ADM6996L-AA-T-1 Lantiq, ADM6996L-AA-T-1 Datasheet - Page 34

• Manufacturer Part Number: ADM6996L-AA-T-1
• Manufacturer: Lantiq

Specifications of ADM6996L-AA-T-1

• Lead Free Status / RoHS Status: Supplier Unconfirmed

Field
Res
Res
VM
MAC
Res
Note:
Below is an example of a VLAN Tag and a MAC application for Bit4 and Bit5.
Below is an old router architecture example. The disadvantages of this are:
1. WAN port only supports 10M Half-Duplex and non-MDIX functions
2. Needs extra 10M NIC cost.
3. ISA bus will become a bottleneck for the whole system
Below is new architecture by using ADM6996L/LX serial chip VLAN function. The advantages of below are:
•
•
•
•
New Router application works well on normal application. If user’s ISP vendor(cable modem) lock Registration
Card’s ID then Router CPU must send this Lock Registration Card’s ID to WAN Port. One condition happen is
there exist two same MAC ID on this Switch. One is original Card and another one is CPU. This will make Switch
learning table trouble.
ADM6996L/LX provide MAC Clone function that allow two same MAC address with different VLAN ID0 on learning
table. This will solve Lock registration Card’s ID issue. AT8989P serial chip will put these two same MAC
addresses with different VLAN ID0 at different learning table entry.
How to Set ADM6996L/LX on Router.
Port0~3: LAN Port.
Port4: WAN Port.
Port5: MII Port as CPU Port.
Step1: Set Register 11
{Coding: Write Register 11
Step2: Set Port0~3 as Untag Port and set PVID=1.
{Coding: Write Register 01
Step3: Set Port4 as Untag Port and set PVID=2.
{Coding:Write Register 08
Data Sheet
WAN Port can upgrade to 100/10 Full/Half, Auto MDIX.
WAN/LAN Port is programmable and put on same Switch.
No need extra NIC and save lot of cost.
High bandwidth of MII port up to 200M speed.
Bits
15:8
7:6
5
4
3:0
H
bit4 and bit5 to 1.
H
H
H
, 03
as 880F
as FF30
Type
ro
ro
rw
rw
ro
H
, 05
H
H
H
. Port4 as Untag, PVID=2, Enable MDIX.}
, 07
}
Description
Reserved
Reserved
VLAN Mode Select
0
1
MAC Clone Enable
0
1
Reserved
B
B
B
B
H
as 840F
P, Port based by-pass mode
Q, 802.1Q based
N, Normal Mode.Learning with SA only. The MAC table will be
searched or filled using only SA or DA.
M, Mac Mode. Learned using SA VID0. MAC table will be searched
or filled using VID0 SA or DA. This bit allows two identical
addresses with different VID0 to be learned.
H
. Port0~3 as Untag, PVID=1, Enable MDIX}
34
Registers DescriptionEEPROM Content
Rev. 1.13, 2005-11-22
ADM6996L/LX
Data Sheet