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To: Bilow who wrote (81404)	3/6/2002 10:11:51 AM
From: John Walliker	Read Replies (1) \| Respond to of 93625

Carl, none of it has anything to do with volume manufacturing, of memory systems So what? I never claimed to be a designer of high-volume memory systems. The sad fact is that to the extent you're a designer, you're a designer of Rolls Royces (or military tanks). Sad? Yes, I prefer to work on high-end systems because I find it more interesting. A classic disagreement we had was over the question of whether it was possible to use DDR without the termination resistors. Yes, but the example I worked through was for a heavily loaded bus where the answers are different. I totally agree that termination resistors are not needed when the interconnection is short enough that transmission-line effects are not important. I have used very short unterminated interconnects between DSPs and fast SRAMs without problems in the past. That is not the same as a PC bus with three or four memory modules. (Remember Alan Bell? #reply-11221475 ). I'd love to hear an explanation, especially given that industry has now firmly come down on DDR for notebooks. I think the only way that both of you could have gotten the same wrong result is that you were sitting next to each other. As it happens, we have never met. P.S. Re: "Now why don't you tell us a little about yourself?" This is somewhat odd, given that you also wrote: "... you are not going to provoke me into disclosing the companies I consult for, nor the details of the products involved." Well, you are quite happy to trawl through my old postings to try and build a picture of my experience which you think will prove that I am incompetent to comment on electronic engineering. I don't hide behind a pseudonym. I am willing to disclose my qualifications and where they came from. I don't disclose the identity of clients because of the need to maintain confidentiality and I don't disclose the exact nature of the products I work on because that would enable you to deduce the identity of the clients. Why don't you tell us who you are and where you obtained your engineering qualifications? John