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The first generation of Synchronous DRAM (SDRAM) is SDR, which stands for Single Data Rate SDRAM. SDR can transfer only one instruction per clock cycle, which limits the speed and efficiency of data transfer. Double Data Rate SDRAM (DDR-SDRAM) is the new version of SDRAM in which data transfer is possible through both the clock edges (rising and falling edge), making it twice as fast as SDR SDRAM. Data transfer on both the clock edges is common in all generations of DDR, but each new generation brings features that make them technically very different.

Given below is a figure showing SDR vs DDR data transfer per clock.

Figure.1 SDR vs DDR data transfer

As SoCs are getting more complex with the addition of more cores and functionality, low power and high performance become vital goals. DDR SDRAMs meet these memory requirements by offering high-performance, greater-density, and low-power memory solutions. DDR has improved over the years as the industry has progressed from DDR to DDR2, DDR3, DDR4, and now DDR5 SDRAM.

DDR5 is the latest and fifth generation of DDR SDRAM. This standard is able to achieve a higher data transfer rate (speed), more bandwidth, reduced operating voltage, and better efficiency. DDR5 maintains the same pin configuration as its predecessor DDR4, unlike the last transition from DDR3 to DDR4 in which the DDR3 module uses 240 pins and DDR4 uses 288 pins.

Let us see, “Why DDR5 is becoming the preferred choice?”.

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