It has an integrated memory management unit that is normally used to provide access to the address space of one process by using the same page table lookup as the PPE.
它具有一个集成的内存管理单元，通常使用与PPE类似的页表查询机制来提供对某个进程地址空间的访问。
In general, the unit address is the primary address used to access the device, and is listed in the node's reg property.
通常，设备地址就是用来访问该设备的主地址，并且该地址也在节点的reg属性中列出。
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