> For the complete documentation index, see [llms.txt](https://bananapi.gitbook.io/banana-pi-bpi-w2-with-realtec-rtd1296/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/banana-pi-bpi-w2-with-realtec-rtd1296/chapter1/bpi-r2-pcie-interface.md).

# BPI-W2 PCIe interface

**BPI-W2 PCIe interface**

BPI-W2 have 1 M.2 KEY E: PCIe 1.1/USB 2.0 interface and M.2 KEY E PCIe 2.1/SDIO/USB 2.0 interface, so you can use this interface to add more expanding application on this board.

![](https://2066668521-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M2HWtQqFLHQ4kO9KdDh%2F-M2HWv4olH00tP0BZDBQ%2F-M2HXKQsiuvCizoiKE33%2Fpcie.JPG?generation=1584080196659432\&alt=media)