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am335x gpmc nor flash 时序问题



gpmc 和 nor flash     异步 16位  地址复用方式

Asynchronous Single-Read Operation on an Address/Data Multiplexed Device

目前无法读取设备ID  且  配置的cs,adv, oe等控制信号的时序,  和 测量出的时序不符。

如配置GPMC_CONFIG2 

CSONTIME = 2, CSRDOFFTIME=12  即cs 有效时间为10个时钟周期, 但通过示波器测试为7个时钟周期,其他的控制信号类同

请问ti工程师这是怎么回事??