| 摘要 |
PROBLEM TO BE SOLVED: To attain the high graphic drawing performance and the high cost performance in an entire system by preparing a preprocessing part at a coordinate conversion processing part to calculate the parameter that is given to a drawing processing part. SOLUTION: A CPU 3 includes a preprocessing part 13 and a main processing part 15. The part 13 calculates the initial value of DDA of the main processing, etc., and is mounted on a processor 1 not on the CPU 3. Thus, the I/F bus band width can be increased between a coordinate conversion unit 19 of the processor 1 and a main bus 7. Then, a processor core 17 has no overhead to produce a CPU command, so that the system performance is improved. In addition, the overall system cost performance is improved since the part 13 is prepared at the processor 1 despite the difference of process features recognized between the processor 1 and the CPU 3. |
