Subversion Repositories s80186

// Copyright Jamie Iles, 2017

//

// This file is part of s80x86.

//

// s80x86 is free software: you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

//

// s80x86 is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with s80x86.  If not, see .

module LoopCounter(input logic clk,

                   input logic [4:0] count_in,

                   input logic load,

                   input logic next,

                   output logic done);

reg [4:0] count;

assign done = ~|count;

always_ff @(posedge clk)

    if (load)

        count <= count_in;

    else if (next && |count)

        count <= count - 1'b1;

endmodule