Computer peripheral device having the capability to wake up from a cold state with information stored before cold powerdown
US6282666A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1999 |
| Grant date | Aug 28, 2001 |
| Priority date | — |
| Expiry date | Feb 26, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D10/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.sub.cold) 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.