JEDEC Releases New Standard for LPDDR5/5X Serial Presence Detect (SPD) Contenu
JESD406-5 documents the contents of the SPD non-volatile configuration device included on all JEDEC standard memory modules using LPDDR5/5X SDRAMs, including the CAMM2 standard designs outlined in JESD318. The JESD401-5B standard defines the content of standard memory module labels using the other two standards, assisting end users in selecting compatible modules for their applications.
JESD406-5 standard specifies the contents of each SPD byte, allowing application software including BIOSes to determine the module capacity, la vitesse, I/O configuration, and content revision level of the module. Rounding algorithms are defined to optimize performance even when legacy modules are plugged into new systems, or new modules are plugged into legacy systems.
JESD406-5 supports the memory module configurations, known as “raw cards”, as documented in the JESD401-5B specification. CAMM2 Raw card E defines an LPDDR5/5X module usable as one or two ranks of memory organized as eight subchannels, each with x16 I/O interface. Module design is in process and will be available on the JEDEC website once system qualification and standard design approval is completed.
“The release of LPDDR5/5X SPD Contents is an important step in expanding the market for these components, including use in notebook computers. Combined with standards for module base specifications and labels, system designers can be assured of consistent support for incorporating LPDDR5 devices into their systems,” dit Mian Quddus, Chairman of the JEDEC Board of Directors. “With detailed algorithms for using the parameters in the SPDs, end users can be assured of optimal performance.”