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DS90UB949-Q1: DS90UB949与DS90UB988搭对,无法链接到988

Part Number: DS90UB949-Q1
1.DS90UB981(主控制器#1)与DS90UB988(显示总成#1)搭对使用,FPD LINK Ⅳ,Single Link,PORT0 to PORT0,988 RX mode:FPD4 Auto-detect(通过MODE SEL0外部电阻配置),显示和通信控制均正常
2.DS90UB949(主控制器#2)与DS90UB988(显示总成#1)搭对使用,FPD LINK III,Single Link,PORT0 to PORT0,988 RX mode:FPD3 Auto-detect(通过MODE SEL0外部电阻配置),接上LVDS线束,上电读取949的0X0C寄存器第0位一直为0(Cable link not detected),检查PORT0的+/-通道均无短路和开路异常,949的0X1E寄存器默认值为0X01,如上述描述,帮忙看一下可能性原因有哪些?或者949搭配988使用,还有其他寄存器需要单独配置吗
另关于988和981芯片,我司与TI原厂已经签过NDA文件,谢谢