Subversion Repositories dma_ahb

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

////                                                             ////

////  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 23:32:59 2011

//--

//-- Source file: dma_core_ahbm_wr.v

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

module dma_ahb64_core0_ahbm_wr(clk,reset,rd_transfer,rd_transfer_size,joint_req,joint_in_prog,joint_stall,wr_last_cmd,wr_ch_num,wr_ch_num_resp,wr_port_num,wr_cmd_port,wr_burst_start,wr_burst_addr,wr_burst_size,wr_cmd_pending,wr_line_cmd,ch_fifo_rd,ch_fifo_rd_num,ch_fifo_rdata,ch_fifo_rd_valid,ch_fifo_rsize,ch_fifo_wr_ready,wr_transfer,wr_transfer_num,wr_transfer_size,wr_next_size,wr_slverr,wr_clr,wr_clr_last,wr_clr_line,wr_clr_line_num,wr_cmd_full,wr_hold,ahb_wr_timeout,ahb_wr_timeout_num,HADDR,HBURST,HSIZE,HTRANS,HLAST,HWDATA,HREADY,HRESP,HOLD,SYNC);

   input               clk;

   input               reset;

   input               rd_transfer;

   input [4-1:0]      rd_transfer_size;

   input               joint_req;

   input               joint_in_prog;

   output               joint_stall;

   //command

   input               wr_last_cmd;

   input [2:0]               wr_ch_num;

   output [2:0]           wr_ch_num_resp;

   output               wr_port_num;

   input               wr_cmd_port;

   input               wr_burst_start;

   input [32-1:0]      wr_burst_addr;

   input [8-1:0]     wr_burst_size;

   output               wr_cmd_pending;

   input               wr_line_cmd;

   //data

   output               ch_fifo_rd;

   output [2:0]           ch_fifo_rd_num;

   input [64-1:0]      ch_fifo_rdata;

   input               ch_fifo_rd_valid;

   output [4-1:0]     ch_fifo_rsize;

   input               ch_fifo_wr_ready;

   output               wr_transfer;

   output [2:0]           wr_transfer_num;

   output [4-1:0]     wr_transfer_size;

   output [4-1:0]     wr_next_size;

   //resp

   output               wr_slverr;

   output               wr_clr;

   output               wr_clr_last;

   output               wr_clr_line;

   output [2:0]           wr_clr_line_num;

   output               wr_cmd_full;

   output               wr_hold;

   output               ahb_wr_timeout;

   output [2:0]           ahb_wr_timeout_num;

   output [32-1:0]     HADDR;

   output [2:0]           HBURST;

   output [1:0]           HSIZE;

   output [1:0]           HTRANS;

   output               HLAST;

   output [64-1:0]     HWDATA;

   input               HREADY;

   input               HRESP;

   input               HOLD;

   input               SYNC;

   wire [32-1:0]       HADDR_base;

   wire [2:0]               HBURST_pre;

   wire [1:0]               HSIZE_pre;

   wire [2:0]               HBURST;

   wire [1:0]               HSIZE;

   reg [1:0]               HTRANS;

   wire [64-1:0]       HWDATA;

   wire               wr_last_cmd_out;

   wire               ch_fifo_rd_last;

   wire               data_ready_pre;

   wire               data_ready;

   reg                   data_phase;

   reg [3:0]               data_counter;

   wire [3:0]               data_num_pre;

   wire [3:0]               data_num;

   wire               data_last;

   wire               data_pending_pre;

   wire               data_pending;

   wire [8-1:3] strb_num;

   reg [3:0]              cmd_counter;

   reg [3:0]               last_counter;

   wire [3:0]               cmd_num;

   wire               cmd_single_in;

   wire               cmd_single_out;

   wire               cmd_last;

   wire               cmd_empty;

   wire               cmd_full;

   wire               cmd_data_empty;

   wire               cmd_data_full;

   wire               data_empty;

   wire               data_full;

   wire [2:0]               data_fullness_pre;

   reg [2:0]               data_fullness;

   reg [1:0]               data_on_the_way;

   wire [4-1:0]       data_width;

   wire               ahb_cmd;

   wire               ahb_cmd_first;

   wire               ahb_cmd_last;

   wire               ahb_data_last;

   wire               ahb_idle;

   wire               ahb_busy;

   wire [4-1:0]       wr_next_size_in;

   wire               wr_transfer_pre;

   reg [4-1:0]           wr_transfer_size_pre;

   reg [2:0]               wr_transfer_num_pre;

   wire               wr_transfer;

   reg [4-1:0]           wr_transfer_size;

