| 摘要 |
PURPOSE:To simplify circuit constitution, by storing the first half of a picture data of one line in a line memory via a random access memory, nd the latter half part in the line memory directly. CONSTITUTION:At the time of starting the input of an n-th line picture data, an (n-1)-th line data is stored in a line data DMARAM 8, and it is outputted to an imprinting part 6 with DMA transfer. During the DMA transfer, a DMA bus switch 9 is set in a closed state, and a data bus line is separated, and no n-th line data from a picture data input part 4 can be stored in the DMARAM 8, therefore, it is stored in a work RAM 3. After the transfer of the (n-1)-th line data being completed, the data is stored directly in the DMARAM 8 according to a synchronizing signal in a video signal by opening the switch 9, and also, the data stored in the RAM 3 is transferred to the RAM 8, then, the storage of the n-th line picture data is completed. In such a way, it is enough only to to prepare a pair or DMARAM address switchers and a pair of DMA bus switches, which simplifies the circuit constitution. |
