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什么情况下EMIFA接口需要用SELECT STROBE模式



1、6747EMIFA接口提供了NORMAL和SELECT STROBE 两种模式,我知道二者不同之处在于CS#沿变时间不同,但是SELECT STROBE 是针对与哪种情况下使用的?

2、两种模式都支持外部器件通过EMA_WAIT引脚改变STROBE长度,哪种类型器件会用到EMA_WAIT引脚?