Abstract: An integrated circuit package includes at least one one-time programmable element, such as a fuse, having a first and a second end separated by a programmable link. The first end of the one-time programmable element is coupled to a power supply voltage node in the package. The second end of the programmable element may be coupled to an external package connection (e.g., a package pin) and/or to an internal package node that connects to an input terminal of the integrated circuit die when the integrated circuit die is mounted in the package. The information programmed by the fuses may relate to speed or voltage ratings for a microprocessor.

Abstract: A core voltage for a core logic region of an integrated circuit is specified by a programmable register on the integrated circuit. Output terminals on the integrated circuit are coupled to the programmable storage location and supply voltage control signals for a voltage regulator to specify the core voltage according to the contents of the programmable register. The output terminals may output a programmable voltage setting or a fixed voltage setting that specifies a default core voltage value, depending on reset conditions.