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TPS65988: AMEx 命令发送Fail问题

Part Number: TPS65988

你好,我在TPS65988的端口处于DFP状态,且已经进入DP Alt Mode时,通过MCU发送“AMEx”命名给TPS65988,但是65988拒绝执行AMEx,请问有什么可能原因导致65988拒绝接收该命名?

备注:MCU发送其他命令如“SSrC”等,65988是可以正常执行的。