   reg [2:0]               wr_transfer_num;

   reg [2:0]               wr_ch_num_resp;

   wire               wr_port_num;

   wire [2:0]               wr_ch_num_out;

   wire [2:0]               ch_fifo_rd_num;

   wire               wr_clr_pre;

   wire               wr_clr;

   wire               wr_clr_last_pre;

   wire               wr_clr_last;

   wire               wr_clr_line_pre;

   wire               wr_clr_line_pre_d;

   wire               wr_clr_line_stall;

   wire               wr_clr_line;

   wire               wr_line_out;

   wire               port_change;

   wire               port_change_end;

   reg [2:0]               wr_clr_line_num_reg;

   reg                   ahb_cmd_last_d;

   reg                   wr_last_cmd_d;

   wire               wr_last_cmd_valid;

   wire               cmd_pending_pre;

   wire               wr_slverr_pre;

   reg                   wr_slverr_reg;

   wire               joint_req_out;

   wire [4-1:0]       rd_transfer_size_joint;

   wire               rd_transfer_full;

   wire               joint_stall;

   wire               joint_fifo_rd_valid;

   parameter                  TRANS_IDLE   = 2'b00;

   parameter                  TRANS_BUSY   = 2'b01;

   parameter                  TRANS_NONSEQ = 2'b10;

   parameter               TRANS_SEQ    = 2'b11;

   parameter                  BURST_SINGLE = 3'b000;

   parameter               BURST_INCR4  = 3'b011;

   parameter               BURST_INCR8  = 3'b101;

   parameter               BURST_INCR16 = 3'b111;

   prgen_joint_stall #(4)

     gen_joint_stall (

              .clk(clk),

              .reset(reset),

              .joint_req_out(joint_req_out),

              .rd_transfer(rd_transfer),

              .rd_transfer_size(rd_transfer_size),

              .ch_fifo_rd(ch_fifo_rd),

              .data_fullness_pre(data_fullness_pre),

              .HOLD(HOLD),

              .joint_fifo_rd_valid(joint_fifo_rd_valid),

              .rd_transfer_size_joint(rd_transfer_size_joint),

              .rd_transfer_full(rd_transfer_full),

              .joint_stall(joint_stall)

              );

   prgen_delay #(2) delay_fifo_rd0 (.clk(clk), .reset(reset), .din(ch_fifo_rd), .dout(data_ready_pre));

   prgen_delay #(1) delay_fifo_rd1 (.clk(clk), .reset(reset), .din(data_ready_pre), .dout(data_ready));

   assign               ch_fifo_rd =

                  joint_fifo_rd_valid |

                  ((~cmd_data_empty) &

                   (~data_pending) &

                   (~wr_clr_line_stall) &

                   (~joint_in_prog) &

                   & ch_fifo_wr_ready);

   assign               wr_hold          = cmd_full;

   assign               ch_fifo_rd_last  = ch_fifo_rd & data_last;

   assign               cmd_pending_pre  = HTRANS[1] & (~HREADY);

   assign               ahb_cmd          = HTRANS[1] & HREADY & (~HOLD);

   assign               ahb_cmd_first    = ahb_cmd & (HTRANS[1:0] == TRANS_NONSEQ);

   assign               ahb_cmd_last     = ahb_cmd & cmd_last;

   assign               ahb_idle         = HTRANS[1:0] == TRANS_IDLE;

   assign               ahb_busy         = HTRANS[1:0] == TRANS_BUSY;

   assign               wr_transfer_pre  = data_phase & HREADY;

   assign               wr_slverr_pre    = data_phase & HREADY & HRESP;

   assign               wr_clr_line_pre  = ch_fifo_rd_last & wr_line_out;

   assign               wr_cmd_full      = cmd_data_full | cmd_full;

   prgen_stall stall_wr_clr (.clk(clk), .reset(reset), .din(ahb_data_last), .stall(SYNC), .dout(wr_clr_pre));

   prgen_stall stall_wr_clr_last (.clk(clk), .reset(reset), .din(wr_last_cmd_valid), .stall(SYNC), .dout(wr_clr_last_pre));

   prgen_delay #(1) delay_wr_clr (.clk(clk), .reset(reset), .din(wr_clr_pre), .dout(wr_clr));

   prgen_delay #(1) delay_wr_clr_last (.clk(clk), .reset(reset), .din(wr_clr_last_pre), .dout(wr_clr_last));

   prgen_delay #(1) delay_cmd_pending (.clk(clk), .reset(reset), .din(cmd_pending_pre), .dout(wr_cmd_pending));

   always @(posedge clk or posedge reset)

