Hi Rami,
are you referring to SN3257-Q1?
I read the datasheet, it doesn't mention it support DSI.
DSI usually need 10 channel.
As for frequency they need at least 4.5GHz at least, the way I see TMUX646 is the best solution , right?
Hey Fred,
Sorry, yes the SN3257-Q1. So datasheets won't mention every signal the device can support. We certainly have devices that are more specialized for a specific protocol or signal but that doesn't mean other devices won't work. As long as the device can handle the voltage, frequency range and current being supported it will be an viable solution.
That being said, the total data throughput is 4.5GHz, correct? This won't be the same as the per lane bandwidth (See FAQ : [FAQ] How do I Select the Right Analog Switch/Multiplexer Bandwidth Based on the Data Rate of my Protocol?).
I found this example for MIPI online as well : 
If we have 4.5GHz and 4 lanes the line rate would be 1.125GHz.
According to what I've found, MIPI is also a double data rate interface, so reading would happen on the rising and falling edges: 
So we'll take the 1.125GHz and divide in half. Of course, I would confirm with the customer if the request is being understood properly but to me it seems we really only need to support ~562MHz per lane. In other words, we just need a mux that can handle above 600MHz (in reality I would recommend something that is closer to double this bandwidth though).
SN3257-Q1 is a 4 channel device so yes, it wouldn't be able to support this in a single-chip but we would have to make this a multi-chip solution (3 x SN3257-Q1) is being automotive is a requirement. It will provide for us a device that is automotive qualified that can handle the signals in question. Otherwise, we won't have an automotive qualified device that can support this bandwidth and the channel count.
May I ask who this customer is?
If automotive isn't a necessity, then you are correct that the TMUX646 would be the best option here.
Thanks,
Rami
