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Politics : Formerly About Advanced Micro Devices

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To: Paul Engel who wrote (28076)	1/23/1998 5:50:00 PM
From: Tony Viola	Read Replies (3) of 1574491

Paul, re: "Perhaps someone else on this thread can add some insight into the test difficulties with newer CPU chips?" I've gotten away from test in the last few years, but last I looked, Teradyne, based in Boston, and Advantest (Japan) were keeping up pretty well with VLSI testing. As you mentioned, BIST has become a necessity. IBM's version is JTAG, and at Amdahl we used "Net Verify" on a recent VLSI based product. In net verify, you use scan to get to a particular gate or latch input, then you clock or pulse it (through scan) and then look for the appropriate gate or latch output to "wiggle". This way, you break down testing even millions of gates worth of logic to millions of different "mini-tests". Keeps the testers (particularly the software!) relatively simple. It worked good! Tony

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