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求助TMS320C6455的EMIF通信ASRE脚反了相始终是高有效,空闲时一直为低电平有图有真相!!

Other Parts Discussed in Thread: TMS320C6455

TMS320C6455的EMIF通信ASRE脚始终是高有效,空闲时一直为低电平,试了所有寄存器配置以及同步读写、异步读写ASRE都是高有效,空闲时一直处于低电平,而其他控制脚空闲时都是高电平,有效时是低电平;有图为证:

官方手册:

为什么??求助