The XMC1000 S-series device Application Note is available at the Infineon Technologies website:
http://www.infineon.com/cms/en/produ...a0029#ispnTab3

Application Note

About this document
The XMC1000 S-series device provides Intellectual Property (IP) protection for your application code. The device has a boot mode which handles the download of the encrypted application code.
In this document, we give an overview of the IP protection scheme and the command set, we describe the flash programming flow of the XMC1000 S-series device, and provide instructions for encryption and downloading the application code to the S-series device using the Secure Download Manager tool provided by Infineon.