Placement expanding autolayout router
作者:
H.K.E.Liesenberg,
D.J.Kinniment,
期刊:
IEE Proceedings I (Solid-State and Electron Devices)
(IET Available online 1986)
卷期:
Volume 133,
issue 2
页码: 55-60
年代: 1986
DOI:10.1049/ip-i-1.1986.0013
出版商: IEE
数据来源: IET
摘要:
An automatic channel router for integrated circuits is presented. It operates, as is commonplace with this kind of router, in two stages: the global router is based on a relative placement of subcell instances and it is executed only once during the layout generation process of a specific cell. The detailed router, however, operates in an iterative mode. Initially, the subcell instances are placed as close as possible, in accordance with the given relative placement specification. This absolute placement is then gradually expanded until the channels become properly dimensioned so as to hold all the connections allocated to them at the preceding global routing stage. The expansion is driven by feedback information at the end of each iteration about the failures to route connections in the currently available space.
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