| 摘要 |
PURPOSE:To utilize effectively multiple-bit arithmetic element when making calculation of multiple-bit and few-bit by calculating multiple-bit input using multiple-bit input arithmetic element, and at the same time, by calculating in case of few-bit input in parallel and independently. CONSTITUTION:Multiple-bit inputs A and B consisting of maximum N-bit is calculated by a multiple bit input arithmetic element LBCD and its arithmetic output C is outputted. In operating system using the arithmetic element LBCD, (m) sets of input pairs a0, a1, and a1, b2 ... am-1, bm-1 calculated independent to each other are made to input pairs that satisfies the equation when maximum bit for an input pair a1, b2 is made P1. Inputting is made providing at least space of 1 bit between input terminals A0-AN-1 and B0-BN-1 to which input A and input B of the arithmetic element LBCD are applied. Arithmetic in case of small input is made in parallel and independently, and the arithmetic element LBCD is utilized effectively in case of multiple-bit and few-bit. |
