User guide

2-34
Modeling Your Design
For example:
assign out = $random();
initial
begin
assign dr1 = $random();
force dr2 = $random();
dr3 = $random(in);
These statements do not generate the warning message.
You can tell VCS not to display the warning message by using the
+warn=noRWSI compile-time argument and option.
Designing With $lsi_dumpports for Simulation and Test
This section is intended to provide guidance when using
$lsi_dumpports with Automatic Test Pattern Generation (ATPG)
tools. ATPG tools many times strictly follow port direction and do not
allow unidirectional ports to be driven from within the device. If you
are not careful while writing the test fixture, the results of
$lsi_dumpports causes problems for ATPG tools.
Note:
See “Signal Value/Strength Codes” on page 2-38. These are
based on the TSSI Standard Events Format State Character set.