Patent ID: 6983191
Filing Date: 2006-01-03
Classification: H01L

Abstract:
1. An availability evaluating system for obtaining an availability of a semiconductor manufacturing line in which it is virtually assumed that a unit group having one or more tool units are serially connected in time series according to a processing event, the system comprising: a first unit configured to calculate an incidence probability Xi (i=1 to k) in combination by applying a probability of tool operation and a probability of tool stoppage to all combinations “k” in which at least a line fabrication availability is not zero, of the combinations of operation and stoppage of tools each configuring the semiconductor manufacturing line and by obtaining a product of the probabilities of all the tools; and a second unit configured to, when a product between an incidence probability Xi of a combination and a fabrication availability Yi of the combination is defined as a probability converted fabrication availability with respect to each of the combinations, calculate as a line availability a value of Q=Σ