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Indicates whether the device is a single chip or a multi-chip package.
This feature is essential for hardware developers, forensics experts, and repair technicians to verify the authenticity, age, and manufacturer of the storage silicon used in smartphones and IoT devices. Core Functionality
An 8-bit field indicating the month and year the chip was produced.
An is a critical tool for engineers, forensic analysts, and hardware enthusiasts working with embedded MultiMediaCards. The CID register is a 128-bit device-specific register that serves as the "digital birth certificate" of the flash memory chip. Decoding this hex string reveals the manufacturer, the age of the chip, and its technical specifications, which are vital for hardware validation and data recovery. The Structure of the CID Register emmc cid decoder
The answer lies within the . This article serves as a comprehensive guide to understanding what an eMMC CID is, breaking down its 128-bit structure, and explaining how an eMMC CID decoder works to reveal your storage's "DNA." What is an eMMC CID Register?
To decode a hex string from an eMMC CID, you can use specialized software or manual methods: Linux Systems
Many open-source and developer-hosted sites offer instant decoding. You simply paste your 32-character hex string into a browser text box, and the script parses the variables instantly.
There are several free online tools where you simply paste the string and hit "Decode." I can provide the specific Python script snippets
if you can provide it (32 characters). Identify the manufacturer of your chip based on its MID.
It‘s important to understand the differences between the various eMMC registers:
In the world of embedded storage, few pieces of data are as critical—yet as obscure—as the of an eMMC (embedded MultiMediaCard) chip. Whether you are a hardware hacker, a data recovery specialist, a forensic analyst, or an Android ROM developer, the CID holds the key to understanding your device’s storage identity.
To understand what an online or software-based eMMC CID decoder does instantly, we can manually break down a sample 128-bit hexadecimal CID string: 1501004d3447314445011234567841db 1. Segmenting the String Core Functionality An 8-bit field indicating the month
: Indicates if the device is a single chip or part of a multi-chip package. OEM/Application ID : Identifies the card OEM or contents. Product Name : 6-character ASCII string (e.g., "MAG2GA"). Product Revision : Hardware and firmware version of the chip. Product Serial Number : Unique 32-bit unsigned integer. Manufacturing Date : Month and year of production. CRC7 Checksum : Used to verify register integrity. How to Read the CID
An eMMC CID decoder automates the binary shifting and ASCII conversion required to read the raw hex. The most critical pieces of information it extracts include: 1. Manufacturer Identification (MID)
mdt_raw = (cid_bytes[3] << 8) | cid_bytes[2] year = 2000 + ((mdt_raw >> 4) & 0xFF) month = mdt_raw & 0x0F
You cannot decode what you cannot read. Extracting the CID requires either software access (if the device is booted) or hardware access (if the device is dead or locked).
In forensic investigations, verifying the storage chip's exact serial number and manufacturing origin establishes a strict chain of custody. If a mobile device or embedded system is physically damaged, forensic examiners desolder the eMMC chip (chip-off technique) and read the CID to match it against official device manifests. Smartphone and Automotive Repair
| Field | Hex Bits | Raw Value | Decoded Value | |-------|----------|-----------|---------------| | MID | Byte 0 | 0x15 | Manufacturer ID 21 (e.g., Samsung) | | CBX | Bits 113-112 | 0x01 | BGA (Discrete embedded) | | OID | Byte 14 | 0x00 | OEM ID 0 | | PNM | Bytes 7-12 | 53454d453247 | "SEME2G" | | PRV | Byte 13 | 0x08 | Revision 0.8 | | PSN | Bytes 3-6 | e3a42a08 | Serial number 3819587080 | | MDT | Byte 1 | 0x00 | Manufacturing date unknown |