fyi
Begin forwarded message:
From: Werner Almesberger <[EMAIL PROTECTED]>
Date: February 8, 2008 2:09:28 AM GMT+08:00
To: Andy Green <[EMAIL PROTECTED]>
Cc: [EMAIL PROTECTED], [EMAIL PROTECTED],
[EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED],
Samuel Ortiz <[EMAIL PROTECTED]>
Subject: Re: Suspend mode measuring
Andy Green wrote:
2) I looked at other SDIO designs and they do not pull up the SD /
SDIO
clock line. Can make R7909 NC?
Having a pull-up on the clock definitely sounds like a bug, yes.
3) R1710 / R1741 is a bit of a strange pair. R1741 should be NC?
Or is
there a bigger story there?
I think the story goes like this: ultimately, we would have liked to
have a (very weak) pull-down there, so that we can use KEEPACT to
signal that the CPU have come out of reset and is in charge.
R1710 is only there to make KEEPACT work until we've implemented and
tested the software side of it.
However, if we're going to drop that functionality anyway, we should
remove R1741 and probably also make R1710 a bit larger. KEEPACT leaks
up to 1uA, so 100kOhm for R1710 would be perfect.
- Werner
