adm6999g Infineon Technologies Corporation, adm6999g Datasheet - Page 26

• Manufacturer Part Number: adm6999g
• Description: 8 Port 10/100 Mb/s + Gigabit Single Chip Ethernet Switch Controller
• Manufacturer: Infineon Technologies Corporation

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Users can define each port as Tagged port or Untagged port by Configuration register Bit 4. The operation of
packets between Tagged port and Untagged port can be explained by following example:
Example1: Port receives Untagged packet and send to Untagged port
ADM6999G/GX will check the port user define four bits of VLAN ID first then check VLAN group register. 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 Untagged packet and send to Tagged port
ADM6999G/GX will check the port user define fours bits of VLAN ID first then check VLAN group register. If the
destination port is the same VLAN as the receiving port than this packet will forward to destination port with four
byte VLAN Tag and new CRC. If the destination port is not the same VLAN as receiving port then this packet will
be dropped.
Example3: Port receives Tag packet and send to Untag port
ADM6999G/GX will check the packet VLAN ID first then check VLAN group register. If the destination port is the
same VLAN as receiving port than this packet will forward to destination port after removing four bytes with new
CRC error. If the destination port is not the same VLAN as receiving port then this packet will be dropped.
Example4: Port receives Tag packet and send to Tag port
ADM6999G/GX will check the user define packet VLAN ID first then check VLAN group register. If the destination
port is the same VLAN as receiving port than this packet will forward to destination port without any change. If the
destination port is not the same VLAN as 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 packets but also
provides services of multimedia data. ADM6999G/GX provides two priority queues on each port with N:1 rate. See
EEPROM Reg. 10
This priority function can be set by three ways as below:
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If the port sets as VLAN/TOS priority but the receiving packet is without VLAN or TOS information then port base
priority will be used.
3.4.6
The ADM6999G/GX provides two different interfaces to drive the status to the LEDs. Each interface supports
visibility of each port’s speed, combines transmitting and receiving activity, and duplex collision status. Different
interfaces and its color mode are applied according to LEDMODE pin and the configuration of the ADM6999G/GX
latched during the power on reset.
Data Sheet
Port VID number at EEPROM register 01
ADM6999G/GX will check coming packet. If coming packet is non VLAN packet then ADM6999G/GX will use
PVID as VLAN group reference. ADM6999G/GX will use packet’s VLAN value when receive tagged packet.
VLAN Group Mapping Register. EEPROM register 013
register to define VLAN group.
By Port Base: Set specific port at specific queue. ADM6999G/GX only checks the port priority and does not
check packet’s content VLAN and TOS at bypass mode.
By VLAN first: ADM6999G/GX checks VLAN three priority bit first then IP TOS priority bits. The chip must be
set as Tagged mode.
By IP TOS first: ADM6999G/GX checks IP TOS three priority bit first then VLAN three priority bits. Chip must
be set as Tagged mode.
Priority Setting
LED Display
H
.
H
~09
H
bit 13~10, register 28
26
H
~022
H
defines VLAN grouping value. Users use these
H
~2B
H
and register 2C
Rev 1.31, 2005-11-25
ADM6999G/GX
H
bit 7~0:
Descriptions