8101 Datasheet, PDF (22/172 Pages) LSI Computer Systems – Gigabit Ethernet Controller

Figure 2.2 Ethernet MAC Frame Format
a. Frame Format
7 Bytes
Preamble
1 Byte ^{Start of Frame}
Delimiter (SFD)
6 Bytes
6 Bytes
Destination
Address (DA)
Source
Address (SA)
See
Below
Bytes Within
Frame Transmitted
Top to Bottom
2 Bytes Length/Type (L/T)
46–1500 Bytes
Data
4 Bytes ^{Frame Check}
Sequence (FCS)
A0
A7
LSB
MSB
Bits Within
Frame Transmitted
Left to Right
b. Address Field Format
A0
A47
I/G U/L 40-Bit Address
Bits in
Registers 0–2
1 = Multicast or Broadcast
0 = Unicast
1 = Broadcast
0 = Multicast
2-4
Functional Description
Copyright © 2000–2001 by LSI Logic Corporation. All rights reserved.