Hello,
One customer met one question during using DS90UB927+DS90UB940. The application is HOST(LVDS/I2C)--927--940--(CSI/I2C) display.
Now one strange phenomenon is that once 927 connected 940, then 927 is always send 0xD7 and didn't stop to send 0XD7. Even disconnected the Host and Display, he tested the 927 still send 0XD7. Below is the captured data with Logic Analyzer.
So the questions are as these:
1. He cleared the CRC error by 0X4 bit5, and found that if connected 940, 924 still send 0xD7 data.
2. Why 927 would send 0xD7 or 0XD4 data ? He debugged that if he set Back Channel CRC Generator Enable(0x3=0XB0) of DS90UB940, 927 would stop send 0xD7 or send once every 128ms, or send again after 10s. That is not completely resolved, what is the reason about this?
3. If there is any way or registers to disable 927 to send data when 927 connected 940?
Best regards
Kailyn