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Subject: Re: Rockbox in FLASH (I'm serious), updates
From: idc-dragon_at_gmx.de
Date: 2003-05-14


Tonight we opened a Recorder (I had to do the 8MB mod for Dirk to have a
reason), had a look and did some measurements on the Flash chip select line.

We found that the Flash chip inside is a SST39VF512, more modern than the
SST37VF512 in the schematics. Most important is that this does not need a
programming voltage, so the software _can_ write to it! Other features are 100.000
cycles endurance and sector programming.

On a side note, the footprint has address line A18 connected, so it is
prepared for a 512KB chip (twice the size).

The original firmware copies itself to RAM at startup. After doing so, it
only accesses the Flash once every 13 ms, doing only a single cycle. Maybe
there is a timer interrupt vector still active or so.
Rockbox is not accessing the Flash in normal operation.

So in summary, it looks pretty good for a "Rombox".

Jörg

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