Silicon Investor (SI) -- The First Internet Community

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Technology Stocks : Advanced Micro Devices - Moderated (AMD) -- Ignore unavailable to you. Want to Upgrade?

To: dougSF30 who wrote (238315)	8/7/2007 8:19:20 PM
From: Petz	Read Replies (1) \| Respond to of 275872

I have not been corrected. Look what adding cache redundancy did already Redundant rows were built into the Pcache; through laser repair after wafer probe, faulty rows could be replaced. Negative binomial statistics [5] was used to determine the impact of cache redundancy on the chip yield. Without redundancy, the average fault density was estimated to be four times higher in the Pcache than the rest of the chip. It was shown that the nonrepairable fault density in the Pcache decreased to 1.3 times that of the rest of the chip when one redundant row was built for every 16 rows, and to 0.5 times that of the rest of the chip when one row per 8 rows was used. The latter option was selected, and the maximum impact of the Pcache on overall yield is estimated at about 3 % . ieeexplore.ieee.org This was a 100 MHz VAX microprocessor circa 1992. From page 2, the cache looks to be 20% of the chip area. You might also want to look at an old Intel Technology Journal disclosure about Pentium Pro's redundant L2 cache, the I5, which was a separate chip. The Production Results Raster and replacement data indicated that 85% of all die that failed the BIST screen could use redundancy. After the first month in production, an average increase in yield of 35% was evident. Recognize that both of the above are very early examples of cache redundancy. Petz