一文解释时序图

Timing diagrams are the main key in understanding digital systems. Timing diagrams explain digital circuitry functioning during time flow. Timing diagrams help to understand how digital circuits or sub circuits should work or fit in to larger circuit system. So learning how to read Timing diagrams
may increase your work with digital systems and integrate them.

时序图是理解数字电路的关键，时序图通过时间的流动解释了数字电路的功能。时序图对于理解数字电路、子电路是如何运行或兼容更大的数字电路系统有推波助澜的作用。所以学会如何读懂数字电路会帮助你使用并整合数字系统。

Bellow is a list of most commonly used timing diagram fragments:

接下来就介绍一些常用的时序图：

• Low level to supply voltage:（低电平->高电平）
  

• Transition to low or high level:（低电平->高电平 or 高电平->低电平）
  

• Bus signals parallel signals transitioning from one level to other:
  

• High Impedance state:（高阻抗状态–不接收电流信号的状态）
  

• Bus signal with floating impedance:
  

• Conditional change of on signal depending on another signal transition:
  

• Transition on a signal causes state changes in a BUS:
  

• More than one transition causes changes in a BUS:
  

• Sequential transition one signal transition causes another signal transition and second signal transition causes third signal transition.
  

As you see timing diagrams together with digital circuit can completely describe the circuits
working. To understand the timing diagrams, you should follow all symbols and transitions in
timing diagrams.

正如以上所见电路里的时序图完全可以描述电路的运转，如果要理解时序图，你就得记住这些符号和变化图。

You can find plenty of symbols in timing diagrams. It depends actually on designer or circuit
manufacturer. But once you understand the whole picture, you can easy read any timing diagram
like in this example

你会在时序图里发现很多符号，这实际上是由设计者和制造电路的人决定。不过一旦你理解了这篇文章，那你就可以轻而易举地读懂任意的时序图了。

Sometimes you don’t even need to read a documentation in order to understand how one or another circuit work. You just look at Timing diagram and its all clear.

有时候你都不用读操作手册就能知道其他的电路是怎么运作的。只要看看时序图，就一目了然了