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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.

 */

module tmu_filter(

        input sys_clk,

        input sys_rst,

        output busy,

        input [10:0] src_hres,

        input [10:0] src_vres,

        input [10:0] dst_hres,

        input [10:0] dst_vres,

        input [10:0] hoffset,

        input [10:0] voffset,

        input pipe_stb_i,

        output pipe_ack_o,

        input [10:0] P_X,

        input [10:0] P_Y,

        input [10:0] P_U,

        input [10:0] P_V,

        output pipe_stb_o,

        input pipe_ack_i,

        output reg [10:0] P_Xf,

        output reg [10:0] P_Yf,

        output reg [10:0] P_Uf,

        output reg [10:0] P_Vf

);

wire en;

wire s0_valid;

wire s1_valid;

reg s1_valid_r;

always @(posedge sys_clk) begin

        if(sys_rst)

                s1_valid_r <= 1'b0;

        else if(en) begin

                if((P_X >= hoffset) & (P_Y >= voffset) & (P_U < src_hres) & (P_V < src_vres))

                        s1_valid_r <= s0_valid;

                else

                        s1_valid_r <= 1'b0;

                P_Xf <= P_X - hoffset;

                P_Yf <= P_Y - voffset;

                P_Uf <= P_U;

                P_Vf <= P_V;

        end

end

assign s1_valid = s1_valid_r & (P_Xf < dst_hres) & (P_Yf < dst_vres);

/* Pipeline management */

assign busy = s1_valid;

assign s0_valid = pipe_stb_i;

assign pipe_ack_o = pipe_ack_i;

assign en = pipe_ack_i;

assign pipe_stb_o = s1_valid;

endmodule