A common engineering philosophy when designing a System-on-a-Chip (SoC) is to insure that they perform under “worst-case” conditions. Worst case in semiconductor manufacturing applies to very high temperatures and variations in the manufacturing process; transistor performance varies in a predefined range of parameters. Thus, some SoCs from the same wafer lot are capable of supporting higher operating frequencies (best case – fast process) or lower frequencies at the bottom of the predefined performance window (worst case – slow process) at the given voltage