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    • 55. 发明授权
    • Low-power static column redundancy scheme for semiconductor memories
    • 半导体存储器的低功耗静态列冗余方案
    • US06603690B1
    • 2003-08-05
    • US10091663
    • 2002-03-06
    • Howard Hao ChenLouis Lu-Chen HsuLi-Kong Wang
    • Howard Hao ChenLouis Lu-Chen HsuLi-Kong Wang
    • G11C700
    • G11C29/802
    • A static column redundancy scheme for a semiconductor memory such as an eDRAM. By utilizing the existing scan registers for SRAM array testing, the column redundancy information of each bank or each microcell of the memory chip can be scanned, stored and programmed during the power-on period. Two programming methods are disclosed to find the column redundancy information on the fly. In the first method, the column redundancy information is first stored in the SRAM, and is then written into the program registers of the corresponding bank or microcell location. In the second method, the column redundancy information is loaded directly into the program registers of a bank or microcell location according to the bank address information without loading the SRAM. Since the new static column redundancy scheme does not need to compare the incoming addresses, it eliminates the use of control and decoding circuits, which significantly reduces the power consumption for memory macros.
    • 用于诸如eDRAM的半导体存储器的静态列冗余方案。 通过利用现有的扫描寄存器进行SRAM阵列测试,可以在上电期间扫描,存储和编程存储器芯片的每个存储体或每个微单元的列冗余信息。 公开了两种编程方法来即时查找列冗余信息。 在第一种方法中,列冗余信息首先存储在SRAM中,然后被写入对应的存储体或微小区位置的程序寄存器中。 在第二种方法中,列冗余信息根据存储体地址信息被直接加载到存储体或微小区位置的程序寄存器中而不加载SRAM。 由于新的静态列冗余方案不需要比较输入地址,因此无需使用控制和解码电路,这显着降低了存储宏的功耗。
    • 58. 发明授权
    • Data retention registers
    • 数据保留寄存器
    • US06437623B1
    • 2002-08-20
    • US09782435
    • 2001-02-13
    • Louis L. HsuWei HwangStephen V. KosonockyLi-Kong Wang
    • Louis L. HsuWei HwangStephen V. KosonockyLi-Kong Wang
    • H03K3289
    • H03K3/0375G01R31/319H03K3/35625
    • A data retention system has master-slave latches for holding data in an active mode; a data retention latch for preserving data read from the master latch in a sleep mode, which is connected to the master latch in parallel with the slave latch; a first multiplexer for receiving data externally provided and feedback data from the data retention latch, and selectively outputting either the data externally provided or the feedback data to the master latch in response to a first control signal; and a second multiplexer for transferring output data of the master latch to the slave latch and the data retention latch in response to a second control signal, wherein power for the data retention latch remains turned on in the sleep mode, while power for the data retention system except for the data retention latch is turned off. The data retention latch may include gate transistors controlled by the second control signal and a data holding unit having transistors for holding data transferred through the gate transistors, wherein the gate transistors and the transistors in the data holding unit have a high-threshold voltage.
    • 数据保留系统具有用于保持活动模式下的数据的主从锁存器; 数据保持锁存器,用于在休眠模式下保存从主锁存器读取的数据,其与从锁存器并行连接到主锁存器; 第一多路复用器,用于接收外部提供的数据并从数据保持锁存器反馈数据,并且响应于第一控制信号选择性地输出外部提供的数据或反馈数据到主锁存器; 以及第二多路复用器,用于响应于第二控制信号将主锁存器的输出数据传送到从锁存器和数据保持锁存器,其中数据保持锁存器的电源在睡眠模式下保持导通,而数据保持功率 系统除了数据保持锁存器被关闭。 数据保持锁存器可以包括由第二控制信号控制的栅极晶体管和具有用于保持通过栅极晶体管传送的数据的晶体管的数据保持单元,其中数据保持单元中的栅极晶体管和晶体管具有高阈值电压。
    • 59. 发明授权
    • Refresh control circuit for low-power SRAM applications
    • 刷新控制电路,用于低功耗SRAM应用
    • US06434076B1
    • 2002-08-13
    • US09766799
    • 2001-01-22
    • John E. AndersenLouis L. HsuStephen KosonockyLi-Kong Wang
    • John E. AndersenLouis L. HsuStephen KosonockyLi-Kong Wang
    • G11C800
    • G11C7/1072G11C11/406
    • A power management circuit for an SRAM system including one or more isolated memory arrays and implementing a power source including a local power supply associated with each memory array and an external power supply connected to local supplies during an active mode of operation. The power management circuit comprises: a switch mechanism for disconnecting the external power supply to each of local power supply during a low power mode of operation; and, a refresh timing circuit implementing memory array refresh operation by selectively connecting the external power supply to a respective local power supply during the low power mode. During the low power mode, the refresh circuit intentionally enables the local power supply to float and allow it to drift to a lower predetermined voltage level prior to the memory array refresh operation.
    • 一种用于SRAM系统的电源管理电路,包括一个或多个隔离存储器阵列,并且在主动操作模式期间实现包括与每个存储器阵列相关联的本地电源的电源和连接到本地电源的外部电源。 电源管理电路包括:开关机构,用于在低功率操作模式期间断开外部电源到每个本地电源; 以及通过在低功率模式期间选择性地将外部电源连接到各个本地电源来实现存储器阵列刷新操作的刷新定时电路。 在低功率模式期间,刷新电路有意地使本地电源浮动并允许其在存储器阵列刷新操作之前漂移到较低的预定电压电平。