: DDR SDRAMs are designed to operate at high speeds, making them suitable for applications requiring rapid data transfer, such as computing systems, networking equipment, and some consumer electronics.
The official is available through the JEDEC Standards Store . While some historical versions or summaries were previously free, JEDEC currently charges for non-member access to certain select standards to cover production costs. Evolution of the Standard JEDEC JESD79-4D - Accuris Standards Store jesd79-4d pdf
: Features an 8n-bit prefetch architecture and utilizes Bank Groups (two or four selectable groups) to improve bandwidth and access speed. : DDR SDRAMs are designed to operate at
: A power-saving feature that reduces the number of simultaneously switching outputs. Evolution of the Standard JEDEC JESD79-4D - Accuris
Why is this interesting? Because during that refresh cycle, the RAM cannot talk to the CPU. It is busy rewriting itself to avoid death. The standard spends dozens of pages defining "Auto-Refresh," "Self-Refresh," and "Fine Granularity Refresh." It’s essentially a manual for how to keep a patient on life support while simultaneously doing open-heart surgery.