EHCI "on the go"

[Miguel Ángel Álvarez]

Hi.

Due to some problems with the EHCI in an IXP465, I have found that
this micro has an "on the go" feature. One of its features seems to be
an "Embedded Transaction Translator", that seems to be quite
"propietary".

I see in ehci.h, that using CONFIG_USB_EHCI_ROOT_HUB_TT, a function
called "ehci_port_speed" has been added, and the comments suggest to
implement the particularities of each controller with other functions.

The question is:
- Are there many different implementations (it seems there are not,
because I cannot see code for each of them... unless they are so
particular that they do not even use the general interface)?
- Is there any place comparing the similarities / differences between them?

Thanks

Miguel Ángel Álvarez
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