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关于28377D上的MSGRAM数据走向问题

关于28377D上的MSGRAM数据走向问题。

1、如下图中所示,CPU2 TO CPU1 MSGRAM 模块指向CPU1 TO CPU2 MSGRAM有一个指向箭头,但反过来却没有,这个不理解了????

2、CPU1 TO CPU2 MSGRAM模块与CPU1.DMA和CPU2.DMA两个模块之间的箭头怎么理解.