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TMS320F28388D: 关于TMS320F28388D controlCARD J4(Ethernet connector – RJ45 connector) / J5(EtherCAT P0 – RJ45 connector) 和 J6(EtherCAT P1 – RJ45 connector)的问题请教

Part Number: TMS320F28388D

我是新手,我在学习controlCARD的文档的时候,发现文档中,有一个J5的RJ45接口和J6的RJ45接口,它们看上去完全是一样的,为什么要弄2个啊?

另外就是这个J4接口是用来做什么的啊?

谢谢你们的帮助。