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    • 5. 发明授权
    • Programmable input/output buffer circuit with test capability
    • 具有测试能力的可编程输入/输出缓冲电路
    • US5671234A
    • 1997-09-23
    • US78692
    • 1993-06-17
    • Christopher E. PhillipsMichael G. AhrensJoseph G. Nolan, IIILaurence H. Cooke
    • Christopher E. PhillipsMichael G. AhrensJoseph G. Nolan, IIILaurence H. Cooke
    • G01R31/28H01L21/66H01L21/82H03K17/693H03K19/00H03K19/003H03K19/0185H03K19/173
    • H03K17/693H03K19/00361H03K19/018585
    • An integrated circuit having system logic with programmable elements, decoding logic coupled to the programmable elements for addressing the programmable elements and a plurality of input/output buffer circuits for passing signals between the system logic and the exterior of the integrated circuit through input/output terminals is disclosed. Each input/output buffer circuit comprises an output driver stage having an output terminal connected to an input/output terminal; and a plurality of cells, each cell having a multiplexer, a flip-flop connected to an output terminal of the first multiplexer for storing a signal from the first multiplexer, a latch connected to an output terminal of the flip-flop for storing a signal from the flip-flop, and a second multiplexer connected to an output terminal of the latch. The cells connected to each other and cells of other input/output buffer circuits from an output terminal of the flip-flop of one cell to a first input terminal of a first multiplexer of another cell for serial scanning of signals through the cells to test the system logic. Control lines are connected to the output terminals of the latch of the cells and to the decoding logic coupled to the programmable elements so that the programmable elements can be addressed for programming by serially scanning control signals through the cells.
    • 具有可编程元件的系统逻辑的集成电路,耦合到可编程元件的解码逻辑,用于寻址可编程元件;以及多个输入/输出缓冲电路,用于通过输入/输出端子在集成电路的系统逻辑与外部之间传递信号 被披露。 每个输入/输出缓冲电路包括具有连接到输入/输出端子的输出端的输出驱动级; 多个单元,每个单元具有多路复用器,连接到第一多路复用器的输出端的触发器,用于存储来自第一多路复用器的信号;连接到触发器的输出端的锁存器,用于存储信号 以及连接到锁存器的输出端的第二多路复用器。 这些单元彼此连接,其它输入/输出缓冲电路的单元从一个单元的触发器的输出端子连接到另一个单元的第一多路复用器的第一输入端,用于通过单元串行扫描信号,以测试 系统逻辑。 控制线连接到单元的锁存器的输出端子和耦合到可编程元件的解码逻辑,使得可编程元件可以通过串行扫描通过单元的控制信号进行编程。
    • 7. 发明授权
    • Programmable input/output buffer circuit with test capability
    • 具有测试能力的可编程输入/输出缓冲电路
    • US5221865A
    • 1993-06-22
    • US718677
    • 1991-06-21
    • Christopher E. PhillipsMichael G. AhrensJoseph G. Nolan, IIILaurence H. Cooke
    • Christopher E. PhillipsMichael G. AhrensJoseph G. Nolan, IIILaurence H. Cooke
    • G01R31/28H01L21/66H01L21/82H03K17/693H03K19/00H03K19/003H03K19/0185H03K19/173
    • H03K17/693H03K19/00361H03K19/018585
    • An integrated circuit having system logic with programmable elements, decoding logic coupled to the programmable elements for addressing the programmable elements and a plurality of input/output buffer circuits for passing signals between the system logic and the exterior of the integrated circuit through input/output terminals is disclosed. Each input/output buffer circuit comprises an output driver stage having an output terminal connected to an input/output terminal; and a plurality of cells, each cell having a multiplexer, a flip-flop connected to an output terminal of the first multiplexer for storing a signal from the first multiplexer, a latch connected to an output terminal of the first storing means for storing a signal from the first storing means, and a second multiplexer connected to an output terminal of the latch. The cells connected to each other and cells of other input/output buffer circuits from an output terminal of the flip-flop of one cell to a first input terminal of a first multiplexer of another cell for serial scanning of signals through the cells to test the system logic. Control lines are connected to the output terminals of the latch of the cells and to the decoding logic coupled to the programmable elements so that the programmable elements can be addressed for programming by serially scanning control signals through the cells.
