On Mon, 13 Oct 2008, Laurent Pinchart wrote:
> our hardware engineer asked me to make sure all unused GPIO pins are
> configured as outputs to avoid floating inputs. He got theory on his side
> (floating inputs can lead to higher current consumption, metastability or
> even permanent damage), but I'd like to ask the list for practical feedback.
>
> I haven't been able to find any mention of floating input protection in the
> MPC8248 documents. Has anyone here experienced issues with floating inputs in
> real-life designs ? Do you setup your board with all unused GPIO pins
> configured as outputs ?
I always thought configurable GPIO pins default to _inputs_ after power-on, so
it's safe to tie them to VCC through a pull-up resistor?
For CMOS, you can tie them to VDD or GND without a resistor.
With kind regards,
Geert Uytterhoeven
Software Architect
Sony Techsoft Centre Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium
Phone: +32 (0)2 700 8453
Fax: +32 (0)2 700 8622
E-mail: [EMAIL PROTECTED]
Internet: http://www.sony-europe.com/
A division of Sony Europe (Belgium) N.V.
VAT BE 0413.825.160 · RPR Brussels
Fortis · BIC GEBABEBB · IBAN BE41293037680010
_______________________________________________
Linuxppc-dev mailing list
[email protected]
https://ozlabs.org/mailman/listinfo/linuxppc-dev
