Subversion Repositories qaz_libs

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

module

  axis_switch

  #(

    N,      // data bus width in bytes

    I = 1,  // TID width

    D = 1,  // TDEST width

    U = 1   // TUSER width

  )

  (

    input   select,

    axis_if axis_in,

    axis_if axis_out[1:0],

    input   aclk,

    input   aresetn

  );

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

  //

  axis_if #(.N(N), .I(I), .D(D), .U(U)) axis_fanout[1:0](.*);

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

  //

  assign axis_fanout[0].tdata  = axis_in.tdata;

  assign axis_fanout[0].tstrb  = axis_in.tstrb;

  assign axis_fanout[0].tkeep  = axis_in.tkeep;

  assign axis_fanout[0].tlast  = axis_in.tlast;

  assign axis_fanout[0].tid    = axis_in.tid;

  assign axis_fanout[0].tdest  = axis_in.tdest;

  assign axis_fanout[0].tuser  = axis_in.tuser;

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

  //

  assign axis_fanout[1].tdata  = axis_in.tdata;

  assign axis_fanout[1].tstrb  = axis_in.tstrb;

  assign axis_fanout[1].tkeep  = axis_in.tkeep;

  assign axis_fanout[1].tlast  = axis_in.tlast;

  assign axis_fanout[1].tid    = axis_in.tid;

  assign axis_fanout[1].tdest  = axis_in.tdest;

  assign axis_fanout[1].tuser  = axis_in.tuser;

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

  //

  assign axis_in.tready = select ? axis_fanout[1].tready : axis_fanout[0].tready;

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

  //

  assign axis_fanout[0].tvalid = axis_in.tvalid & (select == 0);

  assign axis_fanout[1].tvalid = axis_in.tvalid & (select == 1);

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

  //

  defparam axis_register_slice_lo.N = N; // why are these needed for recursive modules?

  defparam axis_register_slice_lo.I = I;

  defparam axis_register_slice_lo.D = D;

  defparam axis_register_slice_lo.U = U;

  defparam axis_register_slice_lo.USE_TSTRB = 0;

  defparam axis_register_slice_lo.USE_TKEEP = 0;

  axis_register_slice

    // #(

      // .N(N),

      // .I(I),

      // .D(D),

      // .U(U),

      // .USE_TSTRB(0),

      // .USE_TKEEP(0)

    // )

    axis_register_slice_lo

    (

      .axis_in(axis_fanout[0]),

      .axis_out(axis_out[0]),

      .*

    );

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

  //

  // why does questasim need these for recursive modules?

  defparam axis_register_slice_hi.N = N;

  defparam axis_register_slice_hi.I = I;

  defparam axis_register_slice_hi.D = D;

  defparam axis_register_slice_hi.U = U;

  defparam axis_register_slice_hi.USE_TSTRB = 0;

  defparam axis_register_slice_hi.USE_TKEEP = 0;

  axis_register_slice

    // #(

      // .N(N),

      // .I(I),

      // .D(D),

      // .U(U),

      // .USE_TSTRB(0),

      // .USE_TKEEP(0)

    // )

    axis_register_slice_hi

    (

      .axis_in(axis_fanout[1]),

      .axis_out(axis_out[1]),

      .*

    );

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

//

endmodule