On-Chip Thermal Gradient Analysis and Temperature Flattening for SoC Design

Takashi SATO  Junji ICHIMIYA  Nobuto ONO  Koutaro HACHIYA  Masanori HASHIMOTO  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E88-A   No.12   pp.3382-3389
Publication Date: 2005/12/01
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
Category: Prediction and Analysis
Keyword: 
thermal simulation,  thermal gradient,  temperature flattening,  clock skew,  reliability,  timing,  

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Summary: 
This paper quantitatively analyzes thermal gradient of SoC and proposes a thermal flattening procedure. First, the impact of dominant parameters, such as area occupancy of memory/logic block, power density, and floorplan on thermal gradient are studied quantitatively. Temperature difference is also evaluated from timing and reliability standpoints. Important results obtained here are 1) the maximum temperature difference increases with higher memory area occupancy and 2) the difference is very floorplan sensitive. Then, we propose a procedure to amend thermal gradient. A slight floorplan modification using the proposed procedure improves on-chip thermal gradient significantly.