    • 具有可编程元件的系统逻辑的集成电路,耦合到可编程元件的解码逻辑,用于寻址可编程元件;以及多个输入/输出缓冲电路,用于通过输入/输出端子在集成电路的系统逻辑与外部之间传递信号 被披露。 每个输入/输出缓冲电路包括具有连接到输入/输出端子的输出端的输出驱动级; 以及多个单元,每个单元具有多路复用器,连接到第一多路复用器的输出端的触发器,用于存储来自第一多路复用器的信号;锁存器,连接到第一存储装置的输出端,用于存储信号 以及连接到所述锁存器的输出端的第二多路复用器。 这些单元彼此连接,其它输入/输出缓冲电路的单元从一个单元的触发器的输出端子连接到另一个单元的第一多路复用器的第一输入端,用于通过单元串行扫描信号,以测试 系统逻辑。 控制线连接到单元的锁存器的输出端子和耦合到可编程元件的解码逻辑,使得可编程元件可以通过串行扫描通过单元的控制信号进行编程。
    • 10. 发明授权
    • Multiplexer with level shift capabilities
    • 具有电平转换功能的多路复用器
    • US5534798A
    • 1996-07-09
    • US467340
    • 1995-06-06
    • Christopher E. PhillipsMichael G. AhrensJoseph G. Nolan, IIILaurence H. Cooke
    • Christopher E. PhillipsMichael G. AhrensJoseph G. Nolan, IIILaurence H. Cooke
    • G01R31/28H01L21/66H01L21/82H03K17/693H03K19/00H03K19/003H03K19/0185H03K19/173H03K19/084H03K19/094
    • H03K17/693H03K19/00361H03K19/018585
    • An integrated circuit having system logic with programmable elements, decoding logic coupled to the programmable elements for addressing the programmable elements and a plurality of input/output buffer circuits for passing signals between the system logic and the exterior of the integrated circuit through input/output terminals is disclosed. Each input/output buffer circuit comprises an output driver stage having an output terminal connected to an input/output terminal; and a plurality of cells, each cell having a multiplexer, a flip-flop connected to an output terminal of the first multiplexer for storing a signal from the first multiplexer, a latch connected to an output terminal of the flip-flop for storing a signal from the flip-flop, and a second multiplexer connected to an output terminal of the latch. The cells connected to each other and cells of other input/output buffer circuits from an output terminal of the flip-flop of one cell to a first input terminal of a first multiplexer of another cell for serial scanning of signals through the cells to test the system logic. Control lines are connected to the output terminals of the latch of the cells and to the decoding logic coupled to the programmable elements so that the programmable elements can be addressed for programming by serially scanning control signals through the cells.
    • 具有可编程元件的系统逻辑的集成电路,耦合到可编程元件的解码逻辑,用于寻址可编程元件;以及多个输入/输出缓冲电路,用于通过输入/输出端子在集成电路的系统逻辑与外部之间传递信号 被披露。 每个输入/输出缓冲电路包括具有连接到输入/输出端子的输出端的输出驱动级; 多个单元,每个单元具有多路复用器,连接到第一多路复用器的输出端的触发器,用于存储来自第一多路复用器的信号;连接到触发器的输出端的锁存器,用于存储信号 以及连接到锁存器的输出端的第二多路复用器。 这些单元彼此连接,其它输入/输出缓冲电路的单元从一个单元的触发器的输出端子连接到另一个单元的第一多路复用器的第一输入端,用于通过单元串行扫描信号,以测试 系统逻辑。 控制线连接到单元的锁存器的输出端子和耦合到可编程元件的解码逻辑,使得可编程元件可以通过串行扫描通过单元的控制信号进行编程。