RTL Design Flow - Computation Structures Group

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Another Series of Gordian (a) Global placement with 1 region (b) Global placement with 4 region (c) Final placements Kurt Keutzer D. Pan – U of Texas 29
Physical <strong>Design</strong> <strong>Flow</strong> Input Floorplanning Placement Routing Output ECE 260B – CSE 241A /UCB EECS 244 1 Read Netlist Floorplanning Initial Placement Routing Region Definition Global Routing Cost Estimation Routing Region Ordering Detailed Routing Cost Estimation Compaction/clean-up Write Layout Database Placement Improvement Routing Improvement What are some of your considerations? Courtesy K. Keutzer et al. UCB Kahng/Keutzer/Newton How many levels do my roads need to go? Remember: Higher is more expensive. How do I avoid congestion? What basic structure do I want for my roads? Manhattan? Chicago? Boston? Automated route tools have to solve problems of comparable complexity on every leading edge chip ECE 260B – CSE 241A /UCB EECS 244 3 Kahng/Keutzer/Newton Imagine … You have to plan transportation (i.e. roads and highways) for a new city the size of Chicago Many dwellings need direct roads that can’t be used by anyone else You can affect the layout of houses and neighborhoods but the architects and planners will complain And … you’re told that the time along any path can’t be longer than a fixed amount What are some of your considerations? ECE 260B – CSE 241A /UCB EECS 244 2 Routing Applications Cell-based ECE 260B – CSE 241A /UCB EECS 244 4 Mixed Cell and Block Kahng/Keutzer/Newton Block-based Kahng/Keutzer/Newton
Page 1 and 2: VLSI CAD Flow: Logic Synthesis, Pla
Page 3 and 4: Algebraic vs. Boolean Methods Algeb
Page 5 and 6: Tech.-Dependent Optimization LIBRAR
Page 7 and 8: DAG Covering Sound Algorithmic appr
Page 9 and 10: RTL Design Flow Library/ module gen
Page 11 and 12: Modeling the Net’s Wire Length (x
Page 13 and 14: Layout after Min-cut Now global pla
Page 15: Final Placement - 1 Earlier steps h
Page 19: Graph Search Steiner Iterative ECE

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