Patent Number: 6,298,404

Title: Digital copier with an unified memory which stores computer instructions and image data

Abstract: A digital copier or multifunction machine which has a unified memory structure so that a memory sub-system stores both computer instructions for controlling a processor within a digital copier and also image data to be printed, stored, or obtained from a scanner. The computer instructions and image data may be stored in the same semiconductor memory, if desired. Further, a single bus may be utilized to connect the memory sub-system to a memory controller which interfaces to the processor. In order to efficiently utilize a memory sub-system which stores both computer instructions and image data, a virtual memory control process may be utilized which efficiently pages the image data and/or computer instructions from a main memory to a mass storage device such as a hard disk drive. Thus, when more space is needed to store computer instructions or more space is needed to store image data, the virtual memory system may dynamically allocate the amount of memory for the image data and computer instructions, and also page the various types of data between the semiconductor memory of the digital copier and the mass storage device.

Inventors: Mishra; Sudhindra Nath (Milpitas, CA)

Assignee: Ricoh Company, Ltd.

International Classification: H04N 1/32 (20060101); C06F 013/00 ()

Expiration Date: 10/02/2018