Flip-flop

Flip-flop (触发器)

触发器(英语:Flip-flop, FF),中国大陆译作“触发器”、台湾及香港译作“正反器”,是一种有两种稳态的用于储存组件,可记录二进位制数字信号“1”和“0”。

触发器可以分成几种常见的类型: SR(设置-重置,"set-reset"), D(数据或延迟,"data" or "delay"), T(反转,"toggle"),和 JK。

RS触发器

基本RS触发器又称SR锁存器,是触发器中最简单的一种。

S:0,0,1,1R:0,1,0,1Qnext:Q,0,1,xx means 不允许\begin{align*} &S: &0, 0, 1, 1 \\ &R: &0, 1, 0, 1 \\ &Q_{next}: &Q, 0, 1, x \\ \\ &\text{x means 不允许} \end{align*}

Anyway, if you use computer, these things doesn't matter.

Rules

R: reset

S: set

正常情况,RSR、S

set=1 , reset=0 , Qn+1=1set=0 , reset=1 , Qn+1=0\begin{align*} set = 1 \text{ , } reset = 0 \text{ , } Q^{n + 1} = 1 \\ \\ set = 0 \text{ , } reset = 1 \text{ , } Q^{n + 1} = 0 \end{align*}

非正常情况,RˉSˉ\bar{R}、\bar{S}

set=0 , reset=1 , Qn+1=1set=1 , reset=0 , Qn+1=0\begin{align*} set = 0 \text{ , } reset = 1 \text{ , } Q^{n + 1} = 1 \\ \\ set = 1` \text{ , } reset = 0 \text{ , } Q^{n + 1} = 0 \end{align*}

CP(clock pulse):

当其为高电平时才检测 RS、D or JK 的电平值

J = set

K = reset

T = 1 ,反相

T = 0 ,保持

D = 0 , 0

D = 1 , 1

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