The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 28, 2001
Filed:
Feb. 26, 1999
Laurence Edward Bays, Allentown, PA (US);
Richard Muscavage, Gilbertsville, PA (US);
Dennis A. Brooks, Allentown, PA (US);
Xingdong Dai, Bethlehem, PA (US);
Eric Wilcox, Allentown, PA (US);
Agere Systems Guardian Corp., Orlando, FL (US);
Abstract
A computer peripheral device suitable for operation with a Peripheral Component Interconnect (PCI) Bus or the like, has the ability to “wakeup” 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 “keep alive” circuit connected to the auxiliary power supply upon the falling edge of a PCI reset signal (RST#). 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#) signal for changing the state of the bus to an active state. Further, the auxiliary power supply powers a RST# detection circuit for indicating that a change in the power state of the bus is imminent.