| 摘要 |
PURPOSE:To shorten the time of the setting of address data to address registers by a controller by providing two address registers which increase or decrease their stored address data by one according to a control signal from the controller. CONSTITUTION:The top address of a readout area of a video memory and the top address of a write area of the video memory are stored in the registers 3 and 5 respectively. Then, the setting of the registers 3 and 5 for reading and writing next image data are performed at the same time by the signal from the controller 4 after the first image processing. Further, when addresses assigned to individual memory cells of the memory 2 consist of N bits, the setting of the address data of the registers 3 and 5 for processing the 2nd and succeeding image data is performed at the same time by the 1st-time control output from the controller even when the amount of data outputted from the controller 4 at the same time is smaller than N bits. Therefore, the setting time of address data is shortened. |
