24] <=  input_data[23:16];
                2'b10 : dr[31:24] <=  input_data[15:8];
                2'b11 : dr[31:24] <=  input_data[7:0];
              endcase
              latch_data <=  1'b1;
            end
          else
            begin
               if (enable) // jb
                 dr[31:24] <=  {dr[30:24], 1'b0};
              latch_data <=  1'b0;
            end
        end
      else if (acc_type == `DBG_WB_READ16)
        begin
          if(half & (~half_q))
            begin
              if (ptr[1])
                dr[31:16] <=  input_data[15:0];
              else
                dr[31:16] <=  input_data[31:16];
              latch_data <=  1'b1;
            end
          else
            begin
               if (enable) // jb
                 dr[31:16] <=  {dr[30:16], 1'b0};
              latch_data <=  1'b0;
            end
        end
      else if (acc_type == `DBG_WB_READ32)
        begin
          if(long & (~long_q))
            begin
              dr[31:0] <=  input_data[31:0];
              latch_data <=  1'b1;
            end
          else
            begin
               if (enable) // jb
                 dr[31:0] <=  {dr[30:0], 1'b0};
              latch_data <=  1'b0;
            end
        end
    end
  else if (enable && (!addr_len_cnt_end))
    begin
      dr <=  {dr[`DBG_WB_DR_LEN -2:0], tdi_i};
    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 <=  {`DBG_WB_CMD_CNT_WIDTH{1'b0}};
  else if (update_dr_i)
    cmd_cnt <=  {`DBG_WB_CMD_CNT_WIDTH{1'b0}};
  else if (cmd_cnt_en)
    cmd_cnt <=  cmd_cnt + `DBG_WB_CMD_CNT_WIDTH'd1;
end
 
 
// Assigning current command
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    curr_cmd <=  {`DBG_WB_CMD_LEN_INT{1'b0}};
  else if (update_dr_i)
    curr_cmd <=  {`DBG_WB_CMD_LEN_INT{1'b0}};
  else if (cmd_cnt == (`DBG_WB_CMD_LEN_INT -1))
    curr_cmd <=  {dr[`DBG_WB_CMD_LEN_INT-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'b0;
  else
    curr_cmd_go_q <=  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 <=  6'd0;
  else if (update_dr_i)
    addr_len_cnt <=  6'd0;
  else if (addr_len_cnt_en)
    addr_len_cnt <=  addr_len_cnt + 6'd1;
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 <=  {`DBG_WB_DATA_CNT_WIDTH+1{1'b0}};
  else if (update_dr_i)
    data_cnt <=  {`DBG_WB_DATA_CNT_WIDTH+1{1'b0}};
  else if (data_cnt_en)
    data_cnt <=  data_cnt + 1;
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 <=  {`DBG_WB_DATA_CNT_LIM_WIDTH+1{1'b0}};
  else if (update_dr_i)
    data_cnt_limit <=  len + 1;
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 <=  {`DBG_WB_CRC_CNT_WIDTH{1'b0}};
  else if(crc_cnt_en)
    crc_cnt <=  crc_cnt + 1;
  else if (update_dr_i)
    crc_cnt <=  {`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, 3'b000});
 
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    begin
      crc_cnt_end_q       <=  1'b0;
      cmd_cnt_end_q       <=  1'b0;
      data_cnt_end_q      <=  1'b0;
      addr_len_cnt_end_q  <=  1'b0;
    end
  else
    begin
      crc_cnt_end_q       <=  crc_cnt_end;
      cmd_cnt_end_q       <=  cmd_cnt_end;
      data_cnt_end_q      <=  data_cnt_end;
      addr_len_cnt_end_q  <=  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 <=  {`DBG_WB_STATUS_CNT_WIDTH{1'b0}};
  else if (update_dr_i)
    status_cnt <=  {`DBG_WB_STATUS_CNT_WIDTH{1'b0}};
  else if (status_cnt_en)
    status_cnt <=  status_cnt + `DBG_WB_STATUS_CNT_WIDTH'd1;
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 acc_type_read 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  <=  {`DBG_WB_ACC_TYPE_LEN{1'b0}};
      adr       <=  {`DBG_WB_ADR_LEN{1'b0}};
      len       <=  {`DBG_WB_LEN_LEN{1'b0}};
      set_addr  <=  1'b0;
    end
  else if(crc_cnt_end && (!crc_cnt_end_q) && crc_match_i && curr_cmd_wr_comm)
    begin
      acc_type  <=  dr[`DBG_WB_ACC_TYPE_LEN + `DBG_WB_ADR_LEN + `DBG_WB_LEN_LEN -1 : `DBG_WB_ADR_LEN + `DBG_WB_LEN_LEN];
      adr       <=  dr[`DBG_WB_ADR_LEN + `DBG_WB_LEN_LEN -1 : `DBG_WB_LEN_LEN];
      len       <=  dr[`DBG_WB_LEN_LEN -1:0];
      set_addr  <=  1'b1;
    end
  else if(wb_end_tck)               // Writing back the address
    begin
      adr  <=  wb_adr_dsff;
    end
  else
    set_addr <=  1'b0;
end
 
