I got almost all of my wishes granted with RP2350

> 1 × USB 1.1 controller and PHY, with host and device support

Sure, after integrating USB 2.0 HS or 1Gb-Ethernet the pico2-board will cost more than $5. So, integrated high-speed interfacing with PC was not a nice-to-have option (for special chip flavor)?

I think the target here is low-power peripherals rather than speedy peripherals, and the price is very nice for that :)

>USB 2.0 HS

480 Mbps SERDES

> or 1Gb-Ethernet

1.25 Gbps SERDES

RP1 I/O chip on RPi5 has so many high-speed interfaces. I've been thinking RP2350 could be some smart I/O chip for a PC/notebook/network attached computers (with only 1 necessary high-speed connection).

Here [1] someone asked to make RP1 I/O chip available, but actually RP2350 is what would fit the purpose.

[1] https://www.raspberrypi.com/news/rp1-the-silicon-controlling...

GigE is actually PAM-4 at ~250 MBaud.

1.25 Gbps would be needed for low-pin-count SGMII interface to a PHY chip.