Power management unit including software configurable state register and time-out counters for protecting against misbehaved software
US5504910A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1994 |
| Grant date | Apr 2, 1996 |
| Priority date | — |
| Expiry date | Feb 2, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/50
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A power management unit including a set of time-out counters and a software configurable state register is provided for managing power consumption within a computer system. Depending upon the state of the power management unit, a power control unit and a clock control unit are configured such that power may be applied or removed from certain components of the computer system and such that the frequencies of a CPU clock signal and a system clock signal may be raised or lowered. The power management unit includes a software configurable state register which allows system software, such as APM responsive software within the system BIOS, to control the state of the power management unit. When the power management unit is in a ready state during which the CPU clock signal and the system clock signal are driven at maximum frequencies and during which power is applied to all computer components, a time-out counter is activated to begin a first count down period. A system monitor monitors various circuit portions of the computer system during this period, and, if certain system activity is not detected, the power management unit enters a doze state upon lapse of the time-out counter. Durin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.