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    • 3. 发明授权
    • Data processing system with coprocessor
    • 数据处理系统与协处理器
    • US4894768A
    • 1990-01-16
    • US21007
    • 1987-03-02
    • Kazuhiko IwasakiTsuneo FunabashiIkuya KawasakiHideo InayoshiAtsushi HasegawaTakao YaginumaEiki Kondoh
    • Kazuhiko IwasakiTsuneo FunabashiIkuya KawasakiHideo InayoshiAtsushi HasegawaTakao YaginumaEiki Kondoh
    • G06F15/16G06F9/38G06F15/167
    • G06F15/167G06F9/3877
    • When a microprocessor fetches an instruction to be processed by a coprocessor, it sends to the coprocessor a command corresponding to the instruction while informing the coprocessor that the bus cycle is in the mode of transfer of the instruction to the coprocessor. In transferring an operand from the memory to the coprocessor, the microprocessor asserts, in addition to a usual memory read signal, a signal (CYCYCL) indicative of validity of the coprocessor and instructs the coprocessor to fetch data to thereby complete the operand transfer from memory to coprocessor within one bus cycle. In transferring data from the coprocessor to the memory, the microprocessor asserts, in addition to a usual memory write signal, the CYCYCL signal and instructs the coprocessor to deliver the data to thereby complete the data transfer from memory to coprocessor within one bus cycle. Thus, the signal transfer between memory and coprocessor can be completed within one bus cycle without resort to the provision of duplicate hardware in the coprocessor.
    • 当微处理器提取要由协处理器处理的指令时,它向协处理器发送与指令相对应的命令,同时通知协处理器总线周期处于向协处理器传送指令的模式。 在将操作数从存储器传送到协处理器时,除了通常的存储器读取信号之外,微处理器还断言指示协处理器的有效性的信号(&upbar&C /),并且指示协处理器提取数据从而完成操作数传送 从一个总线周期内的存储器到协处理器。 在将数据从协处理器传输到存储器时,微处理器除了通常的存储器写入信号之外,还断言&upbar&C /信号并指示协处理器传送数据,从而完成在一个总线周期内从存储器到协处理器的数据传输 。 因此,存储器和协处理器之间的信号传输可以在一个总线周期内完成,而不需要在协处理器中提供重复的硬件。
    • 5. 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。