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    • 21. 发明授权
    • Memory controller for independently supporting Synchronous and
Asynchronous DRAM memories
    • 用于独立支持同步和异步DRAM存储器的存储器控​​制器
    • US5893136A
    • 1999-04-06
    • US956693
    • 1997-10-24
    • Patrick F. StoltThomas J. Holman
    • Patrick F. StoltThomas J. Holman
    • G06F12/00G06F13/00G06F13/16
    • G06F13/1694Y02B60/1228
    • The present invention provides a method and apparatus in a memory controller coupled between a system bus and memory for independently supporting one of a Synchronous DRAM (SDRAM) and an Asynchronous DRAM (ADRAM) memory type via common signal pins. According to the preferred embodiment, the memory controller comprises memory control logic for generating both SDRAM and ADRAM memory interface signals and multiplexing means for selecting as output onto common signal pins either set of interface signals depending upon a memory type setting programmed within a configuration register. The memory control logic comprises at least a request processor in addition to two memory state machines, one for SDRAM and the other for ADRAM memory operations. When a system bus request is received by the request processor, it is assigned to a request state machine which interacts with both the SDRAM state machine and the ADRAM state machine to generate two sets of memory interface signals in addition to two sets of internal control signals. The sets of signals are input to a multiplexor provided for each type of control signals (i.e., memory interface and internal control), which multiplexors are controlled by the memory type select signal output from the configuration register. Based on the memory type setting programmed into the configuration registers, the appropriate sets of memory interface and internal control signals (i.e., either SDRAM or ADRAM) are selected for output to the memory array and to other units of the memory controller, respectively.
    • 本发明提供一种耦合在系统总线和存储器之间的存储器控​​制器中的方法和装置,用于通过公共信号引脚独立地支持同步DRAM(SDRAM)和异步DRAM(ADRAM)存储器类型之一。 根据优选实施例,存储器控制器包括用于产生SDRAM和ADRAM存储器接口信号的存储器控​​制逻辑和用于根据在配置寄存器内编程的存储器类型设置,将共同信号引脚选择为接口信号的集合的多路复用装置。 除了两个存储器状态机之外,存储器控制逻辑至少包括一个请求处理器,一个用于SDRAM,另一个用于ADRAM存储器操作。 当请求处理器接收到系统总线请求时,它被分配给请求状态机,该请求状态机与SDRAM状态机和ADRAM状态机进行交互,以产生两组存储器接口信号,以及两组内部控制信号 。 这些信号组被输入到为每种类型的控制信号(即,存储器接口和内部控制)提供的多路复用器,该多路复用器由从配置寄存器输出的存储器类型选择信号控制。 基于编程到配置寄存器中的存储器类型设置,选择适当的存储器接口组和内部控制信号(即,SDRAM或ADRAM)以输出到存储器阵列和存储器控制器的其他单元。