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arm3517 gpmc的nwe信号无法拉低



两个片选cs4和cs5,5是用来写的,我写一个16位的数据出去,片选信号正常,nwe信号连接的是一个锁存器,现在我要求nwe信号在片选信号前结束,但是,发现nwe信号很不正常,当设置寄存器config4nwe信号起始为0和结束为0时,nwe信号和片选相同,设置其他值时,都是两个尖峰,无法拉低信号,这是怎么回事,求指教,片选信号cs正常,我调用的gpmc.c里面的读写寄存器的函数。