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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: Mani1 who wrote (82289)	12/7/1999 10:30:00 PM
From: Elmer	Read Replies (1) \| Respond to of 1576600

Re: "Elmer, are you sure that there is thermal testing done for every chip after manufacturing it? " I cannot speak for every company's test methodology but I can tell you that if you want to ship sub 500DPM then it must be done for every device in the standard production test flow. Not every company ships sub 500DPM however I believe AMD's quality standards are near if not equal to Intel's. It is time consuming as wave integrators require ~500ms to do their thing but it also serves as a fault screen and no large company (Intel, AMD, IBM, Moto, TI, etc) would leave it out. EP

To: Mani1 who wrote (82289)	12/7/1999 10:41:00 PM
From: Bill Jackson	Read Replies (2) \| Respond to of 1576600

Mani, Thermal testing done for all after making them? I think they will test the current versus voltage at assorted speeds and use that to compare to a prior database of detailed tests. You would need to package them to run a full thermal test and at 50% yield half the packages would be wasted. They will get to know where on the die the good ones come from as well as the bad ones due to systematic errors and they will also find the random dirt errors. All this will be used to try to make a better yield of faster parts by slight line adjustments. They will have a sea of data to analyze and will know what parts are good before they package them. Packaging will introduce a few faults and so there will be final tests. If yu are making 20 million parts and you have 500 test jigs running 24/7 that is 12 minutes each for a test at flat out no rest. If the test take 1 second they can get by with 1 jig and have some down time. We need some input here to say what is the Intel/AMD test procedure and how long does it take at what stage in the process. Obviously the long slow tests will be put on the passing candidates...no sense wasting them on bad parts. Bill