IBM ES/9000 buried engineering change modeling for verificationMCM

摘要

Buried engineering change (BEC) is a method of laying outengineering change (EC) wires within a multichip module (MCM) at theoriginal building time for later use. The authors discuss the modelingused to accurately predict delay, validate electrical integrity, and adda degree of flexibility to the wiring process. The purpose of developingthis BEC modeling methodology was to provide fast, accurate electricalverification and timing without using slower circuit modeling tools onindividual nets. By modeling classes of nets an equivalent model conceptwas developed that provided fast timing and verification of all nets.This modeling methodology centers around maintaining the originalmodeling structure for a net that is physically different whenengineering-changed. The IBM ES/9000 timing and verification toolsaccurately predicted net timing for BEC nets