CFI with 4 x8/x16 devices on a 32-bit bus

[Nicolas Pitre]

On Tue, 10 Apr 2001, Brett Carswell wrote:

> > To confirm:
> >  buswidth: obvious. (4 bytes)
> >  interleave: Number of devices accessible through a single
> > bus-width access (4)
> >  device type: _Device_ type (2). You ignore the 'A-1' line
> > because the magic
> > 	addresses still need to be on the 'A0' line and above,
>
> This last point does not seem to be the case. The datasheet says :
> Addresses are A19:A0 in word mode (BYTE# = V IH ), A19:A-1 in byte mode
> (BYTE# = V IL ).

At tis point it may all depend on how your hardware folks wired the chips...

> Not really much to be too confident about - but setting the LSB seems to be
> the only difference between a non-working and a working system.

To be sure, do a coherency test on your flash i.e. if you have 16MB then
generate 16MB of random data, write it to flash through MTD, read it back,
and compare.


Nicolas



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