To identify the manufacturer of a faulty eMMC chip before replacing it, ensuring compatibility with the motherboard.
# Convert hex string to bytes cid_bytes = bytes.fromhex(cid_hex)
: Another 8-bit field controlled and allocated by JEDEC, the OID identifies the device OEM and/or the device contents, particularly when used as distribution media on ROM or flash devices. emmc cid decoder
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: A 16-bit identifier for the original equipment manufacturer or specific application. PNM (Product Name) To identify the manufacturer of a faulty eMMC
Understanding the eMMC CID Decoder: How to Extract and Interpret Raw Flash Storage Data
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A unique code for the manufacturer (e.g., 0x15 = Samsung, 0x13 = Micron). OID OEM/Application ID: Specific OEM code. PNM Product Name: ASCII characters identifying the model. PRV Product Revision: Revision number (Major/Minor). PSN Product Serial Number: Unique 32-bit serial number. MDT Manufacturing Date: Month and year of production. CRC CRC7 Checksum: Used for verifying the CID data integrity. How to Decode eMMC CID Manually
# Decode ASCII fields pnm_bytes = (result['PNM'].to_bytes(6, 'big')).decode('ascii').strip() prv_major = (result['PRV'] >> 4) & 0xF prv_minor = result['PRV'] & 0xF month = (result['MDT'] >> 4) & 0xF year = result['MDT'] & 0xF year = 1997 + year # Year offset, adjust for more recent devices if needed