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Message
From: ak56_n_ak47@r...
Date: Fri, 27 Dec 2002 06:16:05 -0100
Subject: [usb] Resume in OHCI
Hi
I am a sort of newbie involved in OHCI hardware development.
I have some doubt about OHCI.
First:
In EHCI spec, there are two power wells (auxilliary and core). No such
power wells are defined in OHCI spec. Why? Any specific reason they
are needed in EHCI only or is it because OHCI spec are written first and
this is improvement in EHCI?
Second:
When entire USB bus is suspended, should OHCI go to power saving
mode? At this time does clock gets turned off?
I guess answers to above questions is yes (correct me if i am wrong).
But main question is how does OHCI detect remote wakeup? Through a
combinational circuit? Is it the function of OHCI to restart the clock or
the analog transceiver does it? I think the analog transceiver provides
the clock to OHCI (correct me if I am wrong). Should I place the remote
wakeup detecting circuit in OHCI with aux power well for it?
Any answers on this will help.
Thanx in advance
ak
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