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DS90UB940-Q1: Smoe of 940s do noy output Test Pattern on MIPI

Part Number: DS90UB940-Q1

Hi team,

Please help me to resolve a problem.

When I test pattern generator in DS90UB940, some of devices do not output
MIPI packets.

Some device intermittently outputs MIPI data, some does not output data at all.
Least of devices output valid MIPI packet.

I used internal clock.
So, there are on contributors out of the devices.
Can you advise me what items in DS90UB940 possibly case this kind of trouble?

Mita