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FlexRay模块的TXEN引脚在流程中的哪个阶段使能?

Other Parts Discussed in Thread: TMS570LS20216

我所使用的芯片是TMS570LS20216,FlexRay模块的程序下里面跑的时候发现TXEN一直是高电平,想问一下这个引脚在FlexRay流程中的哪个阶段使能,我好回去查一下程序。或者在程序里有没有办法强制TXEN引脚输出低电平呢?