Emmc Cid Decoder <100% Original>

Once you have the 32-character hexadecimal string, you need to decode it. You have several options:

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

| Bit Position | Field Name | Size (bits) | Description | |--------------|------------|-------------|-------------| | [127:120] | MID | 8 | Manufacturer ID (JEDEC-assigned) | | [119:112] | CBX | 8 | Card/BGA (not widely used) | | [111:104] | OID | 8 | OEM/Application ID | | [103:96] | PNM (first char) | 8 | Product name (character 1) | | [95:88] | PNM (second char) | 8 | Product name (character 2) | | [87:80] | PNM (third char) | 8 | Product name (character 3) | | [79:72] | PNM (fourth char) | 8 | Product name (character 4) | | [71:64] | PNM (fifth char) | 8 | Product name (character 5) | | [63:56] | PNM (sixth char) | 8 | Product name (character 6) | | [55:48] | PRV | 8 | Product revision (BCD) | | [47:40] | PSN (byte 1) | 8 | Product serial number (MSB) | | [39:32] | PSN (byte 2) | 8 | Product serial number | | [31:24] | PSN (byte 3) | 8 | Product serial number | | [23:16] | PSN (byte 4) | 8 | Product serial number (LSB) | | [15:12] | MDT (year) | 4 | Manufacturing date (year) | | [11:8] | MDT (month) | 4 | Manufacturing date (month) | | [7:1] | CRC | 7 | CRC7 checksum | | [0] | - | 1 | Reserved (always 1) | Once you have the 32-character hexadecimal string, you

Note: Some older eMMC versions have slight variations, but most modern devices conform to this layout. Manufacturer lookup table based on JEDEC JEP106 (available