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To: John Walliker who wrote (104008)	6/5/2000 3:11:00 PM
From: Elmer	Respond to of 186894

Re: "They must use very wide manufacturing guardbands then. Each bit is transmitted over a period of 1250ps, so 40ps is a very small percentage (3%) of the bit period" Yes but what are the setup and hold specs? Those are the ones that must meet "spec". It's not enough to simply issue data at 800MHz. That's not such a big deal but if you have a 200ps setup spec and your test accuracy is 80ps per channel, that's 80ps for the signal plus 80ps for the clock. You've got 160ps inaccuracy on a 200ps spec. Not practical in a production environment. BTW, these accuracies are for a perfect system, just calibrated and perfectly clean. How accurate do you think they would be on a test floor after running 10,000 RDRAMs through it? EP