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LAN89730 Fiches technique(PDF) 70 Page - Microchip Technology

No de pièce LAN89730
Description  Implements Reduced Power Operating Modes
PDF  218 Pages
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Fabricant  MICROCHIP [Microchip Technology]
Site Internet  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN89730 Fiches technique(HTML) 70 Page - Microchip Technology

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LAN89730
DS60001348A-page 70
 2013-2015 Microchip Technology Inc.
In mode 1, the RXCOE supports VLAN tags and a SNAP header. In this mode, the RXCOE calculates the checksum at
the start of L3 packet. The VLAN1 tag register is used by the RXCOE to indicate what protocol type is to be used to
indicate the existence of a VLAN tag. This value is typically 8100h.
Example frame configurations:
FIGURE 4-11:
TYPE II ETHERNET FRAME
FIGURE 4-12:
ETHERNET FRAME WITH VLAN TAG
FIGURE 4-13:
ETHERNET FRAME WITH LENGTH FIELD AND SNAP HEADER
DST
SRC
p
r
o
t
0
1
2
3
L3 Packet
F
C
S
Calculate Checksum
1DWORD
DST
SRC
8
1
0
0
V
I
D
0
1
2
3
t
y
p
e
4
L3 Packet
F
C
S
Calculate Checksum
1DWORD
DST
SRC
L3 Packet
F
C
S
S
N
A
P
0
S
N
A
P
1
L
e
n
0
1
2
{DSAP, SSAP, CTRL, OUI[23:16]}
{OUI[15:0], PID[15:0]}
3
4
5
Calculate Checksum
1DWORD



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