ADM6996L-AA-T-1 Lantiq, ADM6996L-AA-T-1 Datasheet - Page 24

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

Specifications of ADM6996L-AA-T-1

• Lead Free Status / RoHS Status: Supplier Unconfirmed

Meanwhile port-base VLAN could be enabled according to the PVID value (user define 4bits to map 16 groups
written at register 13 to register 22) of the configuration content of each port.
ADM6996L/LX also supports 16 802.1Q VLAN groups. In VLAN four bytes tag include twelve VLAN ID.
ADM6996L/LX learn user define four bits of VID. If user need to use this function, two EEPROM registers are
needed to be programmed first:
* Port VID number at EEPROM register 0x01h~0x09h bit 13~10, register 28
ADM6996L/LX will check coming packet. If coming packet is non VLAN packet then ADM6996L/LX will use PVID
as VLAN group reference. ADM6996L/LX will use packet’s VLAN value when receive tagged packet.
* VLAN Group Mapping Register. EEPROM register 013
register to define VLAN group.
User can define each port as Tag port or Untag port by Configuration register Bit 4. The operation of packet
between Tag port and Untag port can explain by follow example:
Example1: Port receives Untag packet and send to Untag port.
ADM6996L/LX will check the port user define four bits of VLAN ID first then check VLAN group resister. If
destination port same VLAN as receiving port then this packet will forward to destination port without any change.
If destination port not same VLAN as receiving port then this packet will be dropped.
Example2: Port receives Untag packet and send to Tag port.
ADM6996L/LX will check the port user define fours bits of VLAN ID first then check VLAN group resister. If
destination port same VLAN as receiving port than this packet will forward to destination port with four byte VLAN
Tag and new CRC. If destination port not same VLAN as receiving port then this packet will be dropped.
Example3: Port receives Tag packet and send to Untag port.
ADM6996L/LX will check the packet VLAN ID first then check VLAN group resister. If destination port same VLAN
as receiving port than this packet will forward to destination port after remove four bytes with new CRC error. If
destination port not same VLAN as receiving port then this packet will be dropped.
Example4: Port receives Tag packet and send to Tag port.
ADM6996L/LX will check the user define packet VLAN ID first then check VLAN group resister. If destination port
same VLAN as receiving port than this packet will forward to destination port without any change. If destination
port not same VLAN as receiving port then this packet will be dropped.
3.19
It is a trend that data, voice and video will be put on networking, Switch not only deal data packet but also provide
service of multimedia data. ADM6996L/LX provides two priority queues on each port with N:1 rate. See EEPROM
Reg.10
This priority function can set three ways as below:
* By Port Base: Set specific port at specific queue. ADM6996L/LX only check the port priority and not check
packet’s content VLAN and TOS.
* By VLAN first: ADM6996L/LX check VLAN three priority bit first then IP TOS priority bits.
* By IP TOS first: ADM6996L/LX check IP TOS three priority bit first then VLAN three priority bits.
If port set at VLAN/TOS priority but receiving packet without VLAN or TOS information then port base priority will
be used.
3.20
Three LED per port are provided by ADM6996L/LX. Link/Act, Duplex/Col. & Speed are three LED display of
ADM6996L/LX. Dual color LED mode also supported by ADM6996L/LX. For easy production purpose
ADM6996L/LX will send test signal to each LED at power on reset stage. EEPROM register 12
configuration table.
ADM6996L/LX LED is active Low signal. Dupcol0 & Dupcol1 will check external signal at Reset time. If external
signal add pull high then LED will active Low. If external signal add pull down resister then LED will drive high.
Data Sheet
H
.
Priority Setting
LED Display
24
H
~022
H
define VLAN grouping value. User use these
H
~2B
H
and register 0x2ch bit 7~0:
Function Description
Rev. 1.13, 2005-11-22
ADM6996L/LX
Data Sheet
H
define LED