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    • 5. 发明授权
    • Data access apparatus for preventing further cache access in case of an
error during block data transfer
    • 数据访问装置,用于在块数据传输期间发生错误时防止进一步的高速缓存访​​问
    • US5544341A
    • 1996-08-06
    • US454893
    • 1995-05-31
    • Hiromasa NakagawaAkira YamadaMasayuki Hata
    • Hiromasa NakagawaAkira YamadaMasayuki Hata
    • G06F12/08G11C29/00G06F13/00G06F11/00
    • G11C29/88G06F12/0879
    • A data processor and method for preventing access to a cache memory when an abnormality occurs during a block data transfer. The data processor is provided with a central processing unit (CPU), a memory and the cache which stores a part of the data being stored in the memory. When the data to be accessed by the central processing unit is not stored in the cache, the data processor employs a block transfer method where the central processing unit reads out from the memory a block of data, including a predetermined number of data (words) in which the data to be accessed is located. When an abnormality, such as a parity error, is detected in transferring a data word in the block of data to be accessed, the cache is inhibited from reading another data word in the block to be accessed, and the CPU stops reading out the rest of the block of data to be read out from the memory, so that the central processing unit can immediately take action to respond to the abnormality.
    • 一种用于在块数据传送期间发生异常时防止对高速缓存存储器的访问的数据处理器和方法。 数据处理器设置有中央处理单元(CPU),存储器和存储存储在存储器中的一部分数据的高速缓存。 当中央处理单元要访问的数据不存储在高速缓存中时,数据处理器采用块传送方法,其中中央处理单元从存储器读出包括预定数量的数据(字)的数据块, 其中要访问的数据位于其中。 当在传送要访问的数据块中的数据字中检测到诸如奇偶校验错误的异常时,禁止高速缓存读取要访问的块中的另一个数据字,并且CPU停止读出其余部分 的数据块从存储器读出,使得中央处理单元可以立即采取动作来响应异常。
    • 6. 发明授权
    • Microprogram control device for controlling data path section including
designation of instruction cycle values
    • 用于控制数据路径部分的微程序控制装置,包括指令周期值的指定
    • US5454088A
    • 1995-09-26
    • US62183
    • 1993-05-17
    • Hiromasa NakagawaTsunenori Umeki
    • Hiromasa NakagawaTsunenori Umeki
    • G06F9/26
    • G06F9/264
    • A microprogram control device controls a data path section provided in a CPU, which uses a microcode stored in a microprogram memory by using a microprogramming method. The control device includes an instruction register for storing an instruction code which is received from a data bus and an address generator for generating an address signal to access the microprogram memory, from the output of the instruction register. The address generator uses a first address decoder for decoding the type of the instruction from a particular bit in the instruction code and a second address decoder for decoding the addressing mode of the instruction from another particular bit of the instruction code. A third address decoder is included for designating the timing for accessing the microprogram memory at each cycle of the instruction.
    • 微程序控制装置通过使用微程序方法来控制CPU中提供的数据路径部分,其使用存储在微程序存储器中的微代码。 控制装置包括指令寄存器,用于从指令寄存器的输出存储从数据总线接收的指令代码和用于产生访问微程序存储器的地址信号的地址生成器。 地址生成器使用第一地址解码器来对来自指令代码中的特定位的指令的类型进行解码,以及第二地址解码器,用于从指令代码的另一特定位解码指令的寻址模式。 包括第三地址解码器,用于指定在指令的每个周期访问微程序存储器的定时。
    • 8. 发明授权
    • Manchester type carry propagation circuit
    • 曼彻斯特型进位传播电路
    • US4807176A
    • 1989-02-21
    • US838302
    • 1986-03-10
    • Akira YamadaToyohiko YoshidaHiromasa Nakagawa
    • Akira YamadaToyohiko YoshidaHiromasa Nakagawa
    • G06F7/50G06F7/503G06F7/506
    • G06F7/503G06F2207/3872
    • A Manchester type carry propagation circuit of this invention has a precharge clock signal (24) applied to the gate of an NMOS transistor (23) having a high threshold, to precharge a carry signal line (22) to an intermediate potential. When a carry signal (27) of the preceding stage attains to the "H" level, a transistor (26) turns on to transmit the potential of the carry signal line (22) to the succeeding stage, and when a carry propagation signal (37) attains to the "H" level, a transistor (36) turns on to propagate a carry of the preceding stage to the carry signal line (22). Then, the intermediate level of the carry signal line (22) is pulled up to the level of the source potential (21) by a pull-up circuit (30). Consequently, the level of the carry signal line (22) can be propagated to the succeeding stage at high speed.
    • 本发明的曼彻斯特式进位传播电路具有预加电时钟信号(24),该预充电时钟信号(24)施加到具有高阈值的NMOS晶体管(23)的栅极,以将进位信号线(22)预充电至中间电位。 当前级的进位信号(27)达到“H”电平时,晶体管(26)导通,将进位信号线(22)的电位传输到后级,当进位传播信号 37)达到“H”电平,晶体管(36)导通,将前级的进位传送到进位信号线(22)。 然后,通过上拉电路(30)将进位信号线(22)的中间电平上拉到电位电平(21)的电平。 因此,进位信号线(22)的电平可以高速传播到后级。