Not being long off the "secret list", the user manuals for the Aurix TC275 have only been available to those registering at www.infineon.com with a corporate email address. However after representations to Infineon, they have agreed that they will put all 30MB of the TC275 user manual and datasheet on the public part of their website for anyone to access. This should be sometime this month.
That link appears to be the TC275 datasheet, not the user manual. The downloaded file is less than 4MB, not 27MB. Is this link broken, or is there another link to the User Manual or Reference Manual. The linked document is only 279 pages and I would expect the user manual for a part as complex as the TC275 to be several thousand pages.