Where are the documents for Chip-Tap controller?

[jerryXCORE]

As stated in datasheet of "XS1-L16A-128-QF124":
The boundary scan TAP is a standard 1149.1 compliant TAP that can be used for boundary scan of the I/O pins. The chip TAP provides access into the xCORE Tile, switch and OTP for loading code and debugging.

But where are the documents for chip TAP?

Thanks!