The document starts off with a standardized approach to constraining source-synchronous interfaces, called the Explicit Clock Method. This easy-to-understand method works whether the FPGA is the receiver or transmitter, and if the interfaces are center-aligned or edge-aligned.
Next is a section on the Implicit Clock Method, which I consider to be purely optional.
There is a section called Miscellaneous, which covers many of the details and points of confusion for source-synchronous DDR interfaces.
Finally are the examples. There are some generic examples(without projects) as well as analysis of four Texas Instrument devices interfacing to an FPGA.
I started a thread on this document in the alteraforum at: