你看Cotex-M3内核的时候看看系统的框架,内部是采用总线矩阵(轮转调度),矩阵上连接着几个master与slaver.每条总线的用途都有说明。
S0:This bus connects the Instruction bus of the Cortex®-M3 core to the BusMatrix. This bus is used by the core to fetch instructions.
S1:This bus connects the databus of the Cortex®-M3 to the BusMatrix. This bus is used by the core for literal load and debug access.
S2:This bus connects the system bus of the Cortex®-M3 core to a BusMatrix. This bus is used to access data located in a peripheral or in SRAM.