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To: pheilman_ who wrote (72222)	5/8/2001 8:24:15 AM
From: gnuman	Respond to of 93625

I would say a current source is an excellent academic solution. It can also be lower power. Practical/pragmatic engineers know the extreme difficulty of troubleshooting a current bus. Consider that all the parts are BGA and the traces are controlled impedance, it is near impossible to instrument the bus to find out what is going on. It requires a current probe and a sensing loop. The three RIMM bus on the i820 is probably a good example of your point.<g> But at the same time the RDRAM solution providers seem to have gone to extreme lengths to make sure the various system components are reproducible. And when the engineers finally got a stable design, indications are they've been successful. Yes, at high speeds, a current source is better, but the bus and the transactions better be dead simple or it will take a whole lot of time to get it to work. I don't think DRDRAM transactions qualify as dead simple, so it is not surprising that few, make that just one company is willing to take on the task. It appears it did take a long time to get it to work. <g> I wasn't arguing the merits of one solution over another. Just that once someone made the decision to go the RDRAM route, (for whatever reasons), the design decisions appear to be the right ones. I've predicted that RDRAM, DDR and SDRAM will coexist for a long time. How they split market share will be determined by the market. Cost/performance will probably be the main differentiator. (Along with marketing hype). JMO's