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599 lines
27 KiB
Verilog
599 lines
27 KiB
Verilog
/*
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Copyright (c) 2014-2018 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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* UDP 4 port demultiplexer
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*/
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module udp_demux_4
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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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* UDP frame input
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*/
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input wire input_udp_hdr_valid,
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output wire input_udp_hdr_ready,
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input wire [47:0] input_eth_dest_mac,
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input wire [47:0] input_eth_src_mac,
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input wire [15:0] input_eth_type,
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input wire [3:0] input_ip_version,
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input wire [3:0] input_ip_ihl,
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input wire [5:0] input_ip_dscp,
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input wire [1:0] input_ip_ecn,
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input wire [15:0] input_ip_length,
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input wire [15:0] input_ip_identification,
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input wire [2:0] input_ip_flags,
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input wire [12:0] input_ip_fragment_offset,
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input wire [7:0] input_ip_ttl,
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input wire [7:0] input_ip_protocol,
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input wire [15:0] input_ip_header_checksum,
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input wire [31:0] input_ip_source_ip,
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input wire [31:0] input_ip_dest_ip,
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input wire [15:0] input_udp_source_port,
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input wire [15:0] input_udp_dest_port,
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input wire [15:0] input_udp_length,
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input wire [15:0] input_udp_checksum,
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input wire [7:0] input_udp_payload_tdata,
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input wire input_udp_payload_tvalid,
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output wire input_udp_payload_tready,
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input wire input_udp_payload_tlast,
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input wire input_udp_payload_tuser,
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/*
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* UDP frame outputs
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*/
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output wire output_0_udp_hdr_valid,
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input wire output_0_udp_hdr_ready,
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output wire [47:0] output_0_eth_dest_mac,
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output wire [47:0] output_0_eth_src_mac,
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output wire [15:0] output_0_eth_type,
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output wire [3:0] output_0_ip_version,
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output wire [3:0] output_0_ip_ihl,
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output wire [5:0] output_0_ip_dscp,
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output wire [1:0] output_0_ip_ecn,
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output wire [15:0] output_0_ip_length,
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output wire [15:0] output_0_ip_identification,
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output wire [2:0] output_0_ip_flags,
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output wire [12:0] output_0_ip_fragment_offset,
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output wire [7:0] output_0_ip_ttl,
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output wire [7:0] output_0_ip_protocol,
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output wire [15:0] output_0_ip_header_checksum,
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output wire [31:0] output_0_ip_source_ip,
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output wire [31:0] output_0_ip_dest_ip,
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output wire [15:0] output_0_udp_source_port,
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output wire [15:0] output_0_udp_dest_port,
