Subversion Repositories vtach

`timescale 1us/1ns

// This input module reads from the input switches

// This isn't of great use since

// we only have 8 input switches you can't

// enter negative #s or #s >99

// However, you could work out software to read

// everything (e.g., PB2 is negative,

// PB1 is enter 3rd  digit, PB0 is

// enter 1st digit and go

// Or something like that if you wanted to

module io_input(input clk, input oe, inout [12:0] value, input rst, input [7:0] sw);

   reg [12:0] v;

// Only drive output when asked

   assign value=oe?v:13'bz;

        // set v to next input value based on addr

   always @(posedge clk)

     begin

                v<={ 6'b0, sw };

     end

endmodule