參數(shù)資料
型號: POE-VOICE-RD
廠商: Silicon Laboratories Inc
文件頁數(shù): 8/108頁
文件大?。?/td> 0K
描述: KIT REF DESIGN PWR OVER ETHERNET
標準包裝: 1
主要目的: 參考設計,以太網(wǎng)供電(POE),語音傳輸
嵌入式: 是,MCU,8 位
已用 IC / 零件: C8051F340,CP2201,Si3400
主要屬性: 嵌入式以太網(wǎng),以太網(wǎng)供電,8 kHz 語音采樣系統(tǒng)
次要屬性: 圖形用戶界面
已供物品: 板,線纜,電源,軟件
產(chǎn)品目錄頁面: 626 (CN2011-ZH PDF)
相關產(chǎn)品: 336-1385-ND - IC POWER OVER ETHERNET 20QFN
336-1322-ND - IC POWER OVER ETHERNET 20QFN
336-1313-ND - IC ETH CTRLR SNGL-CHIP 28QFN
336-1298-ND - IC 8051 MCU FLASH 64K 48TQFP
其它名稱: 336-1326
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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