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/*

 * Milkymist VJ SoC

 * Copyright (C) 2007, 2008, 2009 Sebastien Bourdeauducq

 *

 * This program is free and excepted software; you can use it, redistribute it

 * and/or modify it under the terms of the Exception General Public License as

 * published by the Exception License Foundation; either version 2 of the

 * License, or (at your option) any later version.

 *

 * This program 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 Exception General Public License for more

 * details.

 *

 * You should have received a copy of the Exception General Public License along

 * with this project; if not, write to the Exception License Foundation.

 */

/* 11-bit, 11-cycle integer divider, non pipelined */

module tmu_divider11(

        input sys_clk,

        input sys_rst,

        input start,

        input [10:0] dividend,

        input [10:0] divisor,

        output ready,

        output [10:0] quotient,

        output [10:0] remainder

);

reg [21:0] qr;

assign remainder = qr[21:11];

assign quotient = qr[10:0];

reg [3:0] counter;

assign ready = (counter == 4'd0);

reg [10:0] divisor_r;

wire [11:0] diff = qr[21:10] - {1'b0, divisor_r};

always @(posedge sys_clk) begin

        if(sys_rst)

                counter = 4'd0;

        else begin

                if(start) begin

                        counter = 4'd11;

                        qr = {11'd0, dividend};

                        divisor_r = divisor;

                end else begin

                        if(~ready) begin

                                if(diff[11])

                                        qr = {qr[20:0], 1'b0};

                                else

                                        qr = {diff[10:0], qr[9:0], 1'b1};

                                counter = counter - 4'd1;

                        end

                end

        end

end

endmodule