cx3 mipi unused data line

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cx3develop
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Hello,

 

I am testing the CX3 mipi interface that uses only 2 data lanes.

My board was created with unsed data lane floating. 

I just found out that the data sheet says to connect to the ground, but i cannot modify it now...

 

What are the results in this case? What are the expected problems?

Is it unstable? Or Is it not working?

Please,, we are praying it is working...

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JayakrishnaT_76
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First question asked 1000 replies posted 750 replies posted

Hello,

As mentioned in the following KBA:

https://community.infineon.com/t5/Knowledge-Base-Articles/CX3-Hardware-Frequently-Asked-Questions-KB...
We strongly recommend to ground the unused MIPI data lanes. You might see MIPI errors or problems in streaming if this is followed correctly.

Best Regards,
Jayakrishna

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JayakrishnaT_76
Moderator
Moderator
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First question asked 1000 replies posted 750 replies posted

Hello,

As mentioned in the following KBA:

https://community.infineon.com/t5/Knowledge-Base-Articles/CX3-Hardware-Frequently-Asked-Questions-KB...
We strongly recommend to ground the unused MIPI data lanes. You might see MIPI errors or problems in streaming if this is followed correctly.

Best Regards,
Jayakrishna
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Hello, Jayakrishna


Thanks for the reply.
We need time to modify the hardware,, so before modifying, we are testing now with floating unused 2lines.

I started the test with MIPI error and GPIF state in the log once a second.
The GPIF State was always in 2 after the camera started.
MIPI error changed to ctlErrCnt (Control Error (Incorrect Line State Sequence)) Count to 1 only once after startup. (All other errors were 0) After that, all errors, including ctlErrCnt, were 0. (clrErrCnts is false)

Is it the cause of this situation that floating two unused lines?

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Hello,

Were you able to stream the video successfully?

You may or may not see more errors as you start streaming. So, it is always recommended to follow the guidelines as much as possible.

Best Regards,
Jayakrishna
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Hello, Jayakrishna

No, ,,  no images are streamed.
Error and status logs were also added by me to the "CyCx3UvcAppThread_Entry" thread.

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Hello,

We strongly recommend to ground the unused MIPI lines to avoid any possible failures in your product. Please follow all the hardware guidelines when you design a new product. You can refer to the following Application Note:
https://www.infineon.com/dgdl/Infineon-AN70707_EZ-USB_FX3_FX3S_SX3_hardware_design_guidelines_and_sc...

Along with the following KBA:

https://community.infineon.com/t5/Knowledge-Base-Articles/CX3-Hardware-Frequently-Asked-Questions-KB...

While you design the new board. 

Not following the hardware guidelines properly could result in transfer failures.

Best Regards,
Jayakrishna
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