 
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    crc_match_reg <=  1'b0;
  else if(crc_cnt_end & (~crc_cnt_end_q))
    crc_match_reg <=  crc_match_i;
end
 
// Length counter
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    len_var <=  {1'b0, {`DBG_WB_LEN_LEN{1'b0}}};
  else if(update_dr_i)
    len_var <=  len + 1;
  else if (start_rd_tck)
    begin
      case (acc_type)  // synthesis parallel_case
        `DBG_WB_READ8 :
                    if (len_var > 'd1)
                      len_var <=  len_var - 1;
                    else
                      len_var <=  {1'b0, {`DBG_WB_LEN_LEN{1'b0}}};
        `DBG_WB_READ16:
                    if (len_var > 'd2)
                      len_var <=  len_var - 2;
                    else
                      len_var <=  {1'b0, {`DBG_WB_LEN_LEN{1'b0}}};
        `DBG_WB_READ32:
                    if (len_var > 'd4)
                      len_var <=  len_var - 4;
                    else
                      len_var <=  {1'b0, {`DBG_WB_LEN_LEN{1'b0}}};
        default:      len_var <=  {1'bx, {`DBG_WB_LEN_LEN{1'bx}}};
      endcase
    end
end
 
 
assign len_eq_0 = !(|len_var);
 
 
 
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'b0;
      half_q <=   1'b0;
      long_q <=   1'b0;
    end
  else
    begin
      byte_q <=  byte;
      half_q <=  half;
      long_q <=  long;
    end
end
 
 
// Start wishbone write cycle
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    begin
      start_wr_tck <=  1'b0;
      wb_dat_tmp <=  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'b1;
                            wb_dat_tmp <=  {4{dr[7:0]}};
                          end
                        else
                          begin
                            start_wr_tck <=  1'b0;
                          end
                      end
        `DBG_WB_WRITE16 : begin
                        if (half_q)
                          begin
                            start_wr_tck <=  1'b1;
                            wb_dat_tmp <=  {2{dr[15:0]}};
                          end
                        else
                          begin
                            start_wr_tck <=  1'b0;
                          end
                      end
        `DBG_WB_WRITE32 : begin
                        if (long_q)
                          begin
                            start_wr_tck <=  1'b1;
                            wb_dat_tmp <=  dr[31:0];
                          end
                        else
                          begin
                            start_wr_tck <=  1'b0;
                          end
                       end
        default: begin
 
        end
      endcase
    end
  else
    start_wr_tck <=  1'b0;
end
 
 
// wb_dat_o in WB clk domain
always @ (posedge wb_clk_i)
begin
  wb_dat_dsff <=  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'b0;
  else if (curr_cmd_go && (!curr_cmd_go_q) && acc_type_read)              // First read after cmd is entered
    start_rd_tck <=  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'b1;
  else
    start_rd_tck <=  1'b0;
end
 
 
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    rd_tck_started <=  1'b0;
  else if (update_dr_i || wb_end_tck && (!wb_end_tck_q))
    rd_tck_started <=  1'b0;
  else if (start_rd_tck)
    rd_tck_started <=  1'b1;
end
 
 
 
always @ (posedge wb_clk_i or posedge rst_i)
begin
  if (rst_i)
    begin
      start_rd_csff   <=  1'b0;
      start_wb_rd     <=  1'b0;
      start_wb_rd_q   <=  1'b0;
 
      start_wr_csff   <=  1'b0;
      start_wb_wr     <=  1'b0;
      start_wb_wr_q   <=  1'b0;
 
      set_addr_csff   <=  1'b0;
      set_addr_wb     <=  1'b0;
      set_addr_wb_q   <=  1'b0;
    end
  else
    begin
      start_rd_csff   <=  start_rd_tck;
      start_wb_rd     <=  start_rd_csff;
      start_wb_rd_q   <=  start_wb_rd;
 
      start_wr_csff   <=  start_wr_tck;
      start_wb_wr     <=  start_wr_csff;
      start_wb_wr_q   <=  start_wb_wr;
 
      set_addr_csff   <=  set_addr;
      set_addr_wb     <=  set_addr_csff;
      set_addr_wb_q   <=  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'b0;
  else if ((start_wb_wr && (!start_wb_wr_q)) || (start_wb_rd && (!start_wb_rd_q)))
    wb_cyc_o <=  1'b1;
  else if (wb_ack_i || wb_err_i)
    wb_cyc_o <=  1'b0;
end
 
