Transcription of TN-46-05 GENERAL DDR SDRAM FUNCTIONALITY …
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TN-46-05 GENERAL DDR SDRAM FUNCTIONALITY …
1 GENERAL DDR SDRAM FunctionalityMicron Technology, Inc., reserves the right to change products or specifications without Rev. A; Pub. 7/01 2001, Micron Technology, DDR SDRAM FUNCTIONALITYGENERAL DDR SDRAMFUNCTIONALITYINTRODUCTIONThe migration from single data rate synchronousDRAM (SDR) to double data rate synchronous DRAM(DDR) memory is upon us. Although there are manysimilarities, DDR technology also provides notableproduct GENERAL , double data rate memory providessource-synchronous data capture at a rate of twice theclock frequency. Therefore, a DDR266 device with aclock frequency of 133 MHz has a peak data transferrate of 266 Mb/s or GB/s for a x64 DIMM. This isaccomplished by utilizing a 2n-prefetch architecturewhere the internal data bus is twice the width of theexternal data bus and data capture occurs twice perclock cycle. To provide high-speed signal integrity, theDDR SDRAM utilizes a bidirectional data strobe,SSTL_2 interface with differential inputs and objective of this technical note is to provide anoverview of the 2n-prefetch architecture, a strobe-baseddata bus, and the SSTL_2 interface used with DDRSDRAM.
overview of the 2 n-prefetch architecture, a strobe-based data bus, and the SSTL_2 interface used with DDR SDRAM. It will also highlight the functional differences between SDR and the improved DDR memory technol-ogy. For detailed design and timing criteria for DDR ... DON’T CARE (to DRAM) DON'T CARE (to controller) NOTES: 1.
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