Advanced Micro Devices Inc (AMD)

[SemiconEng]

Semi, thanks for the clarification! Now, are there any examples of wafers where adjoining rows of devices are skewed to better take advantage of edge space on the (roughly) circular disk?

Die are positioned on the wafers to maximize the total number of complete die on a wafer. There may also be a consideration of the time it takes for the Litho Stepper to move to the next row/die. Moving straight down/up to the next complete die on the next row, takes a shorter amount of time than moving straight up/down and also 1/2 stepping over. Also as was previously stated, wafer saw would be much easier/quicker/cheaper with all the die aligned.

I don't know if ofset rows/die on wafers can be done. I haven't personally seen any wafers with offset die row/row. Maybe such wafers exist, but I haven't seen any in my work in the past 10 years.

Semi