The structures are similar but not identical. Both use a 128-bit CID register, but the field definitions and manufacturer ID registries differ. Always ensure you‘re using the correct specification for your device type.
CID: 15010053454d453247e3a42a080078df MID: 0x15 CBX: 0x01 (BGA) OID: 0x00 PNM: SEME2G PRV: 0x08 (0.8) PSN: 0xe3a42a08 (3819587080) MDT: 0x00 (Not specified)
There are several free online tools where you simply paste the string and hit "Decode." emmc cid decoder
Converts complex hex strings into readable manufacturer names, dates, and models instantly.
Just provide the CID string and I'll do the decoding for you! eMMC Flash Chips Explained - NexPCB The structures are similar but not identical
Decoding the CID is essential for several advanced tasks:
The open-source community has created numerous Python scripts for CID decoding. These are especially valuable for automation or embedded system integration. These are especially valuable for automation or embedded
| Register | Width | Primary Purpose | |----------|-------|-----------------| | | 128 bits | Device identification (manufacturer, product name, serial number) | | CSD | 128 bits | Device-specific data (capacity, transfer speed, timing) | | EXT_CSD | 512 bytes | Extended device properties (boot partitions, trim support, health) | | OCR | 32 bits | Operating conditions (voltage range, bus mode) |
The 128 bits are divided into 16 bytes (BE). The JESD84-B51 standard defines the following fields:
Provides a permanent hardware fingerprint that cannot be easily spoofed by software, assisting in device chain-of-custody.