DS33X41+ Maxim Integrated Products, DS33X41+ Datasheet - Page 70
DS33X41+
Manufacturer Part Number
DS33X41+
Description
IC MAPPING ETHERNET 256CSBGA
Manufacturer
Maxim Integrated Products
Datasheet
1.DS33X11.pdf
(375 pages)
Specifications of DS33X41+
Applications
Data Transport
Interface
Parallel/Serial
Voltage - Supply
1.8V, 2.5V, 3.3V
Package / Case
256-CSBGA
Mounting Type
Surface Mount
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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8.16.4 Priority Coding with Multiple (Q-in-Q) VLAN Tags
Device operation with multiple VLAN tags is similar to operation with a single VLAN tag. The Ethernet Q-in-Q
format is similar to the case outlined above, except that a second VLAN tag is inserted after the Ethernet SA field.
The format of the VLAN Q-in-Q tagged frame is shown in Figure 8-14. Both VLAN tags include a PCP (User
Priority) value and a VLAN ID. The device only makes forwarding and scheduling decisions using the “outer-most”
VLAN tag located in Ethernet bytes # 13-16, and ignores additional tags. The user can configure an alternate
WAN-VLAN Q-in-Q or VLAN Tag Protocol ID (TPID) that is used instead of the default value of 8100 in the
SU.WETPID register. The user can configure an alternate LAN-VLAN Q-in-Q or VLAN Tag Protocol ID (TPID) that
is used instead of the default value of 8100h in the SU.LQTPID register. Some additional common TPIDs are 9100,
9200 and 88A8. See Section 8.16.6 for more information on programming the priority table.
Figure 8-14. VLAN Q-in-Q Field Format
Rev: 063008
Ethernet Byte #
________________________________________________ DS33X162/X161/X82/X81/X42/X41/X11/W41/W11
23+
10
11
12
13
14
15
16
17
18
19
20
21
22
1
2
3
4
5
6
7
8
9
Bit 7
7
7
3 Bit PCP Priority
3 Bit PCP Priority
Bit 6
8 (hex)
0 (hex)
8 (hex)
0 (hex)
Bit 5
Ethernet Type / Length (MSB)
Ethernet Type / Length (LSB)
Destination Address (DA)
Source Address (SA)
Bit 4
CFI
CFI
< Data Unit >
8 bits of VLAN ID
8 bits of VLAN ID
Bit 3
11
11
4 bits of VLAN ID
4 bits of VLAN ID
Bit 2
1 (hex)
0 (hex)
1 (hex)
0 (hex)
Bit 1
Bit 0
8
8
0
0
70 of 375
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