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LAN9500AI Datasheet(PDF) 64 Page - Microchip Technology

Part # LAN9500AI
Description  LAN950x USB 2.0 to 10/100 Ethernet Controller
PDF  213 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN9500AI Datasheet(HTML) 64 Page - Microchip Technology

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LAN950x
DS00001875A-page 64
 2010 - 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 5-10:
RXCOE CHECKSUM CALCULATION
FIGURE 5-11:
TYPE II ETHERNET FRAME
FIGURE 5-12:
ETHERNET FRAME WITH VLAN TAG
DST
SRC
T
Y
P
E
Frame Data
F
C
S
Calculate Checksum
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



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