     if (reset)

       ahb_cmd_last_d <= #1 1'b0;

     else if (ahb_cmd_last)

       ahb_cmd_last_d <= #1 1'b1;

     else if (ahb_data_last)

       ahb_cmd_last_d <= #1 1'b0;

   always @(posedge clk or posedge reset)

     if (reset)

       wr_last_cmd_d <= #1 1'b0;

     else if (ahb_cmd_last)

       wr_last_cmd_d <= #1 wr_last_cmd_out;

     else if (ahb_data_last)

       wr_last_cmd_d <= #1 1'b0;

   always @(posedge clk or posedge reset)

     if (reset)

       wr_slverr_reg <= #1 1'b0;

     else if (wr_slverr_pre)

       wr_slverr_reg <= #1 1'b1;

     else if (wr_slverr)

       wr_slverr_reg <= #1 1'b0;

   assign               wr_slverr = wr_slverr_reg & wr_clr;

   assign               ahb_data_last     = ahb_cmd_last_d & HREADY;

   assign               wr_last_cmd_valid = wr_last_cmd_d & ahb_data_last;

   assign               wr_clr_line       = 1'b0;

   assign               wr_clr_line_stall = 1'b0;

   assign               wr_clr_line_num   = 3'd0;

   assign               cmd_num          =

                  HBURST == BURST_INCR16 ? 4'd15 :

                  HBURST == BURST_INCR8  ? 4'd7 :

                  HBURST == BURST_INCR4  ? 4'd3 : 4'd0;

   assign               cmd_last         = cmd_single_out | (last_counter == 'd0);

   always @(posedge clk or posedge reset)

     if (reset)

       last_counter <= #1 4'hf;

     else if (ahb_cmd & (HTRANS == TRANS_NONSEQ))

       last_counter <= #1 cmd_num - 1'b1;

     else if (ahb_cmd)

       last_counter <= #1 last_counter - 1'b1;

   always @(posedge clk or posedge reset)

     if (reset)

       cmd_counter <= #1 4'd0;

     else if (ahb_cmd_last)

       cmd_counter <= #1 4'd0;

     else if (ahb_cmd)

       cmd_counter <= #1 cmd_counter + 1'b1;

   assign               data_last        = data_counter == data_num;

   always @(posedge clk or posedge reset)

     if (reset)

       data_counter <= #1 4'd0;

     else if (ch_fifo_rd & data_last)

       data_counter <= #1 4'd0;

     else if (ch_fifo_rd)

       data_counter <= #1 data_counter + 1'b1;

   always @(posedge clk or posedge reset)

     if (reset)

       data_phase <= #1 1'b0;

     else if (ahb_cmd)

       data_phase <= #1 1'b1;

     else if (ahb_data_last)

       data_phase <= #1 1'b0;

   assign               data_width =

                  HSIZE == 2'b00 ? 'd1 :

                  HSIZE == 2'b01 ? 'd2 :

                  HSIZE == 2'b10 ? 'd4 : 'd8;

   assign               wr_next_size_in = {|wr_burst_size[8-1:3], wr_burst_size[3-1:0]};

   assign               ch_fifo_rsize = joint_fifo_rd_valid ? rd_transfer_size_joint : wr_next_size;

   assign               HADDR = HADDR_base | {cmd_counter, {3{1'b0}}};

   assign               strb_num = wr_burst_size[8-1:3];

   assign               cmd_single_in = strb_num <= 'd1;

   assign               data_num_pre =

                  strb_num == 'd16 ? 'd15 :

                  strb_num == 'd8  ? 'd7  :

                  strb_num == 'd4  ? 'd3  : 'd0;

   assign               HBURST_pre =

                  strb_num == 'd16 ? BURST_INCR16 :

                  strb_num == 'd8  ? BURST_INCR8  :

                  strb_num == 'd4  ? BURST_INCR4  : BURST_SINGLE;

   assign               HSIZE_pre =

                  wr_burst_size == 'd1 ? 2'b00 :

                  wr_burst_size == 'd2 ? 2'b01 :

                  wr_burst_size == 'd4 ? 2'b10 : 3;

   assign               HLAST = cmd_last & (~cmd_empty);

   always @(posedge clk or posedge reset)

     if (reset)

       HTRANS <= #1 TRANS_IDLE;

     else if (port_change)

       HTRANS <= #1 TRANS_IDLE;

     else if (ahb_idle & port_change_end & (data_fullness_pre > 'd0))

       HTRANS <= #1 TRANS_NONSEQ;

     else if (ahb_cmd_last & ((data_fullness > 'd2) | data_ready_pre)) //burst end and data ready

