An 8-bit figure assigned by the SD-3C or JEDEC. For example, 0x15 usually indicates Samsung, while 0x13 points to Micron.
An 8-bit field representing the month and year the chip was produced. emmc cid decoder
# Bytes 10-13: Product Serial Number (PSN) psn = int.from_bytes(raw_bytes[10:14], byteorder='big') An 8-bit figure assigned by the SD-3C or JEDEC
Or use mmc-utils :