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668 lvd 1 
// ZX-Evo Base Configuration (c) NedoPC 2008,2009,2010,2011,2012,2013,2014
155 lvd 2 
//
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// just DOS signal control
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/*
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    This file is part of ZX-Evo Base Configuration firmware.
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    ZX-Evo Base Configuration firmware is free software:
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    you can redistribute it and/or modify it under the terms of
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    the GNU General Public License as published by
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    the Free Software Foundation, either version 3 of the License, or
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    (at your option) any later version.
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    ZX-Evo Base Configuration firmware is distributed in the hope that
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    it will be useful, but WITHOUT ANY WARRANTY; without even
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    the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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    See the GNU General Public License for more details.
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    You should have received a copy of the GNU General Public License
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    along with ZX-Evo Base Configuration firmware.
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    If not, see <http://www.gnu.org/licenses/>.
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*/
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161 lvd 24 
`include "../include/tune.v"
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module zdos(
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        input  wire        fclk,
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        input  wire        rst_n,
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        input  wire        dos_turn_on,
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        input  wire        dos_turn_off,
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        input  wire        cpm_n,
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        output reg         dos
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);
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        always @(posedge fclk, negedge rst_n)
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        if( !rst_n )
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        begin
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                dos = 1'b1;
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        end
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        else // posedge fclk
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        begin
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                if( !cpm_n )
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                        dos <= 1'b1;
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                else if( dos_turn_off )
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                        dos <= 1'b0;
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                else if( dos_turn_on )
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                        dos <= 1'b1;
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        end
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endmodule
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