Patent ID: 8687438

Claim:
An integrated circuit memory device, comprising: an integrated circuit substrate; a device identification code register storing a selected device identification code from a plurality of device identification codes, the selected device identification code provided in response to requests from outside the integrated circuit memory device; a plurality of device identification memory cells on the semiconductor substrate; a plurality of device identification selection memory cells on the semiconductor substrate; and control circuitry that (i) operates the plurality of device identification codes with the plurality of device identification memory cells, the plurality of device identification codes including a plurality of bits identifying a type of the integrated circuit memory device, (ii) operates with selection data with the plurality of device identification selection memory cells, the selection data distinguishing from among the plurality of device identification codes including at least a first device identification code and a second device identification code, the plurality of device identification codes stored on the integrated circuit memory device outside the device identification code register, and (iii) is adapted to copy the selected identification code, from among the plurality of device identification codes, into the device identification code register.