초록 ▼

A determining unit determines which area in an SDRAM is the area in which image data is stored. According to the determination of the determining unit, a control unit activates a power-down mode only for an area in the SDRAM, the image data being stored in the area. In order to determine whether or

A determining unit determines which area in an SDRAM is the area in which image data is stored. According to the determination of the determining unit, a control unit activates a power-down mode only for an area in the SDRAM, the image data being stored in the area. In order to determine whether or not the data stored in the SDRAM is image data, a code is previously added to the relevant data. Whether or not the relevant data stored in the SDRAM is image data is determined by the determining unit using the added code. A minimum of only one bit does well as the code for determining whether or not the data stored in the SDRAM is image data. Instead of previously adding a code to relevant data, it is also possible, for the same purpose, to store a code in an internal register of the SDRAM, the code indicating contents of data stored in the SDRAM.

대표청구항 ▼

[ What is claimed is:] [1.] A memory control system comprising:memory means for storing image data, said memory means including a plurality of a synchronous dynamic random access memory chips;determining means for determining which area in said memory means is said area in which said image data is s

[ What is claimed is:] [1.] A memory control system comprising:memory means for storing image data, said memory means including a plurality of a synchronous dynamic random access memory chips;determining means for determining which area in said memory means is said area in which said image data is stored; andcontrol means for activating a power-down mode only for an area in said memory means in which said image data has been stored, wherein said area includes a determined number of said plurality of synchronous dynamic random access memory chips.