芯片设计问题

Autonomous Machines Jetson & Embedded Systems Jetson Xavier NX
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1

目前我们发现mipi信号输入xavier NX 核心板子，信号幅度太低，另外上升沿和下降沿轻微缓慢；

想咨询下，贵司xavier NX的mipi MIPI CSI lanes的接收门限；

评估下mipi CSI的风险；

附件是测试靠近SODIMM260座子附近的测试点的眼图报告；

主要NG项目如下：

1， 测试项目，目前主要fail项是：

彩色相机 camera4，对应xavier NX的CSI4组， 主要fail项目

1.3.11 HS Data TX 20%-80% Rise Time (tR)[Burst Data]， 测试结果500ps， 范围要求：小于375ps

1.3.12 HS Data TX 80%-20% Fall Time (tF)[Burst Data]， 测试结果559ps， 范围要求：小于375ps

1.4.4 HS Clock TX Differential Voltage(VOD0 Pulse)，， 测试结果106mv， 范围要求：140.00 mV <= VALUE <= 270.00mV

黑白相机测试了camera1的，对应xavier NX的CIS0组输入；

主要fail为：

1.3.11 HS Data TX 20%-80% Rise Time (tR)[Burst Data]， HS数据的上升沿=350ps，范围是要求小于375ps；

1.3.12 HS Data TX 80%-20% Fall Time (tF)[Burst Data]，测试结果为：391ps，范围要求小于375ps；

1.5.4 Data-to-Clock Skew (TSKEW(TX))(Max,Min)，抖动测试，，测试结果 172mUIinst ，范围是150；

2

Hello,

Welcome to the NVIDIA Developer forums. Your issue should be posted in the Jetson Xavier NX category, I will move it over to the correct forum for you.

Tom K

4

hello 1753828207,

driver attempts to auto-calibrate by default, there’s cil_settletime to configure it manually , THS settle time of the MIPI lane, unit in nanoseconds.
please check TRM for the details, please search CLK_SETTLE and THS_SETTLE for reference,
you may also check MIPI Alliance Specification for D-PHY for details.
thanks

1 Like
5

hi

6

Hi JerryChang
感谢您的回复；我们仔细看了下， cil_settletime 好像是建立时间的调整？？请帮忙确认下细节怎么调整？

其实我们想咨询的是mipi RX的接收电平门限；我们MIPI TX在源端测试是PASS的,，但是经过长距离PCB传输后，靠近NX核心板子座子260P座子附件，信号衰减到了130mv 左右；

7

hello user9267,

please share the use-case about the distance,
there’s camera use-case with SerDes chips which support long distance, please see-also developer guide, GMSL Protocol.
thanks

8

The CSI port on Jetson is standard port following MIPI spec. Please follow MIPI spec for threshold.

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