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MCU-PLUS-SDK-AM243X: profinet switch

Part Number: MCU-PLUS-SDK-AM243X
Other Parts Discussed in Thread: LP-AM243

Hi,

I got  an am243x-lp board, i want to use for profinet product development. But there is a problem about Communication between the net ports: I can only  connect one net to siemens tia v15,the another net port can not be used! why?