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239 lines
8.0 KiB
Python
Executable File
239 lines
8.0 KiB
Python
Executable File
#!/usr/bin/env python
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"""
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Generates an arbitrated IP mux with the specified number of ports
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"""
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from __future__ import print_function
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import argparse
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import math
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from jinja2 import Template
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def main():
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parser = argparse.ArgumentParser(description=__doc__.strip())
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parser.add_argument('-p', '--ports', type=int, default=4, help="number of ports")
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parser.add_argument('-n', '--name', type=str, help="module name")
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parser.add_argument('-o', '--output', type=str, help="output file name")
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args = parser.parse_args()
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try:
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generate(**args.__dict__)
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except IOError as ex:
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print(ex)
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exit(1)
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def generate(ports=4, name=None, output=None):
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if name is None:
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name = "ip_arb_mux_{0}".format(ports)
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if output is None:
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output = name + ".v"
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print("Opening file '{0}'...".format(output))
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output_file = open(output, 'w')
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print("Generating {0} port IP arbitrated mux {1}...".format(ports, name))
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select_width = int(math.ceil(math.log(ports, 2)))
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t = Template(u"""/*
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Copyright (c) 2014-2017 Alex Forencich
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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// Language: Verilog 2001
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`timescale 1ns / 1ps
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/*
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* IP {{n}} port arbitrated multiplexer
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*/
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module {{name}} #
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(
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// arbitration type: "PRIORITY" or "ROUND_ROBIN"
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parameter ARB_TYPE = "PRIORITY",
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// LSB priority: "LOW", "HIGH"
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parameter LSB_PRIORITY = "HIGH"
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)
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(
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input wire clk,
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input wire rst,
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/*
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* IP frame inputs
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*/
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{%- for p in ports %}
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input wire input_{{p}}_ip_hdr_valid,
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output wire input_{{p}}_ip_hdr_ready,
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input wire [47:0] input_{{p}}_eth_dest_mac,
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input wire [47:0] input_{{p}}_eth_src_mac,
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input wire [15:0] input_{{p}}_eth_type,
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input wire [3:0] input_{{p}}_ip_version,
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input wire [3:0] input_{{p}}_ip_ihl,
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input wire [5:0] input_{{p}}_ip_dscp,
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input wire [1:0] input_{{p}}_ip_ecn,
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input wire [15:0] input_{{p}}_ip_length,
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input wire [15:0] input_{{p}}_ip_identification,
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input wire [2:0] input_{{p}}_ip_flags,
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input wire [12:0] input_{{p}}_ip_fragment_offset,
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input wire [7:0] input_{{p}}_ip_ttl,
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input wire [7:0] input_{{p}}_ip_protocol,
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input wire [15:0] input_{{p}}_ip_header_checksum,
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input wire [31:0] input_{{p}}_ip_source_ip,
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input wire [31:0] input_{{p}}_ip_dest_ip,
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input wire [7:0] input_{{p}}_ip_payload_tdata,
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input wire input_{{p}}_ip_payload_tvalid,
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output wire input_{{p}}_ip_payload_tready,
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input wire input_{{p}}_ip_payload_tlast,
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input wire input_{{p}}_ip_payload_tuser,
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{% endfor %}
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/*
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* IP frame output
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*/
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output wire output_ip_hdr_valid,
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input wire output_ip_hdr_ready,
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output wire [47:0] output_eth_dest_mac,
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output wire [47:0] output_eth_src_mac,
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output wire [15:0] output_eth_type,
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output wire [3:0] output_ip_version,
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output wire [3:0] output_ip_ihl,
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output wire [5:0] output_ip_dscp,
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output wire [1:0] output_ip_ecn,
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output wire [15:0] output_ip_length,
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output wire [15:0] output_ip_identification,
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output wire [2:0] output_ip_flags,
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output wire [12:0] output_ip_fragment_offset,
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output wire [7:0] output_ip_ttl,
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output wire [7:0] output_ip_protocol,
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output wire [15:0] output_ip_header_checksum,
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output wire [31:0] output_ip_source_ip,
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output wire [31:0] output_ip_dest_ip,
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output wire [7:0] output_ip_payload_tdata,
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output wire output_ip_payload_tvalid,
