Re: Embedded MPC860T & flash memory

Dear Laurent,

in message [off-list ref] you wrote:

As I need to be able to write to the memory using the MTD layer, I was
wondering if it would be better to use 2 16-bit wide chips in
interleaved mode on a 32-bit bus (connecting them in parallel to the
bus, one of them storing D[0:15] and the other one D[16:31]), or to use
them in non-interleaved mode (non-overlapping address ranges) on a
16-bit bus. It seems that the Linux MTD layer can support both
configurations, but I don't have a deep knowledge of that code, and thus
would appreciate any advice.

For the software it does not matter - both configurations will work.

For the performance it makes a BIG difference.

Go for a buswidth of 32 bits, i. e. use 2 chips in 16 bit mode in
parallel.

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
"The trouble with doing something right the first time is that nobody
appreciates how difficult it was."                        - Walt West

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For the software it does not matter - both configurations will work.

For the performance it makes a BIG difference.

Go for a buswidth of 32 bits, i. e. use 2 chips in 16 bit mode in
parallel.

Ok, thanks for your answer.

Laurent Pinchart


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