I am currently trying to incorporate a Freescale i.mx53 into a design. It has three USB High Speed hosts; one has a built in transceiver, the other two do not (OTG is not part of this discussion).
The other two hosts support the following transceivers (p4478 of the reference manual):
- ULPI (HS/FS/LS)
- Serial (HS/LS)
- IC-USB (FS)
Whilst I would normally use a ULPI, the required pads are being used by other peripherals and therefore I must use of the other PHY options. It connects to a 4-port hub close by one the same PCB.
Problem is, I have no idea who makes them or how to use them. Or if I need special Linux drivers for them. The closest, I've found (I think!) is a TI TUSB1105, but it only supports full-speed, not high speed.
Unfortunately, I know even less about IC-USB and Wikipedia isn't really helpful. Since only full-speed is supported, I can safely ignore this option for the moment.
So, I guess I'm asking:
- Can anyone recommend a serial high-speed USB PHY? If so, why?