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    • 1. 发明授权
    • Elementary function arithmetic unit
    • 基本功能运算单元
    • US4888721A
    • 1989-12-19
    • US94752
    • 1987-09-09
    • Eiki KondohShigeki MorinagaTakao YaginumaTakeshi Asai
    • Eiki KondohShigeki MorinagaTakao YaginumaTakeshi Asai
    • G06F7/544G06F17/17
    • G06F7/5446
    • A function arithmetic unit which performs elementary operations at high speeds and which enables required memory capacity to be reduced. The function arithmetic unit includes a constant memory which stores a constant that corresponds to the number of successive iterative operations; a controller which causes addition or subtraction in the successive iterative operations; and arithmetic units which receive, as initial values, an argument of an elementary function value to be found and two constants determined depending upon the elementary functions to be found, and which subject these initial values to n iterative operations to produce elementary function values. A further arithmetic unit subjects the elementary function values to multiplication, addition, subtraction, or division, or a combination thereof, thereby to produce the thus obtained value.
    • 一种功能运算单元,其以高速执行基本操作,并且能够减少所需的存储器容量。 所述功能运算单元包括:恒定存储器,存储对应于连续迭代操作次数的常数; 在连续迭代操作中产生加法或减法的控制器; 以及算术单元,其作为初始值接收要发现的基本函数值的参数和根据要发现的基本函数确定的两个常数,以及将这些初始值映射到n个迭代操作以产生基本函数值。 另外的运算单元将基本函数值进行乘法,加法,减法或除法或其组合,从而产生如此获得的值。