/*
 *       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;