Advanced Micro Devices - Moderated (AMD) Message Board

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Technology Stocks : Advanced Micro Devices - Moderated (AMD)

AMD 209.43

+0.9%

3:45 PM EST

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To: Bill Jackson who wrote (73457)	3/6/2002 1:39:30 AM
From: Ali Chen	Read Replies (1) of 275872

Bill, "..but can you quantify that?" [9 layers of Hammer] According to classics, "Computer Architecture, a Quantative Approach" by J.Hennessy and D.Patterson, page 12-13, Die yield = Wafer yield x (1 + Defect per area x Die area /N)^-N , where N is "roughly the number of masking levels". In 1995, the good N was 3. Substituting "Defect per area" = 0.5 /cm2, Die = 1 cm2, and N=6, the yield in this model is 61.86%, while for N=9 it gives 61.47%. So, draw your own conclusion regarding impact of extra metal layers on Hammer yields. I wonder what is the function of BS vs. FUD amongst our friends, paid stooges? - Ali

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