External Memory Interface Handbook Volume 1: Intel® FPGA Memory Solution Introduction and Design Flow: For UniPHY-based Device Families
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3.1. DDR SDRAM Features
The desktop computing market has positioned DDR SDRAM as a mainstream commodity product, which means this memory is very low-cost. DDR SDRAM is also high-density and low-power. Relative to other high-speed memories, DDR SDRAM has higher latency-they have a multiplexed address bus, which reduces the pin count (minimizing cost) at the expense of a longer and more complex bus cycle.