lan9211 Standard Microsystems Corp., lan9211 Datasheet - Page 29

• Manufacturer Part Number: lan9211
• Description: Lan9211 High-performance Small Form Factor Single-chip Ethernet Controller With Hp Auto-mdix Support
• Manufacturer: Standard Microsystems Corp.

High-Performance Small Form Factor Single-Chip Ethernet Controller with HP Auto-MDIX Support
Datasheet
SMSC LAN9211
1DWORD
{DSAP, SSAP, CTRL, OUI[23:16]}
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:
1DWORD
DST
0
1DWORD
DST
0
DST
0
1
SRC
1
1
SRC
2
Figure 3.7 Ethernet Frame with Length Field and SNAP Header
SRC
2
2
8
1
0
0
3
p
r
o
t
V
I
D
3
L
e
n
t
y
p
e
3
4
S
N
A
P
0
Figure 3.6 Ethernet Frame with VLAN Tag
4
S
N
A
P
1
Figure 3.5 Type II Ethernet Frame
5
{OUI[15:0], PID[15:0]}
DATASHEET
Calculate Checksum
Calculate Checksum
29
L3 Packet
Calculate Checksum
L3 Packet
L3 Packet
F
C
S
Revision 2.3 (08-06-08)
C
F
S
F
C
S