DSP
From S1MP3 Wiki
The DSP used on ATJ2085 is an ADSP-21xx series. The host interface is the same as the registers that are exposed to the Z80. It won't be any ADSP-218x as they don't have a HIP.
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Binary extraction
Here it goes some script to extract binary images of dsp code and data from *.dsp file. http://www.s1mp3.org/files/pastebin/dsp_test.7z, http://www.s1mp3.org/files/pastebin/dsp_unpack.7z
About the ADSP21xx
- http://www.analog.com/processors/ADSP/ documentation
- http://download.analog.com/manuals/21xx/processorManuals/21xx_um.pdf family manual
- http://www.analog.com/processors/adsp/technicalLibrary/manuals/index.html other manuals
- http://www.kvaleberg.com/g21.html analog assembler/disassembler (1996)
Sample instructions
For reference: The first n instructions of the mp3dec.dsp file I have are:
1C 8C DF 1C 02 DF 18 00 2F 00 00 00 ... 93 E0 BA 40 00 1A 93 D0 9A 40 0F FA 93 E0 CA 40 0F F5 83 D0 81 23 89 0F 93 E0 8A 83 E0 91 23 89 0F