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output wire [15:0] output_0_udp_length,
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output wire [15:0] output_0_udp_checksum,
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output wire [7:0] output_0_udp_payload_tdata,
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output wire output_0_udp_payload_tvalid,
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input wire output_0_udp_payload_tready,
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output wire output_0_udp_payload_tlast,
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output wire output_0_udp_payload_tuser,
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output wire output_1_udp_hdr_valid,
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input wire output_1_udp_hdr_ready,
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output wire [47:0] output_1_eth_dest_mac,
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output wire [47:0] output_1_eth_src_mac,
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output wire [15:0] output_1_eth_type,
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output wire [3:0] output_1_ip_version,
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output wire [3:0] output_1_ip_ihl,
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output wire [5:0] output_1_ip_dscp,
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output wire [1:0] output_1_ip_ecn,
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output wire [15:0] output_1_ip_length,
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output wire [15:0] output_1_ip_identification,
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output wire [2:0] output_1_ip_flags,
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output wire [12:0] output_1_ip_fragment_offset,
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output wire [7:0] output_1_ip_ttl,
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output wire [7:0] output_1_ip_protocol,
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output wire [15:0] output_1_ip_header_checksum,
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output wire [31:0] output_1_ip_source_ip,
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output wire [31:0] output_1_ip_dest_ip,
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output wire [15:0] output_1_udp_source_port,
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output wire [15:0] output_1_udp_dest_port,
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output wire [15:0] output_1_udp_length,
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output wire [15:0] output_1_udp_checksum,
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output wire [7:0] output_1_udp_payload_tdata,
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output wire output_1_udp_payload_tvalid,
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input wire output_1_udp_payload_tready,
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output wire output_1_udp_payload_tlast,
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output wire output_1_udp_payload_tuser,
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output wire output_2_udp_hdr_valid,
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input wire output_2_udp_hdr_ready,
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output wire [47:0] output_2_eth_dest_mac,
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output wire [47:0] output_2_eth_src_mac,
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output wire [15:0] output_2_eth_type,
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output wire [3:0] output_2_ip_version,
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output wire [3:0] output_2_ip_ihl,
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output wire [5:0] output_2_ip_dscp,
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output wire [1:0] output_2_ip_ecn,
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output wire [15:0] output_2_ip_length,
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output wire [15:0] output_2_ip_identification,
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output wire [2:0] output_2_ip_flags,
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output wire [12:0] output_2_ip_fragment_offset,
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output wire [7:0] output_2_ip_ttl,
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output wire [7:0] output_2_ip_protocol,
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output wire [15:0] output_2_ip_header_checksum,
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output wire [31:0] output_2_ip_source_ip,
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output wire [31:0] output_2_ip_dest_ip,
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output wire [15:0] output_2_udp_source_port,
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output wire [15:0] output_2_udp_dest_port,
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output wire [15:0] output_2_udp_length,