 
// wb_adr_o logic
always @ (posedge wb_clk_i or posedge rst_i)
begin
  if (rst_i)
    wb_adr_dsff <=  32'd0;
  else if (set_addr_wb && (!set_addr_wb_q)) // Setting starting address
    wb_adr_dsff <=  adr;
  else if (wb_ack_i)
    begin
      if ((acc_type == `DBG_WB_WRITE8) || (acc_type == `DBG_WB_READ8))
        wb_adr_dsff <=  wb_adr_dsff + 32'd1;
      else if ((acc_type == `DBG_WB_WRITE16) || (acc_type == `DBG_WB_READ16))
        wb_adr_dsff <=  wb_adr_dsff + 32'd2;
      else
        wb_adr_dsff <=  wb_adr_dsff + 32'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] <=  4'h0;
  else if ((start_wb_wr && (!start_wb_wr_q)))
    begin
      case ({wb_adr_dsff[1:0], acc_type_8bit, acc_type_16bit, acc_type_32bit}) // synthesis parallel_case
        {2'd0, 3'b100} : wb_sel_dsff[3:0] <=  4'h8;
        {2'd0, 3'b010} : wb_sel_dsff[3:0] <=  4'hC;
        {2'd0, 3'b001} : wb_sel_dsff[3:0] <=  4'hF;
        {2'd1, 3'b100} : wb_sel_dsff[3:0] <=  4'h4;
        {2'd2, 3'b100} : wb_sel_dsff[3:0] <=  4'h2;
        {2'd2, 3'b010} : wb_sel_dsff[3:0] <=  4'h3;
        {2'd3, 3'b100} : wb_sel_dsff[3:0] <=  4'h1;
        default:         wb_sel_dsff[3:0] <=  4'hx;
      endcase
    end
end
 
 
assign wb_sel_o = wb_sel_dsff;
 
/*
always @ (posedge wb_clk_i)
begin
  wb_we_dsff <=  curr_cmd_go && acc_type_write;
end
*/
 
always @ (posedge wb_clk_i or posedge rst_i)
begin
  if (rst_i)
     wb_we_dsff <=  1'b0;
  else if ((start_wb_wr && (!start_wb_wr_q)))
    wb_we_dsff <=  1'b1;
  else if (wb_ack_i || wb_err_i)
    wb_we_dsff <=  1'b0;
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'b0;
  else if (wb_ack_i || wb_err_i)
    wb_end <=  1'b1;
  else if (wb_end_rst)
    wb_end <=  1'b0;
end
 
 
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    begin
      wb_end_csff  <=  1'b0;
      wb_end_tck   <=  1'b0;
      wb_end_tck_q <=  1'b0;
    end
  else
    begin
      wb_end_csff  <=  wb_end;
      wb_end_tck   <=  wb_end_csff;
      wb_end_tck_q <=  wb_end_tck;
    end
end
 
 
always @ (posedge wb_clk_i or posedge rst_i)
begin
  if (rst_i)
    begin
      wb_end_rst_csff <=  1'b0;
      wb_end_rst      <=  1'b0;
    end
  else
    begin
      wb_end_rst_csff <=  wb_end_tck;
      wb_end_rst      <=  wb_end_rst_csff;
    end
end
 
 
always @ (posedge wb_clk_i or posedge rst_i)
begin
  if (rst_i)
    busy_wb <=  1'b0;
  else if (wb_end_rst)
    busy_wb <=  1'b0;
  else if (wb_cyc_o)
    busy_wb <=  1'b1;
end
 
 
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    begin
      busy_csff       <=  1'b0;
      busy_tck        <=  1'b0;
 
      update_dr_csff  <=  1'b0;
      update_dr_wb    <=  1'b0;
    end
  else
    begin
      busy_csff       <=  busy_wb;
      busy_tck        <=  busy_csff;
 
      update_dr_csff  <=  update_dr_i;
      update_dr_wb    <=  update_dr_csff;
    end
end
 
 
// Detecting WB error
always @ (posedge wb_clk_i or posedge rst_i)
begin
  if (rst_i)
    wb_error <=  1'b0;
  else if(wb_err_i)
    wb_error <=  1'b1;
  else if(update_dr_wb) // error remains active until update_dr arrives
    wb_error <=  1'b0;
end
 
 
// Detecting overrun when write operation.
always @ (posedge wb_clk_i or posedge rst_i)
begin
  if (rst_i)
    wb_overrun <=  1'b0;
  else if(start_wb_wr && (!start_wb_wr_q) && wb_cyc_o)
    wb_overrun <=  1'b1;
  else if(update_dr_wb) // error remains active until update_dr arrives
    wb_overrun <=  1'b0;
end
 
 
// Detecting underrun when read operation
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    underrun_tck <=  1'b0;
  else if(latch_data && fifo_empty && (!data_cnt_end))
    underrun_tck <=  1'b1;
  else if(update_dr_i) // error remains active until update_dr arrives
    underrun_tck <=  1'b0;
end
 
 
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    begin
      wb_error_csff   <=  1'b0;
      wb_error_tck    <=  1'b0;
 
      wb_overrun_csff <=  1'b0;
      wb_overrun_tck  <=  1'b0;
    end
  else
    begin
      wb_error_csff   <=  wb_error;
      wb_error_tck    <=  wb_error_csff;
 
      wb_overrun_csff <=  wb_overrun;
      wb_overrun_tck  <=  wb_overrun_csff;
    end
end
 
