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Sansa Clip DSP datasheet (help needed)

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vanilla:
Hello everyone!
I am really hoping for your help:
I am a student and I am searching for a cheap DSP unit with one I/O. My promotor suggested that I could use those in simple mp3 players. As I have few old Sansa Clips laying around I opened one up, just to find out it's Sansas own creation. As I can't find datasheet on my own, I would really like to ask you for help. I need to know how that DSP works before I can use it in my science project. Or maybe someone know some other cheap DSP units?
Thank you in advance for all the help.

saratoga:
Modern mp3 players rarely use DSPs, but they do have arm processors. No data sheet exists for the newer clips but the original has one available on the wiki.

charleski:
The chip is badged with Sansa's branding, which is common for large runs produced to order. According to the code the Clip+ and ClipZip use a SoC from Austria Micro Systems that's called the AS3525v2, this itself covers a covers a couple of different cores, the Clip+/Zip one being the AS3543 The datasheet for the AS3543 is here. You can learn more about the AS3525 famnily here.

wodz:
Rockchip rk27xx has ZSP500 DSP core, Actions ATJ213x has ADSP-21xx clone with 24bit mode (WSP2416 most probably).

wodz:
There is also range of s1mp3 players with Z80 + WSP2416 DSP

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