JEDEC releases new standard for LPDDR5/5X SPD contents

JEDEC Solid State Technology Association announced the publication of the JESD406-5 LPDDR5/5X Serial Presence Detect (SPD) Contents V1.0, consistent with the updated contents of JESD401-5B DDR5 DIMM Label and JESD318 DDR5/LPDDR5 Compression Attached Memory Module (CAMM2) Common Standard. To download these and other published JEDEC documents, visit the JEDEC website. 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, speed, 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 interf...