參數(shù)資料
型號: L84302
元件分類: 通用總線功能
英文描述: L84302 Quad 100/10 Mbps 4-Port Ethernet Controller with RMON/SNMP Management Counters technical manual 4/02
中文描述: L84302四100/10 Mbps的4端口以太網(wǎng)的遠程監(jiān)控控制器/ SNMP管理處的技術手冊,4月2日
文件頁數(shù): 17/128頁
文件大?。?/td> 997K
代理商: L84302
Functional Description
Copyright 1997-2002 by LSI Logic Corporation. All rights reserved.
17 of 128
April, 2002
Figure 3
Ethernet MAC Frame Format
An Ethernet frame is specified by IEEE 802.3 to have a minimum length
of 64 bytes and a maximum length of 1518 bytes, exclusive of the
preamble and SFD. Packets which are less than 64 bytes or greater than
1518 bytes are referred to as undersize and oversize packets,
respectively.
3.2.2 Preamble and SFD
The preamble and SFD is a combined 64-bit field consisting of 62
alternating 1’s and 0’s followed by a 11 end of preamble indicator. The
Preamble
Start of Frame
Delimiter (SFD)
Destination
Address (DA)
Source
Address (SA)
Lenght/Type (L/T)
Data
Frame Check
Sequence (FCS)
7 Bytes
1 Byte
6 Bytes
6 Bytes
2 Bytes
46 - 1500 Bytes
4 Bytes
See
Below
Bits within
Frame Transmitted
Top to Bottom
A0
LSB
A7
MSB
Bits within
Frame Transmitted
Left to Right
a. Frame Format
b. Address Field Format
I/G U/L 40-Bit Address
A0
A47
1 = Broadcast
0 = Multicast
1 = Multicast or Broadcast
0 = Unicast
Bits in
Station Address 0–5 Registers
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