Abstract: An on-die record-of-age circuit includes a reference oscillator circuit, an aging oscillator circuit, and a frequency comparator. A circuit component is coupled to receive a logic clock signal and to execute a function during operation. The reference oscillator circuit generates a reference clock signal having a reference frequency. The aging oscillator circuit generates an aging clock signal having an aging frequency that degrades during operation of the circuit component. The frequency comparator is coupled to compare the aging frequency with the reference frequency to generate an age signal, which depends on the operational age of the circuit component.

Abstract: In accordance with various embodiments of the present invention, a cache-equipped semi-conductor device is provided with enhanced error detection logic to detect a first location-independent error within an area of the cache memory and prevent further use of the area if the error is determined to be the second consecutive error associated with a common area.