Emmc Cid Decoder

The eMMC Card Identification (CID) register is a 128-bit, JEDEC-standardized register containing critical metadata—such as manufacturer ID, product name, and manufacturing date—essential for identifying device authenticity. Data is typically retrieved on Linux via sysfs and decoded using tools to parse the 32-character hex string for engineering or forensic analysis. A commonly used online tool is available at MultiCID Decoder. sdmmc eMMC Decode CID properly - NXP Community

The eMMC CID Decoder is an essential utility for developers and hardware enthusiasts working with embedded storage. It translates the raw 128-bit hexadecimal string stored in an eMMC's Card Identification (CID) register into human-readable data like the manufacturer name, serial number, and production date. Why Decode the CID? emmc cid decoder

Product Revision (PRV): A 1-byte value showing the hardware and firmware revision levels. The eMMC Card Identification (CID) register is a

Decoding involves extracting the raw hex string and mapping it to the fields above. Linux Systems Represent CID as 128-bit big-endian integer or as

The CID is a 128-bit (16-byte) register stored in every eMMC device according to the JEDEC standard (JESD84). This register is written during the manufacturing process and is read-only for the end-user. It cannot be changed or erased, making it a perfect unique identifier.

4. Decoding algorithm (concept)

1. Represent CID as 128-bit big-endian integer or as 16 bytes in transmission order.
2. Extract fields by bit slicing according to layout above. Example bit offsets (MSB=bit127 → LSB=bit0):