Managing WIP and cycle time with the help of loop control

Le résumé fourni par la source

As an adaptation of the CONWIP concept, AMD has de-veloped a heuristic approach to control the WIP in its wa-fer fabrication facilities (fabs). The so called “Loop Con-trol ” concept helps to utilize the installed equipment in an efficient way and reduces the overall cycle time. Two dy-namic constraints (the WIP-Limit and the THP-Limit) are defined to limit the WIP (work in progress) per photo layer and to tackle high WIP situations at individual operations inside a photo layer. Loop Control has been evaluated with help of a fab simulation study prior to implementation in the fab dispatching system. Since its development three years ago, this system operates successfully in the AMD Dresden fabs. 1

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