| 摘要 |
PURPOSE:To execute a high speed raster operation by preventing an idle state from being generated in the course of the raster operation. CONSTITUTION:A source data register 2 is constituted of four pieces of registers SDRA, SDRB, SDRC and SDRD, a destination data register 4 is constituted of two pieces of registers DDRA, DDRB, a bit arithmetic part 5 is constituted of two pieces of arithmetic parts BitopA, BitopB, and an output of a shifter 3 is provided by two systems. Also, this device is constituted so that the outputs of two systems of the shifter 3 are outputted by distributing them to two pieces of bit arithmetic parts 5, outputs of the DDRA and the DDRB and also outputted by distributing them to two pieces of bit arithmetic parts 5, and to the source data register 2, source data is inputted successively in prescribed order, and to the destination data register 4, data is inputted alternately. |
