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Application Notes
Overview
With an ever-growing demand to go faster and use less power within a reduced footprint, double data rate (DDR) memory technology has evolved significantly in the past five years.
DDR4 is the fourth-generation of double data rate SDRAM memory. DDR4 enables significantly higher bandwidth for data transfer than DDR3 and offers evolutionary improvements in speed, density and power over previous generation memory. These advances subsequently promote higher performance and energy efficiency for enterprise, micro-server, and tablet applications—allowing designers to build devices with smaller chip footprints, that consume less power, and generate less heat.
DDR4 memory architecture combines key features of DDR3 (bidirectional DQS) and a data bus similar to GDDR5 (CRC and data error detection capability). But DDR4 signals do exhibit a few significant behavioral differences from previous-generation DDR solutions. These key differences are driving the creation of a new testing methodology.
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