对于工程师而言，画时序图，一般用Visio，下载可在网上百度下
或者采用TimeGen，http://www.xfusionsoftware.com/
TimeGen - Timing Diagram Software
Create Timing Diagrams the Easy Way!
还有另外一种方法，可以使用WaveDrom
Hitchhiker's Guide to the WaveDrom
WaveDrom is a JavaScript application. WaveJSON is a format that describes Digital Timing Diagrams. WaveDrom renders the diagrams directly inside the browser. Element "signal" is an array of WaveLanes. Each WaveLane has two mandatory fields:"name" and "wave".
