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am3517的GPMC数据总线keep问题

Other Parts Discussed in Thread: AM3517

我的板子是am3517,设置gpmc功能,异步16位数据线,设置wrofftime=1f(31个fclk周期),cstime=1f,片选周期和写周期都是31个fclk周期,且波形都很正常,我是单步通信,每隔一秒钟写一个数据,示波器显示数据的保持时间只有片选的一半,根据datasheet上看异步不复用写模式数据应该保持到写周期结束,如图所示,黄线是片选信号,蓝线是数据表示1,但是后来又降低为0了,请ti的工程师帮忙分析一下,最近被这个事情搞的吃不好睡不好的。