DMA controller and coherency-tracking unit for efficient data transfers between coherent and non-coherent memory spaces

摘要

In a computer system, an agent, a DMA controller and a memory controller are provided, each in communication with a bus. The DMA controller and the memory controller also can communicate with each other via a second communication path. The computer system may include a memory provided in communication with the memory controller having a coherent memory space and a non-coherent memory space. The DMA controller transfers a portion of data from the coherent memory space with a portion of data from the non-coherent memory space with a single transaction on the external bus.