Starting with DDR5, according to the JEDEC specification, an additional chip, the SPD HUB, is added to the memory.
In DDR4 and earlier memory, devices that require external access (SPD, Temperature Sensor) are usually directly connected to the board (directly connected to the SOC controller). With DDR5, more devices are integrated into the memory, and direct connection would make the system too complex. Therefore, DDR5 memory introduced the SPD HUB.
This blog introduces how to Testing DDR5 SPD HUB based on Tower I3C Host Adapter：
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