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Raspberry Pi with Usb3 as Southbridge

Posted: Thu May 09, 2019 7:32 pm
by evasjo
Hello,

Would the following concept be possible with Usb3 in a new Raspberry PI?
Connect a Raspberry Pi with Usb3 as Southbridge to a Usb3 hub.

A Raspberry Pi "Single board computer" with the following ports:
Usb-c port for power
Usb-c port for data // Usb3, think as Southbridge (connect with cable to Usb-c hub)
Micro SD port

A Raspberry Pi Usb-c hub with the following features:
Usb-c port for data // Usb3, think as Southbridge (connect with cable to Rpi Sbc)
Wlan and Bluetooth circuit
Ethernet port
USB 2.0 ports
CSI camera port
DSI display port
4-pole stereo output and composite video port
HDMI port
Extended 40-pin GPIO header

Advantages:
Raspberry Pi SBC could be very small.
Different Usb-c hubs could be built for different purposes.

Is it possible to use Usb3 (device class drivers) in this way?

Best Regards,
Evald

Re: Raspberry Pi with Usb3 as Southbridge

Posted: Thu May 09, 2019 8:44 pm
by jamesh
Usb3 wouldn't really be suitable, you need a proper bus to connect all that stuff together.

I'm sure something like it would be possible, just not very good.

Re: Raspberry Pi with Usb3 as Southbridge

Posted: Fri May 10, 2019 5:31 am
by W. H. Heydt
I think...perhaps...the OP is trying to re-invent the compute module, but using a--to him--idealized Pi4 SoC.

Note for the OP... The Pi3 SoC has a single USB 2 port. On the B-series boards is a hub-and-ethernet chip. However, the CM3 line uses the same SoC, but the module board only has the SoC, RAM and (optionally) eMMC flash mass storage. I suggest you take a look at the CM3+ boards. *If* (and note that is a very big "if") the Pi4 SoC has a USB 3 port, *then* you could design a carrier board to do much of what you want, right down to the use of USB-C connectors.

Re: Raspberry Pi with Usb3 as Southbridge

Posted: Mon May 20, 2019 1:17 pm
by evasjo
Thank you for sorting out my thoughts.

Re: Raspberry Pi with Usb3 as Southbridge

Posted: Mon May 20, 2019 3:41 pm
by jdb
Closing, as we've reached the weekly limit for "Raspberry Pi N+1 should have feature X" posts.