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TXB0104 外接长0.5m线 spi信号畸变厉害通讯异常【在线等】

Other Parts Discussed in Thread: TXB0104

整个系统由2部分组成,主板和板外延长线(延长线用于连接从板)

主板上TXB0104到mcu 走线距离10cm,板外延长线不同长度做了几组实验如下:

当板外延长线50cm:测量B2、B3、B4引脚上和A端,spi的信号都畸变了。

延长线0cm:测量B端和A端,spi信号正常。

延长线10cm:测量B端和A端,spi信号也正常。

请教下畸变原因是?