 
 
always @ (posedge wb_clk_i or posedge rst_i)
begin
  if (rst_i)
    begin
      wishbone_ce_csff  <=  1'b0;
      mem_ptr_init      <=  1'b0;
    end
  else
    begin
      wishbone_ce_csff  <=   wishbone_ce_i;
      mem_ptr_init      <=  ~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 <=  3'h0;
  else if(mem_ptr_init)
    mem_ptr_dsff <=  3'h0;
  else if (wb_ack_i)
    begin
      if (acc_type == `DBG_WB_READ8)
        mem_ptr_dsff <=  mem_ptr_dsff + 3'd1;
      else if (acc_type == `DBG_WB_READ16)
        mem_ptr_dsff <=  mem_ptr_dsff + 3'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
        4'b1000  :  mem[mem_ptr_dsff[1:0]] <=  wb_dat_i[31:24];// byte
        4'b0100  :  mem[mem_ptr_dsff[1:0]] <=  wb_dat_i[23:16];// byte
        4'b0010  :  mem[mem_ptr_dsff[1:0]] <=  wb_dat_i[15:08];// byte
        4'b0001  :  mem[mem_ptr_dsff[1:0]] <=  wb_dat_i[07:00];// byte
 
        4'b1100  :                                                  // half
                    begin
                      mem[mem_ptr_dsff[1:0]]      <=  wb_dat_i[31:24];
                      mem[mem_ptr_dsff[1:0]+1'b1] <=  wb_dat_i[23:16];
                    end
        4'b0011  :                                                      // half
                    begin
                      mem[mem_ptr_dsff[1:0]]      <=  wb_dat_i[15:08];
                      mem[mem_ptr_dsff[1:0]+1'b1] <=  wb_dat_i[07:00];
                    end
        /*4'b1111  :                                                      // long*/
        default:
                    begin
                      mem[0] <=  wb_dat_i[31:24];
                      mem[1] <=  wb_dat_i[23:16];
                      mem[2] <=  wb_dat_i[15:08];
                      mem[3] <=  wb_dat_i[07:00];
                    end
        /*
        default  :                                                      // long
                    begin
                      mem[0] <=  8'hxx;
                      mem[1] <=  8'hxx;
                      mem[2] <=  8'hxx;
                      mem[3] <=  8'hxx;
                    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 <=  3'h0;
  else if (update_dr_i)
    fifo_cnt <=  3'h0;
  else if (wb_end_tck && (!wb_end_tck_q) && (!latch_data) && (!fifo_full))  // incrementing
    begin
      case (acc_type)  // synthesis parallel_case
        `DBG_WB_READ8 : fifo_cnt <=  fifo_cnt + 3'd1;
        `DBG_WB_READ16: fifo_cnt <=  fifo_cnt + 3'd2;
        `DBG_WB_READ32: fifo_cnt <=  fifo_cnt + 3'd4;
        default:        fifo_cnt <=  3'bxxx;
      endcase
    end
  else if (!(wb_end_tck && (!wb_end_tck_q)) && latch_data && (!fifo_empty))  // decrementing
    begin
      case (acc_type)  // synthesis parallel_case
        `DBG_WB_READ8 : fifo_cnt <=  fifo_cnt - 3'd1;
        `DBG_WB_READ16: fifo_cnt <=  fifo_cnt - 3'd2;
        `DBG_WB_READ32: fifo_cnt <=  fifo_cnt - 3'd4;
        default:        fifo_cnt <=  3'bxxx;
      endcase
    end
end
 
 
assign fifo_full  = fifo_cnt == 3'h4;
assign fifo_empty = fifo_cnt == 3'h0;
 
 
// 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_rd_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;
    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;
    end
  else if (curr_cmd_go && acc_type_read && crc_cnt_end && (!data_cnt_end))
    begin
      tdo_o = dr[31];
    end
  else if (curr_cmd_go && acc_type_read && data_cnt_end && (!data_cnt_end_q))
    begin
      tdo_o = ~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;
    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];
    end
  else if (status_cnt_en)
    begin
      tdo_o = status[3];
    end
  else
    begin
      tdo_o = 1'b0;
    end
end
 
