发明授权
- 专利标题: Techniques for super fast buffer insertion
- 专利标题(中): 超快速缓冲插入技术
-
申请号: US10996292申请日: 2004-11-22
-
公开(公告)号: US07392493B2公开(公告)日: 2008-06-24
- 发明人: Charles Jay Alpert , Zhuo Li , Stephen Thomas Quay
- 申请人: Charles Jay Alpert , Zhuo Li , Stephen Thomas Quay
- 申请人地址: US NY Armonk
- 专利权人: International Business Machines Corporation
- 当前专利权人: International Business Machines Corporation
- 当前专利权人地址: US NY Armonk
- 代理商 Casimer K. Salys; Jack V. Musgrove
- 主分类号: G06F17/50
- IPC分类号: G06F17/50
摘要:
A method of determining buffer insertion locations in an integrated circuit design establishes candidate locations for inserting buffers into a net, and selects buffer insertion locations from among the candidates based on slew constraints. The selection of buffer insertion locations preferably optimizes slack and buffer cost while keeping slew from any buffered node to any sink less than a required slew rate. The slew analysis computes an output slew SL(v) of a given buffer b inserted at a node v as SL(v)=RS(b)·C(v)+KS(b), where C(v) is the downstream capacitance at v, RS(b) is the slew resistance of buffer b, and KS(b) is the intrinsic slew of buffer b. The delay through a given buffer may also be computed based on signal polarity. However, the invention still preferably uses worst-case slew resistance and intrinsic slew in considering the slew constraints. If the selection of the buffer insertion locations results in no locations being selected due to slew violations, the present invention may advantageously find a partial solution by relaxing the slew constraint.
公开/授权文献
- US20060112364A1 Techniqes for super fast buffer insertion 公开/授权日:2006-05-25