发明名称 Generating pattern-based estimated RC data with analysis of route information
摘要 A method and apparatus for improving physical synthesis of a circuit design is described. In one exemplary embodiment, post-route information of nets in the circuit design is analyzed. The post-route information includes, for each of the nets, a predicted route property, a post-route property, and a set of physical and/or timing attributes for that net. For each of the attributes, a set of attribute ranges is derived for the corresponding attribute to bin the nets into a Gaussian distribution for that attribute. Net routing constraints are generated for the circuit design based on the attribute ranges derived. The net routing constraints are applied to one or more of the nets during subsequent placement-based optimizations of the circuit design.
申请公布号 US8875075(B2) 申请公布日期 2014.10.28
申请号 US201213528807 申请日期 2012.06.20
申请人 Synopsys, Inc. 发明人 Kennedy Christopher;Qiao Changge
分类号 G06F17/50 主分类号 G06F17/50
代理机构 HIPLegal LLP 代理人 HIPLegal LLP ;Szepesi Judith A.
主权项 1. A method for improving physical synthesis of a circuit design, the method comprising: analyzing, by a data processing system, post-route information of nets in the circuit design, wherein the post-route information includes, for each of the nets in the circuit design, a predicted route property, a post-route property, and a physical attribute for the net; categorizing the nets in the circuit design into a plurality of net patterns by statistically analyzing the physical attribute; determining a scaling factor for a net pattern by computing an average of scaling factors for a plurality of nets matching the net pattern based on the predicted route property and the post-route property, wherein a scaling factor for each net of the plurality of nets is a ratio of the post-route property to the predicted route property for the net; and applying the scaling factor for the net pattern to nets matching the net pattern during placement-based optimizations of the circuit design.
地址 Mountain View CA US