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 23:31:23 2011

//--

//-- Source file: dma_core_ahbm_rd.v

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

module dma_ahb32_core0_ahbm_rd(clk,reset,load_wr,load_wr_cycle,joint_stall,load_req_in_prog,rd_ch_num,rd_port_num,rd_cmd_port,rd_burst_start,rd_burst_addr,rd_burst_size,rd_cmd_pending,rd_line_cmd,rd_cmd_line,rd_cmd_num,ch_fifo_wr,ch_fifo_wdata,ch_fifo_wsize,ch_fifo_wr_num,rd_transfer,rd_transfer_size,rd_transfer_num,rd_slverr,rd_clr,rd_clr_last,rd_clr_load,rd_clr_line,rd_clr_line_num,rd_hold,ahb_rd_timeout,ahb_rd_timeout_num,HADDR,HBURST,HSIZE,HTRANS,HLAST,HRDATA,HREADY,HRESP,HOLD,SYNC);

   input               clk;

   input               reset;

   output               load_wr;

   output [1:0]           load_wr_cycle;

   input               joint_stall;

   //command

   input               load_req_in_prog;

   input [2:0]               rd_ch_num;

   output               rd_port_num;

   input               rd_cmd_port;

   input               rd_burst_start;

   input [32-1:0]      rd_burst_addr;

   input [7-1:0]     rd_burst_size;

   output               rd_cmd_pending;

   input               rd_line_cmd;

   output               rd_cmd_line;

   output [2:0]           rd_cmd_num;

   //data

   output               ch_fifo_wr;

   output [32-1:0]     ch_fifo_wdata;

   output [3-1:0]     ch_fifo_wsize;

   output [2:0]           ch_fifo_wr_num;

   output               rd_transfer;

   output [3-1:0]     rd_transfer_size;

   output [2:0]           rd_transfer_num;

   //resp

   output               rd_slverr;

   output               rd_clr;

   output               rd_clr_last;

   output               rd_clr_load;

   output               rd_clr_line;

   output [2:0]           rd_clr_line_num;

   output               rd_hold;

   output               ahb_rd_timeout;

   output [2:0]           ahb_rd_timeout_num;

   output [32-1:0]     HADDR;

   output [2:0]           HBURST;

   output [1:0]           HSIZE;

   output [1:0]           HTRANS;

   output               HLAST;

   input [32-1:0]      HRDATA;

   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 [1:0]               HSIZE_data;

   wire [32-1:0]       HADDR;

   wire [2:0]               HBURST;

   wire [1:0]               HSIZE;

   reg [1:0]               HTRANS;

   wire               ch_fifo_wr_pre;

   wire               ch_fifo_wr_pre_d;

   wire               ch_fifo_wr;

   wire               ch_fifo_wr_stall;

   wire               ch_fifo_wr_last;

   reg [32-1:0]           ch_fifo_wdata;

   wire [3-1:0]       ch_fifo_wsize_pre;

   reg [3-1:0]           ch_fifo_wsize;

   reg [2:0]               ch_fifo_wr_num;

   wire               rd_slverr_pre;

   wire               rd_slverr;

   wire               wr_data;

   wire               load_wr_pre;

   reg [1:0]               load_wr_cycle;

   wire               load_wr_last;

   reg                   data_phase;

   wire [7-1:2] strb_num;

   reg [4:0]               cmd_counter;

   wire [4:0]               cmd_num;

   wire               cmd_last;

   wire [3-1:0]       data_width;

   wire               ahb_cmd;

   wire               ahb_cmd_first;

   wire               ahb_cmd_last;

   reg                   ahb_cmd_last_d;

   wire               ahb_data_last;

   wire               ahb_idle;

   wire               ahb_busy;

   wire               cmd_pop_stall;

   wire               cmd_pop;

   wire               cmd_empty;

   wire               cmd_full;

   wire               cmd_next;

   wire               cmd_data_empty;

   wire               cmd_data_full;

   wire               cmd_pending_pre;

   wire               load_data_in_prog;

   wire               rd_port_num;

   wire [2:0]               rd_ch_num_out_cmd;

   wire [2:0]               rd_ch_num_out_data;

   wire               rd_line_out;

   wire               port_change;

   wire               port_change_end;

   wire               port_change_stall;

   wire               rd_clr_pre;

   wire               rd_clr;

   wire               rd_clr_last_pre;

   wire               rd_clr_last;

   wire               rd_clr_line_pre;

   wire               rd_clr_line;

   reg                   rd_clr_line_wait_reg;

   wire               rd_clr_line_wait;

   wire               rd_clr_line_idle;

   reg [2:0]               rd_clr_line_num_reg;

   wire               rd_cmd_line_pre;

   wire               rd_cmd_line;

   reg [2:0]               rd_cmd_num_reg;

   wire               ahb_cmd_line;

   wire               joint_stall_change_pre;

   wire               joint_stall_change;

   wire               joint_stall_last_pre;

   reg                   joint_stall_last;

   wire               rd_burst_stall;

   wire               rd_burst_start_d;

