"Device does not expose CID"
| Bits | Field | Name | Description | | :--- | :--- | :--- | :--- | | [127:120] | MID | Manufacturer ID | 8-bit ID assigned by JEDEC (e.g., 0xFE = Samsung, 0x15 = Kingston) | | [119:112] | CBX | Card/BGA (OEM/Application) | Used by the manufacturer | | [111:104] | OID | OEM/Application ID | Identifies the OEM who built the card | | [103:96] | PNM (First 8 bits) | Product Name (Part 1) | First 8 bits of the product name (ASCII) | | [95:88] | PNM (Second 8 bits) | Product Name (Part 2) | | | [87:80] | PNM (Third 8 bits) | Product Name (Part 3) | | | [79:72] | PNM (Fourth 8 bits) | Product Name (Part 4) | | | [71:64] | PNM (Fifth 8 bits) | Product Name (Part 5) | | | [63:56] | PNM (Sixth 8 bits) | Product Name (Part 6) | | | [55:48] | PRV | Product Revision | Major/Minor revision (e.g., 0.1, 3.2) | | [47:40] | PSN (First 8 bits) | Product Serial Number (Part 1) | 32-bit unique serial number | | [39:32] | PSN (Second 8 bits) | Product Serial Number (Part 2) | | | [31:24] | PSN (Third 8 bits) | Product Serial Number (Part 3) | | | [23:16] | PSN (Fourth 8 bits) | Product Serial Number (Part 4) | | | [15:12] | MDT | Manufacturing Date | Year/Month of production | | [11:8] | (Reserved) | Reserved | Set to zero | | [7:1] | CRC | CRC7 | 7-bit checksum of CID fields | | [0] | (Reserved) | Always 1 | Fixed value | emmc cid decoder
Most modern decoders exist as web-based tools or command-line utilities. A user typically retrieves the raw CID string from a device (for example, via /sys/block/mmcblkX/device/cid in Linux) and pastes it into the decoder. The software then performs bitmasking and ASCII conversion to present a structured table of the chip's internal identity. "Device does not expose CID" | Bits |
Identifies the OEM or application for which the card was intended. An ASCII string (6 characters) representing the model name. Product Revision The hardware/firmware revision of the product. Serial Number A unique 32-bit binary number. Manufacturing Date Month and year the chip was produced. CRC7 Checksum Used to verify the integrity of the CID data. Available Decoding Tools JEDEC STANDARD - NXP Community Identifies the OEM or application for which the
The CID structure for eMMC differs slightly from standard SD cards, particularly in the product name and manufacturing date fields. Below are the primary fields extracted during decoding: Abbreviation Length (bits) Description Assigned by JEDEC to specific manufacturers. Device/BGA Indicates whether the device is a card or an embedded BGA. OEM/Application ID
If the device won't boot, you need an eMMC hardware programmer like: