Patent ID: 7705626

Claim:
A design structure embodied in a machine readable medium used in a design process, for reducing noise in an integrated circuit (IC) comprising: a primary circuit receiving a first power supply voltage for powering-up a voltage island circuit on the IC and functional circuitry on the IC; a secondary circuit receiving a second power supply voltage for powering-up the voltage island; a programmed device for directing the primary and secondary circuits for powering the voltage island circuit and functional circuitry, the programmed device directing the secondary circuit to initially enable powering-up of the voltage island circuit to a pre-charged state, and subsequently disabling the secondary circuit while directing the primary circuit to enable powering of the functional circuitry during operation and the voltage island circuit, wherein a step response is avoided at the voltage island; and, wherein said programmed device operates as a header control for prioritizing initial power requests for multiple voltage islands.