TDA4VM: Some questions about TDA4 ISP chip

Hi 

Did not get the first question. 

I think it would support 4 camera of 8MP resolution at 15fps. 

wang zhili said:

And whether this input bandwidth is shared by multiple cameras or single cameras?

Did not get this question, ISP is shared among all cameras..

Regards,

Brijesh

Hi,

wang zhili said:

"What is the resource usage of TDA4 ISP in SOC?"

VISS is as such a control driver, so does not take much R5F resources. But lets say if you are running AEWB algorithm, that could take R5F resources. Please refer to the datasheet, especially multi-camera usecase, to understand resources required. 

wang zhili said:

And whether this input bandwidth is shared by multiple cameras or single cameras?

There is no separate BW for multiple camera. Its same input channel used for all channels.

Regards,

Brijesh 

Thanks for your reply.

I also want to know that what is the maximum input bandwidth the TDA4 ISP supports?

Besides R5F, does VPAC also use the resources of A72 or other kernels (C71 or C66)? Are plugins other than AEWB not using R5F resources or only using resources at runtime? How much resources do these pludins use at runtime? Could you please give me a detailed introduction?

wang zhili said:

I also want to know that what is the maximum input bandwidth the TDA4 ISP supports?

this depends on the input resolution, bpp, storage format etc parameters. 

wang zhili said:

Besides R5F, does VPAC also use the resources of A72 or other kernels (C71 or C66)?

No, ISP does not require any other resources

wang zhili said:

Are plugins other than AEWB not using R5F resources or only using resources at runtime? How much resources do these pludins use at runtime? Could you please give me a detailed introduction?

I would suggest to refer to the datasheet.

Regards,

Brijesh

Hi,

Brijesh Jadav said:

this depends on the input resolution, bpp, storage format etc parameters. 

Isn't the maximum input bandwidth supported by TDA4 a fixed value or range?

Brijesh Jadav said:

I would suggest to refer to the datasheet.

Could you please tell me which specific part of the datasheet to refer? VPAC or Introduction?

Thanks.

wang zhili said:

Isn't the maximum input bandwidth supported by TDA4 a fixed value or range?

Do you mean DDR input BW? It really depends on the total available BW, resolution and fps.. There is no fixed value..

wang zhili said:

Could you please tell me which specific part of the datasheet to refer? VPAC or Introduction?

Please refer to datasheet of vision apps. 

Regards,

Brijesh

Is datasheet of vision apps an independent file? I can't find the content related to the vision apps in the Technical Reference Manual.

Hi,

Yes, it is available at below link.

https://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-jacinto7/latest/exports/docs/vision_apps/docs/datasheet/group_apps_basic_demos_app_single_cam_datasheet.html

https://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-jacinto7/latest/exports/docs/vision_apps/docs/user_guide/group_apps_basic_demos_app_multi_cam.html

Regards,

Brijesh

Thanks for your support.

Brijesh Jadav said:

It really depends on the total available BW, resolution and fps.. There is no fixed value..

If so, how can I calculate how many cameras can be connected to TDA4 at the same time? Can you provide the calculation method and judgment basis?

BR.

Well, multi-camera demo supports upto 8 camera of 2MP running at 30fps. 

At max, each CSIRX instance supports upto 16 camera and max lane speed is 10Gbps and max VPAC at approximately 600MP/s, so as long as you are within this limit and DDR BW is available, camera can be supported. 

For MP/s calculation, please camera resolution x fps. 

Regards,

Brijesh