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output wire [15:0] output_2_udp_checksum,
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output wire [7:0] output_2_udp_payload_tdata,
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output wire output_2_udp_payload_tvalid,
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input wire output_2_udp_payload_tready,
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output wire output_2_udp_payload_tlast,
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output wire output_2_udp_payload_tuser,
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output wire output_3_udp_hdr_valid,
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input wire output_3_udp_hdr_ready,
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output wire [47:0] output_3_eth_dest_mac,
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output wire [47:0] output_3_eth_src_mac,
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output wire [15:0] output_3_eth_type,
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output wire [3:0] output_3_ip_version,
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output wire [3:0] output_3_ip_ihl,
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output wire [5:0] output_3_ip_dscp,
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output wire [1:0] output_3_ip_ecn,
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output wire [15:0] output_3_ip_length,
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output wire [15:0] output_3_ip_identification,
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output wire [2:0] output_3_ip_flags,
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output wire [12:0] output_3_ip_fragment_offset,
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output wire [7:0] output_3_ip_ttl,
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output wire [7:0] output_3_ip_protocol,
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output wire [15:0] output_3_ip_header_checksum,
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output wire [31:0] output_3_ip_source_ip,
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output wire [31:0] output_3_ip_dest_ip,
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output wire [15:0] output_3_udp_source_port,
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output wire [15:0] output_3_udp_dest_port,
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output wire [15:0] output_3_udp_length,
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output wire [15:0] output_3_udp_checksum,
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output wire [7:0] output_3_udp_payload_tdata,
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output wire output_3_udp_payload_tvalid,
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input wire output_3_udp_payload_tready,
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output wire output_3_udp_payload_tlast,
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output wire output_3_udp_payload_tuser,
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/*
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* Control
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*/
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input wire enable,
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input wire [1:0] select
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);
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reg [1:0] select_reg = 2'd0, select_next;
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reg frame_reg = 1'b0, frame_next;
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reg input_udp_hdr_ready_reg = 1'b0, input_udp_hdr_ready_next;
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reg input_udp_payload_tready_reg = 1'b0, input_udp_payload_tready_next;
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reg output_0_udp_hdr_valid_reg = 1'b0, output_0_udp_hdr_valid_next;
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reg output_1_udp_hdr_valid_reg = 1'b0, output_1_udp_hdr_valid_next;
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reg output_2_udp_hdr_valid_reg = 1'b0, output_2_udp_hdr_valid_next;
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reg output_3_udp_hdr_valid_reg = 1'b0, output_3_udp_hdr_valid_next;
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reg [47:0] output_eth_dest_mac_reg = 48'd0, output_eth_dest_mac_next;
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reg [47:0] output_eth_src_mac_reg = 48'd0, output_eth_src_mac_next;
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reg [15:0] output_eth_type_reg = 16'd0, output_eth_type_next;
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reg [3:0] output_ip_version_reg = 4'd0, output_ip_version_next;
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reg [3:0] output_ip_ihl_reg = 4'd0, output_ip_ihl_next;
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reg [5:0] output_ip_dscp_reg = 6'd0, output_ip_dscp_next;
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reg [1:0] output_ip_ecn_reg = 2'd0, output_ip_ecn_next;
