adm6999ux Infineon Technologies Corporation, adm6999ux Datasheet - Page 25

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

3.4.1.9
If Broadcast Storming filter is enable, the broadcast packets over the rising threshold within 50 ms will be discarded
by the threshold setting. See EEPROM Reg.10
Broadcast storm mode after initial:
Time interval: 50 ms
The max. packet number = 7490 in 100Base, 749 in 10Base
Table 4
Per Port Rising Threshold
All 100TX
Not All 100TX
Per Port Falling Threshold
All 100TX
Not All 100TX
3.4.2
At normal application which Switch connect to NIC card is by one by one TP cable. If Switch connects other device
such as another Switch must by two way. First one is Cross Over TP cable. Second way is to use extra RJ45 which
crossover internal TX+- and RX+- signal. By second way customers can use one by one cable to connect two
Switch devices. All these efforts need extra cost and are not good solutions. ADM6999U/UX provides Auto MDIX
function which can adjust TX+- and RX+- at correct pin. Users can use one by one cable between ADM6999U/UX
and other device. This function can be Enable/Disable by hardware pin and EEPROM configuration register
01
pin sets all port at non Auto MDIX mode then EEPROM can set each port this function enable or disable.
3.4.3
Port locking function will provide customers a simple way to limit per port user number to one. If this function is
turned on then ADM6999U/UX will lock first MAC address in learning table. After this MAC address locking will
never age out except Reset signal. Another MAC address which is not the same as locking one will be dropped.
ADM6999U/UX provides one MAC address per port. This function is per port setting. When turning on Port Locking
function, recommend customer to turn off aging function. See EEPROM register 12
3.4.4
ADM6999U/UX supports bypass mode and untagged port as default setting while the chip is power-on. Thus,
every packet with or without tag will be forwarding to the destination port without any modification by
ADM6999U/UX. Meanwhile port-base VLAN could be enabled according to the PVID value ( user define 4bits to
map 16 groups written at register 13
ADM6999U/UX also supports 16 802.1Q VLAN groups. In VLAN four bytes tag include twelve VLAN ID.
ADM6999U/UX learns user define four bits of VID. If users need to use this function, two EEPROM registers are
needed to be programmed first:
•
Data Sheet
H
Port VID number at EEPROM register 01
ADM6999U/UX will check coming packet. If coming packet is non VLAN packet then ADM6999U/UX will use
PVID as VLAN group reference. ADM6999U/UX will use packet’s VLAN value when receiving tagged packet.
~09
H
bit 15. If hardware pin set all port at Auto MDIX mode then EEPROM setting is useless. If the hardware
Broadcast Storm Filter
Port Rising/Falling Threshold
Auto TP MDIX Function
Port Locking
VLAN Setting & Tag/Untag & Port-base VLAN
00
Disable
Disable
00
Disable
Disable
H
to register 22
H
01
10%
1%
01
5%
0.5%
~09
H
.
H
H
bit 13~10, register 28
) of the configuration content of each port.
25
10
20%
2%
10
10%
1%
H
~2B
H
and register 2C
H
bit 0~8.
Rev. 1.42, 2005-11-25
11
40%
4%
11
20%
2%
ADM6999U/UX
H
bit 7~0:
Data Sheet
Descriptions