Hi all; A memory designer rejects RDRAM, DDR, chooses SDRAM for Intel processor:
Comparing emerging RAM technologies
EET Asia, July 2001
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As Jeff Holt, the lead hardware designer, explained it, the new device requires memory delivered at 100MHz. This would be fast enough to guarantee that the predictions would appear in the blink of an eye. An analysis of the data structures put their RAM requirements at around 32MB. A lot of memory in a small, relatively inexpensive product led them to conclude that some sort of DRAM was certainly going to be the choice.
SDRAM rated at both 100MHz and 133MHz is available off the shelf. That puts the DDR SDRAM at 200MHz and 266MHz. As mentioned above, Rambus DRAM is significantly faster than that; you can buy 400MHz and 800MHz RDRAM. Being good designers, my team doesn't over design, thus SDRAM was deemed the best fit. Furthermore, the processor they had chosen, the Intel Strong ARM, provides the control signals needed to use SDRAM. Unfortunately, it supports neither DDR SDRAM nor Rambus.
Given that its speed was acceptably fast, its price was the lowest of the three, and our processor required no extra control chip, the choice of SDRAMA was a no-brainer.
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eetasia.com
-- Carl |
