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[/] [qaz_libs/] [trunk/] [axi4_lite_lib/] [src/] [axi4_lite_register_file.sv] - Blame information for rev 31

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1 29 qaztronic
//////////////////////////////////////////////////////////////////////
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////                                                              ////
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//// Copyright (C) 2015 Authors and OPENCORES.ORG                 ////
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////                                                              ////
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//// This source file may be used and distributed without         ////
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//// restriction provided that this copyright statement is not    ////
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//// removed from the file and that any derivative work contains  ////
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//// the original copyright notice and the associated disclaimer. ////
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////                                                              ////
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//// This source file is free software; you can redistribute it   ////
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//// and/or modify it under the terms of the GNU Lesser General   ////
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//// Public License as published by the Free Software Foundation; ////
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//// either version 2.1 of the License, or (at your option) any   ////
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//// later version.                                               ////
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////                                                              ////
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//// This source is distributed in the hope that it will be       ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
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//// PURPOSE.  See the GNU Lesser General Public License for more ////
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//// details.                                                     ////
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////                                                              ////
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//// You should have received a copy of the GNU Lesser General    ////
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//// Public License along with this source; if not, download it   ////
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//// from http://www.opencores.org/lgpl.shtml                     ////
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////                                                              ////
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//////////////////////////////////////////////////////////////////////
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module
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  axi4_lite_register_file
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  #(
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    A   = 32,     //  address bus width, must be 32 or greater for axi lite
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    N   = 8,      //  data bus width in bytes, must be 4 or 8 for axi lite
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    I   = 1,      //  ID width
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    MW  = 3       //  mux select width
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  )
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  (
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    axi4_if               axi4_s,
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    axi4_lite_register_if r_if,
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    input                 aclk,
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    input                 aresetn
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  );
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  // --------------------------------------------------------------------
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  //
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  localparam MI = 2 ** MW; //  mux inputs
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  localparam LB = (N == 8) ? 3 : 2;
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  localparam UB = LB + MW - 1;
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  // --------------------------------------------------------------------
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  //
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  wire aw_rd_empty;
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  wire w_rd_empty;
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  wire b_wr_full;
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  wire rf_wr_en = ~aw_rd_empty & ~w_rd_empty & ~b_wr_full;
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  wire aw_rd_en = rf_wr_en;
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  wire w_rd_en = rf_wr_en;
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  wire b_wr_en = rf_wr_en;
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  axi4_if #(.A(A), .N(N), .I(I))
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    axi4_write_fifo(.*);
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  axi4_s_to_write_fifos #(.A(A), .N(N), .I(I), .USE_ADVANCED_PROTOCOL(0))
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    axi4_s_to_write_fifos_i(.*);
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  // --------------------------------------------------------------------
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  //
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  wire register_select [MI-1:0];
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  genvar j;
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  generate
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    for(j = 0; j < MI; j = j + 1)
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    begin: decoder_gen
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      assign register_select[j] = (axi4_write_fifo.awaddr[UB:LB] == j) ? 1 : 0;
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      always_ff @(posedge aclk)
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        if(~aresetn)
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          r_if.register_out[j] <= 0;
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        else if(rf_wr_en & register_select[j])
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          r_if.register_out[j] <= axi4_write_fifo.wdata;
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    end
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  endgenerate
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  // --------------------------------------------------------------------
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  //
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  wire ar_rd_empty;
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  wire r_wr_full;
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  wire rf_rd_en = ~ar_rd_empty & ~r_wr_full;
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  wire ar_rd_en = rf_rd_en;
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  wire r_wr_en = rf_rd_en;
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  axi4_if #(.A(A), .N(N), .I(I))
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    axi4_read_fifo(.*);
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  axi4_s_to_read_fifos #(.A(A), .N(N), .I(I), .USE_ADVANCED_PROTOCOL(0))
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    axi4_s_to_read_fifos_i(.*);
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  // --------------------------------------------------------------------
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  //
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  recursive_mux #(.A(MW), .W(N*8))
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    recursive_mux_i
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    (
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      .select(axi4_read_fifo.araddr[UB:LB]),
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      .data_in(r_if.register_in),
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      .data_out(axi4_read_fifo.rdata)
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    );
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  // --------------------------------------------------------------------
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  //
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  assign axi4_read_fifo.rid   = 0;
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  assign axi4_read_fifo.rlast = 1;
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  assign axi4_read_fifo.rresp = 0;
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  // --------------------------------------------------------------------
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  //
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  assign axi4_write_fifo.bid   = 0;
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  assign axi4_write_fifo.bresp = 0;
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// --------------------------------------------------------------------
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//
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endmodule
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