Subversion Repositories wb4pb

////////////////////////////////////////////////////////////////////////////////
// This sourcecode is released under BSD license.
// Please see http://www.opensource.org/licenses/bsd-license.php for details!
////////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2010, Stefan Fischer <Ste.Fis@OpenCores.org>
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without 
// modification, are permitted provided that the following conditions are met:
//
//  * Redistributions of source code must retain the above copyright notice, 
//    this list of conditions and the following disclaimer.
//  * Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
// POSSIBILITY OF SUCH DAMAGE.
//
////////////////////////////////////////////////////////////////////////////////
// filename: picoblaze_wb_uart.v
// description: synthesizable PicoBlaze (TM) uart example using wishbone
// todo4user: add other modules as needed
// version: 0.0.0
// changelog: - 0.0.0, initial release
//            - ...
////////////////////////////////////////////////////////////////////////////////
 
 
module picoblaze_wb_uart (
  p_rst_n_i,
  p_clk_i,
 
  p_uart_rx_si_i,
  p_uart_tx_so_o
);
 
  input p_rst_n_i;
  wire  p_rst_n_i;
  input p_clk_i;
  wire  p_clk_i;
 
  input p_uart_rx_si_i;
  wire  p_uart_rx_si_i;
  output p_uart_tx_so_o;
  wire   p_uart_tx_so_o;
 
  reg rst;
  wire clk;
 
  wire wb_cyc;
  wire wb_stb;
  wire wb_we;
  wire[7:0] wb_adr;
  wire[7:0] wb_dat_m2s;
  wire[7:0] wb_dat_s2m;
  wire wb_ack;
 
  wire pb_write_strobe;
  wire pb_read_strobe;
  wire[7:0] pb_port_id;
  wire[7:0] pb_in_port;
  wire[7:0] pb_out_port;
 
  wire[17:0] instruction;
  wire[9:0] address;
 
  wire interrupt;
  wire interrupt_ack;
 
  // reset synchronisation
  always@(posedge clk)
    rst <= ! p_rst_n_i;
  assign clk = p_clk_i;
 
  // module instances
  ///////////////////
 
  kcpsm3 inst_kcpsm3 (
    .address(address),
    .instruction(instruction),
    .port_id(pb_port_id),
    .write_strobe(pb_write_strobe),
    .out_port(pb_out_port),
    .read_strobe(pb_read_strobe),
    .in_port(pb_in_port),
    .interrupt(interrupt),
    .interrupt_ack(interrupt_ack),
    .reset(rst),
    .clk(clk)
  );
 
  pbwbuart inst_pbwbuart (
    .address(address),
    .instruction(instruction),
    .clk(clk)
  );
 
  wbm_picoblaze inst_wbm_picoblaze (
    .rst(rst),
    .clk(clk),
 
    .wbm_cyc_o(wb_cyc),
    .wbm_stb_o(wb_stb),
    .wbm_we_o(wb_we),
    .wbm_adr_o(wb_adr),
    .wbm_dat_m2s_o(wb_dat_m2s),
    .wbm_dat_s2m_i(wb_dat_s2m),
    .wbm_ack_i(wb_ack),
 
    .pb_port_id_i(pb_port_id),
    .pb_write_strobe_i(pb_write_strobe),
    .pb_out_port_i(pb_out_port),
    .pb_read_strobe_i(pb_read_strobe),
    .pb_in_port_o(pb_in_port)
  );
 
  wbs_uart inst_wbs_uart (
    .rst(rst),
    .clk(clk),
 
    .wbs_cyc_i(wb_cyc),
    .wbs_stb_i(wb_stb),
    .wbs_we_i(wb_we),
    .wbs_adr_i(wb_adr),
    .wbs_dat_m2s_i(wb_dat_m2s),
    .wbs_dat_s2m_o(wb_dat_s2m),
    .wbs_ack_o(wb_ack),
 
    .uart_rx_si_i(p_uart_rx_si_i),
    .uart_tx_so_o(p_uart_tx_so_o)
  );
 
endmodule