Identifies the silicon vendor (e.g., Samsung, Micron, SK Hynix).
Convert each byte to its ASCII equivalent: 4d = M 4d = M 43 = C 31 = 1 36 = 6 47 = G Result: MMC16G (Indicates a Samsung 16GB eMMC module). 4. Product Revision (PRV) Hex Byte: 01
Unscrupulous suppliers sometimes re-mark older, lower-capacity, or degraded chips with laser engraving to look like premium, high-capacity storage. A CID decoder reads the internal register directly from the silicon. If the internal data does not match the external laser-etched markings, the chip is counterfeit. How to Read a CID String from a Device
Ever wondered exactly which eMMC chip is soldered to your single-board computer, smartphone, or embedded device? You can’t just run lshw or look at a sticker. But there’s a hidden fingerprint inside every eMMC: the . emmc cid decoder
An eMMC (Embedded MultiMediaCard) CID (Card Identification) register is a 128-bit raw hexadecimal string. It contains crucial manufacturing data, including the manufacturer ID, product name, revision number, and production date. Decoding this register is essential for reverse engineering, data recovery, firmware repair, and verifying the authenticity of storage chips.
The CID is a 128-bit read-only register programmed into the eMMC during manufacturing. It contains unique data like:
This is a legacy issue. Older MMC specifications (v3.31 and earlier) used 16 bits for the OEMID, while modern eMMC specifications correctly define it as an 8-bit field. Recent kernel patches have corrected this parsing behavior. Identifies the silicon vendor (e
: Many Android devices use the eMMC CID as a hardware identifier for DRM, bootloader unlocking verification, and device-specific software provisioning. Modifying the CID is typically blocked at the production level, though some tools claim to reprogram CID on certain Samsung eMMC devices.
chip. It serves as a permanent digital fingerprint, containing manufacturing details crucial for device security, firmware validation, and hardware repair. Prodigy Technovations 1. CID Register Structure According to the JEDEC JESD84-B51
The ability to interpret this data is more than a technical curiosity; it has significant practical applications: Product Revision (PRV) Hex Byte: 01 Unscrupulous suppliers
Just provide the CID string and I'll do the decoding for you! eMMC Flash Chips Explained - NexPCB
It reads the specific bits designated for the month and year, translating them into a calendar format like July 2015 . Practical Applications of CID Decoding 1. Mobile and Embedded Device Repair
The eMMC CID register is a crucial piece of metadata that holds the key to identifying and verifying storage hardware. Whether you are a system integrator checking component authenticity or a forensic expert analyzing device history, knowing how to interpret this data is vital. An is the most efficient tool for unlocking the "janam-kundli" (manufacturing details) of your embedded storage.