Programmable logic device input/output circuit configurable as reference voltage input circuit
    5.
    发明授权
    Programmable logic device input/output circuit configurable as reference voltage input circuit 有权
    可编程逻辑器件输入/输出电路可配置为参考电压输入电路

    公开(公告)号:US06346827B1

    公开(公告)日:2002-02-12

    申请号:US09366937

    申请日:1999-08-04

    IPC分类号: H01L2500

    CPC分类号: G11C5/147 G11C5/066

    摘要: A programmable input/output circuit for a programmable logic device input/output pin can be configured in a standard I/O mode, or in a reference voltage mode. The circuit includes a tristatable, but otherwise standard I/O buffer as well as a reference voltage clamp circuit. In reference voltage mode, the I/O circuit is tristated, and the reference voltage clamp circuit passes a reference voltage from the I/O pin to a reference voltage bus. In standard I/O mode, the I/O buffer is operational. The reference voltage clamp circuit isolates the I/O pin from the reference voltage bus and may include undervoltage and overvoltage protection to prevent disturbance of the reference voltage bus by an out-of-range I/O signal.

    摘要翻译: 可编程逻辑器件输入/输出引脚的可编程输入/输出电路可以在标准I / O模式或参考电压模式下进行配置。 该电路包括可跟踪的标准I / O缓冲器以及参考电压钳位电路。 在参考电压模式下,I / O电路被三态化,参考电压钳位电路将参考电压从I / O引脚传递到参考电压总线。 在标准I / O模式下,I / O缓冲区可以运行。 参考电压钳位电路将I / O引脚与参考电压总线隔离,并可能包括欠压和过压保护,以防止参考电压总线受到超出范围I / O信号的干扰。

    Techniques and circuitry for accurately sampling high frequency data signals input to an integrated circuit
    9.
    发明授权
    Techniques and circuitry for accurately sampling high frequency data signals input to an integrated circuit 有权
    用于精确采样输入到集成电路的高频数据信号的技术和电路

    公开(公告)号:US06292116B1

    公开(公告)日:2001-09-18

    申请号:US09571766

    申请日:2000-05-16

    IPC分类号: H03M900

    摘要: Techniques and circuitry are provided to handle high frequency input data. The techniques and circuitry take a high-frequency serial input data stream and covert it into parallel form for handling within the integrated circuit. The circuitry ensures the high frequency data is strobed properly by accounting for skew between the high frequency data input and clock input. In an implementation, multiple clock strobes are generated having the same frequency but different phase. A predetermined series of bits is input to the high frequency input into the circuitry for training. One of the multiple clock strobes is selected based on which one correctly determines the bits in the predetermined input data stream. This clock strobe is selected to strobe the high frequency data input for the integrated circuit. In an embodiment, the high frequency data input is an LVDS input of a programmable logic integrated circuit.

    摘要翻译: 提供技术和电路来处理高频输入数据。 技术和电路采用高频串行输入数据流,并将其隐藏为并行形式,用于集成电路内的处理。 该电路通过考虑高频数据输入和时钟输入之间的偏斜,确保高频数据正确选通。 在一个实现中,产生具有相同频率但相位相差的多个时钟选通。 将预定的一系列比特输入到用于训练的电路中的高频输入。 基于哪个正确地确定预定输入数据流中的比特来选择多个时钟选通中的一个。 选择该时钟选通脉冲以选通集成电路的高频数据输入。 在一个实施例中,高频数据输入是可编程逻辑集成电路的LVDS输入。