Abstract: A method and system for encoding key product information in semiconductors is disclosed. The invention is particularly useful in connection with byte-wide memories, but also finds application in a wide range of semiconductor devices. A plurality of read only memory cells are juxtaposed on a semiconductor die with the circuitry which performs the primary function of the chip. The read only memory cells are interconnected with the primary circuit in such a manner that the information stored therein can be accessed only when such access does not interfere with the operation of the primary circuit. Important product information is stored in the ROM cells such as manufacturer, mask set, and other manufacturer-related information, as well as key circuit parameters such as supply voltages, operating currents, programming voltages, programming pulsewidths and the like.

Abstract: A method and system for encoding key process and test information in semiconductors is disclosed. The invention is particularly useful in connection with byte-wide memories, but also finds application in a wide range of semiconductor devices. A plurality of programmable memory cells are juxtaposed on a semiconductor die with the circuitry which performs the primary function of the chip. The programmable memory cells are interconnected with the primary circuit in such a manner that the information programmed and stored therein can be accessed only when such access does not interfere with the operation of the primary circuit. Important product processing and test information is stored in the programmable cells such as wafer number, lot number, processing parameters, special visual and test results and manufacturing rework data.