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lampret |
//////////////////////////////////////////////////////////////////////
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//// ////
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//// ps2_io_ctrl.v ////
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//// ////
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//// This file is part of the "ps2" project ////
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//// http://www.opencores.org/cores/ps2/ ////
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//// ////
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//// Author(s): ////
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//// - mihad@opencores.org ////
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//// - Miha Dolenc ////
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//// ////
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//// All additional information is avaliable in the README.txt ////
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//// file. ////
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//// ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//// ////
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//// Copyright (C) 2000 Miha Dolenc, mihad@opencores.org ////
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//// ////
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//// This source file may be used and distributed without ////
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//// restriction provided that this copyright statement is not ////
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//// removed from the file and that any derivative work contains ////
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//// the original copyright notice and the associated disclaimer. ////
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//// ////
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//// This source file is free software; you can redistribute it ////
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//// and/or modify it under the terms of the GNU Lesser General ////
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//// Public License as published by the Free Software Foundation; ////
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//// either version 2.1 of the License, or (at your option) any ////
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//// later version. ////
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//// ////
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//// This source is distributed in the hope that it will be ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
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//// PURPOSE. See the GNU Lesser General Public License for more ////
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//// details. ////
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//// ////
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//// You should have received a copy of the GNU Lesser General ////
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//// Public License along with this source; if not, download it ////
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//// from http://www.opencores.org/lgpl.shtml ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//
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// CVS Revision History
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//
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// $Log: not supported by cvs2svn $
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// Revision 1.1.1.1 2002/02/18 16:16:56 mihad
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// Initial project import - working
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//
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//
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// synopsys translate_off
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`include "timescale.v"
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// synopsys translate_on
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module ps2_io_ctrl
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(
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clk_i,
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rst_i,
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ps2_ctrl_kbd_clk_en_i_,
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ps2_ctrl_kbd_data_en_i_,
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ps2_kbd_clk_pad_i,
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ps2_kbd_clk_pad_oe_o,
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ps2_kbd_data_pad_oe_o,
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inhibit_kbd_if_i,
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ps2_ctrl_kbd_clk_o
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);
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input clk_i,
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rst_i,
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ps2_ctrl_kbd_clk_en_i_,
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ps2_ctrl_kbd_data_en_i_,
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ps2_kbd_clk_pad_i,
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inhibit_kbd_if_i ;
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output ps2_kbd_clk_pad_oe_o,
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ps2_kbd_data_pad_oe_o,
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ps2_ctrl_kbd_clk_o ;
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reg ps2_kbd_clk_pad_oe_o,
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ps2_kbd_data_pad_oe_o ;
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always@(posedge clk_i or posedge rst_i)
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begin
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if ( rst_i )
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begin
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ps2_kbd_clk_pad_oe_o <= #1 1'b0 ;
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ps2_kbd_data_pad_oe_o <= #1 1'b0 ;
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end
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else
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begin
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ps2_kbd_clk_pad_oe_o <= #1 !ps2_ctrl_kbd_clk_en_i_ || inhibit_kbd_if_i ;
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ps2_kbd_data_pad_oe_o <= #1 !ps2_ctrl_kbd_data_en_i_ ;
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end
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end
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reg inhibit_kbd_if_previous ;
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always@(posedge clk_i or posedge rst_i)
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begin
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if ( rst_i )
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inhibit_kbd_if_previous <= #1 1'b1 ;
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else
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inhibit_kbd_if_previous <= #1 inhibit_kbd_if_i ;
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end
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assign ps2_ctrl_kbd_clk_o = ps2_kbd_clk_pad_i || ps2_kbd_clk_pad_oe_o && inhibit_kbd_if_previous ;
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endmodule // ps2_io_ctrl
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