Apparatus, systems and methods for controlling data overlay in multimedia data processing and display systems using mask techniques

摘要

A memory system 107,300 is provided which includes a memory 107 having a data area for storing data words and a mask area 302 for storing a control mask. Mask generation circuitry 301 is provided for generating such a control mask for storage in the mask area 302 of the memory 107. Mask controlled memory read control circuitry 303 is provided which is operable to selectively retrieve from the mask area 302 bits of the mask stored therein and in response selectively retrieve and output data words stored in the data area of the memory 107.