Clocked Set-Reset Flip-flop时钟 置位复位 边沿触发器
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When the signal line S goes high, the other line to the NAND gate from the pulse steering circuit must also be high for it to generate a low output. Likewise, a clock pulse must have the reset NAND gate high to receive a high RESET pulse. Therefore all transitions are synchronized to the clock. 当信号线S变高时,从脉冲选择电路到NAND门的另一条线路也必须变高,以便该门产生低电平输出。同样,时钟脉冲必须使复位NAND门处于高电平,以便接收高电平的复位脉冲。因此,所有转换都同步于时钟。
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Pulse-Steering Circuit脉冲定向电路
In order to add clock synchronization to a flip-flop, a ciruit is used to apply the clock pulses to the flip-flop. To convert a NAND gate latch to a clocked S/R flip-flop, two NAND gates may be used as above left to enable an input pulse on either the S or R lines to trigger a transition. 为了给触发器添加时钟同步功能,会使用一个电路将时钟脉冲施加到触发器上。要将一个NAND门锁存器转换为时钟控制的S/R触发器,可以如上左图所示使用两个NAND门,以使在S或R线上施加一个输入脉冲以触发状态变化。
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Resetting the NAND Latch复位NAND锁存器
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