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    • 4. 发明授权
    • Method and software for generating enable and data input signals for flip-flops used for implementing logic functions on programmable logic devices
    • 用于产生用于在可编程逻辑器件上实现逻辑功能的触发器的使能和数据输入信号的方法和软件
    • US07302669B1
    • 2007-11-27
    • US11244648
    • 2005-10-05
    • Peter Kazarian
    • Peter Kazarian
    • G06F17/50
    • G06F17/5054
    • Generating enable and data input signals for flip-flops used for implementing complex logic functions on a programmable logic device. The method includes ascertaining a behavioral logic equation that defines a logic function to be implemented on the programmable logic device, the logic function having one or more inputs and an output. A truth table is then derived from the behavioral logic equation. The truth table includes one or more minterms that collectively define all the possible states of the one or more inputs and the output of the logic function. Positive and negative cofactors of the logic function are defined from the minterms of the truth table. The defined positive and negative cofactors are used to ascertain an enable signal used to enable a flip-flop and logic circuitry to provide to a data input of the flip-flop. Together, the logic circuitry and the enable signal control the operation of the flip-flop to implement the logic function on the programmable logic device. In one embodiment, the aforementioned method is implemented in the programming software used for programming a PLD and maintained on a computer readable medium.
    • 生成用于在可编程逻辑器件上实现复杂逻辑功能的触发器的使能和数据输入信号。 该方法包括确定定义要在可编程逻辑器件上实现的逻辑功能的行为逻辑方程,该逻辑功能具有一个或多个输入和输出。 然后从行为逻辑方程派生真值表。 真值表包括一个或多个minterms,它们共同定义了一个或多个输入的所有可能状态和逻辑功能的输出。 逻辑函数的正和负辅助因子由真值表的最小值定义。 定义的正和负辅助因子用于确定用于使触发器和逻辑电路能够提供给触发器的数据输入的使能信号。 一起,逻辑电路和使能信号控制触发器的操作以在可编程逻辑器件上实现逻辑功能。 在一个实施例中,上述方法在用于编程PLD并保存在计算机可读介质上的编程软件中实现。
    • 5. 发明授权
    • Apparatus for emulating asynchronous clear in memory structure and method for implementing the same
    • 用于模拟异步清除存储器结构的装置及其实现方法
    • US07126858B1
    • 2006-10-24
    • US11156083
    • 2005-06-17
    • Jinyong YuanPeter Kazarian
    • Jinyong YuanPeter Kazarian
    • G11C7/10
    • G11C7/22
    • Circuitry is disclosed for emulating asynchronous clear on each of a read address register of a memory cell and a data output register of a memory cell such that the memory cell can be defined in a memory structure that does not support asynchronous clear capability. The emulation includes defining the memory cell to have a registered read address input and a data output connected to an input of a multiplexer. The register connected to the read address input of the multiplexer does not include an asynchronous clear connection. The data transmitted from the memory cell to the multiplexer is output from the multiplexer when an asynchronous clear signal has not been asserted. However, the multiplexer is further connected to output either null data or a ground signal in lieu of the data transmitted from the memory cell when an asynchronous clear signal has been asserted.
    • 公开了用于在存储器单元的读地址寄存器和存储器单元的数据输出寄存器中的每一个上模拟异步清零的电路,使得可以在不支持异步清除能力的存储器结构中定义存储器单元。 仿真包括定义存储器单元以具有注册的读取地址输入和连接到多路复用器的输入的数据输出。 连接到多路复用器的读地址输入的寄存器不包括异步清除连接。 当异步清除信号尚未被断言时,从存储器单元发送到多路复用器的数据被从复用器输出。 然而,当异步清除信号被断言时,多路复用器进一步连接以输出空数据或接地信号来代替从存储器单元发送的数据。