   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;

   assign               rd_hold          = cmd_data_full | load_data_in_prog;

   assign               wr_data          = data_phase & HREADY;

   assign               load_wr_pre      = load_data_in_prog & wr_data;

   assign               ch_fifo_wr_pre   = (~load_data_in_prog) & wr_data;

   assign               ch_fifo_wr_last  = ch_fifo_wr_pre & ahb_cmd_last_d;

   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               rd_transfer      = ch_fifo_wr;

   assign               rd_transfer_size = ch_fifo_wsize;

   assign               rd_transfer_num  = ch_fifo_wr_num;

   assign               rd_slverr_pre    = data_phase & HREADY & HRESP;

   assign               rd_clr_pre       = ahb_data_last & (~load_data_in_prog);

   assign               rd_clr_last_pre  = ahb_data_last & load_data_in_prog;

   assign               rd_clr_load      = rd_clr_last;

   prgen_delay #(1) delay_rd_slverr (.clk(clk), .reset(reset), .din(rd_slverr_pre), .dout(rd_slverr));

   prgen_delay #(1) delay_load_wr (.clk(clk), .reset(reset), .din(load_wr_pre), .dout(load_wr));

   prgen_delay #(1) delay_rd_clr (.clk(clk), .reset(reset), .din(rd_clr_pre), .dout(rd_clr));

   prgen_delay #(1) delay_rd_clr_last (.clk(clk), .reset(reset), .din(rd_clr_last_pre), .dout(rd_clr_last));

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

   assign               rd_clr_line_wait = 1'b0;

   assign               rd_clr_line_idle = 1'b0;

   assign               rd_cmd_line_pre  = 1'b0;

   assign               rd_clr_line_pre  = 1'b0;

   assign               rd_cmd_line      = 1'b0;

   assign               rd_cmd_num       = 3'd0;

   assign               rd_clr_line      = 1'b0;

   assign               rd_clr_line_num  = 3'd0;

   prgen_delay #(1) delay_fifo_wr (.clk(clk), .reset(reset), .din(ch_fifo_wr_pre), .dout(ch_fifo_wr_pre_d));

   assign               joint_stall_change_pre = joint_stall & ((rd_transfer_num != rd_ch_num_out_data) | (HOLD & HREADY));

   assign               joint_stall_last_pre = joint_stall & ahb_data_last & ahb_idle;

   prgen_delay #(1) delay_joint_stall_change (.clk(clk), .reset(reset), .din(joint_stall_change_pre), .dout(joint_stall_change));

   always @(posedge clk or posedge reset)

     if (reset)

       joint_stall_last <= #1 1'b0;

     else if (joint_stall_last_pre)

       joint_stall_last <= #1 1'b1;

     else if (!joint_stall)

       joint_stall_last <= #1 1'b0;

   assign               ch_fifo_wr_stall = (joint_stall_change & (~ahb_idle)) | joint_stall_last | ahb_busy;

   prgen_stall stall_fifo_wr (.clk(clk), .reset(reset), .din(ch_fifo_wr_pre_d), .stall(ch_fifo_wr_stall), .dout(ch_fifo_wr));

   assign               cmd_pop_stall = joint_stall | port_change;

   prgen_stall stall_cmd_pop (.clk(clk), .reset(reset), .din(ahb_cmd_last), .stall(cmd_pop_stall), .dout(cmd_pop));

   assign               cmd_num =

                  HBURST == BURST_INCR16 ? 5'd16 :

                  HBURST == BURST_INCR8  ? 5'd8 :

                  HBURST == BURST_INCR4  ? 5'd4 : 5'd1;

   assign               load_wr_last = load_wr_pre & ahb_cmd_last_d;

   always @(posedge clk or posedge reset)

     if (reset)

       load_wr_cycle <= #1 2'b00;

     else if (load_wr)

       load_wr_cycle <= #1 load_wr_cycle + 1'b1;

   assign               ahb_data_last = ch_fifo_wr_last | load_wr_last;

