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[/] [s6soc/] [trunk/] [rtl/] [spio.v] - Diff between revs 46 and 51

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//
//
// Filename:    spio.v
// Filename:    spio.v
//
//
// Project:     CMod S6 System on a Chip, ZipCPU demonstration project
// Project:     CMod S6 System on a Chip, ZipCPU demonstration project
//
//
// Purpose:     
// Purpose:     To provide a bare minimum level of access to the two on-board
 
//              buttons, the 4 LED's, and the external 4x4 keypad.  This
 
//      routine does *nothing* to debounce either buttons or keypad.  Any such
 
//      debouncing *must* be done in software.  As with the rest of the S6
 
//      project, the goal is to keep the logic small and simple, and this
 
//      module is no different.
//
//
//      With the USB cord on top, the board facing you, LED[0] is on the left.
//      With the USB cord on top, the board facing you, LED[0] is on the left.
//
//
// Creator:     Dan Gisselquist, Ph.D.
// Creator:     Dan Gisselquist, Ph.D.
//              Gisselquist Technology, LLC
//              Gisselquist Technology, LLC
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                end
                end
 
 
        reg     [3:0]    x_kp_row, r_kp_row;
        reg     [3:0]    x_kp_row, r_kp_row;
        reg     [1:0]    x_btn, r_btn;
        reg     [1:0]    x_btn, r_btn;
 
 
 
        initial x_kp_row  = 4'h0;
 
        initial r_kp_row  = 4'b0;
 
        initial x_btn     = 2'b0;
 
        initial r_btn     = 2'b0;
 
        initial o_kp_int  = 1'b0;
 
        initial o_btn_int = 1'b0;
        always @(posedge i_clk)
        always @(posedge i_clk)
        begin
        begin
                x_kp_row <= i_kp_row;
                x_kp_row <= i_kp_row;
                x_btn    <= i_btn;
                x_btn    <= i_btn;
                r_kp_row <= x_kp_row;
                r_kp_row <= x_kp_row;

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