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Politics : Formerly About Advanced Micro Devices

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To: James Yegerlehner who wrote (25065)	10/19/1997 12:38:00 AM
From: Yousef	of 1576826

Jim, Re: "Does anyone know how many parallel lines AMD can have at fab 25 ... Thanks for any insights." I would be happy to give you my estimates ... As posted on the other AMD thread, Fab25 has 86,700 sqft of cleanroom space. In that space, one should be able to get at least 30 (8") steppers and "other supporting" Fab equipment. The majority of these steppers will be I-line machines capable of either .35um or .25um production. Probably about 5 of these will be DUV steppers/scanners that are needed for the "critical layers" in a .25um process. Thus for both .35um and .25um, there will be redundant equipment to help keep cycletime (outdate-indate of wafers) down and capacity up. I expect that AMD will be able to build all the CPU's you mentioned in this Fab. That's the "good news" ... now for the limitations. Using a Fab for both generations of process creates some "special" challenges for AMD. They have to bring up the .25um process on equipment running .35um production. This is always difficult because to solve process problems, one must run experiments, maybe modify equipment ... so it is hard to do both jobs (process turn-on and manufacturing) well. Also as chip demands change, new equipment for .25um will need to be brought in and old equipment "retired". This "juggling" of equipment and capacity by process type can lead to missing deliveries on either .35um or .25um. Both of these mentioned issues also make it hard to troubleshoot and fix yield problems. Hope this helps. Make It So, Yousef

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