Emmc Cid Decoder New! Today
An eMMC CID decoder is used to interpret the 128-bit Card Identification (CID) register of an embedded MultiMediaCard (eMMC). This register contains critical hardware-level metadata, such as the manufacturer ID, product name, and serial number. 1. How to Retrieve the Raw CID
Quick manual decode (offsets, 0-indexed): emmc cid decoder
- Identify counterfeit or swapped eMMC modules
- Validate hardware during repairs (phones, SBCs, laptops)
- Forensic analysis & low-level system recovery
Option 3: Commercial Tools (For Professionals)
Tools like MMC Utility (by Rusolut) or Flash Extractor include advanced decoders that also validate CRC and parse extended CSD registers linked to the CID. An eMMC CID decoder is used to interpret
Field Explanation
| Field | Bytes | Description |
| :--- | :--- | :--- |
| MID | 0 | Manufacturer ID. I mapped the most common IDs (Samsung, SanDisk, Toshiba, Micron) in the script. |
| OID | 1-2 | OEM/Application ID. Usually 2 characters hex identifying the card customer or specific application. |
| PNM | 3-8 | Product Name. ASCII string (up to 6 characters). Often model numbers like "BJTD4R" or "8GTF4". |
| PRV | 9 | Product Revision. Binary Coded Decimal (BCD). 0x18 = Rev 1.8. |
| PSN | 10-13 | Product Serial Number. A 32-bit unique integer. |
| MDT | 14 | Manufacturing Date. 4 bits for Month (1-12), 4 bits for Year (Offset from 1997). |
| CRC | 15 | Cyclic Redundancy Check. The script verifies this to ensure the CID is valid and not corrupted. | Option 3: Commercial Tools (For Professionals) Tools like
: For devices with an eMMC slot (like a Chromebook or Rock Pi), you can read the CID directly from the sysfs interface: cat /sys/block/mmcblkX/device/cid Hardware Tools : Specialized tools like the Easy JTAG Plus
6. CRC7 verification
- CRC7 polynomial: x^7 + x^3 + 1 (polynomial 0x09) commonly used in SD/eMMC for CID/CSD.
- Compute CRC7 across the CID bits excluding the final CRC+end bit (usually bits 127..8 = 120 bits), compare to stored CRC7 field.
- Cause: You have 31 or 33 characters. The CID is exactly 32 hex characters (16 bytes). Check your input.