On Tue, 8 May 2012 14:51:52 +0200 Marek Vasut marex@denx.de wrote:
Dear David Jander,
On Tue, 08 May 2012 10:46:10 +0200
Stefano Babic sbabic@denx.de wrote:
On 07/05/2012 09:11, David Jander wrote:
Dear Stefano,
Hi David,
Yes, but is none of those boards using 3.15 or 3.3V? If they are, those bits must be cleared!
This is a good question - also because SD was tested and it is working on these cards. I am asking to myself how it can work if voltage is wrong.
That is the whole point: You probably won't notice anything with the wrong settings.... besides slightly lower drive-strength on the pin. Things should just work with either setting. The problem is that now Freescale is telling us that using the incorrect settings can cause "permanent damage" to the chip!!! No idea what sort of damage nor whether it occurs frequently.....
I think it might have something to do with ESD. It's probably unlikely to happen anyway.
Why do you think that? ESD protection is not something that could possibly have something to do with a running board and wrong PAD configuration bit settings. Or do you mean that IO-pad ESD protection is the thing that gets destroyed by wrong settings?
AFAICS, this bit probably enables and disables a different set of output transistors on the pad.
Whether damage is likely to happen or not, is not clear to me yet. I am waiting on a reply from Freescale about this issue right now. I will post any important findings here as soon as I know more.
Best regards,