Emmc Cid Decoder Updated

Let us decode a real-world 32-character example string: 150100414a343561320251a37c02b1bf Raw Hex: 15 01 00 41 4a 34 35 61 32 02 51 a3 7c 02 b1 bf Step 1: Parsing the Manufacturer ID (MID) : 0x15

Once the raw CID data is obtained, it must be parsed according to the register map to be human-readable. The following tools automate this process:

Ever wondered what your device’s internal storage is really telling the host? Every eMMC chip has a hidden ID card – the . emmc cid decoder

standard, the CID is transmitted in a 136-bit response (R2) during the device identification phase. The 128 bits of actual data are partitioned as follows: Prodigy Technovations Field Name Description (Manufacturer ID) Unique code for the manufacturer (e.g., Samsung: , SK Hynix: (Device/BGA) Indicates the package type or device category. Assigned to the Original Equipment Manufacturer. (Product Name) 6 ASCII characters representing the model (e.g., "JS04AC"). (Product Revision) Hardware and firmware revision versions. (Product Serial Number) A strictly unique serial number. (Manufacturing Date) Encodes the month and year of production. (Checksum) Error detection code to ensure data integrity. 2. Decoding Methods

For developers interested in creating custom CID decoding solutions, here‘s a simple Python implementation to get started: Let us decode a real-world 32-character example string:

: A 6-character ASCII string representing the model name (e.g., "MAG2GA"). PRV (Product Revision)

To decode a CID, you must first read the raw hex string from the device: standard, the CID is transmitted in a 136-bit

: byte offset counts from most significant byte (byte 15) to least (byte 0). Many decoders use 0‑based array indexing starting at CID[0] = MSB.

Most CID decoders are either small software utilities or web-based scripts. They work by taking a 32-character hexadecimal string and using bitwise shifts and masks to isolate the specific bits assigned to each field. For example, to find the , a decoder looks at bits [15:8] of the register, where 4 bits represent the month and 4 bits represent the year (offset from 2010 or 1997 depending on the specification version). Conclusion

The first two hex characters (8 bits) represent the manufacturer. Decoders match this byte against a known JEDEC registry database. For example: 0x15 = Samsung 0x90 = SK Hynix 0x45 = SanDisk 0x13 = Micron 0xFE = Micron/Numonyx 0x70 = Kingston 2. Decoding the Product Name (PNM)