JEDEC Releases New LPDDR5/5X SPD Content Standard

TapTechNews August 23rd news, yesterday (August 22nd), the JEDEC Solid State Technology Association released an announcement, announcing the JESD406-5 LPDDR5/5X Serial Presence Detect (SPD) Content V1.0 standard, which is consistent with the updated content of the existing JESD401-5 BDDR5 DIMM Label and the common standard of the JESD318 DDR5/LPDDR5 Compressed Additional Memory Module (CAMM2).

TapTechNews note: Serial Presence Detect (SPD, serialpresencedetect) is the information stored on the electrically erasable programmable read-only memory (EEPROM) chip in the synchronous dynamic random access memory (SDRAM) memory module, which tells the basic input/output system (BIOS) the size, data width, speed, and voltage of the module.

The JESD406-5 LPDDR5/5X Serial Presence Detect (SPD) Content V1.0 standard records the use of content including SPD non-volatile configuration devices on all LPDDR5/5X SDRAM JEDEC standard memory modules, including the CAMM2 standard design outlined in JESD318.

The JESD406-5 standard stipulates the content of each SPD byte, enabling application software including BIOS to determine the capacity, speed, I/O configuration, and content revision level of the module.

This standard defines the Rounding algorithm, which can optimize performance even when an old module is inserted into a new system or a new module is inserted into an old system.

The JESD406-5 supports memory module configuration, that is, the raw cards recorded in the JESD401-5B specification.

The CAMM2 raw card E defines an LPDDR5/5X module that can be used as one or two levels of memory and is divided into eight sub-channels, each with an x16 I/O interface.