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中间是否需要加交换芯片？
两片C6678分别需要作什么配置呢？
不需要交换芯片，可以直连，具体硬件设计参考EVM原理图及keystone hardware design user guide。
http://www.ti.com/product/TMS320C6678/technicaldocuments
谢谢！