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reg [15:0] output_ip_length_reg = 16'd0, output_ip_length_next;
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reg [15:0] output_ip_identification_reg = 16'd0, output_ip_identification_next;
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reg [2:0] output_ip_flags_reg = 3'd0, output_ip_flags_next;
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reg [12:0] output_ip_fragment_offset_reg = 13'd0, output_ip_fragment_offset_next;
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reg [7:0] output_ip_ttl_reg = 8'd0, output_ip_ttl_next;
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reg [7:0] output_ip_protocol_reg = 8'd0, output_ip_protocol_next;
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reg [15:0] output_ip_header_checksum_reg = 16'd0, output_ip_header_checksum_next;
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reg [31:0] output_ip_source_ip_reg = 32'd0, output_ip_source_ip_next;
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reg [31:0] output_ip_dest_ip_reg = 32'd0, output_ip_dest_ip_next;
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reg [15:0] output_udp_source_port_reg = 16'd0, output_udp_source_port_next;
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reg [15:0] output_udp_dest_port_reg = 16'd0, output_udp_dest_port_next;
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reg [15:0] output_udp_length_reg = 16'd0, output_udp_length_next;
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reg [15:0] output_udp_checksum_reg = 16'd0, output_udp_checksum_next;
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// internal datapath
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reg [7:0] output_udp_payload_tdata_int;
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reg output_udp_payload_tvalid_int;
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reg output_udp_payload_tready_int_reg = 1'b0;
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reg output_udp_payload_tlast_int;
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reg output_udp_payload_tuser_int;
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wire output_udp_payload_tready_int_early;
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assign input_udp_hdr_ready = input_udp_hdr_ready_reg;
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assign input_udp_payload_tready = input_udp_payload_tready_reg;
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assign output_0_udp_hdr_valid = output_0_udp_hdr_valid_reg;
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assign output_0_eth_dest_mac = output_eth_dest_mac_reg;
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assign output_0_eth_src_mac = output_eth_src_mac_reg;
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assign output_0_eth_type = output_eth_type_reg;
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assign output_0_ip_version = output_ip_version_reg;
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assign output_0_ip_ihl = output_ip_ihl_reg;
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assign output_0_ip_dscp = output_ip_dscp_reg;
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assign output_0_ip_ecn = output_ip_ecn_reg;
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assign output_0_ip_length = output_ip_length_reg;
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assign output_0_ip_identification = output_ip_identification_reg;
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assign output_0_ip_flags = output_ip_flags_reg;
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assign output_0_ip_fragment_offset = output_ip_fragment_offset_reg;
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assign output_0_ip_ttl = output_ip_ttl_reg;
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assign output_0_ip_protocol = output_ip_protocol_reg;
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assign output_0_ip_header_checksum = output_ip_header_checksum_reg;
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assign output_0_ip_source_ip = output_ip_source_ip_reg;
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assign output_0_ip_dest_ip = output_ip_dest_ip_reg;
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assign output_0_udp_source_port = output_udp_source_port_reg;
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assign output_0_udp_dest_port = output_udp_dest_port_reg;
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assign output_0_udp_length = output_udp_length_reg;
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assign output_0_udp_checksum = output_udp_checksum_reg;
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assign output_1_udp_hdr_valid = output_1_udp_hdr_valid_reg;
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assign output_1_eth_dest_mac = output_eth_dest_mac_reg;
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assign output_1_eth_src_mac = output_eth_src_mac_reg;
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assign output_1_eth_type = output_eth_type_reg;
