一个4路交换机芯片资料.很不错的TheRTL8201BLisasingle-portPhyceiverwithanMII(MediaIndependentInterface)/SNI(SerialNetworkInterface).Itimplementsall10/100MEthernetPhysical-layerfunctionsincludingthePhysicalCodingSublayer(PCS),PhysicalMediumAttachment(PMA),TwistedPairPhysicalMediumDependentSublayer(TP-PMD),10Base