参数资料
型号: ZL50418GKG2
厂商: CONEXANT SYSTEMS
元件分类: 网络接口
英文描述: DATACOM, LAN SWITCHING CIRCUIT, PBGA553
封装: 37.50 X 37.50 MM, 2.33 MM HEIGHT, LEAD FREE, MS-034, HSBGA-553
文件页数: 120/155页
文件大小: 1928K
代理商: ZL50418GKG2
ZL50418
Data Sheet
67
Zarlink Semiconductor Inc.
Two functions are required in order to distribute multicast packets to the appropriate destination ports in a port
trunking environment.
Determining one forwarding port per group. For multicast packets, all but one port per group, the forwarding
port must be excluded.
Preventing the multicast packet from looping back to the source trunk.
The search engine needs to prevent a multicast packet from sending to a port that is in the same trunk group with
the source port. This is because when we select the primary forwarding port for each group, we do not take the
source port into account. To prevent this, we simply apply one additional filter so as to block that forwarding port for
this multicast packet.
9.4
Unmanaged Trunking
In unmanaged mode, 3 trunk groups are supported. Groups 0 and 1 can trunk up to 4 10/100 M ports. Group 2 can
trunk 2 Gigabit ports. The supported combinations are shown in the following table.
Select via trunk0_mode register
Select via trunk1_mode register
In unmanaged mode, the trunks are individually enabled/disabled by controlling pin TRUNK0,1,2.
10.0
Port Mirroring
10.1
Port Mirroring Features
The received or transmitted data of any 10/100 M port in the ZL50418 chip can be “mirrored” to any other port. We
support two such mirrored source-destination pairs. A mirror port can not also serve as a data port.
Please refer to the Port Mirroring Application Note, MSAN-210, for further details.
10.2
Setting Registers for Port Mirroring
MIRROR1_SRC: Sets the source port for the first port mirroring pair. Bits [4:0] select the source port to be mirrored.
An illegal port number is used to disable mirroring (which is the default setting). Bit [5] is used to select between
ingress (Rx) or egress (Tx) data.
Group 0
Port 0
Port 1
Port 2
Port 3
Group 1
Port 4
Port 5
Port 6
Port 7
Group 2
Port 25 (Gigabit 0)
Port 26 (Gigabit 1)
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