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    • 2. 发明授权
    • DRAM controller
    • DRAM控制器
    • US5153856A
    • 1992-10-06
    • US660225
    • 1991-02-21
    • Toshiyasu Takahashi
    • Toshiyasu Takahashi
    • G11C11/401G11C11/407G11C11/4096
    • G11C11/407G11C11/4096
    • A DRAM controller comprises an address output controller for transferring an address-designating signal to a dynamic RAM, a data output controller for transferring data to be written into and read-out from a memory region of the dynamic RAM which is designated by the address-designating signal, and a control circuit responsive to a mode-designating signal for generating various control signals corresponding to an access mode of the dynamic RAM designated by the mode-designating signal and for supplying control signals to the dynamic RAM, address output controller, and data output controller in a predetermined sequence. In the DRAM controller, the control circuit includes a signal-generating unit for generating control signals in a specific access mode which requires an access time longer than a machine cycle of a processor for generating the address-designating signal, the data to be written, and the mode-designating signal, the signal-generating means delaying generation control signals every time designation of the specific access mode by the mode-designating signal is repeated.
    • DRAM控制器包括用于将地址指定信号传送到动态RAM的地址输出控制器,用于从由地址指定信号指定的动态RAM的存储器区域中传送要写入和读出的数据的数据输出控制器, 以及响应于模式指定信号的控制电路,用于产生对应于由模式指定信号指定的动态RAM的访问模式的各种控制信号,并且用于向动态RAM,地址输出控制器提供控制信号,以及 数据输出控制器。 在DRAM控制器中,控制电路包括:信号产生单元,用于以特定访问模式生成控制信号,该访问模式需要比用于生成地址指定信号的处理器的机器周期长的访问时间,要写入的数据, 和模式指定信号,每当通过模式指定信号指定特定访问模式时,信号发生装置延迟发生控制信号被重复。