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    • 95. 发明专利
    • Arithmetic processing unit, information processing device, and control method
    • 算术处理单元,信息处理设备和控制方法
    • JP2011150691A
    • 2011-08-04
    • JP2010264381
    • 2010-11-26
    • Fujitsu Ltd富士通株式会社
    • YAMAZAKI IWAOIMAI HIROYUKI
    • G06F9/318G06F9/30G06F12/08
    • G06F9/30047G06F9/3017G06F9/30189
    • PROBLEM TO BE SOLVED: To easily read a result of a cache hit check without a dedicated transfer bus.
      SOLUTION: An arithmetic processing unit 10 has a debug flag bit 31a that indicates whether to perform the cache hit check to check a cache state. When the flag bit indicates to perform the cache hit check and a prefetch instruction is received, the prefetch instruction is extended to perform the cache hit check. When the cache hit check is performed, the arithmetic processing unit 10 stores a result of the cache hit check in an L1 hit information register 32 to read the cache hit check result stored in hit information registers 23 and 32.
      COPYRIGHT: (C)2011,JPO&INPIT
    • 要解决的问题:为了容易地读取没有专用传输总线的高速缓存命中检查的结果。 解决方案:算术处理单元10具有调试标志位31a,其指示是否执行高速缓存命中检查以检查高速缓存状态。 当标志位指示执行高速缓存命中检查并且接收到预取指令时,预取指令被扩展以执行高速缓存命中检查。 当执行高速缓存命中检查时,算术处理单元10将高速缓存命中检查的结果存储在L1命中信息寄存器32中,以读取存储在命中信息寄存器23和32中的高速缓存命中检查结果。 C)2011,JPO&INPIT
    • 96. 发明专利
    • Microcomputer
    • 微机
    • JP2011008760A
    • 2011-01-13
    • JP2010049377
    • 2010-03-05
    • Renesas Electronics Corpルネサスエレクトロニクス株式会社
    • OTANI SUGAKOKONDO HIROIKU
    • G06F21/02G06F9/30G06F9/34G06F12/14
    • G06F9/30123G06F9/30054G06F9/30138G06F9/30189G06F9/3861
    • PROBLEM TO BE SOLVED: To provide a microcomputer that optimizes efficiency of use of general-purpose registers.SOLUTION: A control part 13 controls execution of an instruction according to a decode result of an instruction code. A GRA register 32 stores an access attribute for each of a plurality of general-purpose registers. A mode storage part 31 stores a mode for controlling an operation of a CPU. When the control part 13 makes a request for access to a general-purpose register, a register access allowance determining circuit 33 determines whether the access to the general-purpose register is to be allowed or not, depending on the access attribute stored in the GRA register 32 and the mode stored in the mode storage part 31. The number of general-purpose registers used according to the mode therefore is changed, so that efficiency of use of the general-purpose registers is optimized.
    • 要解决的问题:提供一种优化通用寄存器使用效率的微型计算机。解决方案:控制部分13根据指令代码的解码结果控制指令的执行。 GRA寄存器32存储多个通用寄存器中的每一个的访问属性。 模式存储部31存储用于控制CPU的动作的模式。 当控制部分13请求访问通用寄存器时,寄存器访问许可确定电路33根据存储在GRA中的访问属性来确定是否允许访问通用寄存器 寄存器32和存储在模式存储部分31中的模式。因此,根据该模式使用的通用寄存器的数量被改变,使得通用寄存器的使用效率被优化。