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LAN9220 데이터시트(PDF) 22 Page - Microchip Technology

부품명 LAN9220
상세설명  16-bit Non-PCI Small Form Factor 10/100 Ethernet Controller with Variable Voltage I/O & HP Auto-MDIX Support
PDF  142 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN9220 데이터시트(HTML) 22 Page - Microchip Technology

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LAN9220
DS00002417A-page 22
 2006-2017 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 3-3:
TYPE II ETHERNET FRAME
FIGURE 3-4:
ETHERNET FRAME WITH VLAN TAG
FIGURE 3-5:
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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