CXD2681

A Sony ATRAC3Plus (Hi-MD) IC, with multiple revisions. All models have 1MiB of Flash, 64k of SRAM, 16MiB of DRAM, and ARM7TDMI+ CPU cores.

For ease of use, we will format them into 2 groups: Pre-RH and RH. This simply splits them into the following models:

CXD2681-221GG

• Sony MZ-NH600 / MZ-NH600D / MD-HUSB

Datasheeet/Pinout

CXD2681-222GG

• Sony MZ-NH1

• Sony MZ-EH1

Datasheet/Pinout

CXD2681-223GG

• Sony MZ-NH900

• Sony MZ-NH700 / MZ-NHF800

• Sony MZ-EH50

• Sony MZ-EH70

Datasheet/Pinout

CXD2681-225GG

• Sony MZ-RH910 / MZ-M10

• Sony MZ-RH710 / MZ-DH710

• Sony MZ-RH10 / MZ-M100

Datasheet/Pinout

Thanks Sir68k and Asivery [*] for uploading firmware dumps!

Note: Not all models are dumped as of now, if you have a model that has not yet had it's firmware dump posted, please get in contact with either of them via Discord to discuss dumping it's firmware for preservation.