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02-Quartus-II时序优化策略.pdf


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02-Quartus-II时序优化策略.pdf
文档介绍:
Quartus II Software Design
Series : Optimization
Optimization Techniques –
Timing Optimization


© 2009 Altera Corporation
1
TimingTiming OptimizationOptimization

 General Recommendations
 Analyzing Timing Failures
 Solving Typical Timing Failures


© 2009 Altera Corporation
Altera, Stratix, Arria, Cyclone, MAX, HardCopy, Nios, Quartus, and MegaCore are trademarks of Altera Corporation
2
GeneralGeneral RecommendationsRecommendations

 Clocks
 I/O
 Asynchronous Control Signals


 Many of these suggestions are found in Timing
Optimization Advisor & Quartus II Handbook


© 2009 Altera Corporation
Altera, Stratix, Arria, Cyclone, MAX, HardCopy, Nios, Quartus, and MegaCore are trademarks of Altera Corporation
3
ClocksClocks

 Optimize for Speed
− Apply globally
− Apply hierarchically
− Apply to specific clock domain
 Enable netlist optimizations
 Enable physical synthesis


© 2009 Altera Corporation
Altera, Stratix, Arria, Cyclone, MAX, HardCopy, Nios, Quartus, and MegaCore are trademarks of Altera Corporation
4
GlobalGlobal SpeedSpeed OptimizationOptimization

 Select speed
− Default is balanced
− Area-optimized designs may also show speed improvements
 May result in increased logic resource usage


© 2009 Altera Corporation
Altera, Stratix, Arria, Cyclone, MAX, HardCopy, Nios, Quartus, and MegaCore are trademarks of Altera Corporation
5
IndividualIndividual OptimizationOptimization

 Optimization Technique logic option
− Use Assignment Editor or Tcl to apply to hierarchical block

 Speed Optimization Technique for Clock
Domains logic option
− Use Assignment Editor or Tcl to apply to clock domain or
between clock domains


© 2009 Altera Corporation
Altera, Stratix, Arria, Cyclone, MAX, HardCopy, Nios, Quartus, and MegaCore are trademar
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