TMUX646: 4:1 CSI-RX 4L Muxing

Alex Paul

Expert 5435 points

Part Number: TMUX646

Tool/software:

Dear Experts,

I would like to add for cameras to an MPU with 1x CSI-RX 4L Interface.

The Appnote: Developing Multiple-Camera Applications on AM62x

Describes a 4:1 line aggregator. I could not find any part that is capable to do this.
Can I use the following setup to aggregate 4-CSI Cameras to 1 CSI RX Port as described below?

Kind Regards,
Alex

over 1 year ago

0 Rami Mooti1 over 1 year ago

TI__Mastermind 35648 points

Hi Alex,

Should work but be mindful that when you put back to back muxes in series your performance diminishes since you're adding more to bus. Do you happen to know the symbol rate?

See this app note for a little more on the effects of those cascading muxes
https://www.ti.com/lit/an/scda047/scda047.pdf?ts=1707976166013

Thanks,
Rami

0 Alex Paul over 1 year ago in reply to Rami Mooti1

TI__Expert 5435 points

Thanks Rami,

Do you know if there is any plan from TI to have a 4 channel Aggregator ?

Regards,

Alex

0 Rami Mooti1 over 1 year ago in reply to Alex Paul

TI__Mastermind 35648 points

Hi Alex,

Currently we have no plans for a 4 channel aggregator. Best case would be to do as you're currently doing or thinking about this more, I think you could probably do away with the second TMUX646 and just use the /OE pins. Basically just shorting the outputs together and only turning on the device that is connected to the camera they want to access. You'd still have extra Coff added from the off channel but it should have less effect than having a second mux to go through.
So tie the select pins together and then have the /OE toggle which one if being selected.

Thanks,
Rami

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TMUX646: 4:1 CSI-RX 4L Muxing