User guide

6-29
VPD and EVCD File Generation
+vpdnostrengths to Not Store Strength Information
By default, VPD stores strength information on value changes to the
VPD file. You can disable this feature by supplying the
+vpdnostrengths command line option. Use of this option may
lead to slight improvements in VCS performance.
Syntax:
+vpdnostrengths
VPD Methodology
The following information explains how to manage the DVE and VPD
functions and how to to optimize simulation and analysis.
Advantages of Separating Simulation From Analysis
Traditionally, interactive debugging has required a user to occupy
one VCS license while simulating, thinking, resimulating, thinking...
Simulating once and efficiently storing as much data as possible
allows for a more efficient debug methodology that has the following
features:
• VCS is used once and then released to other users.
• The analysis tool can go both forwards and backwards in time
and analyze the complete set of data.
• The same set of data can be used by multiple users to debug one
or more problems in parallel.