adm6999g Infineon Technologies Corporation, adm6999g Datasheet - Page 25

• Manufacturer Part Number: adm6999g
• Description: 8 Port 10/100 Mb/s + Gigabit 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 connects to NIC card is by one by one TP cable. If Switch connects to other
devices such as another Switch must be by two way. The first one is Cross Over TP cable. The 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 costs and are not good solutions. ADM6999G/GX
provides Auto MDIX function which can adjust TX+- and RX+- at correct pin. Users can use one by one cable
between ADM6999G/GX and other devices. This function can be Enable/Disable by hardware pin and EEPROM
configuration register 01
useless. If the hardware pin sets all ports at non Auto MDIX mode then EEPROM can set each port’s Auto MDIX
function to be enabled or disabled.
3.4.3
Port locking function will provide customers a simple way to limit per port’s user to one. If this function is turned on
then ADM6999G/GX 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 the locking one will be dropped.
ADM6999G/GX provides one MAC address per port. This function is per-port-setting. When turning on Port
Locking function, we recommend customers to turn off aging function. See EEPROM register 12
3.4.4
ADM6999G/GX 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
ADM6999G/GX. Meanwhile port-base VLAN could be enabled according to the PVID value (user define 4bits to
map 16 groups written at register 13
ADM6999G/GX also supports 16 802.1Q VLAN groups. In VLAN four bytes tag include twelve VLAN ID.
ADM6999G/GX learns user defined four bits of VID. If users need to use this function, two EEPROM registers are
needed to be programmed first:
Data Sheet
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
~09
H
bit 15. If hardware pin sets all ports at Auto MDIX mode then EEPROM setting is
H
to register 22
01
10%
1%
01
5%
0.5%
H
.
H
) of the configuration content of each port.
25
10
20%
2%
10
10%
1%
Rev 1.31, 2005-11-25
11
40%
4%
11
20%
2%
ADM6999G/GX
H
bit 0~8.
Descriptions