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assign output_1_ip_version = output_ip_version_reg;
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assign output_1_ip_ihl = output_ip_ihl_reg;
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assign output_1_ip_dscp = output_ip_dscp_reg;
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assign output_1_ip_ecn = output_ip_ecn_reg;
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assign output_1_ip_length = output_ip_length_reg;
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assign output_1_ip_identification = output_ip_identification_reg;
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assign output_1_ip_flags = output_ip_flags_reg;
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assign output_1_ip_fragment_offset = output_ip_fragment_offset_reg;
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assign output_1_ip_ttl = output_ip_ttl_reg;
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assign output_1_ip_protocol = output_ip_protocol_reg;
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assign output_1_ip_header_checksum = output_ip_header_checksum_reg;
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assign output_1_ip_source_ip = output_ip_source_ip_reg;
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assign output_1_ip_dest_ip = output_ip_dest_ip_reg;
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assign output_1_udp_source_port = output_udp_source_port_reg;
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assign output_1_udp_dest_port = output_udp_dest_port_reg;
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assign output_1_udp_length = output_udp_length_reg;
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assign output_1_udp_checksum = output_udp_checksum_reg;
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assign output_2_udp_hdr_valid = output_2_udp_hdr_valid_reg;
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assign output_2_eth_dest_mac = output_eth_dest_mac_reg;
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assign output_2_eth_src_mac = output_eth_src_mac_reg;
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assign output_2_eth_type = output_eth_type_reg;
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assign output_2_ip_version = output_ip_version_reg;
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assign output_2_ip_ihl = output_ip_ihl_reg;
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assign output_2_ip_dscp = output_ip_dscp_reg;
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assign output_2_ip_ecn = output_ip_ecn_reg;
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assign output_2_ip_length = output_ip_length_reg;
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assign output_2_ip_identification = output_ip_identification_reg;
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assign output_2_ip_flags = output_ip_flags_reg;
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assign output_2_ip_fragment_offset = output_ip_fragment_offset_reg;
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assign output_2_ip_ttl = output_ip_ttl_reg;
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assign output_2_ip_protocol = output_ip_protocol_reg;
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assign output_2_ip_header_checksum = output_ip_header_checksum_reg;
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assign output_2_ip_source_ip = output_ip_source_ip_reg;
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assign output_2_ip_dest_ip = output_ip_dest_ip_reg;
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assign output_2_udp_source_port = output_udp_source_port_reg;
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assign output_2_udp_dest_port = output_udp_dest_port_reg;
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assign output_2_udp_length = output_udp_length_reg;
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assign output_2_udp_checksum = output_udp_checksum_reg;
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assign output_3_udp_hdr_valid = output_3_udp_hdr_valid_reg;
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assign output_3_eth_dest_mac = output_eth_dest_mac_reg;
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assign output_3_eth_src_mac = output_eth_src_mac_reg;
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assign output_3_eth_type = output_eth_type_reg;
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assign output_3_ip_version = output_ip_version_reg;
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assign output_3_ip_ihl = output_ip_ihl_reg;
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assign output_3_ip_dscp = output_ip_dscp_reg;
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assign output_3_ip_ecn = output_ip_ecn_reg;
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assign output_3_ip_length = output_ip_length_reg;
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assign output_3_ip_identification = output_ip_identification_reg;
