Image processing apparatus and memory access method therefor
AssigneeCanon Kabushiki Kaisha
InventorHidenori Ozaki
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Abstract
An image processing apparatus and a memory access method use a memory control circuit to cyclically switch memory-access-job requests from a scanner, a printer, a facsimile machine, a page-description-language circuit, an interface circuit, and a refresh circuit whenever a storage medium in an image memory circuit is accessed.
Claims7
An image processing apparatus capable of alternative modes of operation for controlling access requests from a plurality of devices for performing different data processes, said image processing apparatus comprising:
- a memory;
- and
- control means for cyclically switching memory access requests from said plurality of devices whenever said memory is accessed in one operation mode, wherein said control means permits consecutive access to a predetermined memory access request from one of said plurality of devices in another operation mode.
A memory access method for an image processing apparatus for controlling access requests from a plurality of image input and/or output apparatuses using a single memory to perform different data processes, said memory access method comprising the step of cyclically switching memory-access-job requests from said plurality of image input and/or output apparatuses whenever the memory is accessed.
A storage medium for storing a computer-readable program for an image processing apparatus controlling memory access requests from a plurality of devices using a single memory to perform different data processes, said computer-readable program comprising code for cyclically switching memory access requests from said plurality of devices whenever the memory is accessed, wherein consecutive access to a predetermined memory access request from one of said plurality of devices is permitted.
Dependencies are inferred from the claim text.