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Technology Stocks : Advanced Micro Devices - Moderated (AMD)
AMD 214.11+3.9%Nov 26 3:59 PM EST
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To: hammerfall_prophet who wrote (201392)6/9/2006 10:54:00 PM
From: misenRead Replies (1) of 275872
 
What I was trying to say is that during ramp up of a fab, not all the equipment has been acquired and installed. A typical fab has multiple parallel lines of production, and while the first line is ramping to full production, a second one is undergoing adjustments, a third is being built, while others may be at the infrastructure set up stage. I'm probably oversimplifying, but more or less... Once a fab reaches full ramp-up, slowing it down to 50% is a lot more expensive than the same fab when it was ramping up through 50%.

I've seen similar messages many times on this and other boards but have never previously replied.

Typical fabs do not have any such thing as a "line". Typical fabs have a process flow that has multiple hundreds of process steps. Groups of similar or identical tools are used at the individual process steps. Almost every lot processed in a typical fab would have a unique combination of tools at each processing step. AMD's APM may make common combinations more likely but even with APM, the overwhelming number of lots would have different combinations.

When fabs are ramped, new tools are added to the pool of qualified tools for each process step. There is not the addition of a discrete "line".

Misen
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