User`s manual

Simulating with the graphic interface
7-204 ModelSim XE Graphic Interface ModelSim Xilinx User’s Manual
a library name. You can also use the Browse button to locate a library among
your directories. Make certain your selection is a valid ModelSim library - it
must include an _info file and must have been created from ModelSim’s vlib
command
(CR-140). Once the library is selected you can view its design units
within the Design Unit list box.
• Simulate (<configuration> | <module> | <entity> [(<architecture>)])
Specifies the design unit(s) to simulate. You can simulate several Verilog top-
level modules or a VHDL top-level design unit in one of three ways:
1. Type a design unit name (configuration, module, or entity) into the field,
separate additional names with a space. Specify library/design units with the
following syntax:
[<library_name>.]<design_unit>
2. Click on a name in the Design Unit list below and click the Add button.
3. Leave this field blank and click on a name in the Design Unit list (single unit
only).
• Design Unit/Description
This hierarchal list allows you to select one top-level entity or configuration to
be simulated. All entities and configurations that exist in the specified library
are displayed in the list box. Architectures may be viewed by selecting the "+"
box before any name.
Simulator time units may be expressed as any of the following:
See also, "Selecting the time resolution"
(4-46).
Simulation time units
1fs, 10fs, or 100fs femtoseconds
1ps, 10ps, or 100ps picoseconds
1ns, 10ns, or 100ns nanoseconds
1us, 10us, or 100us microseconds
1ms, 10ms, or 100ms milliseconds
1sec, 10sec, or 100sec seconds