1195 - ALDEC Active-HDL: Simulation: How can I make the ALDEC Active-HDL Waveform Viewer zoom in enough to see the details of my simulation?
ALDEC Active-HDL: Simulation: If an Active-HDL Waveform Viewer/Editor won't zoom in enough, the problem is probably in the resolution of the simulation. You check this by selecting from the Active-HDL toolbar Design -> Settings -> Simulation. Look for "Simulator Resolution." You'll see a mode ("Setting") and a current resolution (e.g. "Current: 100 ps"). The current resolution is normally picked up from Verilog simulations by the 'timescale directive.
The higher the resolution is, the less you'll be able to zoom in... So the logical solution is to reduce the resolution.
You can fix this problem in a few ways:
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For Verilog users, the recommended method is to use the `timescale directive. For example, you can replace `timescale 1 ns/1 ns with `timescale 1ns/100 ps (Refer to a Verilog textbook for more information on using the `timescale directive.)
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If you are starting your simulation from the command line you can also change the resolution by using asim/vsim switch options. This is as easy as adding "-t 100 ps" to your "vsim" or "asim" command. For example: "vsim {existing_options}" becomes "vsim {existing_options} -t 100 ps".
- If you are launching the simulation from the ispLEVER GUI, follow these steps:
- Launch ActiveHDL from the ispLEVER GUI.
- The simulation will load and run to completion.
- In the ActiveHDL command window, issue a "restart" command.
- In the ActiveHDL command window, click at the command prompt, then use the up arrow to scroll back through the command history. Keep scrolling until you find the vsim command.
- Modify the vsim command by appending -t option. e.g. "vsim {existing_options}" becomes "vsim {existing_options} -t 100 ps".
- Press Enter to run the simulation again.
- The resolution displayed in the Waveform window should be changed so that you can zoom in closer.