Global Standards for the Microelectronics Industry
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DDR5 SERIAL PRESENCE DETECT (SPD) CONTENTSTerminology update Release Number: Version 1.2
This publication describes the serial presence detect (SPD) values for all DDR5 memory modules. In this context, “modules” applies to memory modules like traditional Dual In-line Memory Modules (DIMMs) or solder-down motherboard applications. The SPD data provides critical information about all modules on the memory channel and is intended to be use by the system's BIOS in order to properly initialize and optimize the system memory channels.
SPD5118 HUB and SERIAL PRESENCE DETECT DEVICE STANDARDRelease Number: Version 1.5.1
This standard defines the specifications of interface parameters, signaling protocols, and features for DDR5 Serial Presence Detect EEPROM with Hub function (SPD5 Hub) and integrated Temperature Sensor (TS) as used for memory module applications. The Hub feature allows isolation of a local bus from a Controller host bus. The designation SPD5118 or generic term SPD5 Hub refers to the devices specified by this standard.