   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;

   assign               cmd_last         = cmd_counter == (cmd_num - 1'b1);

   always @(posedge clk or posedge reset)

     if (reset)

       cmd_counter <= #1 5'd0;

     else if (ahb_cmd_last)

       cmd_counter <= #1 5'd0;

     else if (ahb_cmd)

       cmd_counter <= #1 cmd_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               ch_fifo_wsize_pre =

                  HSIZE_data == 2'b00 ? 'd1 :

                  HSIZE_data == 2'b01 ? 'd2 :

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

   always @(posedge clk or posedge reset)

     if (reset)

       begin

      ch_fifo_wsize  <= #1 2'b00;

      ch_fifo_wdata  <= #1 {32{1'b0}};

      ch_fifo_wr_num <= #1 3'b000;

       end

     else if (wr_data)

       begin

      ch_fifo_wsize  <= #1 ch_fifo_wsize_pre;

      ch_fifo_wdata  <= #1 HRDATA;

      ch_fifo_wr_num <= #1 rd_ch_num_out_data;

       end

   assign               cmd_next = 2 > 1 ? cmd_full : 1'b0;

   assign               HLAST = cmd_last & (~cmd_empty);

   assign               rd_burst_stall = (ahb_idle & cmd_empty & ahb_cmd_last_d & (~ahb_data_last)) | joint_stall;

   prgen_stall stall_burst_start (.clk(clk), .reset(reset), .din(rd_burst_start), .stall(rd_burst_stall), .dout(rd_burst_start_d));

   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 & (~cmd_data_empty))

       HTRANS <= #1 TRANS_NONSEQ;

     else if (rd_clr_line & ahb_idle & ((~cmd_empty) | rd_burst_start))

       HTRANS <= #1 TRANS_NONSEQ;

     else if (((rd_line_out | rd_cmd_line_pre | joint_stall) & ahb_cmd_last) | rd_clr_line_idle)

       HTRANS <= #1 TRANS_IDLE;

     else if ((rd_burst_start_d & (ahb_idle | ahb_cmd_last)) | (cmd_next & cmd_pop))

       HTRANS <= #1 TRANS_NONSEQ;

     else if (ahb_cmd_last)

       HTRANS <= #1 TRANS_IDLE;

     else if (ahb_cmd & joint_stall)

       HTRANS <= #1 TRANS_BUSY;

     else if (ahb_cmd | (ahb_busy & (~joint_stall)))

       HTRANS <= #1 TRANS_SEQ;

   assign               HADDR = HADDR_base | {cmd_counter, {2{1'b0}}};

   assign               strb_num = rd_burst_size[7-1:2];

   assign               HBURST_pre =

                  strb_num == 'd16 ? BURST_INCR16 :

                  strb_num == 'd8  ? BURST_INCR8  :

                  strb_num == 'd4  ? BURST_INCR4  : BURST_SINGLE;

   assign               HSIZE_pre =

                  rd_burst_size == 'd1 ? 2'b00 :

                  rd_burst_size == 'd2 ? 2'b01 :

                  rd_burst_size == 'd4 ? 2'b10 : 2;

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

   cmd_fifo(

        .clk(clk),

        .reset(reset),

        .push(rd_burst_start),

        .pop(cmd_pop),

        .din({rd_burst_addr,

          HBURST_pre,

          HSIZE_pre,

          rd_cmd_port,

          rd_ch_num,

          rd_line_cmd

          }),

        .dout({HADDR_base,

           HBURST,

           HSIZE,

           rd_port_num,

           rd_ch_num_out_cmd,

           ahb_cmd_line

           }),

        .empty(cmd_empty),

        .full(cmd_full)

        );

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

   cmd_data_fifo(

         .clk(clk),

         .reset(reset),

         .push(rd_burst_start),

         .pop(ahb_data_last),

         .din({rd_ch_num,

               HSIZE_pre,

               load_req_in_prog,

               rd_line_cmd

               }),

         .dout({rd_ch_num_out_data,

            HSIZE_data,

            load_data_in_prog,

            rd_line_out

            }),

         .empty(cmd_data_empty),

         .full(cmd_data_full)

         );

   assign               port_change     = 1'b0;

   assign               port_change_end = 1'b0;

   dma_ahb32_core0_ahbm_timeout  dma_ahb32_core0_ahbm_timeout (

                             .clk(clk),

                             .reset(reset),

                             .HTRANS(HTRANS),

                             .HREADY(HREADY),

                             .ahb_timeout(ahb_rd_timeout)

                             );

   assign                     ahb_rd_timeout_num = rd_ch_num_out_cmd;

endmodule