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DS90UB954-Q1: mipi测试fail

Part Number: DS90UB954-Q1


954将图像数据通过mipi接口送给cpu,cpu模组对于我们是黑盒,只能在载板中间链路测试MIPI信号质量(如下图所示),实测后发现部分项始终fail,也无法仿真确认是因为测不到末端导致的还是板子硬件上存在问题

有没有其他方式验证这段链路可靠性,另外在954手册里没有看到可以调节mipi参数的寄存器。

  • 您好,

    为更加有效地解决您的问题,我已将问题发布在E2E英文技术论坛上,将由资深的英文论坛工程师为您提供帮助,您可以关注帖子以及时查看英文工程师的回复:

    https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1287185/ds90ub954-q1-mipi-test-fail

  • 收到的回复大意是建议按照布局指南中设计CSI-2走线,不建议在CSI-2走线中添加测试点,因为它们会影响迹线阻抗。 如果需要在CSI-2走线上添加测试点,需要确保不会导致阻抗不连续性。 您是否验证了设计中的阻抗以及CSI-2布局是最佳方案?

    Our devices have been validated to comply with MIPI D-PHY specs, and we provide layout guidelines to help the customer design meet the D-PHY specification. We typically do not recommend adding test points to the CSI-2 traces since they can affect the trace impedance. If they decide to add test points on the CSI-2 traces, they must make sure that it does not cause an impedance discontinuity. Have they verified the impedance in their design along with the other CSI-2 layout best practices?