Emmc Cid Decoder -

The CID is a 128-bit register programmed by the card manufacturer that uniquely identifies an eMMC device. Fields and lengths follow the JEDEC and SD specifications adapted for eMMC (fields may vary by manufacturer/extended specs).

def decode_emmc_cid(cid_hex):
    cid_bytes = bytes.fromhex(cid_hex)
    if len(cid_bytes) != 16:
        raise ValueError("CID must be 16 bytes")
mid = cid_bytes[15]
pnm = cid_bytes[11:7:-1][::-1].decode('ascii').strip()
prv_major = (cid_bytes[7] >> 4) & 0x0F
prv_minor = cid_bytes[7] & 0x0F
psn = int.from_bytes(cid_bytes[6:3:-1], 'big')
mdt_raw = (cid_bytes[3] << 8) | cid_bytes[2]
year = 2000 + ((mdt_raw >> 4) & 0xFF)
month = mdt_raw & 0x0F
return 
    "mid": hex(mid),
    "manufacturer": lookup_manufacturer(mid),
    "product_name": pnm,
    "revision": f"prv_major.prv_minor",
    "serial": psn,
    "date": f"year-month:02d"

Manufacturer lookup table based on JEDEC JEP106 (available in many open‑source projects). emmc cid decoder

For deeper control, compile mmc-utils (common on Ubuntu/Debian). The CID is a 128-bit register programmed by

sudo mmc extcsd read /dev/mmcblk0 | grep CID