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Experimental Setup

Experimental Setup. Placed DEF. Cadence QPlace. Placed DEF. Placed DEF. IBM-PLACE2. Capo MetaPlacer. QPlace ECO mode. Cadence WRoute. LEF/DEF. Dragon (Fixed-die). Placed DEF. Benchmarks (IBM-PLACE 2.0).

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Experimental Setup

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  1. Experimental Setup Placed DEF Cadence QPlace Placed DEF Placed DEF IBM-PLACE2 Capo MetaPlacer QPlace ECO mode Cadence WRoute LEF/DEF Dragon (Fixed-die) Placed DEF 1

  2. Benchmarks (IBM-PLACE 2.0) • Converted from ISPD98 partitioning suite, floorplanned by Cadence Silicon Ensemble • New features for IBM-PLACE 2.0: • LEF/DEF and GSRC bookshelf format • Cell sizes are similar with the standard-cells in TSMC 0.18um library (from Artisan Inc.) • Aspect ratio 1.0 (arbitrary number of rows) • No space between rows • Exact pin locations (not center-of-cell) • Over-the-cell routing with 4 or 5 routing layers • Predefined core size with white space 5%-15% • Each circuit corresponds to an easy and a hard instance • Limitations • No clock/power/ground signals • No pin input/output information • No I/O pads connections 2

  3. Place/Route Flow • QPlace • Congestion-driven (default) mode • Capo/MetaPlacer • Default mode • A post-placement step (QPlace ECO mode) is required to correct small displacement problems • Dragon • Fixed-die mode with white space allocation • WRoute • Both global and detailed routing • Reporting final wirelength, number of violations and vias, routing time. • Automatically stopping if the placement is unroutable 3

  4. Details • Input files • QPlace: configuration file, LEF, floorplanned DEF • Capo/MetaPlace: auxiliary file, LEF, floorplanned DEF • Dragon: configuration file, LEF, floorplanned DEF • ECO for Capo/MetaPlace: configuration file, LEF, floorplanned and placed DEF • WRoute: configuration file, LEF, floorplanned and placed DEF • Routing result • Successful without violation • With lots of iterations and a small number of violations • Failed because of too many violations • GSRC bookshelf format • Dragon website will provide the benchmarks for both LEF/DEF and bookshelf format, and the converter from placed bookshelf files to DEF files http://er.cs.ucla.edu/Dragon 4

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