An On-Line Scheduler for ASIC Manufacturing Line Management

Tadao TAKEDA  Satoshi TAZAWA  Kou WADA  Eisuke ARAI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E78-C   No.3   pp.241-247
Publication Date: 1995/03/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Sub-1/4 Micron Device and Process Technologies)
Category: 
Keyword: 
scheduler,  ASIC,  TAT,  algorithm,  

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Summary: 
An on-line scheduler for ASIC manufacturing line management has been developed. The parameters in the schedule models and the dynamic priority curve in the schedule algorithm were adjusted to obtain schedules well-suited to practical ASIC line management and control. The scheduler is connected to the user interface control module of our ASIC CIM system. In order to facilitate on-line scheduling, we clarify the performance requirements of the computer used for the scheduler with respect to the line scale. Using a current EWS, the scheduler can easily make a one-day schedule for a small-scale line with an annual throughput of less than 1,000 lots within 10 minutes. To cope with larger-scale lines, the multiple scheduling method allows schedules to be produced quickly and efficiently. Therefore, the scheduler can respond flexibly to changes in production plan and line resources and the control delivery date of each lot.