// Status register
always @ (posedge tck_i or posedge rst_i)
begin
  if (rst_i)
    begin
    status <=  {`DBG_WB_STATUS_LEN{1'b0}};
    end
  else if(crc_cnt_end && (!crc_cnt_end_q) && (!(curr_cmd_go && acc_type_read)))
    begin
    status <=  {1'b0, wb_error_tck, wb_overrun_tck, crc_match_i};
    end
  else if (data_cnt_end && (!data_cnt_end_q) && curr_cmd_go && acc_type_read)
    begin
    status <=  {1'b0, wb_error_tck, underrun_tck, crc_match_reg};
    end
  else if (addr_len_cnt_end && (!addr_len_cnt_end) && curr_cmd_rd_comm)
    begin
    status <=  {1'b0, 1'b0, 1'b0, crc_match_reg};
    end
  else if (shift_dr_i && (!status_cnt_end))
    begin
    status <=  {status[`DBG_WB_STATUS_LEN -2:0], status[`DBG_WB_STATUS_LEN -1]};
    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	6	julius	`//////////////////////////////////////////////////////////////////////`
2			`//// ////`
3			`//// dbg_wb.v ////`
4			`//// ////`
5			`//// ////`
6			`//// This file is part of the SoC Debug 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 - 2004 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			`// synopsys translate_off`
44			`include "timescale.v"
45			`// synopsys translate_on`
46			`include "dbg_wb_defines.v"
47
48			`// Top module`
49			`module dbg_wb(`
50			`// JTAG signals`
51			`tck_i,`
52			`tdi_i,`
53			`tdo_o,`
54
55			`// TAP states`
56			`shift_dr_i,`
57			`pause_dr_i,`
58			`update_dr_i,`
59
60			`wishbone_ce_i,`
61			`crc_match_i,`
62			`crc_en_o,`
63			`shift_crc_o,`
64			`rst_i,`
65
66			`// WISHBONE common signals`
67			`wb_clk_i,`
68
69			`// WISHBONE master interface`
70			`wb_adr_o, wb_dat_o, wb_dat_i, wb_cyc_o, wb_stb_o, wb_sel_o,`
71			`wb_we_o, wb_ack_i, wb_cab_o, wb_err_i, wb_cti_o, wb_bte_o`
72
73			`);`
74
75			`// JTAG signals`
76			`input tck_i;`
77			`input tdi_i;`
78			`output tdo_o;`
79
80			`// TAP states`
81			`input shift_dr_i;`
82			`input pause_dr_i;`
83			`input update_dr_i;`
84
85			`input wishbone_ce_i;`
86			`input crc_match_i;`
87			`output crc_en_o;`
88			`output shift_crc_o;`
89			`input rst_i;`
90			`// WISHBONE common signals`
91			`input wb_clk_i;`
92
93			`// WISHBONE master interface`
94			`output [31:0] wb_adr_o;`
95			`output [31:0] wb_dat_o;`
96			`input [31:0] wb_dat_i;`
97			`output wb_cyc_o;`
98			`output wb_stb_o;`
99			`output [3:0] wb_sel_o;`
100			`output wb_we_o;`
101			`input wb_ack_i;`
102			`output wb_cab_o;`
103			`input wb_err_i;`
104			`output [2:0] wb_cti_o;`
105			`output [1:0] wb_bte_o;`
106
107			`reg wb_cyc_o;`
108
109			`reg tdo_o;`
110
111			`reg [31:0] wb_dat_tmp, wb_dat_dsff;`
112			`reg [31:0] wb_adr_dsff;`
113			`reg [3:0] wb_sel_dsff;`
114			`reg wb_we_dsff;`
115			reg [`DBG_WB_DR_LEN -1 :0] dr;
116			`wire enable;`
117			`wire cmd_cnt_en;`
118			reg [`DBG_WB_CMD_CNT_WIDTH -1:0] cmd_cnt;
119			`wire cmd_cnt_end;`
120			`reg cmd_cnt_end_q;`
121			`reg addr_len_cnt_en;`
122			`reg [5:0] addr_len_cnt;`
123			`wire addr_len_cnt_end;`
124			`reg addr_len_cnt_end_q;`
125			`reg crc_cnt_en;`
126			reg [`DBG_WB_CRC_CNT_WIDTH -1:0] crc_cnt;
127			`wire crc_cnt_end;`
128			`reg crc_cnt_end_q;`
129			`reg data_cnt_en;`
130			reg [`DBG_WB_DATA_CNT_WIDTH:0] data_cnt;
131			reg [`DBG_WB_DATA_CNT_LIM_WIDTH:0] data_cnt_limit;
132			`wire data_cnt_end;`
133			`reg data_cnt_end_q;`
134
135			`reg crc_match_reg;`
136
137			reg [`DBG_WB_ACC_TYPE_LEN -1:0] acc_type;
138			reg [`DBG_WB_ADR_LEN -1:0] adr;
139			reg [`DBG_WB_LEN_LEN -1:0] len;
140			reg [`DBG_WB_LEN_LEN:0] len_var;
141			`reg start_rd_tck;`
142			`reg rd_tck_started;`
143			`reg start_rd_csff;`
144			`reg start_wb_rd;`
145			`reg start_wb_rd_q;`
146			`reg start_wr_tck;`
147			`reg start_wr_csff;`
148			`reg start_wb_wr;`
149			`reg start_wb_wr_q;`
150
151			`reg status_cnt_en;`
