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    • 7. 发明授权
    • Apparatus for JTAG-driven remote scanning
    • 用于JTAG驱动远程扫描的装置
    • US08914693B2
    • 2014-12-16
    • US13397544
    • 2012-02-15
    • Martin DoerrBenedikt GeukesHolger HorbachMatteo MichelManfred Walz
    • Martin DoerrBenedikt GeukesHolger HorbachMatteo MichelManfred Walz
    • G01R31/28G01R31/3177G01R31/3185
    • G01R31/3177G01R31/318552G01R31/318572G06F11/267
    • A scan circuit (JTAG 1149 extension) for a microprocessor utilizes transport logic and scan chains which operate at a faster clock speed than the external JTAG clock. The transport logic converts the input serial data stream (TDI) into input data packets which are sent to scan chains, and converts output data packets into an output data stream (TDO). The transport logic includes a deserializer having a sliced input buffer, and a serializer having a sliced output buffer. The scan circuit can be used for testing with boundary scan latches, or to control internal functions of the microprocessor. Local clock buffers can be used to distribute the clock signals, controlled by thold signals generated from oversampling of the external clock. The result is a JTAG scanning system which is not limited by the external JTAG clock speed, allowing multiple internal scan operations to complete within a single external JTAG cycle.
    • 用于微处理器的扫描电路(JTAG 1149扩展)利用以比外部JTAG时钟更快的时钟速度工作的传输逻辑和扫描链。 传输逻辑将输入串行数据流(TDI)转换成输入数据包,将其发送到扫描链,并将输出数据包转换为输出数据流(TDO)。 传输逻辑包括具有分片输入缓冲器的解串器和具有分片输出缓冲器的串行器。 扫描电路可用于边界扫描锁存器的测试,或用于控制微处理器的内部功能。 本地时钟缓冲器可用于分配时钟信号,由外部时钟过采样产生的信号控制。 结果是JTAG扫描系统不受外部JTAG时钟速度的限制,允许多个内部扫描操作在单个外部JTAG周期内完成。
    • 8. 发明授权
    • DRAM chip and decoding arrangement and method for cache fills
    • DRAM芯片和缓存填充的解码布置和方法
    • US5388240A
    • 1995-02-07
    • US751495
    • 1991-08-29
    • Ulrich OlderdissenManfred Walz
    • Ulrich OlderdissenManfred Walz
    • G06F12/04G06F12/0855G06F12/0879G06F12/00G06F12/06G06F13/00G06F13/23
    • G06F12/0879G06F12/04G06F12/0859
    • A data mechanism having a random access memory (RAM) which has a plurality of groups of memory chips, each group being divisible into two equally sized chip sets. Each group of memory chips is addressed by a first address and each individual memory chip is addressed by a second address. The random access memory contains stored data. A cache, connected to the RAM, stores a portion of data stored in the RAM and is accessed by a cache address for separately reading requested data therefrom. The cache provides a cache miss signal when it does not contain the requested data. A CPU, connected to the cache and the RAM, receives the cache miss signal and provides responsive thereto, a starting address to the random access memory for starting a block transfer from the random access memory to the cache in two shots. The starting address includes the first address and the second address. The starting address identifies the group and individual chip within the group which contains the first bit which, when attempted to be read from the cache, caused the cache miss signal. A decoder, connected to the CPU and the random access memory, receives the starting address from the CPU and enables a first block data transfer from a first chip set in a first shot of the two shots starting from said first bit which caused the cache miss signal, and further enables a second block data transfer from a second chip set in a second of the shots.
    • 一种具有随机存取存储器(RAM)的数据机制,其具有多组存储器芯片,每组可分为两个相同大小的芯片组。 每组存储器芯片由第一地址寻址,并且每个单独的存储器芯片由第二地址寻址。 随机存取存储器包含存储的数据。 连接到RAM的高速缓存存储存储在RAM中的数据的一部分,并由高速缓存地址访问,用于分别读取所请求的数据。 当高速缓存未包含请求的数据时,缓存提供高速缓存未命中信号。 连接到高速缓存和RAM的CPU接收高速缓存未命中信号,并向其提供起始地址到随机存取存储器,用于在两次镜头中开始从随机存取存储器到高速缓冲存储器的块传送。 起始地址包括第一个地址和第二个地址。 起始地址标识组内包含第一位的组和单独芯片,当尝试从高速缓存读取时,导致高速缓存未命中信号。 连接到CPU和随机存取存储器的解码器从CPU接收起始地址,并且使得能够从所述第一位开始的第一个芯片组中的第一个芯片组中的第一个块数据传输,从导致高速缓存未命中的所述第一个位 信号,并且还使得能够从第二芯片组中的第二个芯片组中的第二块数据传输。