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input wire output_ip_payload_tready,
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output wire output_ip_payload_tlast,
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output wire output_ip_payload_tuser
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);
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wire [{{n-1}}:0] request;
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wire [{{n-1}}:0] acknowledge;
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wire [{{n-1}}:0] grant;
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wire grant_valid;
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wire [{{w-1}}:0] grant_encoded;
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{% for p in ports %}
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assign acknowledge[{{p}}] = input_{{p}}_ip_payload_tvalid & input_{{p}}_ip_payload_tready & input_{{p}}_ip_payload_tlast;
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assign request[{{p}}] = input_{{p}}_ip_hdr_valid;
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{%- endfor %}
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// mux instance
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ip_mux_{{n}}
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mux_inst (
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.clk(clk),
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.rst(rst),
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{%- for p in ports %}
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.input_{{p}}_ip_hdr_valid(input_{{p}}_ip_hdr_valid & grant[{{p}}]),
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.input_{{p}}_ip_hdr_ready(input_{{p}}_ip_hdr_ready),
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.input_{{p}}_eth_dest_mac(input_{{p}}_eth_dest_mac),
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.input_{{p}}_eth_src_mac(input_{{p}}_eth_src_mac),
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.input_{{p}}_eth_type(input_{{p}}_eth_type),
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.input_{{p}}_ip_version(input_{{p}}_ip_version),
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.input_{{p}}_ip_ihl(input_{{p}}_ip_ihl),
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.input_{{p}}_ip_dscp(input_{{p}}_ip_dscp),
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.input_{{p}}_ip_ecn(input_{{p}}_ip_ecn),
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.input_{{p}}_ip_length(input_{{p}}_ip_length),
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.input_{{p}}_ip_identification(input_{{p}}_ip_identification),
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.input_{{p}}_ip_flags(input_{{p}}_ip_flags),
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.input_{{p}}_ip_fragment_offset(input_{{p}}_ip_fragment_offset),
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.input_{{p}}_ip_ttl(input_{{p}}_ip_ttl),
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.input_{{p}}_ip_protocol(input_{{p}}_ip_protocol),
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.input_{{p}}_ip_header_checksum(input_{{p}}_ip_header_checksum),
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.input_{{p}}_ip_source_ip(input_{{p}}_ip_source_ip),
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.input_{{p}}_ip_dest_ip(input_{{p}}_ip_dest_ip),
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.input_{{p}}_ip_payload_tdata(input_{{p}}_ip_payload_tdata),
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.input_{{p}}_ip_payload_tvalid(input_{{p}}_ip_payload_tvalid & grant[{{p}}]),
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.input_{{p}}_ip_payload_tready(input_{{p}}_ip_payload_tready),
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.input_{{p}}_ip_payload_tlast(input_{{p}}_ip_payload_tlast),
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.input_{{p}}_ip_payload_tuser(input_{{p}}_ip_payload_tuser),
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{%- endfor %}
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.output_ip_hdr_valid(output_ip_hdr_valid),
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.output_ip_hdr_ready(output_ip_hdr_ready),
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.output_eth_dest_mac(output_eth_dest_mac),
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.output_eth_src_mac(output_eth_src_mac),
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.output_eth_type(output_eth_type),
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.output_ip_version(output_ip_version),
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.output_ip_ihl(output_ip_ihl),
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.output_ip_dscp(output_ip_dscp),
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.output_ip_ecn(output_ip_ecn),
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.output_ip_length(output_ip_length),
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.output_ip_identification(output_ip_identification),
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.output_ip_flags(output_ip_flags),
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.output_ip_fragment_offset(output_ip_fragment_offset),
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.output_ip_ttl(output_ip_ttl),
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.output_ip_protocol(output_ip_protocol),
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.output_ip_header_checksum(output_ip_header_checksum),
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.output_ip_source_ip(output_ip_source_ip),
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.output_ip_dest_ip(output_ip_dest_ip),
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.output_ip_payload_tdata(output_ip_payload_tdata),
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.output_ip_payload_tvalid(output_ip_payload_tvalid),
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.output_ip_payload_tready(output_ip_payload_tready),
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.output_ip_payload_tlast(output_ip_payload_tlast),
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.output_ip_payload_tuser(output_ip_payload_tuser),
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.enable(grant_valid),
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.select(grant_encoded)
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);
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// arbiter instance
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arbiter #(
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.PORTS({{n}}),
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.TYPE(ARB_TYPE),
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.BLOCK("ACKNOWLEDGE"),
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.LSB_PRIORITY(LSB_PRIORITY)
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)
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arb_inst (
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.clk(clk),
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.rst(rst),
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.request(request),
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.acknowledge(acknowledge),
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.grant(grant),
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.grant_valid(grant_valid),
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.grant_encoded(grant_encoded)
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);
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endmodule
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""")
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output_file.write(t.render(
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n=ports,
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w=select_width,
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name=name,
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ports=range(ports)
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))
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print("Done")
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if __name__ == "__main__":
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main()
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