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diff --git a/source/ethernet_params.v b/source/ethernet_params.v
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+++ b/source/ethernet_params.v
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+/*
+ *       ethernet_params.v
+ *
+ *   Copyright (C) 2018, 2019 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 = 2'b00,
+TX_MODE_IDLE = 2'b01,
+TX_MODE_XMT_PKT = 2'b10,		// anything >= to this is a mode where a packet is transmitted
+TX_MODE_XMT_METRICS = 2'b11;
+
+// 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;