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To: Alan Bell who wrote (29473)	9/14/1999 12:21:00 AM
From: grok	Read Replies (1) \| Respond to of 93625

RE: <KZ, Bill stills consults for one of the technology groups in Palo Alto. I run into him in the cafeteria every so often. He is a very smart guy. It turns out that he really didn't want GTL named after him. But no one could come up with a better name. -- Alan> Yes, I know. He's a very modest guy. I was working with him at the time although not with Xerox.

To: Alan Bell who wrote (29473)	9/14/1999 12:50:00 AM
From: grok	Respond to of 93625

Alan, I attended a DDR presentation and some slides said: PC Applications: PC266 Devices, PC2100 Modules, 1-4 slots, Long traces < 12", Termination, No Dummy modules Small Systems: SS-400 Devices, Direct Connect, 2-8 DDR SDRAMS, Short traces < 2", No termination, Built for speed DDR Signaling: SSTL_2 differential inputs, 2.5V I/O with 1.25V reference voltage, Low voltage swing with termination, Rail to rail if unterminated So I guess that for 8 or fewer DDRs you can go unterminated but if a larger system you got to terminate. I think that the terminatiion method is to provide a series resistor at the source and a pullup at the destination.