Advanced Micro Devices - Moderated (AMD) Message Board

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Technology Stocks : Advanced Micro Devices - Moderated (AMD)

AMD 221.06

-1.1%

Jan 5 3:59 PM EST

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To: misen who wrote (219190)	12/5/2006 11:57:24 PM
From: Elmer Phud	Read Replies (2) of 275872

Misen, Nice to see someone talks my language:) You may argue with the assumptions above, but the assumptions are close enough to reality that the example represents real behavior. Yes it does. Let us remember that these are models and their usefulness is in predicting yield. Based on the assumptions you've listed, if you know the defect density for a process based on a current product or other process monitor, you can use the poisson or murphy's model to predict the yield on another new product for which you have no data. If your process is defect limited as you stated, then it does an excellent job of predicting yield on a die of any size. That's why we can say that if we know the defect density and Company X has a fab capacity of Y wafers and a die size of Z, then they should be able to produce n Good die per unit period of time. Question for you. What do you consider world class defect density? I have been saying it's .25/cm2. What is your opinion?

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