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assign output_3_ip_flags = output_ip_flags_reg;
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assign output_3_ip_fragment_offset = output_ip_fragment_offset_reg;
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assign output_3_ip_ttl = output_ip_ttl_reg;
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assign output_3_ip_protocol = output_ip_protocol_reg;
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assign output_3_ip_header_checksum = output_ip_header_checksum_reg;
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assign output_3_ip_source_ip = output_ip_source_ip_reg;
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assign output_3_ip_dest_ip = output_ip_dest_ip_reg;
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assign output_3_udp_source_port = output_udp_source_port_reg;
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assign output_3_udp_dest_port = output_udp_dest_port_reg;
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assign output_3_udp_length = output_udp_length_reg;
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assign output_3_udp_checksum = output_udp_checksum_reg;
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// mux for output control signals
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reg current_output_udp_hdr_valid;
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reg current_output_udp_hdr_ready;
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reg current_output_tvalid;
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reg current_output_tready;
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always @* begin
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case (select_reg)
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2'd0: begin
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current_output_udp_hdr_valid = output_0_udp_hdr_valid;
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current_output_udp_hdr_ready = output_0_udp_hdr_ready;
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current_output_tvalid = output_0_udp_payload_tvalid;
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current_output_tready = output_0_udp_payload_tready;
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end
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2'd1: begin
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current_output_udp_hdr_valid = output_1_udp_hdr_valid;
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current_output_udp_hdr_ready = output_1_udp_hdr_ready;
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current_output_tvalid = output_1_udp_payload_tvalid;
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current_output_tready = output_1_udp_payload_tready;
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end
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2'd2: begin
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current_output_udp_hdr_valid = output_2_udp_hdr_valid;
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current_output_udp_hdr_ready = output_2_udp_hdr_ready;
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current_output_tvalid = output_2_udp_payload_tvalid;
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current_output_tready = output_2_udp_payload_tready;
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end
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2'd3: begin
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current_output_udp_hdr_valid = output_3_udp_hdr_valid;
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current_output_udp_hdr_ready = output_3_udp_hdr_ready;
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current_output_tvalid = output_3_udp_payload_tvalid;
|
|
current_output_tready = output_3_udp_payload_tready;
|
|
end
|
|
default: begin
|
|
current_output_udp_hdr_valid = 1'b0;
|
|
current_output_udp_hdr_ready = 1'b0;
|
|
current_output_tvalid = 1'b0;
|
|
current_output_tready = 1'b0;
|
|
end
|
|
endcase
|
|
end
|
|
|
|
always @* begin
|
|
select_next = select_reg;
|
|
frame_next = frame_reg;
|
|
|
|
input_udp_hdr_ready_next = input_udp_hdr_ready_reg & ~input_udp_hdr_valid;
|
|
input_udp_payload_tready_next = 1'b0;
|
|
output_0_udp_hdr_valid_next = output_0_udp_hdr_valid_reg & ~output_0_udp_hdr_ready;
|
|
output_1_udp_hdr_valid_next = output_1_udp_hdr_valid_reg & ~output_1_udp_hdr_ready;
|
|
output_2_udp_hdr_valid_next = output_2_udp_hdr_valid_reg & ~output_2_udp_hdr_ready;
|
|
output_3_udp_hdr_valid_next = output_3_udp_hdr_valid_reg & ~output_3_udp_hdr_ready;
|
|
output_eth_dest_mac_next = output_eth_dest_mac_reg;
|
|
output_eth_src_mac_next = output_eth_src_mac_reg;
|
|
output_eth_type_next = output_eth_type_reg;
|
|
output_ip_version_next = output_ip_version_reg;
|
|
output_ip_ihl_next = output_ip_ihl_reg;
|
|
output_ip_dscp_next = output_ip_dscp_reg;
|
|
output_ip_ecn_next = output_ip_ecn_reg;
|
|
output_ip_length_next = output_ip_length_reg;
|
|
output_ip_identification_next = output_ip_identification_reg;
|
|
output_ip_flags_next = output_ip_flags_reg;
|
|
