参数资料
型号: CP2200-GQR
厂商: SILICON LABORATORIES
元件分类: 微控制器/微处理器
中文描述: 1 CHANNEL(S), LOCAL AREA NETWORK CONTROLLER, PQFP48
封装: 9 X 9 MM, LEAD FREE, TQFP-48
文件页数: 8/108页
文件大小: 1432K
代理商: CP2200-GQR
CP2200/1
Rev. 1.0
105
17.2. MAC Address Filtering
Problem
For unicast packets received over the Ethernet wire, the receive filter only validates the first 5 bytes of the 6-byte
Ethernet MAC Address. Any packet addressed to a device whose MAC address only differs in the 6th byte will be
allowed to pass through the receive filter.
Workaround
The Ethernet driver on the host controller should verify that the 6th byte of each packet (i.e., the final byte of the
MAC address) matches its assigned MAC address. If it detects a mismatch, the packet should be discarded by
writing 1 to the RXSKIP bit.
Implications on Throughput
This behavior does not slow down the rate which the embedded system can send or receive packets, since the
CP220x must receive and filter all packets on the network. However, it can interrupt the host controller for received
packets addressed to another device with a similar MAC address (where the only difference is in the 6th byte) on
the same subnet. On a managed switch network, present on most corporate LANs, the effect of this behavior is
minimal due to the fact that the managed switch filters out unicast packets not addressed to the receiving Ethernet
device.
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