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Serial Presence Detect FAQs

Serial Presence Detect(6)
Can I verify that the hexadecimal SPD values are correct?
Converting the hexadecimal value to binary and then matching it against the associated SPD byte in the appropriate JEDEC SPD specification will provide a translation of what the byte is for and how it is set.
How are SPD values determined?
Micron utilizes a proprietary application that generates SPD values for each part number based on engineer’s input and a database of rules. The rules housed within the database are carefully written to ensure that JEDEC SPD specifications are adhered to. This process ensures compatibility and consistency.
What are the JEDEC SPD specifications?
The SPD specifications for modules are determined by JEDEC. Micron uses several SPD specifications within JEDEC Standard No. 21-C to determine and generate SPD data for SDRAM, DDR, DDR2, DDR3 and FBDIMM modules. These specifications are available (if ratified) to the public at www.jedec.org. Specifications that have not yet been completed or ratified are available to JEDEC members only.
What is the acronym SPD stand for?
Serial Presence Detect
What is the SPD data used for?
The SPD data represents different electrical and physical characteristics of the module. This data is permanently stored in an electrically erasable programmable read-only memory (EEPROM) on the module. A basic input/output system (BIOS) access SPD information through the SMBus. The system BIOS can then use this data to configure the system to optimize the memory that has been installed.
What is the SPD table for?
The SPD table shows the hexadecimal values for each byte that is held in the EEPROM on each memory module.