搜搜考试网英语翻译The J-K Flip-Flop.Another problem with the basic R-S fli
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英语翻译
The J-K Flip-Flop.Another problem with the basic R-S flip-flop is the forbidden state at the input.This can be eliminated by ANDing the inputs with the output of the flip-flop,thus blocking one of the inputs,as shown in Fig.4.23.The added gates here have effect of inhibiting the 1 input to the gate whose output is 1.There-fore,the input which is passed will always change the state of the output.Thus the truth table for the J-K flip-flop is the same as the truth table in Fig.4.19,except that we indicate a change of output state for the hitherto forbidden input state.The J-K Flip-Flop thus gives us,in addition to a latched memory of the input,the capacity to “toggle” (A Lever-actuated switch,like the ordinary light on-off switch,is called a toggle switch.Thus to toggle means to switch from one state to another) when both inputs are 1.This toggle feature reveals why we must use edge triggering for this flip-flop; for if the clock pulse were extended in time,the state would oscillate back and forth and the eventual output would be indeterminent.The toggle mode of the J-K flip-flop is useful in counters and frequency dividers.
The J-K Flip-Flop.Another problem with the basic R-S flip-flop is the forbidden state at the input.This can be eliminated by ANDing the inputs with the output of the flip-flop,thus blocking one of the inputs,as shown in Fig.4.23.The added gates here have effect of inhibiting the 1 input to the gate whose output is 1.There-fore,the input which is passed will always change the state of the output.Thus the truth table for the J-K flip-flop is the same as the truth table in Fig.4.19,except that we indicate a change of output state for the hitherto forbidden input state.The J-K Flip-Flop thus gives us,in addition to a latched memory of the input,the capacity to “toggle” (A Lever-actuated switch,like the ordinary light on-off switch,is called a toggle switch.Thus to toggle means to switch from one state to another) when both inputs are 1.This toggle feature reveals why we must use edge triggering for this flip-flop; for if the clock pulse were extended in time,the state would oscillate back and forth and the eventual output would be indeterminent.The toggle mode of the J-K flip-flop is useful in counters and frequency dividers.
j-K型钾触发器.另一个问题是基本的r - s触发器是禁止国家在投入.这可以消除安定的投入与产出的触发器,从而阻碍之一投入所示fig.4.23 .加上盖茨这里有抑制1输入门的输出是1 .有-走在前列的,投入是通过永远改变状态输出.因此真值表为歼钾触发器是相同的真值表在fig.4.19 ,除了表明我们改变输出状态,为迄今禁止输入状态.j型钾触发器,从而给我们,此外还有一个锁存记忆投入,有能力的"触发器" （杠杆启动开关,就像普通灯开关,是一个叫钮开关.从而触发方式开关从一个国家向另一个国家）当两个输入都藤肘特征揭示为什么我们必须利用边缘触发此触发器;如果时钟脉冲延长时间,国家将振荡回来提出并最终产出将indeterminent .肘模式的j钾触发器是有用的柜台和分频器.
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