| 摘要 |
PURPOSE:To improve the efficiency of a titled circuit by reducing the accessing frequency against the memory and by quickly performing unpackings and transferrings, by eliminating the necessity of unpacking to be performed by software when packed information is transferred by unpacking. CONSTITUTION:An unpacking circuit UC and a data register DR are installed in an intermemory transfer module 3 placed between an image memory 4 coupled with a display device 5 and a main memory 2 coupled with an external memory 6. The transfer module 3 reads out source data stored in Address A of the main memory 2 in accordance with preset command information, sets the data in the register DR, and write them in the image memory 4 through the unpacking circuit UC. Threrfore, transfer of image information stored in the external memory 6 in the form of 16 bits can be completed when the reading out R from the main memory 2 is performed one time and writing W in the image memory 4 is performed four times. |
