Programmable logic device input/output circuit configurable as reference voltage input circuit
    3.
    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。

    Programmable I/O element circuit for high speed logic devices
    8.
    发明授权
    Programmable I/O element circuit for high speed logic devices 失效
    用于高速逻辑器件的可编程I / O元件电路

    公开(公告)号:US06853215B1

    公开(公告)日:2005-02-08

    申请号:US10685355

    申请日:2003-10-09

    摘要: A programmable I/O element for an I/O terminal of a logic array is suitable for operating according to high speed 110 modes such as double data rate and zero bus turnaround. The I/O element may include an input block with two registers for registering input signals from the terminal upon alternate clock edges. In addition or alternatively, it may include an output block with two registers that separately register output signals from the array on the same clock edge and a multiplexer that alternately outputs those signals. For bidirectional terminals, the multiplexer output is connectable to the I/O terminal via an output buffer, and an output enable block provides an enable signal to a gating input of the output buffer. Programmable delays may be included in the input, output, and output enable paths, in particular to provide a slower turn-on time than turn-off time for the output buffer.

    摘要翻译: 用于逻辑阵列的I / O端子的可编程I / O元件适用于根据高速110模式(例如双数据速率和零总线周转)进行操作。 I / O元件可以包括具有两个寄存器的输入块,用于在备用时钟边缘上从终端注册输入信号。 另外或替代地,它可以包括具有两个寄存器的输出块,该两个寄存器在相同的时钟沿上单独地寄存来自阵列的输出信号,以及交替地输出这些信号的多路复用器。 对于双向端子,多路复用器输出可通过输出缓冲器连接到I / O端子,并且输出使能块向输出缓冲器的选通输入提供使能信号。 可编程延迟可以包括在输入,输出和输出使能路径中,特别是提供比输出缓冲器的关断时间更慢的导通时间。