output_ip_fragment_offset_next = output_ip_fragment_offset_reg;
|
|
output_ip_ttl_next = output_ip_ttl_reg;
|
|
output_ip_protocol_next = output_ip_protocol_reg;
|
|
output_ip_header_checksum_next = output_ip_header_checksum_reg;
|
|
output_ip_source_ip_next = output_ip_source_ip_reg;
|
|
output_ip_dest_ip_next = output_ip_dest_ip_reg;
|
|
output_udp_source_port_next = output_udp_source_port_reg;
|
|
output_udp_dest_port_next = output_udp_dest_port_reg;
|
|
output_udp_length_next = output_udp_length_reg;
|
|
output_udp_checksum_next = output_udp_checksum_reg;
|
|
|
|
if (input_udp_payload_tvalid & input_udp_payload_tready) begin
|
|
// end of frame detection
|
|
if (input_udp_payload_tlast) begin
|
|
frame_next = 1'b0;
|
|
end
|
|
end
|
|
|
|
if (~frame_reg & enable & input_udp_hdr_valid & ~current_output_udp_hdr_valid & ~current_output_tvalid) begin
|
|
// start of frame, grab select value
|
|
frame_next = 1'b1;
|
|
select_next = select;
|
|
|
|
input_udp_hdr_ready_next = 1'b1;
|
|
|
|
case (select)
|
|
2'd0: output_0_udp_hdr_valid_next = 1'b1;
|
|
2'd1: output_1_udp_hdr_valid_next = 1'b1;
|
|
2'd2: output_2_udp_hdr_valid_next = 1'b1;
|
|
2'd3: output_3_udp_hdr_valid_next = 1'b1;
|
|
endcase
|
|
output_eth_dest_mac_next = input_eth_dest_mac;
|
|
output_eth_src_mac_next = input_eth_src_mac;
|
|
output_eth_type_next = input_eth_type;
|
|
output_ip_version_next = input_ip_version;
|
|
output_ip_ihl_next = input_ip_ihl;
|
|
output_ip_dscp_next = input_ip_dscp;
|
|
output_ip_ecn_next = input_ip_ecn;
|
|
output_ip_length_next = input_ip_length;
|
|
output_ip_identification_next = input_ip_identification;
|
|
output_ip_flags_next = input_ip_flags;
|
|
output_ip_fragment_offset_next = input_ip_fragment_offset;
|
|
output_ip_ttl_next = input_ip_ttl;
|
|
output_ip_protocol_next = input_ip_protocol;
|
|
output_ip_header_checksum_next = input_ip_header_checksum;
|
|
output_ip_source_ip_next = input_ip_source_ip;
|
|
output_ip_dest_ip_next = input_ip_dest_ip;
|
|
output_udp_source_port_next = input_udp_source_port;
|
|
output_udp_dest_port_next = input_udp_dest_port;
|
|
output_udp_length_next = input_udp_length;
|
|
output_udp_checksum_next = input_udp_checksum;
|
|
end
|
|
|
|
input_udp_payload_tready_next = output_udp_payload_tready_int_early & frame_next;
|
|
|
|
output_udp_payload_tdata_int = input_udp_payload_tdata;
|
|
output_udp_payload_tvalid_int = input_udp_payload_tvalid & input_udp_payload_tready;
|
|
output_udp_payload_tlast_int = input_udp_payload_tlast;
|
|
output_udp_payload_tuser_int = input_udp_payload_tuser;
|
|
end
|
|
|
|
always @(posedge clk) begin
|
|
if (rst) begin
|
|
select_reg <= 2'd0;
|
|
frame_reg <= 1'b0;
|
|
input_udp_hdr_ready_reg <= 1'b0;
|
|
input_udp_payload_tready_reg <= 1'b0;
|
|
output_0_udp_hdr_valid_reg <= 1'b0;
|
|
output_1_udp_hdr_valid_reg <= 1'b0;
|
|
output_2_udp_hdr_valid_reg <= 1'b0;
|
|
output_3_udp_hdr_valid_reg <= 1'b0;
|
|
end else begin
|
|
select_reg <= select_next;
|
|
frame_reg <= frame_next;
|
|
input_udp_hdr_ready_reg <= input_udp_hdr_ready_next;
|
|
input_udp_payload_tready_reg <= input_udp_payload_tready_next;
|
|
output_0_udp_hdr_valid_reg <= output_0_udp_hdr_valid_next;
|
|
output_1_udp_hdr_valid_reg <= output_1_udp_hdr_valid_next;
|
|
output_2_udp_hdr_valid_reg <= output_2_udp_hdr_valid_next;
|
|
output_3_udp_hdr_valid_reg <= output_3_udp_hdr_valid_next;
|
|
end
|
|
|
|
output_eth_dest_mac_reg <= output_eth_dest_mac_next;
|
|
output_eth_src_mac_reg <= output_eth_src_mac_next;
|
|
output_eth_type_reg <= output_eth_type_next;
|
|
output_ip_version_reg <= output_ip_version_next;
|
|
output_ip_ihl_reg <= output_ip_ihl_next;
|
|
output_ip_dscp_reg <= output_ip_dscp_next;
|
|
output_ip_ecn_reg <= output_ip_ecn_next;
|
|
output_ip_length_reg <= output_ip_length_next;
|
|
output_ip_identification_reg <= output_ip_identification_next;
|
|
output_ip_flags_reg <= output_ip_flags_next;
|
|
output_ip_fragment_offset_reg <= output_ip_fragment_offset_next;
|
|
output_ip_ttl_reg <= output_ip_ttl_next;
|
|
output_ip_protocol_reg <= output_ip_protocol_next;
|
|
output_ip_header_checksum_reg <= output_ip_header_checksum_next;
|
|
output_ip_source_ip_reg <= output_ip_source_ip_next;
|
|
output_ip_dest_ip_reg <= output_ip_dest_ip_next;
|
|
output_udp_source_port_reg <= output_udp_source_port_next;
|
|
output_udp_dest_port_reg <= output_udp_dest_port_next;
|
|
output_udp_length_reg <= output_udp_length_next;
|
|
output_udp_checksum_reg <= output_udp_checksum_next;
|
|
end
|
|
|
|
// output datapath logic
|
|
reg [7:0] output_udp_payload_tdata_reg = 8'd0;
|
|
reg output_0_udp_payload_tvalid_reg = 1'b0, output_0_udp_payload_tvalid_next;
|
|
reg output_1_udp_payload_tvalid_reg = 1'b0, output_1_udp_payload_tvalid_next;
|
|
reg output_2_udp_payload_tvalid_reg = 1'b0, output_2_udp_payload_tvalid_next;
|
|
reg output_3_udp_payload_tvalid_reg = 1'b0, output_3_udp_payload_tvalid_next;
|
|
reg output_udp_payload_tlast_reg = 1'b0;
|
|
reg output_udp_payload_tuser_reg = 1'b0;
|
|
|
|
reg [7:0] temp_udp_payload_tdata_reg = 8'd0;
|
|
reg temp_udp_payload_tvalid_reg = 1'b0, temp_udp_payload_tvalid_next;
|
|
reg temp_udp_payload_tlast_reg = 1'b0;
|
|
