JEDEC Announces Annual Serial Presence Detect Enhancements

ARLINGTON, Va., USA – AUGUST 16, 2016 –  JEDEC Solid State Technology Association, the global leader in standards development for the microelectronics industry, has announced that its JC-45 Committee has approved the 2016 annual release of codes for the Serial Presence Detect (SPD) for DDR4/DDR4E and for LPDDR3/LPDDR4.  The SPD is an EEPROM present on all JEDEC standard memory modules that contains codes read by the host computer to determine critical functions and timing supported by the memory module.  SPD4.1.2.L-4 (for DDR4/DDR4E) and  SPD4.1.2.M-2 (for LPDDR3/LPDDR4) are both available for free download from the JEDEC website.

“Embedded SPD codes in solder down applications have also become exceptionally popular in computing devices,” said Mian Quddus, Chairman of the JC-45 Committee on DRAM Modules.  “This annual release of new SPD codes helps the industry keep abreast of the latest DRAM advances while maintaining backward compatibility.”

The 2016 release of the DDR4 SPD Contents specification includes support for second generation Registered modules and Load Reduced modules, with increases in operation speed to 3200 Mbps through addition of Decision Feedback Equalization control bytes.  The SPD revision level remains unchanged for UDIMMs at revision 1.1, however revision levels for other modules types have increased: RDIMM and LRDIMM module SPD revisions increase to revision 1.2 and the revision for NVDIMMs increases to revision 1.1.

The 2016 release of the LPDDR3/LPDDR4 SPD Contents also changes the revision levels to 1.1 with the addition of support for a greater number of channels for high capacity, high throughput systems.


JEDEC is the global leader in the development of standards for the microelectronics industry. Thousands of volunteers representing nearly 300 member companies work together in 50 JEDEC committees to meet the needs of every segment of the industry, manufacturers and consumers alike. The publications and standards generated by JEDEC committees are accepted throughout the world.  All JEDEC standards are available for free download from the JEDEC website. For more information, visit



Emily Desjardins
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