Wire length prediction based clustering and its application in placement
Proceedings of the 40th annual Design Automation Conference
Vectorless Analysis of Supply Noise Induced Delay Variation
Proceedings of the 2003 IEEE/ACM international conference on Computer-aided design
An efficient and effective detailed placement algorithm
ICCAD '05 Proceedings of the 2005 IEEE/ACM International conference on Computer-aided design
Fast algorithms for IR drop analysis in large power grid
ICCAD '05 Proceedings of the 2005 IEEE/ACM International conference on Computer-aided design
Timing-aware power noise reduction in layout
ICCAD '05 Proceedings of the 2005 IEEE/ACM International conference on Computer-aided design
ACM Transactions on Design Automation of Electronic Systems (TODAES)
Timing-Aware Decoupling Capacitance Allocation in Power Distribution Networks
ASP-DAC '07 Proceedings of the 2007 Asia and South Pacific Design Automation Conference
Efficient placement of distributed on-chip decoupling capacitors in nanoscale ICs
Proceedings of the 2007 IEEE/ACM international conference on Computer-aided design
Electronic Circuit & System Simulation Methods (SRE)
Electronic Circuit & System Simulation Methods (SRE)
Optimal decoupling capacitor sizing and placement for standard-cell layout designs
IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
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Dynamic power noises may not only degrade the circuit performance but also reduce the noise margin which may result in the functional errors in integrated circuit. Decoupling capacitor (decap) allocation is one of the most effective way in reducing serious dynamic power noises (hotspots). To allocate decap before placement, we observed that not only locations but also rising time of functional cells are required to accurately predict power noises. Compared to a previous work which only takes neighborhood relation into consideration, our method is more efficient in reducing hotspots. Furthermore, to reduce the hotspots after placement, instead of only using the empty space as proposed in the previous work, we move out cells in the area with serious power noise area (hot area). The obtained empty space can be used to accommodate decaps to further reduce the hotspots. The experimental result shows, compared to the previous work [1], our estimation function to allocate decap before placement is 23% better in reducing power noises. Moreover, compared to a method which fills decaps to all remaining empty space, our cell move algorithm can almost eliminate all the remaining hot grid nodes and hot cells. In summary, compared to the original circuits (without decap), about 60% of hotspots can be removed using our prediction function before placement, and most of the remaining hotspots are removed by our cell moving step after placement.