Subversion Repositories dma_axi

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

////                                                             ////

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

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

////                                                             ////

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

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

////                                                             ////

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

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

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

////                                                             ////

//// 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.////

////                                                             ////

//// This source 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 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 23:36:56 2011

//--

//-- Source file: dma_ch_remain.v

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

module dma_axi64_core0_ch_remain(clk,reset,ch_update,wr_outstanding,rd_outstanding,load_req_in_prog,rd_line_cmd,rd_burst_start,rd_burst_size,rd_transfer,rd_transfer_size,wr_clr_line,wr_burst_start,wr_burst_size,wr_transfer,wr_transfer_size,rd_gap,wr_fullness);

   input                    clk;

   input             reset;

   input             ch_update;

   input             wr_outstanding;

   input             rd_outstanding;

   input             load_req_in_prog;

   input             rd_line_cmd;

   input             rd_burst_start;

   input [8-1:0]   rd_burst_size;

   input             rd_transfer;

   input [4-1:0]    rd_transfer_size;

   input             wr_clr_line;

   input             wr_burst_start;

   input [8-1:0]   wr_burst_size;

   input             wr_transfer;

   input [4-1:0]    wr_transfer_size;

   output [5:0]     rd_gap;

   output [5:0]     wr_fullness;

   wire             rd_line_cmd_valid;

   reg [5+1:0]         rd_gap_reg; //signed

   reg [5+1:0]         wr_fullness_reg; //signed

   wire             rd_burst_qual;

   wire             wr_burst_qual;

   reg [8-1:0]     rd_burst_size_valid;

   wire [4-1:0]     rd_transfer_size_valid;

   wire [4-1:0]     wr_transfer_size_valid;

   reg [8-1:0]     wr_burst_size_valid;

   assign             rd_line_cmd_valid = rd_line_cmd & rd_burst_start;

   assign             rd_burst_qual = rd_burst_start & (~load_req_in_prog);

   assign             wr_burst_qual = wr_burst_start;

   always @(posedge clk or posedge reset)

     if (reset)

       rd_burst_size_valid <= #1 {8{1'b0}};

     else if (rd_burst_qual)

       rd_burst_size_valid <= #1 rd_burst_size;

     else

       rd_burst_size_valid <= #1 {8{1'b0}};

   always @(posedge clk or posedge reset)

     if (reset)

       wr_burst_size_valid <= #1 {8{1'b0}};

     else if (wr_burst_qual)

       wr_burst_size_valid <= #1 wr_burst_size;

     else

       wr_burst_size_valid <= #1 {8{1'b0}};

   assign             rd_transfer_size_valid = {4{rd_transfer}} & rd_transfer_size;

   assign             wr_transfer_size_valid = {4{wr_transfer}} & wr_transfer_size;

   //for rd bursts

   always @(posedge clk or posedge reset)

     if (reset)

       rd_gap_reg <= #1 {1'b0, 1'b1, {5{1'b0}}};

     else if (ch_update)

       rd_gap_reg <= #1 {1'b0, 1'b1, {5{1'b0}}};

     else

       rd_gap_reg <= #1 rd_gap_reg -

             rd_burst_size_valid +

             wr_transfer_size_valid;

   assign rd_gap = rd_gap_reg[5+1] ? 'd0 : rd_gap_reg[5:0];

   //for wr bursts

   always @(posedge clk or posedge reset)

     if (reset)

       wr_fullness_reg <= #1 {5+1{1'b0}};

     else if (ch_update)

       wr_fullness_reg <= #1 {5+1{1'b0}};

     else

       wr_fullness_reg <= #1 wr_fullness_reg -

              wr_burst_size_valid +

              rd_transfer_size_valid;

   assign wr_fullness = wr_fullness_reg[5+1] ? 'd0 : wr_fullness_reg[5:0];

endmodule