参数资料
型号: CP2201-GM
厂商: Silicon Laboratories Inc
文件页数: 8/108页
文件大小: 0K
描述: IC ETH CTRLR SNGL-CHIP 28QFN
标准包装: 73
控制器类型: 以太网控制器,MAC/10Base-T
接口: 并行/串行
电源电压: 3.1 V ~ 3.6 V
电流 - 电源: 75mA
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 28-VFQFN 裸露焊盘
供应商设备封装: 28-QFN(5x5)
包装: 管件
产品目录页面: 627 (CN2011-ZH PDF)
配用: 336-1326-ND - KIT REF DESIGN PWR OVER ETHERNET
336-1316-ND - KIT EVAL FOR CP2201 ETH CTRLR
其它名称: 336-1313
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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