20130069965 | TWO DIMENSIONAL MEMORY ACCESS CONTROLLER - A memory control device derives a two dimensional location on a graphic display surface from address signals of a graphics processing unit (GPU). The memory controller compares the derived two dimensional location to a two dimensional range of authorized locations corresponding to a subset of the display surface. The memory controller modifies the address signals of the graphics processing unit (GPU) if the address signals do not fall within the two-dimensional range of authorized locations corresponding to a subset of the display surface, and propagates the address signals unmodified to a display memory otherwise. | 03-21-2013 |