Messages in this thread | | | Date | Mon, 10 Nov 2008 09:48:46 -0800 | From | "H. Peter Anvin" <> | Subject | Re: EHCI "on the go" |
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Miguel Ángel Álvarez wrote: > 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? >
I only know of one interface for this, which is based on hardware IP I believe is currently owned by ChipIdea. It's pretty straightforward; it functionally does the same translation for the root port as a separate hub would do for a full speed/low speed downstream port.
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