reg temp_udp_payload_tuser_reg = 1'b0;
|
|
|
|
// datapath control
|
|
reg store_udp_payload_int_to_output;
|
|
reg store_udp_payload_int_to_temp;
|
|
reg store_udp_payload_temp_to_output;
|
|
|
|
assign output_0_udp_payload_tdata = output_udp_payload_tdata_reg;
|
|
assign output_0_udp_payload_tvalid = output_0_udp_payload_tvalid_reg;
|
|
assign output_0_udp_payload_tlast = output_udp_payload_tlast_reg;
|
|
assign output_0_udp_payload_tuser = output_udp_payload_tuser_reg;
|
|
|
|
assign output_1_udp_payload_tdata = output_udp_payload_tdata_reg;
|
|
assign output_1_udp_payload_tvalid = output_1_udp_payload_tvalid_reg;
|
|
assign output_1_udp_payload_tlast = output_udp_payload_tlast_reg;
|
|
assign output_1_udp_payload_tuser = output_udp_payload_tuser_reg;
|
|
|
|
assign output_2_udp_payload_tdata = output_udp_payload_tdata_reg;
|
|
assign output_2_udp_payload_tvalid = output_2_udp_payload_tvalid_reg;
|
|
assign output_2_udp_payload_tlast = output_udp_payload_tlast_reg;
|
|
assign output_2_udp_payload_tuser = output_udp_payload_tuser_reg;
|
|
|
|
assign output_3_udp_payload_tdata = output_udp_payload_tdata_reg;
|
|
assign output_3_udp_payload_tvalid = output_3_udp_payload_tvalid_reg;
|
|
assign output_3_udp_payload_tlast = output_udp_payload_tlast_reg;
|
|
assign output_3_udp_payload_tuser = output_udp_payload_tuser_reg;
|
|
|
|
// enable ready input next cycle if output is ready or the temp reg will not be filled on the next cycle (output reg empty or no input)
|
|
assign output_udp_payload_tready_int_early = current_output_tready | (~temp_udp_payload_tvalid_reg & (~current_output_tvalid | ~output_udp_payload_tvalid_int));
|
|
|
|
always @* begin
|
|
// transfer sink ready state to source
|
|
output_0_udp_payload_tvalid_next = output_0_udp_payload_tvalid_reg;
|
|
output_1_udp_payload_tvalid_next = output_1_udp_payload_tvalid_reg;
|
|
output_2_udp_payload_tvalid_next = output_2_udp_payload_tvalid_reg;
|
|
output_3_udp_payload_tvalid_next = output_3_udp_payload_tvalid_reg;
|
|
temp_udp_payload_tvalid_next = temp_udp_payload_tvalid_reg;
|
|
|
|
store_udp_payload_int_to_output = 1'b0;
|
|
store_udp_payload_int_to_temp = 1'b0;
|
|
store_udp_payload_temp_to_output = 1'b0;
|
|
|
|
if (output_udp_payload_tready_int_reg) begin
|
|
// input is ready
|
|
if (current_output_tready | ~current_output_tvalid) begin
|
|
// output is ready or currently not valid, transfer data to output
|
|
output_0_udp_payload_tvalid_next = output_udp_payload_tvalid_int & (select_reg == 2'd0);
|
|
output_1_udp_payload_tvalid_next = output_udp_payload_tvalid_int & (select_reg == 2'd1);
|
|
output_2_udp_payload_tvalid_next = output_udp_payload_tvalid_int & (select_reg == 2'd2);
|
|
output_3_udp_payload_tvalid_next = output_udp_payload_tvalid_int & (select_reg == 2'd3);
|
|
store_udp_payload_int_to_output = 1'b1;
|
|
end else begin
|
|
// output is not ready, store input in temp
|
|
temp_udp_payload_tvalid_next = output_udp_payload_tvalid_int;
|
|
store_udp_payload_int_to_temp = 1'b1;
|
|
end
|
|
end else if (current_output_tready) begin
|
|
// input is not ready, but output is ready
|
|
output_0_udp_payload_tvalid_next = temp_udp_payload_tvalid_reg & (select_reg == 2'd0);
|
|
output_1_udp_payload_tvalid_next = temp_udp_payload_tvalid_reg & (select_reg == 2'd1);
|
|
output_2_udp_payload_tvalid_next = temp_udp_payload_tvalid_reg & (select_reg == 2'd2);
|
|
output_3_udp_payload_tvalid_next = temp_udp_payload_tvalid_reg & (select_reg == 2'd3);
|
|
temp_udp_payload_tvalid_next = 1'b0;
|
|
store_udp_payload_temp_to_output = 1'b1;
|
|
end
|
|
end
|
|
|
|
always @(posedge clk) begin
|
|
if (rst) begin
|
|
output_0_udp_payload_tvalid_reg <= 1'b0;
|
|
output_1_udp_payload_tvalid_reg <= 1'b0;
|
|
output_2_udp_payload_tvalid_reg <= 1'b0;
|
|
output_3_udp_payload_tvalid_reg <= 1'b0;
|
|
output_udp_payload_tready_int_reg <= 1'b0;
|
|
temp_udp_payload_tvalid_reg <= 1'b0;
|
|
end else begin
|
|
output_0_udp_payload_tvalid_reg <= output_0_udp_payload_tvalid_next;
|
|
output_1_udp_payload_tvalid_reg <= output_1_udp_payload_tvalid_next;
|
|
output_2_udp_payload_tvalid_reg <= output_2_udp_payload_tvalid_next;
|
|
output_3_udp_payload_tvalid_reg <= output_3_udp_payload_tvalid_next;
|
|
output_udp_payload_tready_int_reg <= output_udp_payload_tready_int_early;
|
|
temp_udp_payload_tvalid_reg <= temp_udp_payload_tvalid_next;
|
|
end
|
|
|
|
// datapath
|
|
if (store_udp_payload_int_to_output) begin
|
|
output_udp_payload_tdata_reg <= output_udp_payload_tdata_int;
|
|
output_udp_payload_tlast_reg <= output_udp_payload_tlast_int;
|
|
output_udp_payload_tuser_reg <= output_udp_payload_tuser_int;
|
|
end else if (store_udp_payload_temp_to_output) begin
|
|
output_udp_payload_tdata_reg <= temp_udp_payload_tdata_reg;
|
|
output_udp_payload_tlast_reg <= temp_udp_payload_tlast_reg;
|
|
output_udp_payload_tuser_reg <= temp_udp_payload_tuser_reg;
|
|
end
|
|
|
|
if (store_udp_payload_int_to_temp) begin
|
|
temp_udp_payload_tdata_reg <= output_udp_payload_tdata_int;
|
|
temp_udp_payload_tlast_reg <= output_udp_payload_tlast_int;
|
|
temp_udp_payload_tuser_reg <= output_udp_payload_tuser_int;
|
|
end
|
|
end
|
|
|
|
endmodule
|