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    • 3. 发明公开
    • Operation mode setting circuit for DRAM
    • DRAM的操作模式设置电路
    • EP0328110A3
    • 1991-10-09
    • EP89102251.9
    • 1989-02-09
    • KABUSHIKI KAISHA TOSHIBAToshiba Micro-Computer Engineering Corporation
    • Toda, HarukiOhshima, ShigeoIkawa, Tatsuo
    • G11C11/24G11C11/406
    • G11C11/406G11C7/1045G11C11/4076
    • A signal ( WE ) externally supplied to determine operation mode is supplied to a first buffer circuit (13). A CAS signal is supplied to a second buffer cir­cuit (14). The signals whose levels are converted by the first and second buffer circuits (13 and 14) are supplied to a mode selection circuit (15). The opera­tion of the mode selection circuit (15) is controlled by a RAS signal, and it latches and outputs a mode selection signal based on the outputs of the first and second buffer circuits (13 and 14). An externally supplied address signal and an address signal formed in the device are supplied to address buffer circuit (16). The address buffer circuit (16) selects one of the received address signals based on the RAS signal and the mode selection signal output from the mode selection circuit (15). A selected one of the address signals is supplied to a word line selection/driving circuit (17). When a mode other than the auto-refresh mode is speci­fied, the mode setting signal ( WE ) is set up before the RAS signal is activated. The set-up allowance time (t S ) with respect to the activation timing of the RAS signal is set to be larger than the minimum value (t ASRmin ) of the set-up allowance time (t ASR ) of the external address signal. The mode setting signal ( WE ) is latched by the mode selection circuit (15) when the RAS signal is acti­vated. The latched signal is used to select and control the operation mode.
    • 5. 发明公开
    • Operation mode setting circuit for DRAM
    • Schaltung zur Einstellung des BetriebsmodusfürDRAM-Speicher。
    • EP0328110A2
    • 1989-08-16
    • EP89102251.9
    • 1989-02-09
    • KABUSHIKI KAISHA TOSHIBAToshiba Micro-Computer Engineering Corporation
    • Toda, HarukiOhshima, ShigeoIkawa, Tatsuo
    • G11C11/24G11C11/406
    • G11C11/406G11C7/1045G11C11/4076
    • A signal ( WE ) externally supplied to determine operation mode is supplied to a first buffer circuit (13). A CAS signal is supplied to a second buffer cir­cuit (14). The signals whose levels are converted by the first and second buffer circuits (13 and 14) are supplied to a mode selection circuit (15). The opera­tion of the mode selection circuit (15) is controlled by a RAS signal, and it latches and outputs a mode selection signal based on the outputs of the first and second buffer circuits (13 and 14). An externally supplied address signal and an address signal formed in the device are supplied to address buffer circuit (16). The address buffer circuit (16) selects one of the received address signals based on the RAS signal and the mode selection signal output from the mode selection circuit (15). A selected one of the address signals is supplied to a word line selection/driving circuit (17). When a mode other than the auto-refresh mode is speci­fied, the mode setting signal ( WE ) is set up before the RAS signal is activated. The set-up allowance time (t S ) with respect to the activation timing of the RAS signal is set to be larger than the minimum value (t ASRmin ) of the set-up allowance time (t ASR ) of the external address signal. The mode setting signal ( WE ) is latched by the mode selection circuit (15) when the RAS signal is acti­vated. The latched signal is used to select and control the operation mode.
    • 外部提供的用于确定操作模式的信号(WE)被提供给第一缓冲电路(13)。 CAS信号被提供给第二缓冲电路(14)。 其电平由第一和第二缓冲电路(13和14)转换的信号被提供给模式选择电路(15)。 模式选择电路(15)的操作由RAS信号控制,并且基于第一和第二缓冲电路(13和14)的输出锁存和输出模式选择信号。 外部提供的地址信号和在设备中形成的地址信号被提供给地址缓冲电路(16)。 地址缓冲电路(16)基于RAS信号和从模式选择电路(15)输出的模式选择信号,选择接收的地址信号之一。 所选择的一个地址信号被提供给字线选择/驱动电路(17)。 当指定了自动刷新模式以外的模式时,模式设置信号(WE)在激活RAS信号之前建立。 相对于RAS信号的激活定时的设定容许时间(tS)被设定为大于外部地址信号的设定容许时间(tASR)的最小值(tASRmin)。 当RAS信号被激活时,模式设置信号(WE)被模式选择电路(15)锁存。 锁存信号用于选择和控制操作模式。
    • 6. 发明公开
    • Semiconductor memory device
    • 半导体存储器件
    • EP0788107A3
    • 1999-06-02
    • EP97101347.9
    • 1997-01-29
    • KABUSHIKI KAISHA TOSHIBA
    • Kai, YasuyukiNagaba, KatsushiOhshima, Shigeo
    • G11C7/00
    • G11C7/1048G11C7/1078
    • A semiconductor memory device capable of shortening data reading time in a first read cycle after the mode has been changed from a write mode to a read mode while maintaining high-speed cycle time when data is written despite simple structure, the semiconductor memory device having a memory cell array (11) having a plurality of dynamic memory cells, to which data can be written, data line pairs (DQ0, BDQ0 to DQN, BDQN) to which data read from the memory cells and data which must be written on the memory cells are transferred, a write driver (17) for driving the data line pairs in accordance with write data supplied from outside when data is written to the memory cells and an equalizing circuit (18) for setting the data line pairs to an intermediate potential whenever the data line pairs are operated by the write driver.
    • 本发明公开了一种半导体存储装置,该半导体存储装置能够缩短从写入模式向读取模式变更模式后的第一读取周期的数据读取时间,并且即使简单地构成写入数据也能够维持高速的周期时间, 具有可向其写入数据的多个动态存储单元的存储单元阵列(11),从存储单元读取数据的数据线对(DQ0,BDQ0至DQN,BDQN)以及必须写入存储单元的数据 当数据被写入存储器单元时,用于驱动数据线对的写入驱动器(17)根据外部提供的写入数据来驱动数据线对,以及均衡电路(18),用于无论何时将数据线对设置为中间电位 数据线对由写入驱动器操作。