[flashrom] [RFC] National Semiconductor DP83815 NIC patch

[Marko Kraljevic]

Hi Andrew,
This probably isn't too important, Most (all?) parallel flash can jive
with TTL levels (ie. >= 2V is high, <= 0,8V is low, in-between is
garbage).

eg. this datasheet (29F002) - see the Vil and Vih specifications.
http://www.datasheetcatalog.org/datasheets/150/489768_DS.pdf

However, it is essential that VCC be 5V, give or take. 3,3V will cause
errors. Are you saying Vcc is 3,3V? Or just the data/addr lines?

-Mark

On Mon, Jun 7, 2010 at 7:29 PM, Andrew Morgan <ziltro at ziltro.com> wrote:
> On 08/06/10 01:29, Andrew Morgan wrote:
>>
>> I have set it to 128K now, see comment in patch. I hope the comment is ok.
>>
> The 128KB comment might not be needed any more. It seems that 128KB is the
> correct maximum size.
> Using a multimeter I found that the voltage on A16 does change during a
> read. The other thing I found is that the network card uses 3.3v for the
> boot ROM, not 5v! As I have been doing all my tests with a 5v±10% 256KB
> flash chip, and one of the address lines was floating, I'm not surprised
> there was random data being read. (I am surprised that erase seemed to
> work.)
>
> So now all I need to do is find a 128KB 3.3v DIP32 parallel flash chip...
>
> --
>
> Andrew.
>
>
> _______________________________________________
> flashrom mailing list
> flashrom at flashrom.org
> http://www.flashrom.org/mailman/listinfo/flashrom