text: #!/usr/bin/env python
  """
  Generates an AXI Stream mux wrapper with the specified number of ports
  """
  
  from __future__ import print_function
  
  import argparse
  import math
  from jinja2 import Template
  
  def main():
      parser = argparse.ArgumentParser(description=__doc__.strip())
      parser.add_argument('-p', '--ports',  type=int, default=4, help="number of ports")
      parser.add_argument('-n', '--name',   type=str, help="module name")
      parser.add_argument('-o', '--output', type=str, help="output file name")
  
      args = parser.parse_args()
  
      try:
          generate(**args.__dict__)
      except IOError as ex:
          print(ex)
          exit(1)
  
  def generate(ports=4, name=None, output=None):
      n = ports
  
      if name is None:
          name = "axis_mux_wrap_{0}".format(n)
  
      if output is None:
          output = name + ".v"
  
      print("Opening file '{0}'...".format(output))
  
      output_file = open(output, 'w')
  
      print("Generating {0} port AXI stream mux wrapper {1}...".format(n, name))
  
      cn = int(math.ceil(math.log(n, 2)))
  
      t = Template(u"""/*
  
  Copyright (c) 2018 Alex Forencich
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
  
  */
  
  // Language: Verilog 2001
  
  `timescale 1ns / 1ps
  
  /*
   * AXI4-Stream {{n}} port mux (wrapper)
   */
  module {{name}} #
  (
      // Width of AXI stream interfaces in bits
      parameter DATA_WIDTH = 8,
      // Propagate tkeep signal
      parameter KEEP_ENABLE = (DATA_WIDTH>8),
      // tkeep signal width (words per cycle)
      parameter KEEP_WIDTH = (DATA_WIDTH/8),
      // Propagate tid signal
      parameter ID_ENABLE = 0,
      // tid signal width
      parameter ID_WIDTH = 8,
      // Propagate tdest signal
      parameter DEST_ENABLE = 0,
      // tdest signal width
      parameter DEST_WIDTH = 8,
      // Propagate tuser signal
      parameter USER_ENABLE = 1,
      // tuser signal width
      parameter USER_WIDTH = 1
  )
  (
      input  wire                  clk,
      input  wire                  rst,
  
      /*
       * AXI Stream inputs
       */
  {%- for p in range(n) %}
      input  wire [DATA_WIDTH-1:0] s{{'%02d'%p}}_axis_tdata,
      input  wire [KEEP_WIDTH-1:0] s{{'%02d'%p}}_axis_tkeep,
      input  wire                  s{{'%02d'%p}}_axis_tvalid,
      output wire                  s{{'%02d'%p}}_axis_tready,
      input  wire                  s{{'%02d'%p}}_axis_tlast,
      input  wire [ID_WIDTH-1:0]   s{{'%02d'%p}}_axis_tid,
      input  wire [DEST_WIDTH-1:0] s{{'%02d'%p}}_axis_tdest,
      input  wire [USER_WIDTH-1:0] s{{'%02d'%p}}_axis_tuser,
  {% endfor %}
      /*
       * AXI Stream output
       */
      output wire [DATA_WIDTH-1:0] m_axis_tdata,
      output wire [KEEP_WIDTH-1:0] m_axis_tkeep,
      output wire                  m_axis_tvalid,
      input  wire                  m_axis_tready,
      output wire                  m_axis_tlast,
      output wire [ID_WIDTH-1:0]   m_axis_tid,
      output wire [DEST_WIDTH-1:0] m_axis_tdest,
      output wire [USER_WIDTH-1:0] m_axis_tuser,
  
      /*
       * Control
       */
      input  wire                  enable,
      input  wire [{{cn-1}}:0]            select
  );
  
  axis_mux #(
      .S_COUNT({{n}}),
      .DATA_WIDTH(DATA_WIDTH),
      .KEEP_ENABLE(KEEP_ENABLE),
      .KEEP_WIDTH(KEEP_WIDTH),
      .ID_ENABLE(ID_ENABLE),
      .ID_WIDTH(ID_WIDTH),
      .DEST_ENABLE(DEST_ENABLE),
      .DEST_WIDTH(DEST_WIDTH),
      .USER_ENABLE(USER_ENABLE),
      .USER_WIDTH(USER_WIDTH)
  )
  axis_mux_inst (
      .clk(clk),
      .rst(rst),
      // AXI inputs
      .s_axis_tdata({ {% for p in range(n-1,-1,-1) %}s{{'%02d'%p}}_axis_tdata{% if not loop.last %}, {% endif %}{% endfor %} }),
      .s_axis_tkeep({ {% for p in range(n-1,-1,-1) %}s{{'%02d'%p}}_axis_tkeep{% if not loop.last %}, {% endif %}{% endfor %} }),
      .s_axis_tvalid({ {% for p in range(n-1,-1,-1) %}s{{'%02d'%p}}_axis_tvalid{% if not loop.last %}, {% endif %}{% endfor %} }),
      .s_axis_tready({ {% for p in range(n-1,-1,-1) %}s{{'%02d'%p}}_axis_tready{% if not loop.last %}, {% endif %}{% endfor %} }),
      .s_axis_tlast({ {% for p in range(n-1,-1,-1) %}s{{'%02d'%p}}_axis_tlast{% if not loop.last %}, {% endif %}{% endfor %} }),
      .s_axis_tid({ {% for p in range(n-1,-1,-1) %}s{{'%02d'%p}}_axis_tid{% if not loop.last %}, {% endif %}{% endfor %} }),
      .s_axis_tdest({ {% for p in range(n-1,-1,-1) %}s{{'%02d'%p}}_axis_tdest{% if not loop.last %}, {% endif %}{% endfor %} }),
      .s_axis_tuser({ {% for p in range(n-1,-1,-1) %}s{{'%02d'%p}}_axis_tuser{% if not loop.last %}, {% endif %}{% endfor %} }),
      // AXI output
      .m_axis_tdata(m_axis_tdata),
      .m_axis_tkeep(m_axis_tkeep),
      .m_axis_tvalid(m_axis_tvalid),
      .m_axis_tready(m_axis_tready),
      .m_axis_tlast(m_axis_tlast),
      .m_axis_tid(m_axis_tid),
      .m_axis_tdest(m_axis_tdest),
      .m_axis_tuser(m_axis_tuser),
      // Control
      .enable(enable),
      .select(select)
  );
  
  endmodule
  
  """)
  
      output_file.write(t.render(
          n=n,
          cn=cn,
          name=name
      ))
  
      print("Done")
  
  if __name__ == "__main__":
      main()
  
  