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Design Compiler User Guide F-2011.09-SP2
Design Compiler User Guide Version F-2011.09-SP2
Performing Top-Level Design Stitching . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-110
Steps in the Top-Level Design Stitching Flow. . . . . . . . . . . . . . . . . . . . . . . 10-112
Supported Commands, Command Options, and Variables . . . . . . . . . . . . . . . . . . . 10-113
Using the Design Compiler Graphical Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-114
Reducing Routing Congestion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-115
Routing Congestion Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-115
Viewing Congestion With the Design Vision Layout Window . . . . . . . . . . . 10-117
Routing Congestion Reduction Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-118
Predicting, Analyzing, and Minimizing Routing Congestion . . . . . . . . . . . . 10-118
Specifying Congestion Optimization Options . . . . . . . . . . . . . . . . . . . . . . . 10-120
Specifying Block-Level Congestion Optimization . . . . . . . . . . . . . . . . . . . . 10-120
Reporting Congestion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-121
Summary of Routing Congestion Commands . . . . . . . . . . . . . . . . . . . . . . 10-122
Improving Area Correlation and Runtime with Synopsys
Physical Guidance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-123
Physical Guidance Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-123
Specifying Design Constraints and Power Settings . . . . . . . . . . . . . . . . . . 10-126
Using Physical Guidance in Design Compiler (compile_ultra -spg) . . . . . . 10-130
Using the Incremental Flow (compile_ultra -incremental -spg). . . . . . . . . . 10-131
Exporting the Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-133
Using Physical Guidance in IC Compiler (place_opt -spg) . . . . . . . . . . . . . 10-134
Using the Design Compiler and IC Compiler Hierarchical Flow . . . . . . . . . 10-134
Incremental ASCII Flow With a Third-Party DFT Flow Example . . . . . . . . 10-136
Reporting Physical Guidance Information . . . . . . . . . . . . . . . . . . . . . . . . . 10-138
Physical Guidance Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-139
Creating and Modifying Floorplans Using Floorplan Exploration. . . . . . . . . . . . 10-139
Floorplan Exploration Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-139
Enabling Floorplan Exploration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-140
Using the Floorplan Exploration GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-142
Creating and Editing Floorplans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-143
Saving the Floorplan or Discarding Updates . . . . . . . . . . . . . . . . . . . . . . . 10-144
Saving the Floorplan into a Tcl Script File or DEF File. . . . . . . . . . . . . . . . 10-144
Exiting the Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-145
Incremental or Full Synthesis after Floorplan Changes . . . . . . . . . . . . . . . 10-146
Using Floorplan Exploration in Batch Mode . . . . . . . . . . . . . . . . . . . . . . . . 10-146
Handling Black Boxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-148
Handling Interface Logic Models and Physical Hierarchies . . . . . . . . . . . . 10-148
Floorplan Exploration Limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-149
Optimizing Multicorner-Multimode Designs in Design Compiler Graphical . . . . . . . 10-149