Specifications

CHAPTER 8: TIMING ANALYSIS
PERFORMING TIMING ANALYSIS IN THE QUARTUS II SOFTWARE
148 ■ INTRODUCTION TO QUARTUS II ALTERA CORPORATION
■ Time group assignments: advanced timing assignments that you can
define in the Time Groups dialog box (Assignments menu); you can
also use the Tcl API in the Quartus II Tcl Console, or one of the
Quartus II executables that support Tcl. Members of a defined time
group can include regular node names, wildcards, and/or other time
group names. Conversely, you can exclude specific nodes, wildcards,
and/or other time group names from a time group. The groups can
then be used in the From or To field of most timing assignments.
Performing a Timing Analysis
Once you have specified timing settings and assignments, you can run the
Timing Analyzer by performing a full compilation.
After compilation is complete, you can rerun timing analysis separately by
using the Start > Start Timing Analyzer command (Processing menu), run
a timing analysis with fast timing models by choosing Start > Start Timing
Analyzer (Fast Timing Model) (Processing menu), or use the Timing
Analyzer Tool command (Tools menu).
You can also generate data for an early timing estimate before fitting is
complete by using the Start > Start Early Timing Estimate command
(Processing menu). See “Performing an Early Timing Estimate” on page 150
for more information.
The Timing Analyzer Tool window provides an alternative interface for
controlling the Timing Analyzer. This interface is similar to the Timing
Analyzer interface in the MAX+PLUS II software. You can use the Timing
Analyzer Tool window to start and stop the Timing Analyzer, quickly view
summary timing analysis results, or to access detailed timing analysis
results in the Compilation Report. You can click List Paths to display
propagation delays for the selected path. See Figure 3.