TDA4VM: Vision_apps: AR0820 27 FPS limitation

The limitation comes from UB953.

Hi Mayank:

Thanks your information,

I go to check UB953's datasheet, 

Follow one 8MP RAM12 frame size is 14307840 bytes (3840 * 2160 * 12bits *1.15 overhead )

In UB953 4.16Gpbs setting, it should can support to 38 FPS ( 4.16Gpbs = 545259520 Byte/s, and 545259520 / 14307840 = 38.1 )

In UB953 832Mbps on 4 data lanes, it;s limitation is 30 FPS ( 832Mbps * 4 = 436207616 Byte/s, and  436207616  / 14307840 = 30.4 )

So the real limitation  is UB953's CSI-2 data line, right?

BR

Sentinen Chen

Sentinen.Chen said:

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Sensor also has pixel clock restrictions and blanking requirements. We have used the recommended sequence provided by OnSemi for their MARS reference design. You may want to reach out to OnSemi to check if they have a 38fps setting for AR0820+UB953 MARS.

Hi Mayank:

Do you know how many the correct fps is that the AR0820 recommended sequence provided by OnSemi for their MARS reference design? 

BR

Sentinen Chen 

Hi Mayank:

Thanks your information. 

We will try to contact the OnSemi to see is there any update of  pixel clock restrictions and blanking requirements that we can imporve sensor fps.

BR

Sentinen Chen