ADM6996L-AA-T-1 Lantiq, ADM6996L-AA-T-1 Datasheet - Page 23

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

Specifications of ADM6996L-AA-T-1

• Lead Free Status / RoHS Status: Supplier Unconfirmed

implemented inside the ADM6996L/LX to prevent the back pressure function causing HUB partitioned under
heavy traffic environment and reducing the packet loss rate to increase the whole system performance.
3.15.8
When full duplex port run out of its receive buffer, a PAUSE packet command will be issued by ADM6996L/LX to
notice the packet sender to pause transmission. This frame based flow control is totally compliant to IEEE 802.3x.
ADM6996L/LX can issue or receive pause packet.
3.15.9
If the Broadcast Storm filter is enabled, the broadcast packets over 50 ms of the threshold will be discarded by the
threshold setting. See EEPROM Reg.10h.
Broadcast storm mode:
Time interval: 50ms
Max. packet number = 7490 in 100Base, 749 in 10Base
Table 7
Per Port Falling Threshold
All 100TX
Not All 100TX
Table 8
Per Port Rising Threshold
All 100TX
Not All 100TX
3.16
At normal application which Switch connect to NIC card is by one by one TP cable. If Switch connect other device
such as another Switch must by two way. First one is Cross Over TP cable. Second way is use extra RJ45 which
crossover internal TX+- and RX+- signal. By second way customer can use one by one cable to connect two
Switch devices. All these effort need extra cost and not good solution. ADM6996L/LX provide Auto MDIX function
which can adjust TX+- and RX+- at correct pin. User can use one by one cable between ADM6996L/LX and other
device. This function can be Enable/Disable by hardware pin and EEPROM configuration register 0x01h~0x09h
bit 15. If hardware pin set all port at Auto MDIX mode then EEPROM setting is useless. If hardware pin set all port
at non Auto MDIX mode then EEPROM can set each port this function enable or disable.
3.17
Port locking function will provide customer simple way to limit per port user number to one. If this function is turn
on then ADM6996L/LX will lock first MAC address in learning table. After this MAC address locking will never age
out except Reset signal. Another MAC address which not same as locking one will be dropped. ADM6996L/LX
provide one MAC address per port. This function is per port setting. When turn on Port Locking function,
recommend customer turn off aging function. See EEPROM register 0x12h bit 0~8.
3.18
ADM6996L/LX 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 ADM6996L/LX.
Data Sheet
Full Duplex Flow Control
Broadcast Storm filter
The max. packet number = 7490 in 100Base, 749 in 10Base
The max. packet number = 7490 in 100Base, 749 in 10Base
Auto TP MDIX function
Port Locking
VLAN setting & Tag/Untag & port-base VLAN
00
Disable
Disable
00
Disable
Disable
B
B
01
5%
0.5%
01
10%
1%
B
B
23
10
10%
1%
10
20%
2%
B
B
Function Description
Rev. 1.13, 2005-11-22
11
20%
2%
11
40%
4%
B
B
ADM6996L/LX
Data Sheet