adm6999ux Infineon Technologies Corporation, adm6999ux Datasheet - Page 26

• Manufacturer Part Number: adm6999ux
• Description: Adm6999u 9 Port 10/100 Mb/s Single Chip Ethernet Switch Controller
• Manufacturer: Infineon Technologies Corporation

•
Users 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
ADM6999U/UX will check the port user define four bits of VLAN ID first then check VLAN group resister. If the
destination port is in the same VLAN as the receiving port then this packet will forward to the destination port
without any change. If the destination port is not in the same VLAN as the receiving port then this packet will be
dropped.
Example2: Port receives Untag packet and send to Tag port
ADM6999U/UX will check the port user define fours bits of VLAN ID first then check VLAN group resister. If the
destination port is in the same VLAN as the receiving port than this packet will forward to the destination port with
four byte VLAN Tag and new CRC. If the destination port is not in the same VLAN as the receiving port then this
packet will be dropped.
Example3: Port receives Tag packet and send to Untag port
ADM6999U/UX will check the packet VLAN ID first then check VLAN group resister. If the destination port is in the
same VLAN as the receiving port than this packet will forward to the destination port after removing four bytes with
new CRC error. If the destination port is not in the same VLAN as the receiving port then this packet will be
dropped.
Example4: Port receives Tag packet and send to Tag port
ADM6999U/UX will check the user define packet VLAN ID first then check VLAN group resister. If the destination
port is in the same VLAN as the receiving port than this packet will forward to the destination port without any
change. If the destination port is not in the same VLAN as the receiving port then this packet will be dropped.
3.4.5
It is a trend that data, voice and video will be put on networking, Switch not only deals data packet but also provides
service of multimedia data. ADM6999U/UX provides two priority queues on each port with N:1 rate. See EEPROM
Reg. 10
This priority function can set three ways as below:
•
•
•
If the port sets at VLAN/TOS priority but the receiving packet is without VLAN or TOS information then port base
priority will be used.
3.4.6
The ADM6999U/UX provides two different interfaces to drive the status to the LEDs. Each interface supports
visibility per port of port speed, combined transmitting and receiving activity, and duplex collision status. Different
interfaces and it color mode are applied according to LEDMODE pin and the configuration of the ADM6999U/UX
latched during the power on reset.
Data Sheet
VLAN Group Mapping Register. EEPROM register 013
register to define VLAN group.
By Port Base: Set specific port at specific queue. ADM6999U/UX only checks the port priority and does not
check packet’s content VLAN and TOS at bypass mode.
By VLAN first: ADM6999U/UX checks VLAN three priority bit first then IP TOS priority bits. Chip must be set
at Tag mode.
By IP TOS first: ADM6999U/UX checks IP TOS three priority bit first then VLAN three priority bits. Chip must
be set at Tag mode.
H
.
Priority Setting
LED Display
26
H
~022
H
define VLAN grouping value. Users use these
Rev. 1.42, 2005-11-25
ADM6999U/UX
Data Sheet
Descriptions