//////////////////////////////////////////////////////////////////////////////////                __     ___ _               ___ ____                         ////                \ \   / (_) |__   ___  ___|_ _/ ___|                        ////                 \ \ / /| | '_ \ / _ \/ __|| | |                            ////                  \ V / | | |_) |  __/\__ \| | |___                         ////                   \_/  |_|_.__/ \___||___/___\____|                        ////                                                                            //////////////////////////////////////////////////////////////////////////////////// 	   Copyright (C) 2003-2006 VibesIC, Inc.   All rights reserved.           ////----------------------------------------------------------------------------//// This source code is provided by VibesIC,and be verified on VibesIC FPGA    //// development kit. The source code 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 SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED     //// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF       //// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE//// AUTHOR 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.                                 ////----------------------------------------------------------------------------//// 本設計由威百仕( VibesIC )提供，并在其產品中驗證通過，您可以在此基礎上修改，//// 復制并分發,但請您保留版權聲明部分。我們并不承諾本設計可以用做商業產品，同時//// 我們不保證設計的通用性。為了方便更新以及修改請保留設計的版本信息，并對自行 //// 修改部分添加足夠的注釋。對設計如有其他建議,請到網站進行討論。              ////                                                                            ////////////////////////////////////////////////////////////////////////////////////  Company:       www.richic.com                                             ////  Company bbs:   www.edacn.net                                              ////  Engineer:      alex_yang                                                  ////                                                                            ////  Target Device: XC3S400-PQ208                                              ////  Tool versions: Simulation:    ModelSim SE 6.2a                            ////                 Synthesis:     XST(ise8.1...sp3)                           ////                 Place&Routing: ISE8.1...sp3                                ////                 Others tools:  UltraEdit-32 12.10a                         ////  Create Date:   2006-10-21 12:29                                           ////  Description:                                                              ////                                                                            ////  LOG:                                                                      ////       1. Revision 1.0 (Initial version)  2006-10-21 12:29  alex_yang       ////                                                                            ////       2. Revision 1.1  2006-12-25 10:35   alex_yang                        ////          Modify for VX-SP306                                               //////////////////////////////////////////////////////////////////////////////////`timescale 1ns/1nsmodule ps2_keyboard_top(	                  clk,	                  rst_n,	                  ps2_clk,                    ps2_data,                     rs232_r1,                    rs232_t1                    );input	    clk;input	    rst_n;inout     ps2_clk;inout     ps2_data;input     rs232_r1;  output    rs232_t1;wire [4:0] ps2_status;wire [2:0] rs232_rx_error;wire ps2_key_data_ready;wire ps2_key_released;wire ps2_key_pressed = ~ps2_key_released;wire rx232_tx_load_request;wire rs232_rx_data_ready;wire [7:0] ps2_ascii;wire [7:0] rs232_rx_character;  //-----------------------------------------------------------    ps2_keyboard           #(3000, // number of clks for 60usec.                         12,   // number of bits needed for 60usec. timer                         186,  // number of clks for debounce                         8,    // number of bits needed for debounce timer                         1     // Trap the shift keys, no event generated                         )                         keyboard1_block (            // Instance name  .clk(clk),  .reset(!rst_n),  .ps2_clk(ps2_clk),  .ps2_data(ps2_data),  .rx_extended(ps2_status[1]),  .rx_released(ps2_key_released),  .rx_shift_key_on(ps2_status[3]),  .rx_scan_code(),  .rx_ascii(ps2_ascii),  .rx_data_ready(ps2_key_data_ready),  .rx_read(ps2_key_data_ready),  .tx_data({rs232_rx_character[5],        // Make upper nibble E, F or 0            rs232_rx_character[5],            rs232_rx_character[5],            rs232_rx_character[4],            rs232_rx_character[3:0]}),  .tx_write(rs232_rx_data_ready),  .tx_write_ack_o(ps2_tx_write_ack_o),  .tx_error_no_keyboard_ack(ps2_status[4])  );assign ps2_status[2] = ps2_key_released;assign ps2_status[0] = rs232_rx_data_ready;// These defines are for the rs232 interface`define START_BITS 1`define DATA_BITS 8`define STOP_BITS 1`define CLOCK_FACTOR 16// This unit generates the correct 16x transmit clock (enable) frequency// which is used for the serial transmit operation.clock_gen_select clock_unit  (   .clk(clk),   .reset(!rst_n),   .rate_select(3'b100),         // 115,200 baud   .clk_out(serial_clk_16x)  );// A transmitter, which asserts load_request at the end of the currently// transmitted word.  The tx_clk must be a "clock enable" (narrow positive// pulse) which occurs at 16x the desired transmit rate.  If load_request// is connected directly to load, the unit will transmit continuously.rs232tx #(          `START_BITS,   // start_bits          `DATA_BITS,    // data_bits          `STOP_BITS,    // stop_bits (add intercharacter delay...)          `CLOCK_FACTOR  // clock_factor         )         rs232_tx_block // instance name         (           .clk(clk),          .tx_clk(serial_clk_16x),          .reset(!rst_n),          .load(   ps2_key_data_ready                && ps2_key_pressed                && rs232_tx_load_request),          .data(ps2_ascii),                 // Connected from keyboard          .load_request(rs232_tx_load_request),          .txd(rs232_t1)         );// A receiver, which asserts "word_ready" to indicate a received word.// Asserting "read_word" will cause "word_ready" to go low again if it was high.// The character is held in the output register, during the time the next//   character is coming in.rs232rx #(          `START_BITS,  // start_bits          `DATA_BITS,   // data_bits          `STOP_BITS,   // stop_bits          `CLOCK_FACTOR // clock_factor         )         rs232_rx_block // instance name         (           .clk(clk),          .rx_clk(serial_clk_16x),          .reset((!rst_n) || (| rs232_rx_error) ),          .rxd(rs232_r1),          .read(ps2_tx_write_ack_o),          .data(rs232_rx_character),          .data_ready(rs232_rx_data_ready),          .error_over_run(rs232_rx_error[0]),          .error_under_run(rs232_rx_error[1]),          .error_all_low(rs232_rx_error[2])         );//`undef START_BITS //`undef DATA_BITS //`undef STOP_BITS //`undef CLOCK_FACTOR      endmodule