说明：  AHB接口的ram控制器，可靠性非常强。除了两个周期内发生读到写或写到读的极限情况（一般处理器设计中不会有这种传输方式），其他传输方式完全没有问题
(AHB interface ram controller, reliability is very strong. In addition to occurring in two cycles read or write read write the limit (usually processor design will not have such means of transmission), other means of transmission is no problem)