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https://opencores.org/ocsvn/ps2/ps2/trunk
[/] [ps2/] [tags/] [rel_6/] [bench/] [verilog/] [ps2_keyboard_model.v] - Diff between revs 2 and 10
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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//
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//
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// CVS Revision History
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// CVS Revision History
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//
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//
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// $Log: not supported by cvs2svn $
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// $Log: not supported by cvs2svn $
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// Revision 1.1.1.1 2002/02/18 16:16:55 mihad
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// Initial project import - working
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//
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//
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//
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`include "timescale.v"
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`include "timescale.v"
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module ps2_keyboard_model
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module ps2_keyboard_model
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task kbd_receive_char;
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task kbd_receive_char;
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output [7:0] char ;
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output [7:0] char ;
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reg parity ;
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reg parity ;
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integer i ;
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integer i ;
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reg stop_bit_received ;
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reg stop_clocking ;
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begin:main
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begin:main
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i = 0 ;
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i = 0 ;
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stop_bit_received = 1 ;
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receiving = 1 ;
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receiving = 1 ;
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stop_clocking = 1'b0 ;
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#(kbd_clk_period/2) ;
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#(kbd_clk_period/2) ;
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while ( i < 11 )
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while ( !stop_clocking )
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begin
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begin
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if ( !kbd_clk_io )
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if ( !kbd_clk_io )
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begin
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begin
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receiving = 0 ;
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receiving = 0 ;
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begin
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begin
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parity = kbd_data_io ;
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parity = kbd_data_io ;
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if ( parity !== ( !(^char) ) )
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if ( parity !== ( !(^char) ) )
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$display("Invalid parity bit received") ;
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$display("Invalid parity bit received") ;
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end
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end
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else
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begin
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if ( kbd_data_io !== 1'b1 )
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begin
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i = i - 1 ;
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stop_bit_received = 0 ;
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end
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else
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begin
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kbd_data = 1'b0 ;
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end
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end
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end
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end
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i = i + 1 ;
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i = i + 1 ;
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#(kbd_clk_period/2) ;
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#(kbd_clk_period/4) ;
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if ( i > 9 )
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begin
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if ( kbd_data_io === 1'b1 )
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begin
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kbd_data <= 1'b0 ;
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stop_clocking = 1'b1 ;
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end
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end
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end
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if ( !kbd_clk_io )
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#(kbd_clk_period/4) ;
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begin
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receiving = 0 ;
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disable main ;
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end
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end
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kbd_clk = 1'b0 ;
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kbd_clk = 1'b0 ;
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#(kbd_clk_period/2) ;
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#(kbd_clk_period/2) ;
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kbd_clk <= 1'b1 ;
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kbd_clk <= 1'b1 ;
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kbd_data <= 1'b1 ;
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kbd_data <= 1'b1 ;
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if ( stop_bit_received )
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receiving = 0 ;
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if ( i === 10 )
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begin
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begin
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char_valid_o = !char_valid_o ;
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char_valid_o = !char_valid_o ;
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end
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end
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receiving = 0 ;
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end
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end
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endtask // kbd_receive_char
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endtask // kbd_receive_char
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endmodule // ps2_keyboard_model
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endmodule // ps2_keyboard_model
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