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Old 16th August, 2010, 04:08 PM
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Gizmo Gizmo is offline
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DDR simply specifies the interface speed and type, not the memory type. The fact that up to this point DDR has been used in conjunction with SDRAM is just a historical coincidence (and matter of convenience). Technically, I could interface a hard drive to the system using the DDR signalling scheme if I really wanted to.

Up to this point (AFAIK), flash memory has used a parallel bus signaling scheme (set an address on the address pins, read the data out 8 bits or 16 bits at a time on the data pins). This scheme is the way pretty much all memory operated 30 years ago. Modern hardware uses some type of serial signaling scheme (SPI, DDR) because it can be driven faster and is easier to route signals for.
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