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[/] [qaz_libs/] [trunk/] [axi4_stream_lib/] [src/] [axis_switch.sv] - Blame information for rev 38

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1 36 qaztronic
//////////////////////////////////////////////////////////////////////
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////                                                              ////
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//// Copyright (C) 2017 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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  axis_switch
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  #(
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    N,      // data bus width in bytes
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    I = 1,  // TID width
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    D = 1,  // TDEST width
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    U = 1   // TUSER width
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  )
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  (
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    input   select,
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    axis_if axis_in,
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    axis_if axis_out[1:0],
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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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  axis_if #(.N(N), .I(I), .D(D), .U(U)) axis_fanout[1:0](.*);
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  // --------------------------------------------------------------------
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  //
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  assign axis_fanout[0].tdata  = axis_in.tdata;
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  assign axis_fanout[0].tstrb  = axis_in.tstrb;
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  assign axis_fanout[0].tkeep  = axis_in.tkeep;
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  assign axis_fanout[0].tlast  = axis_in.tlast;
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  assign axis_fanout[0].tid    = axis_in.tid;
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  assign axis_fanout[0].tdest  = axis_in.tdest;
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  assign axis_fanout[0].tuser  = axis_in.tuser;
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  // --------------------------------------------------------------------
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  //
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  assign axis_fanout[1].tdata  = axis_in.tdata;
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  assign axis_fanout[1].tstrb  = axis_in.tstrb;
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  assign axis_fanout[1].tkeep  = axis_in.tkeep;
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  assign axis_fanout[1].tlast  = axis_in.tlast;
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  assign axis_fanout[1].tid    = axis_in.tid;
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  assign axis_fanout[1].tdest  = axis_in.tdest;
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  assign axis_fanout[1].tuser  = axis_in.tuser;
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  // --------------------------------------------------------------------
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  //
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  assign axis_in.tready = select ? axis_fanout[1].tready : axis_fanout[0].tready;
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  // --------------------------------------------------------------------
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  //
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  assign axis_fanout[0].tvalid = axis_in.tvalid & (select == 0);
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  assign axis_fanout[1].tvalid = axis_in.tvalid & (select == 1);
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  // --------------------------------------------------------------------
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  //
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  defparam axis_register_slice_lo.N = N; // why are these needed for recursive modules?
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  defparam axis_register_slice_lo.I = I;
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  defparam axis_register_slice_lo.D = D;
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  defparam axis_register_slice_lo.U = U;
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  defparam axis_register_slice_lo.USE_TSTRB = 0;
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  defparam axis_register_slice_lo.USE_TKEEP = 0;
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  axis_register_slice
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    // #(
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      // .N(N),
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      // .I(I),
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      // .D(D),
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      // .U(U),
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      // .USE_TSTRB(0),
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      // .USE_TKEEP(0)
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    // )
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    axis_register_slice_lo
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    (
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      .axis_in(axis_fanout[0]),
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      .axis_out(axis_out[0]),
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      .*
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    );
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  // --------------------------------------------------------------------
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  //
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  // why does questasim need these for recursive modules?
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  defparam axis_register_slice_hi.N = N;
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  defparam axis_register_slice_hi.I = I;
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  defparam axis_register_slice_hi.D = D;
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  defparam axis_register_slice_hi.U = U;
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  defparam axis_register_slice_hi.USE_TSTRB = 0;
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  defparam axis_register_slice_hi.USE_TKEEP = 0;
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  axis_register_slice
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    // #(
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      // .N(N),
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      // .I(I),
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      // .D(D),
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      // .U(U),
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      // .USE_TSTRB(0),
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      // .USE_TKEEP(0)
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    // )
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    axis_register_slice_hi
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    (
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      .axis_in(axis_fanout[1]),
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      .axis_out(axis_out[1]),
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      .*
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    );
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// --------------------------------------------------------------------
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//
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endmodule
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