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/////////////////////////////////////////////////////////////////////

////                                                             ////

////  Author: Eyal Hochberg                                      ////

////          eyal@provartec.com                                 ////

////                                                             ////

////  Downloaded from: http://www.opencores.org                  ////

/////////////////////////////////////////////////////////////////////

////                                                             ////

//// Copyright (C) 2010 Provartec LTD                            ////

//// www.provartec.com                                           ////

//// info@provartec.com                                          ////

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//// This source file may be used and distributed without        ////

//// restriction provided that this copyright statement is not   ////

//// removed from the file and that any derivative work contains ////

//// the original copyright notice and the associated disclaimer.////

////                                                             ////

//// This source file is free software; you can redistribute it  ////

//// and/or modify it under the terms of the GNU Lesser General  ////

//// Public License as published by the Free Software Foundation.////

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//// useful, but WITHOUT ANY WARRANTY; without even the implied  ////

//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR     ////

//// PURPOSE.  See the GNU Lesser General Public License for more////

//// details. http://www.gnu.org/licenses/lgpl.html              ////

////                                                             ////

/////////////////////////////////////////////////////////////////////

//---------------------------------------------------------

//-- File generated by RobustVerilog parser

//-- Version: 1.0

//-- Invoked Fri Mar 25 23:33:02 2011

//--

//-- Source file: dma_ch_rd_slicer.v

//---------------------------------------------------------

module  dma_ahb64_core0_ch_rd_slicer (clk,reset,fifo_rd,fifo_rdata,fifo_rsize,rd_align,rd_ptr,rd_line_remain,wr_incr,wr_single,slice_rd,slice_rdata,slice_rsize,slice_rd_ptr,slice_rd_valid);

   input               clk;

   input               reset;

   input               fifo_rd;

   input [64-1:0]      fifo_rdata;

   input [4-1:0]      fifo_rsize;

   input [3-1:0]      rd_align;

   input [5-1:0]      rd_ptr;

   input [4-1:0]      rd_line_remain;

   input               wr_incr;

   input               wr_single;

   output               slice_rd;

   output [64-1:0]     slice_rdata;

   output [4-1:0]     slice_rsize;

   output [5-1:0]     slice_rd_ptr;

   output               slice_rd_valid;

   wire               slice_rd_pre;

   wire               slice_rd;

   wire [5-1:0]       slice_rd_ptr;

   reg [64-1:0]           slice_rdata;

   wire [4-1:0]       slice_rsize;

   wire               fifo_rd_d;

   wire               slice_rd_d;

   wire [3-1:0]       rd_align_valid_pre;

   reg [3-1:0]           rd_align_valid;

   reg [3-1:0]           rd_align_d;

   reg [64-1:0]           next_rdata_pre;

   reg [64-1:0]           next_rdata;

   reg [4-1:0]           actual_rsize;

   wire [4-1:0]       actual_rsize_pre;

   reg [4-1:0]           next_rsize_reg;

   wire [4-1:0]       next_rsize;

   wire               next_rd;

   //RDATA

   prgen_delay #(1) delay_fifo_rd0    (.clk(clk), .reset(reset), .din(fifo_rd), .dout(fifo_rd_d));

   prgen_delay #(2) delay_fifo_rd_valid (.clk(clk), .reset(reset), .din(fifo_rd_d), .dout(slice_rd_valid));

   prgen_delay #(1) delay_fifo_rd1    (.clk(clk), .reset(reset), .din(slice_rd_pre), .dout(slice_rd));

   prgen_delay #(1) delay_fifo_rd2    (.clk(clk), .reset(reset), .din(slice_rd), .dout(slice_rd_d));

   assign               rd_align_valid_pre =

                  (~wr_incr) & wr_single ? rd_align - rd_ptr[3-1:0] :

                  rd_align;

   always @(posedge clk or posedge reset)

     if (reset)

       begin

      rd_align_valid <= #1 {3{1'b0}};

      rd_align_d     <= #1 {3{1'b0}};

       end

     else

       begin

      rd_align_valid <= #1 rd_align_valid_pre;

      rd_align_d     <= #1 rd_align_valid;

       end

   always @(/*AUTOSENSE*/fifo_rdata or next_rdata or rd_align_d)

     begin

    case(rd_align_d[3-1:0])

      3'd0 : slice_rdata = next_rdata[63:0];

      3'd1 : slice_rdata = {fifo_rdata[55:0], next_rdata[7:0]};

      3'd2 : slice_rdata = {fifo_rdata[47:0], next_rdata[15:0]};

      3'd3 : slice_rdata = {fifo_rdata[39:0], next_rdata[23:0]};

      3'd4 : slice_rdata = {fifo_rdata[31:0], next_rdata[31:0]};

      3'd5 : slice_rdata = {fifo_rdata[23:0], next_rdata[39:0]};

      3'd6 : slice_rdata = {fifo_rdata[15:0], next_rdata[47:0]};

      3'd7 : slice_rdata = {fifo_rdata[7:0],  next_rdata[55:0]};

    endcase

     end

   always @(/*AUTOSENSE*/fifo_rdata or rd_align_valid)

     begin

    case(rd_align_valid[3-1:0])

      3'd0 : next_rdata_pre = fifo_rdata[63:0];

      3'd1 : next_rdata_pre = {{56{1'b0}}, fifo_rdata[63:56]};

      3'd2 : next_rdata_pre = {{48{1'b0}}, fifo_rdata[63:48]};

      3'd3 : next_rdata_pre = {{40{1'b0}}, fifo_rdata[63:40]};

      3'd4 : next_rdata_pre = {{32{1'b0}}, fifo_rdata[63:32]};

      3'd5 : next_rdata_pre = {{24{1'b0}}, fifo_rdata[63:24]};

      3'd6 : next_rdata_pre = {{16{1'b0}}, fifo_rdata[63:16]};

      3'd7 : next_rdata_pre = {{8{1'b0}},  fifo_rdata[63:8]};

    endcase

     end

   always @(posedge clk or posedge reset)

     if (reset)

       next_rdata <= #1 {64{1'b0}};

     else if (slice_rd_d)

       next_rdata <= #1 next_rdata_pre;

   //RSIZE

   assign actual_rsize_pre    = next_rsize + ({4{fifo_rd}} & fifo_rsize);

   always @(posedge clk or posedge reset)

     if (reset)

       actual_rsize <= #1 {4{1'b0}};

     else if (fifo_rd | (|next_rsize))

       actual_rsize <= #1 actual_rsize_pre;

   prgen_min2 #(4) min_rsize(

                   .a(rd_line_remain),

                   .b(actual_rsize),

                   .min(slice_rsize)

                   );

   always @(posedge clk or posedge reset)

     if (reset)

       next_rsize_reg <= #1 {4{1'b0}};

     else if (next_rd)

       next_rsize_reg <= #1 {4{1'b0}};

     else if (fifo_rd | slice_rd)

       next_rsize_reg <= #1 next_rsize + ({4{fifo_rd}} & fifo_rsize);

   assign next_rsize = next_rsize_reg - ({4{fifo_rd_d}} & slice_rsize);

   //CMD

   assign next_rd         = (~fifo_rd) & (|next_rsize);

   assign slice_rd_pre    = fifo_rd | next_rd;

   assign slice_rd_ptr    = rd_ptr;

endmodule