Specifications

CHAPTER 5: PLACE & ROUTE
OPTIMIZING THE FIT
ALTERA CORPORATION INTRODUCTION TO QUARTUS II ■ 101
Setting Physical Synthesis Optimization Options
The Quartus II software allows you to set options for performing physical
synthesis to optimize the netlist during fitting. You specify physical
synthesis optimization options in the Physical Synthesis Optimizations
page under Fitter Settings in the Settings dialog box (Assignments menu).
Physical synthesis optimization options include the following options:
■ Perform physical synthesis for combinational logic
■ Physical synthesis for registers:
– Perform register duplication
– Perform register retiming
■ Physical synthesis effort:
– Normal (default effort level; average of 2 to 3 compile times
– Extra (more compile time than Normal; should improve
performance gains)
– Fast (less compile time than Normal; may reduce performance
gains)
For more information about physical synthesis options, refer to “Using
Netlist Optimizations to Achieve Timing Closure” on page 167 in Chapter 9,
“Timing Closure.”
Setting Individual Logic Options that Affect Fitting
Quartus II logic options allow you to set attributes without editing the
source code. You can specify Quartus II logic options for individual nodes
and entities in the Assignment Editor (Assignments menu) and can specify
global default logic options in More Fitter Settings dialog box, which is
available by clicking More Settings in the Fitter Settings page of the
Settings dialog box (Assignments menu). For example, you can use logic
f
For Information About Refer To
Using Quartus II physical synthesis
optimizations
“Netlist Optimizations & Physical Synthesis”
in the Quartus II Handbook, vol.2, on the
Altera web site
Using Quartus II Fitter optimization
options
“Using Physical Synthesis” in Quartus II
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