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ADM6995L Datasheet

  • ADM6995L

  • 5 PORT 10/100 MB/s SINGLE CHIP ETHERNET SWITCH CONTROLLER

  • 1633.78KB

  • 57页

  • ETC

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ADM6995L
within 50 ms will be discarded by the threshold setting. See EEPROM Reg.10h.
Broadcast storm mode after initial:
-
time interval : 50ms
the max. packet number = 7490 in 100Base, 749 in 10Base
Per Port Rising Threshold
00
01
10
All 100TX
Disable 10% 20%
Not
All Disable 1% 2%
100TX
Function Description
11
40%
4%
Per Port Falling Threshold
00
01
10
All 100TX
Disable 5% 10%
Not
All Disable 0.5% 1%
100TX
11
20%
2%
3.16 Auto TP MDIX function
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. ADM6995L provide Auto MDIX
function which can adjust TX+- and RX+- at correct pin. User can use one by one cable
between ADM6995L 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
Port locking function will provide customer simple way to limit per port user number to
one. If this function is turn on then ADM6995L 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. ADM6995L 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 VLAN setting & Tag/Untag & port-base VLAN
ADM6995L 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 ADM6995L. Meanwhile port-base VLAN could be
enabled according to the PVID value ( user define 4bits to map 16 groups written at
register 13 to register 22 ) of the configuration content of each port.
ADM6995L also supports 16 802.1Q VLAN groups. In VLAN four bytes tag include
twelve VLAN ID. ADM6995L learn user define four bits of VID. If user need to use this
ADMtek Inc.
3-12

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