Image memory system
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United States of America Patent
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Jan 6, 2004
Grant Date -
N/A
app pub date -
Dec 27, 1999
filing date -
Dec 28, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An object of the invention is to provide an image memory system capable of efficiently reading out image data also in case of consecutively reading out image data from an image memory along a direction other than the direction in which a burst access can be performed. In case that a bit-map image is partitioned into square or rectangular blocks and image data of pixels contained in one block are made to correspond to one row space, row spaces respectively corresponding to two blocks being adjacent to each other with a common side between them are made to belong to different synchronous DRAMs without fail and all of row spaces respectively corresponding to four blocks having commonly one vertex are made to belong to different banks. Thanks to this, blocks Aa-i and Aa-j are not adjacent to each other, and blocks Bb-i and Bb-j are not adjacent to each other, and therefore even in case of reading out image data of dots being consecutive crossing a side of a block, the same synchronous DRAM is not consecutively accessed before and behind the side.
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