: AC and DC interface parameters, switching timings, and test loading definitions. Physical Specifications
: The standard includes specifications for auto-refresh and self-refresh modes, which are critical for maintaining data integrity without the need for external intervention. jesd79-4d pdf
While JESD79-4D (DDR4) remains widely used, it has been largely superseded in flagship performance by the JESD79-5 (DDR5) standard. ddr4 sdram jesd79-4 - JEDEC STANDARD : AC and DC interface parameters, switching timings,
: Details command truth tables, initialization sequences, and power-down modes. Device Features : AC and DC interface parameters