本文介绍了多主总线系统的基本概念及其应用。在多主总线架构中，多个节点可以作为主控设备进行数据传输，例如直接内存访问（DMA）可以不依赖中央处理器（CPU）实现外围设备与内存之间的数据交换。某些总线如 I²C 自然地支持多主模式，允许任意节点发起与其他节点的数据交互。
http://en.wikipedia.org/wiki/Multi-master_bus
From Wikipedia, the free encyclopedia<!-- start content -->
A multi-master bus is a computer bus in which there are multiple bus master nodes present on the bus. This is used when multiple nodes on the bus must/need to initiate transfer. For example, direct memory access (DMA) is used to transfer data between peripherals and memory without the need to use the central processing unit (CPU).
Some buses like I²C use multi-mastering inherently to allow any node to initiate a transfer with another node.
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