A graphics system may include a frame buffer, a processing device coupled to output data, a multipurpose memory device that includes a plurality of storage locations and is coupled to store data output from the processing device, and a multipurpose memory controller coupled to the multipurpose memory...http://www.google.com.hk/patents/US6906720?utm_source=gb-gplus-share專利 US6906720 - Multipurpose memory system for use in a graphics system