152			`wire status_cnt_end;`
153
154			`wire byte, half, long;`
155			`reg byte_q, half_q, long_q;`
156
157			reg [`DBG_WB_STATUS_CNT_WIDTH -1:0] status_cnt;
158
159			reg [`DBG_WB_STATUS_LEN -1:0] status;
160
161			`reg wb_error, wb_error_csff, wb_error_tck;`
162			`reg wb_overrun, wb_overrun_csff, wb_overrun_tck;`
163			`reg underrun_tck;`
164
165			`reg busy_wb;`
166			`reg busy_tck;`
167			`reg wb_end;`
168			`reg wb_end_rst;`
169			`reg wb_end_rst_csff;`
170			`reg wb_end_csff;`
171			`reg wb_end_tck, wb_end_tck_q;`
172			`reg busy_csff;`
173			`reg latch_data;`
174			`reg update_dr_csff, update_dr_wb;`
175
176			`reg set_addr, set_addr_csff, set_addr_wb, set_addr_wb_q;`
177			`wire [31:0] input_data;`
178
179			`wire len_eq_0;`
180			`wire crc_cnt_31;`
181
182			`reg [1:0] ptr;`
183			`reg [2:0] fifo_cnt;`
184			`wire fifo_full;`
185			`wire fifo_empty;`
186			`reg [7:0] mem [0:3];`
187			`reg [2:0] mem_ptr_dsff;`
188			`reg wishbone_ce_csff;`
189			`reg mem_ptr_init;`
190	363	julius	reg [`DBG_WB_CMD_LEN_INT -1: 0] curr_cmd;
191	6	julius	`wire curr_cmd_go;`
192			`reg curr_cmd_go_q;`
193			`wire curr_cmd_wr_comm;`
194			`wire curr_cmd_rd_comm;`
195			`wire acc_type_read;`
196			`wire acc_type_write;`
197			`wire acc_type_8bit;`
198			`wire acc_type_16bit;`
199			`wire acc_type_32bit;`
200
201
202			`assign enable = wishbone_ce_i & shift_dr_i;`
203			`assign crc_en_o = enable & crc_cnt_end & (~status_cnt_end);`
204			`assign shift_crc_o = enable & status_cnt_end; // Signals dbg module to shift out the CRC`
205
206			assign curr_cmd_go = (curr_cmd == `DBG_WB_GO) && cmd_cnt_end;
207			assign curr_cmd_wr_comm = (curr_cmd == `DBG_WB_WR_COMM) && cmd_cnt_end;
208			assign curr_cmd_rd_comm = (curr_cmd == `DBG_WB_RD_COMM) && cmd_cnt_end;
209
210			assign acc_type_read = (acc_type == `DBG_WB_READ8 \|\| acc_type == `DBG_WB_READ16 \|\| acc_type == `DBG_WB_READ32);
211			assign acc_type_write = (acc_type == `DBG_WB_WRITE8 \|\| acc_type == `DBG_WB_WRITE16 \|\| acc_type == `DBG_WB_WRITE32);
212
213			assign acc_type_8bit = (acc_type == `DBG_WB_READ8 \|\| acc_type == `DBG_WB_WRITE8);
214			assign acc_type_16bit = (acc_type == `DBG_WB_READ16 \|\| acc_type == `DBG_WB_WRITE16);
215			assign acc_type_32bit = (acc_type == `DBG_WB_READ32 \|\| acc_type == `DBG_WB_WRITE32);
216
217
218			`// Selecting where to take the data from`
219			`always @ (posedge tck_i or posedge rst_i)`
220			`begin`
221			`if (rst_i)`
222	360	julius	`ptr <= 2'h0;`
223	6	julius	`else if (update_dr_i)`
224	360	julius	`ptr <= 2'h0;`
225	6	julius	`else if (curr_cmd_go && acc_type_read && crc_cnt_31) // first latch`
226	360	julius	`ptr <= ptr + 1'b1;`
227	6	julius	`else if (curr_cmd_go && acc_type_read && byte && (!byte_q))`
228			`ptr <= ptr + 1'd1;`
229			`end`
230
231
232			`// Shift register for shifting in and out the data`
233			`always @ (posedge tck_i or posedge rst_i)`
234			`begin`
235			`if (rst_i)`
236			`begin`
237	360	julius	`latch_data <= 1'b0;`
238			dr <= {`DBG_WB_DR_LEN{1'b0}};
239	6	julius	`end`
240			`else if (curr_cmd_rd_comm && crc_cnt_31) // Latching data (from iternal regs)`
241			`begin`
242	360	julius	dr[`DBG_WB_ACC_TYPE_LEN + `DBG_WB_ADR_LEN + `DBG_WB_LEN_LEN -1:0] <= {acc_type, adr, len};
243	6	julius	`end`
244	547	julius	`else if (acc_type_read && curr_cmd_go && crc_cnt_31 && !busy_tck) // Latchind first data (from WB)`
245	6	julius	`begin`
246	360	julius	`dr[31:0] <= input_data[31:0];`
247			`latch_data <= 1'b1;`
248	6	julius	`end`
249	547	julius	`else if (acc_type_read && curr_cmd_go && crc_cnt_end && !busy_tck && wb_end_tck_q)`
250	6	julius	`begin`
251	547	julius	`// Had to wait for data from WB.`
252			`dr[31:0] <= input_data[31:0];`
253			`latch_data <= 1'b1;`
254			`end`
255			`else if (acc_type_read && curr_cmd_go && crc_cnt_end && !busy_tck) // Latching data (from WB)`
