> For the complete documentation index, see [llms.txt](https://bananapi.gitbook.io/bpi-m2-ultra-open-source-single-board-computer/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bananapi.gitbook.io/bpi-m2-ultra-open-source-single-board-computer/referencedocuments/allwinnerr40chipdatasheet.md).

# Allwinner R40/V40 chip datasheet

Allwinner V40 datasheet:

<https://drive.google.com/file/d/0B4PAo2nW2KfneE54VzVOdHpITzA/view?usp=sharing>

Allwinner R40 datasheet:

<https://drive.google.com/file/d/0B4PAo2nW2KfnbVp2TmRMYUdPUGM/view?usp=sharing>

Allwinner R40 User Manual v1.0

<https://github.com/tinalinux/docs/blob/r40-v1.y/Allwinner_R40_User_Manual_V1.0.pdf>

axp221s PMU datasheet:

<https://drive.google.com/file/d/0B4PAo2nW2KfnM2pnT19zZW5qOTA/view?usp=sharing>