Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

A method of employing timing-independent coupling-aware abstract assertions for noise analysis

IP.com Disclosure Number: IPCOM000203524D
Publication Date: 2011-Jan-27
Document File: 1 page(s) / 26K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is method of employing timing-independent coupling-aware abstract assertions for noise analysis. The invention is a model for PI/PO assertion independent coupled timing abstraction which ensures the correctness of the hierarchical timing while maintaining a level of accuracy with the timing results.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 78% of the total text.

Page 01 of 1

A method of employing timing-independent coupling-aware abstract assertions for noise analysis

Due to the increased effect of coupling (capacitive and inductive) effects in timing behavior of Very Large-Scale Integration (VLSI) circuits, coupled timing analysis (timing analysis in the presence of capacitive/inductive coupled nets) is generally performed to verify the timing correctness of VLSI chips before validating the chips for manufacturing. In addition, due to the increased complexity of today's VLSI designs, timing hierarchy (abstraction) is widely used to reduce the central processing unit (CPU) time and improve the memory usage during timing and/or synthesis of very large integrated circuits design.

The main problem with the current methodology is that the timing abstraction models, which are generated after the coupling run, are input and output assertion dependent. The timing results under coupling results are affected by the arrival and transition times of the voltage signal at the primary input (PI) of the macro design and/or the required arrival times and the loaded connected at the primary output (PO) of the macro design. Therefore, in order to run coupling analysis at top level, analysts need the PI/PO assertions.

The disclosed invention is a PI/PO assertion independent coupled timing abstraction model which ensures the correctness of the hierarchical timing at the top level while not adding too much pessimism to the timing results. The goal is to...