Two 4-bit BCD digits representing hardware and firmware revisions. (Product Serial Number)
The first byte reveals who actually manufactured the silicon. Matching the MID hex code to known JEDEC identifiers exposes the vendor: 0x15 = Samsung 0x13 = Micron 0x45 = SanDisk / Western Digital 0x90 = SK Hynix 0x70 = Kingston 0xFE = Micron / Numonyx 2. Product Name (PNM)
Identifies the company that produced the chip. OEM ID: Identifies the client that ordered the custom chip. Product Name: The specific model number. Product Revision: Firmware/hardware version. Serial Number: Unique identifier. Manufacturing Date: Month and Year of production.
Once you have the 32-character hex string, you need a decoder. Here are the most common options, from beginner-friendly to advanced. emmc cid decoder
For dead or unbootable devices, the eMMC chip must be desoldered (via BGA rework) or accessed via ISP (In-System Programming) flywires. Hardware boxes like the EasyJTAG Plus will automatically read the CID register upon initializing the chip and print the decoded breakdown directly into the software log console.
An eMMC CID decoder takes a 32-character hexadecimal string (which represents 16 bytes or 128 bits) and breaks it down into specific fields. The CID structure includes the following crucial information: Description
If you can provide the you're looking to analyze, I can help you decode it and provide the manufacturer, production date, and model information . Project: Read, Collect & Decode SD Card CID Register Data Two 4-bit BCD digits representing hardware and firmware
If you have root access or a terminal interface on an embedded Linux system, you can read the CID directly from the sysfs file system: cat /sys/block/mmcblk0/device/cid Use code with caution.
(MDT decode: year = 0xb4 = 180 months after 1997? eMMC spec uses 1997 + BCD year)
This maps to a specific month and year (e.g., January 2014, depending on the JEDEC standard version epoch used). Types of eMMC CID Decoder Tools Product Name (PNM) Identifies the company that produced
: 0xb1 (Note: Bits are offset depending on the specific eMMC specification version, typically splitting into a 4-bit month and a 4-bit or 8-bit year offset from 1997 or 2013).
These tools read the CID directly via the eMMC bus (CLK, CMD, D0) using a soldered or pogo-pin connection.