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AM4378的gpmc时序问题

Other Parts Discussed in Thread: AM4378

1)AM4378芯片,dts配置如下:

使用fpga抓输出信号如下图

cs信号,并不是一直为低,是配置什么地方出问题了么?

2)另外,我现在尝试把读写周期配置到10ns,结果从fpga无法抓取到数据,GPMC只能以20ns为周期传数据么,或者DTS应该如何配置,使其支持更快的频率。