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/*
* ethernet_params.v
*
* Copyright (C) 2018, 2019, 2020 Mind Chasers Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* function: Ethernet related parameters
*
*/
localparam MTU = 1520; // Ethernet is actually 1500+framing (max 18)
localparam IPG = 96; // Inter-packet Gap Bits
localparam SZ_ETH_HEADER = 14; // w/o VLAN
localparam SZ_IPV4_HEADER = 20; // w/o Options
localparam SZ_UDP_HEADER = 8;
localparam TX_MODE_AN = 3'b000,
TX_MODE_IDLE = 3'b001,
TX_MODE_XMT_PKT = 3'b010, // anything >= to this is a mode where a packet is transmitted
TX_MODE_XMT_METRICS = 3'b011;
TX_MODE_XMT_CUSTOM = 3'b100;
// Note: The Length/Type field is transmitted and received with the high order octet first.
localparam ETHER_TYPE_IPV4 = 16'h0800,
ETHER_TYPE_IPV6 = 16'h86DD,
ETHER_TYPE_ARP = 16'h0806;
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