NCSIM中如何显示波形中的glitch

新嘴小王安子

如题，使用ncsim仿真产生shm波形，verilog代码中有一段产生reset的逻辑，然后这个逻辑又会被自身的这个复位信号给复位掉。波形上看不出来
请问有没有什么指令能够在波形上显示出这个glitch

我dumpfsdb波形，然后加+fsdb+glitch=0可以在波形上显示出有个glitch

A1985

You can dump event based waveforms. This will help in catching any glitches that might be generated from within the design.

To dump the delta events you need to use the following TCL commands:

ncsim> database -open waves -shm -default -event
ncsim> probe -create -shm -all -depth all

You can issue the above commands at the ncsim TCL console BEFORE running the simulation/sending signals to waveform window or you can put them in a file called input.tcl and provide this file to irun/ncverilog with -input option.

> irun -input input.tcl <other options>

To expand the time sequence:

    Go to the "Simvision Waveform WIndow"
    Go to "View" menu
    Go to "Expand Sequence Time"
    Go to "All Time"

新嘴小王安子

   

A1985 发表于 2020-7-9 18:47
You can dump event based waveforms. This will help in catching any glitches that might be generated  ...

ADD -EVENT in probe.tcl ,it  worked ,TKS

thjan65

verilog code 在可疑的地方加入 event 指令. 多少可以幫助.

新嘴小王安子

   

thjan65 发表于 2020-11-21 18:19
verilog code 在可疑的地方加入 event 指令. 多少可以幫助.

类似与->event, 然后触发一个打印，帮助debug？

thjan65

參考這裡
https://www.asic-world.com/systemverilog/sema_mail_events3.html

新嘴小王安子

   

thjan65 发表于 2020-11-25 20:54
參考這裡
https://www.asic-world.com/systemverilog/sema_mail_events3.html

好的，谢谢