Technical specification for Samsung DDR4 SDRAM covering architecture, timing, command operation and calibration details.
This document provides a detailed description of Samsung DDR4 SDRAM, including its functional architecture, command set, timing parameters, and various operating modes such as DLL‑off, write‑leveling, and temperature‑controlled refresh. It also defines the mode registers, CRC, data‑mask, and on‑die termination features required for proper integration.
The specification includes power‑up and reset initialization procedures, voltage and reference‑level requirements, as well as detailed timing diagrams for read, write, refresh, and power‑down operations. It serves as a reference for hardware designers and validation engineers working with Samsung DDR4 memory devices.