Agere Systems Guardian Corp.

Eric Wilcox

Xingdong Dai

Richard Muscavage

Laurence Edward Bays

Dennis A Brooks

A computer peripheral device suitable for operation with a Peripheral Component Interconnect (PCI) Bus or the like, has the ability to &ldquo;wakeup&rdquo; the bus from a cold state (e.g., D3,) without the need to supply auxiliary power (e.g., 3.3 volts) to the entire device during the cold state. A modem in the preferred embodiment (although the invention is applicable to other peripheral devices), the device latches device status information from the main circuitry of the device (operating on 5 volts, for example) into a &ldquo;keep alive&rdquo; circuit connected to the auxiliary power supply upon the falling edge of a PCI reset signal (RST&num;). Additionally, the auxiliary power supply also powers a ring detect circuit for the detection of an incoming telephone call, which incoming call triggers a Power Management Event (PME&num;) signal for changing the state of the bus to an active state. Further, the auxiliary power supply powers a RST&num; detection circuit for indicating that a change in the power state of the bus is imminent.

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Allentown, PA, United States of America

Eric Wilcox