| 摘要 |
A method for calculating the initial value in the Newton-Raphson method by synthesization using values retrieved from a small table stored in a memory by means of an arithmetic unit. The method of the invention is free from problems of conventional dividers such as a long operating time and a large circuit scale. The iterative calculation circuit of the Newton-Raphson method is mounted as an arithmetic circuit. A reciprocal calculating circuit having a short operating time, usable as a pipeline system, and exhibiting an improved throughput and a dividing circuit comprising the reciprocal calculating circuit are mounted. Part of the multiplying circuit included in the iterative calculation circuit is omitted by regarding the calculation precision, thus making it a compact iterative calculation circuit. Further by using the interim results of the calculation, the calculation precision is readily enhanced. Thus, a method for calculating the minimum size required for the table used for calculating the initial value is provided, and means for designing a circuit of a requisite minimum while fulfilling the required calculation precision is also provided. <IMAGE> |
