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The Secrets of PC Memory:Part 4
Posted by newsbot on February 10th 2008

For better signal quality at higher speed grades, DDR3 adopts asocalled “Fly-by” architecture for the commands, addresses and clocksignals. This effectively reduced the number of stubs and signallinglength from the DDR2 T-Branch architecture to a more elegant andstraightforward design. The Fly-by topology generally connects the DRAM chips on the memorymodule in a series, and at the end of the linear connection is agrounded termination point that absorbs residual signals, to preventthem from being reflected back along the bus.We recently asked Aaron Boehm, an Application Engineer at Micron abouthow important the Fly-by topology is to DDR3. He said that the Fly-bydesign was “veryimportant in DDR3. Probably one of the biggest advantages of moving tothe Fly-by topology is that we are able to achieve a much faster slewrate for the signal. This gives us a bigger data-eye, which is veryimportant in DRAM.”

View article at bit-tech.net

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