| 摘要 |
PROBLEM TO BE SOLVED: To provide an interface apparatus between a DMAC and a companding module, the interface apparatus having simple configuration and capable of efficiently transferring image data. SOLUTION: The interface apparatus calculates a setting value of a line length being a processing unit of a compander on the basis of line length information of data transferred from a DMA controller and a line memory capacity of the compander. When the data amount transferred from the DMA controller is greater than the line memory capacity of a compression apparatus in the case of compression, the interface apparatus divides data of one line into data whose capacity is the line memory capacity or below, and the interface apparatus transfers the divided data several times to the compression apparatus. When the data amount transferred from the DMA controller is greater than the line memory capacity of an expansion apparatus in the case of expansion, the interface apparatus merges a plurality of line data outputted from the expansion apparatus as one line and transfers the resulting data to the DMA controller. COPYRIGHT: (C)2006,JPO&NCIPI
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