fyi
Begin forwarded message:
From: Andy Green <[EMAIL PROTECTED]>
Date: February 8, 2008 1:48:43 AM GMT+08:00
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED]
, [EMAIL PROTECTED], Samuel Ortiz <[EMAIL PROTECTED]>
Subject: Re: Suspend mode measuring
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Somebody in the thread at some point said:
Therefore, I do some research in S3C2442 GPIO configure.
Hi Allen -
Roundup of resistor value changes from my side for consideration.
0) Can we eliminate R1519 / TX_MODEM pullup.
1) I went looking for more 10K resistors, I found some at the end on
the
WLAN SDIO bus. I wonder if the protocol really needs 10K here or if
we
can increase R7904 - R7907 to, eg, 47K. They're mainly used to stop
the
bus floating when nobody drives AFAIK so it should be fine.
2) I looked at other SDIO designs and they do not pull up the SD /
SDIO
clock line. Can make R7909 NC?
3) R1710 / R1741 is a bit of a strange pair. R1741 should be NC?
Or is
there a bigger story there?
4) Just a reminder about PMU I2C pullups R1707 and R1708 need to be
reduced to, eg, 22K or 10K to improve signal quality.
5) Another issue I brought up some time ago, we would stand a better
chance to run the Glamo SD interface at 25MHz if we reduced the
resistors R7503 - R7508 from 100R to say 75R -- it shouldn't really
impact EMC too much.
Also I didn't read about the configuration of the "5mA suspend" device
used in your testing, does it include Bluetooth and WLAN modules?
Hopefully it did include them, so it can be interesting to test
suspend
current with and without WLAN module, for example. I see we can't
switch WLAN power externally but still it is interesting.
- -Andy
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