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    • 3. 发明授权
    • Fast and gate with programmable output polarity
    • 快速和门极可编程输出
    • US4638189A
    • 1987-01-20
    • US626377
    • 1984-06-29
    • George GeannopoulosCyrus TsuiMark FitzpatrickAndy Chan
    • George GeannopoulosCyrus TsuiMark FitzpatrickAndy Chan
    • H03K19/177H03K17/66H03K19/173H03K19/20G06F11/28H03K19/003H03K19/082
    • H03K19/1736H03K17/666
    • The present invention combines in either a logical AND function of N logical input signals, where N is a selected positive integer greater than or equal to 1, and provides programmably, either a direct AND output signal or a NAND output signal. The invention accomplishes this using a minimum number of components in the data path, between the logical input leads and logical output leads. A minimum of components in the data path reduces the propagation delay introduced by the circuit. The invention accomplishes this by providing two AND gates connected to the same set of N logical input signals. The output signal of one AND gate is inverted by an inverter with an enable/disable input lead. The output signal of the other AND gate is inverted twice by two inverters. The second inverter has an enable/disable input lead. Means are provided for exclusively enabling one or the other of the two inverters with an enable/disable input lead. Thus, either the once inverted signal is provided to the output lead or the twice inverted signal is provided to the output lead.
    • 本发明以N逻辑输入信号的逻辑和功能组合,其中N是大于或等于1的选择的正整数,并且可编程地提供直接AND输出信号或NAND输出信号。 本发明使用数据路径中的最小数量的组件,逻辑输入引线和逻辑输出引线之间来实现。 数据路径中的最小组件减少了由电路引入的传播延迟。 本发明通过提供连接到同一组N个逻辑输入信号的两个与门来实现这一点。 一个与门的输出信号由具有使能/禁止输入引线的反相器反相。 另一个与门的输出信号由两个反相器反相两次。 第二个反相器具有使能/禁止输入引线。 提供了用于通过使能/禁止输入引线独占地使能两个逆变器中的一个或另一个的装置。 因此,将一次反相信号提供给输出引线,或将两次反相信号提供给输出引线。