ADM6926 查看數據表（PDF） - Unspecified

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ADM6926

26 port 10/100 Mbps Ethernet Switch Controller

Unspecified 

ADM6926

Function Description

SA+VID was found in the address table, then aging value of each corresponding entry

will be reset to 0.

Dynamic learning will be disabled in the following condition:

(1) Security violation happened.

(2) The packet is a PAUSE frame.

(3) The first bit of SA is 1’b1.

(4) The packet is an error packet (too long, too short or FCS error).

(5) The CPU port leaning function is disabled or enabled but the CPU port instructs

the switch not to learn the packet.

(6) The port is in the Disabled or Blocking-not-Listening state in the Spanning Tree

Protocol.

2. Manual Learning

The ADM6926 implements the manual learning through the CPU’s help. The CPU can

create or remove any entry in the address table. Each entry could be static or pointed to

the output port map table. “Static” means the entry will not be aged forever. It is useful in

the security function (forward unknown packets to the CPU port or discard) or monitor

function (forward monitored address to the specific port). Output port map table is also

helpful in the IGMP function (if the number of the output port is more than one) or the

users want to redirect the special packets with reserved DA.

3.1.3 Address Aging

The ADM6926 will periodically (300ms) remove the non-static address in the address

table. This could help to prevent a station leaves the network and occupies a table space

for a long time. Aging function can be disabled from the hardware pin.

ADMtek Inc.

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