256			`begin`
257	6	julius	if (acc_type == `DBG_WB_READ8)
258			`begin`
259			`if(byte & (~byte_q))`
260			`begin`
261			`case (ptr) // synthesis parallel_case`
262	360	julius	`2'b00 : dr[31:24] <= input_data[31:24];`
263			`2'b01 : dr[31:24] <= input_data[23:16];`
264			`2'b10 : dr[31:24] <= input_data[15:8];`
265			`2'b11 : dr[31:24] <= input_data[7:0];`
266	6	julius	`endcase`
267	360	julius	`latch_data <= 1'b1;`
268	6	julius	`end`
269			`else`
270			`begin`
271	46	julius	`if (enable) // jb`
272	360	julius	`dr[31:24] <= {dr[30:24], 1'b0};`
273			`latch_data <= 1'b0;`
274	6	julius	`end`
275			`end`
276			else if (acc_type == `DBG_WB_READ16)
277			`begin`
278			`if(half & (~half_q))`
279			`begin`
280			`if (ptr[1])`
281	360	julius	`dr[31:16] <= input_data[15:0];`
282	6	julius	`else`
283	360	julius	`dr[31:16] <= input_data[31:16];`
284			`latch_data <= 1'b1;`
285	6	julius	`end`
286			`else`
287			`begin`
288	46	julius	`if (enable) // jb`
289	360	julius	`dr[31:16] <= {dr[30:16], 1'b0};`
290			`latch_data <= 1'b0;`
291	6	julius	`end`
292			`end`
293			else if (acc_type == `DBG_WB_READ32)
294			`begin`
295			`if(long & (~long_q))`
296			`begin`
297	360	julius	`dr[31:0] <= input_data[31:0];`
298			`latch_data <= 1'b1;`
299	6	julius	`end`
300			`else`
301			`begin`
302	46	julius	`if (enable) // jb`
303	360	julius	`dr[31:0] <= {dr[30:0], 1'b0};`
304			`latch_data <= 1'b0;`
305	6	julius	`end`
306			`end`
307			`end`
308			`else if (enable && (!addr_len_cnt_end))`
309			`begin`
310	360	julius	dr <= {dr[`DBG_WB_DR_LEN -2:0], tdi_i};
311	6	julius	`end`
312			`end`
313
314
315
316			`assign cmd_cnt_en = enable & (~cmd_cnt_end);`
317
318
319			`// Command counter`
320			`always @ (posedge tck_i or posedge rst_i)`
321			`begin`
322			`if (rst_i)`
323	360	julius	cmd_cnt <= {`DBG_WB_CMD_CNT_WIDTH{1'b0}};
324	6	julius	`else if (update_dr_i)`
325	360	julius	cmd_cnt <= {`DBG_WB_CMD_CNT_WIDTH{1'b0}};
326	6	julius	`else if (cmd_cnt_en)`
327	363	julius	cmd_cnt <= cmd_cnt + `DBG_WB_CMD_CNT_WIDTH'd1;
328	6	julius	`end`
329
330
331			`// Assigning current command`
332			`always @ (posedge tck_i or posedge rst_i)`
333			`begin`
334			`if (rst_i)`
335	363	julius	curr_cmd <= {`DBG_WB_CMD_LEN_INT{1'b0}};
336	6	julius	`else if (update_dr_i)`
337	363	julius	curr_cmd <= {`DBG_WB_CMD_LEN_INT{1'b0}};
338			else if (cmd_cnt == (`DBG_WB_CMD_LEN_INT -1))
339			curr_cmd <= {dr[`DBG_WB_CMD_LEN_INT-2 :0], tdi_i};
340	6	julius	`end`
341
342
343			`// Assigning current command`
344			`always @ (posedge tck_i or posedge rst_i)`
345			`begin`
346			`if (rst_i)`
347	360	julius	`curr_cmd_go_q <= 1'b0;`
348	6	julius	`else`
349	360	julius	`curr_cmd_go_q <= curr_cmd_go;`
350	6	julius	`end`
351
352
353			`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)`
354			`begin`
355			`if (enable && (!addr_len_cnt_end))`
356			`begin`
357			`if (cmd_cnt_end && curr_cmd_wr_comm)`
358			`addr_len_cnt_en = 1'b1;`
359			`else if (crc_cnt_end && curr_cmd_rd_comm)`
360			`addr_len_cnt_en = 1'b1;`
361			`else`
362			`addr_len_cnt_en = 1'b0;`
363			`end`
364			`else`
365			`addr_len_cnt_en = 1'b0;`
366			`end`
367
368
369			`// Address/length counter`
370			`always @ (posedge tck_i or posedge rst_i)`
371			`begin`
372			`if (rst_i)`
373	363	julius	`addr_len_cnt <= 6'd0;`
374	6	julius	`else if (update_dr_i)`
375	363	julius	`addr_len_cnt <= 6'd0;`
376	6	julius	`else if (addr_len_cnt_en)`
377	363	julius	`addr_len_cnt <= addr_len_cnt + 6'd1;`
378	6	julius	`end`
379
380
381			`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)`
382			`begin`
383			`if (enable && (!data_cnt_end))`
384			`begin`
385			`if (cmd_cnt_end && curr_cmd_go && acc_type_write)`
386			`data_cnt_en = 1'b1;`
387			`else if (crc_cnt_end && curr_cmd_go && acc_type_read)`
