[flashrom] [RFC] National Semiconductor DP83815 NIC patch
krasnaya.zvezda at gmail.com
Wed Jun 9 03:24:25 CEST 2010
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
eg. this datasheet (29F002) - see the Vil and Vih specifications.
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?
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
> So now all I need to do is find a 128KB 3.3v DIP32 parallel flash chip...
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