       HTRANS <= #1 TRANS_NONSEQ;

     else if (ahb_idle & ((data_fullness > 'd1) | data_ready_pre)) //bus idle and data ready

       HTRANS <= #1 TRANS_NONSEQ;

     else if (ahb_cmd_last)

       HTRANS <= #1 TRANS_IDLE;

     else if (ahb_cmd & (data_fullness_pre <= 'd1) & (~data_ready_pre))

       HTRANS <= #1 TRANS_BUSY;

     else if (ahb_cmd | (ahb_busy & data_ready_pre))

       HTRANS <= #1 TRANS_SEQ;

   always @(posedge clk or posedge reset)

     if (reset)

       begin

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

      wr_transfer_num_pre  <= #1 3'd0;

       end

     else if (ahb_cmd)

       begin

      wr_transfer_size_pre <= #1 data_width;

      wr_transfer_num_pre  <= #1 wr_ch_num_out;

       end

   prgen_delay #(1) delay_wr_transfer (.clk(clk), .reset(reset), .din(wr_transfer_pre), .dout(wr_transfer));

   always @(posedge clk or posedge reset)

     if (reset)

       begin

      wr_transfer_num  <= #1 3'd0;

      wr_transfer_size <= #1 3'd0;

       end

     else if (wr_transfer_pre)

       begin

      wr_transfer_num  <= #1 wr_transfer_num_pre;

      wr_transfer_size <= #1 wr_transfer_size_pre;

       end

   always @(posedge clk or posedge reset)

     if (reset)

       wr_ch_num_resp <= #1 3'd0;

     else if (ahb_data_last)

       wr_ch_num_resp <= #1 wr_transfer_num_pre;

   prgen_fifo #(32+3+2+1+1+3+1+1, 2+1)

   cmd_fifo(

        .clk(clk),

        .reset(reset),

        .push(wr_burst_start),

        .pop(ahb_cmd_last),

        .din({wr_burst_addr,

          HBURST_pre,

          HSIZE_pre,

          wr_last_cmd,

          wr_cmd_port,

          wr_ch_num,

          joint_req,

          cmd_single_in

          }),

        .dout({HADDR_base,

           HBURST,

           HSIZE,

           wr_last_cmd_out,

           wr_port_num,

           wr_ch_num_out,

           joint_req_out,

           cmd_single_out

           }),

        .empty(cmd_empty),

        .full(cmd_full)

        );

   prgen_fifo #(4+4+3+1, 2+1)

   cmd_data_fifo(

         .clk(clk),

         .reset(reset),

         .push(wr_burst_start),

         .pop(ch_fifo_rd_last),

         .din({wr_next_size_in,

               data_num_pre,

               wr_ch_num,

               wr_line_cmd

               }),

         .dout({wr_next_size,

            data_num,

            ch_fifo_rd_num,

            wr_line_out

            }),

         .empty(cmd_data_empty),

         .full(cmd_data_full)

         );

   assign port_change     = 1'b0;

   assign port_change_end = 1'b0;

   assign data_fullness_pre = data_fullness + data_ready - wr_transfer_pre;

   always @(posedge clk or posedge reset)

     if (reset)

       data_fullness <= #1 3'd0;

     else if (data_ready | wr_transfer_pre)

       data_fullness <= #1 data_fullness_pre;

   always @(posedge clk or posedge reset)

     if (reset)

       data_on_the_way <= #1 2'd0;

     else if (ch_fifo_rd | data_ready)

       data_on_the_way <= #1 data_on_the_way + ch_fifo_rd - data_ready;

   assign data_pending_pre =  ((data_fullness + data_on_the_way) > 'd3) & (~wr_transfer_pre);

   prgen_delay #(1) delay_data_pending (.clk(clk), .reset(reset), .din(data_pending_pre), .dout(data_pending));

   //depth is set by maximum fifo read data latency

   prgen_fifo #(64, 5+2)

   data_fifo(

                      .clk(clk),

                      .reset(reset),

                      .push(data_ready),

                      .pop(wr_transfer_pre),

                      .din(ch_fifo_rdata),

                      .dout(HWDATA),

                      .empty(data_empty),

                      .full(data_full)

                      );

   dma_ahb64_core0_ahbm_timeout  dma_ahb64_core0_ahbm_timeout (

                             .clk(clk),

                             .reset(reset),

                             .HTRANS(HTRANS),

                             .HREADY(HREADY),

                             .ahb_timeout(ahb_wr_timeout)

                             );

   assign                     ahb_wr_timeout_num = wr_ch_num_out;

endmodule