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LAN9500AI Fiches technique(PDF) 65 Page - Microchip Technology

No de pièce LAN9500AI
Description  LAN950x USB 2.0 to 10/100 Ethernet Controller
PDF  213 Pages
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Fabricant  MICROCHIP [Microchip Technology]
Site Internet  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN9500AI Fiches technique(HTML) 65 Page - Microchip Technology

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 2010 - 2015 Microchip Technology Inc.
DS00001875A-page 65
LAN950x
The RXCOE supports a maximum of two VLAN tags. If there are more than two VLAN tags, the VLAN protocol identifier
for the third tag is treated as an Ethernet type field. The checksum calculation will begin immediately after the type field.
FIGURE 5-13:
ETHERNET FRAME WITH LENGTH FIELD AND SNAP HEADER
FIGURE 5-14:
ETHERNET FRAME WITH VLAN TAG AND SNAP HEADER
FIGURE 5-15:
ETHERNET FRAME WITH MULTIPLE VLAN TAGS AND SNAP HEADER
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
DST
SRC
8
1
0
0
V
I
D
L3 Packet
F
C
S
S
N
A
P
0
S
N
A
P
1
3
L
e
n
0
1
2
{DSAP, SSAP, CTRL,
OUI[23:16]}
{OUI[15:0], PID[15:0]}
4
5
6
Calculate Checksum
1DWORD
DST
SRC
8
1
0
0
V
I
D
L3 Packet
F
C
S
S
N
A
P
0
S
N
A
P
1
5
L
e
n
0
1
2
{DSAP, SSAP, CTRL,
OUI[23:16]}
{OUI[15:0], PID[15:0]}
6
7
8
Calculate Checksum
8
1
0
0
V
I
D
4
1DWORD



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