388			`data_cnt_en = 1'b1;`
389			`else`
390			`data_cnt_en = 1'b0;`
391			`end`
392			`else`
393			`data_cnt_en = 1'b0;`
394			`end`
395
396
397			`// Data counter`
398			`always @ (posedge tck_i or posedge rst_i)`
399			`begin`
400			`if (rst_i)`
401	363	julius	data_cnt <= {`DBG_WB_DATA_CNT_WIDTH+1{1'b0}};
402	6	julius	`else if (update_dr_i)`
403	363	julius	data_cnt <= {`DBG_WB_DATA_CNT_WIDTH+1{1'b0}};
404	6	julius	`else if (data_cnt_en)`
405	363	julius	`data_cnt <= data_cnt + 1;`
406	6	julius	`end`
407
408
409
410			`// Upper limit. Data counter counts until this value is reached.`
411			`always @ (posedge tck_i or posedge rst_i)`
412			`begin`
413			`if (rst_i)`
414	363	julius	data_cnt_limit <= {`DBG_WB_DATA_CNT_LIM_WIDTH+1{1'b0}};
415	6	julius	`else if (update_dr_i)`
416	363	julius	`data_cnt_limit <= len + 1;`
417	6	julius	`end`
418
419
420			`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)`
421			`begin`
422			`if (enable && (!crc_cnt_end) && cmd_cnt_end)`
423			`begin`
424			`if (addr_len_cnt_end && curr_cmd_wr_comm)`
425			`crc_cnt_en = 1'b1;`
426			`else if (data_cnt_end && curr_cmd_go && acc_type_write)`
427			`crc_cnt_en = 1'b1;`
428			`else if (cmd_cnt_end && (curr_cmd_go && acc_type_read \|\| curr_cmd_rd_comm))`
429			`crc_cnt_en = 1'b1;`
430			`else`
431			`crc_cnt_en = 1'b0;`
432			`end`
433			`else`
434			`crc_cnt_en = 1'b0;`
435			`end`
436	46	julius
437	6	julius
438			`// crc counter`
439			`always @ (posedge tck_i or posedge rst_i)`
440			`begin`
441			`if (rst_i)`
442	360	julius	crc_cnt <= {`DBG_WB_CRC_CNT_WIDTH{1'b0}};
443	6	julius	`else if(crc_cnt_en)`
444	363	julius	`crc_cnt <= crc_cnt + 1;`
445	6	julius	`else if (update_dr_i)`
446	360	julius	crc_cnt <= {`DBG_WB_CRC_CNT_WIDTH{1'b0}};
447	6	julius	`end`
448
449			assign cmd_cnt_end = cmd_cnt == `DBG_WB_CMD_LEN;
450			assign addr_len_cnt_end = addr_len_cnt == `DBG_WB_DR_LEN;
451			assign crc_cnt_end = crc_cnt == `DBG_WB_CRC_CNT_WIDTH'd32;
452			assign crc_cnt_31 = crc_cnt == `DBG_WB_CRC_CNT_WIDTH'd31;
453			`assign data_cnt_end = (data_cnt == {data_cnt_limit, 3'b000});`
454
455			`always @ (posedge tck_i or posedge rst_i)`
456			`begin`
457			`if (rst_i)`
458			`begin`
459	360	julius	`crc_cnt_end_q <= 1'b0;`
460			`cmd_cnt_end_q <= 1'b0;`
461			`data_cnt_end_q <= 1'b0;`
462			`addr_len_cnt_end_q <= 1'b0;`
463	6	julius	`end`
464			`else`
465			`begin`
466	360	julius	`crc_cnt_end_q <= crc_cnt_end;`
467			`cmd_cnt_end_q <= cmd_cnt_end;`
468			`data_cnt_end_q <= data_cnt_end;`
469			`addr_len_cnt_end_q <= addr_len_cnt_end;`
470	6	julius	`end`
471			`end`
472
473
474			`// Status counter is made of 4 serialy connected registers`
475			`always @ (posedge tck_i or posedge rst_i)`
476			`begin`
477			`if (rst_i)`
478	360	julius	status_cnt <= {`DBG_WB_STATUS_CNT_WIDTH{1'b0}};
479	6	julius	`else if (update_dr_i)`
480	360	julius	status_cnt <= {`DBG_WB_STATUS_CNT_WIDTH{1'b0}};
481	6	julius	`else if (status_cnt_en)`
482	363	julius	status_cnt <= status_cnt + `DBG_WB_STATUS_CNT_WIDTH'd1;
483	6	julius	`end`
484
485
486			`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 acc_type_read or data_cnt_end or addr_len_cnt_end)`
487			`begin`
488			`if (enable && (!status_cnt_end))`
489			`begin`
490			`if (crc_cnt_end && curr_cmd_wr_comm)`
491			`status_cnt_en = 1'b1;`
492			`else if (crc_cnt_end && curr_cmd_go && acc_type_write)`
493			`status_cnt_en = 1'b1;`
494			`else if (data_cnt_end && curr_cmd_go && acc_type_read)`
495			`status_cnt_en = 1'b1;`
496			`else if (addr_len_cnt_end && curr_cmd_rd_comm)`
497			`status_cnt_en = 1'b1;`
498			`else`
499			`status_cnt_en = 1'b0;`
500			`end`

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[/] [openrisc/] [trunk/] [orpsocv2/] [rtl/] [verilog/] [dbg_if/] [dbg_wb.v] - Blame information for rev 862