| 摘要 |
PURPOSE:To reduce the circuit scale by providing an adding circuit adding the output data of the multiplier and the output data of the shift circuit. CONSTITUTION:If the word length of the data pattern F being the object to be multiplied to input data I in a multiplier 1 is defined as n, the output data of the multiplier 1 is shifted by n-bit in a shift circuit 2-1. In an adding circuit 3-1, the multiplying result of the input data I and the factor that the word length composed by repeating the data pattern F like nonterminating decimal two times is 2n-bit can be substantially obtained by adding the output of the multiplier 1 and the output data of the shift circuit 2-1. Therefore, the multiplication of a factor that the word length is long and the input data can be performed with the multiplier 1 with small scale circuit for the factor that the word length is short. |
