An integrated circuit (IC) chip contains a small non-volatile “ID” memory such as an FeRAM array that stores information associated with manufacturing, testing, and performance of the IC chip. The stored information can include but is not limited to a serial number, a wafer ID, a batch ID, a date...http://www.google.com/patents/US6952623?utm_source=gb-gplus-sharePatent US6952623 - Permanent chip ID using FeRAM
