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Apparatus-and-method-for-switching-an-operating-frequency-of-a-computer-motherboard

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Apparatus and method for switching an operating frequency of a computer motherboard

Details

Inventors: Lin, Wen-chung; Huang, Chih-ping; Fang, Hsan-yueh;
Assignee: ABIT Computer Corporation (Taipei, TW)
Primary Examiner: Heckler; Thomas M.
Assistant Examiner:
Attorney, Agent or Firm: Kirkpatrick & Lockhart LLP

An apparatus and method for switching the operating frequency of a computer host board by setting on a screen of the computer is disclosed. The apparatus and method use a frequency selection controller, instead of a switch or jumper selector used in a conventional apparatus and method, to control a frequency doubling factor required for the CPU and system chip set and a frequency selection signal output to a frequency generator. The switching operating frequency method is accomplished by manually activating the system to enable the system firmware to set a frequency doubling factor and an operating frequency when the system is powered up, outputting an address signal including the frequency and a frequency to be switched by a data/address bus after the system firmware sets the frequency doubling factor and the operating frequency, and decoding the address signal and locking the frequency data, whereby to change the frequency doubling factor output to the CPU and chip set and a frequency selection signal output to a frequency generator.

DETAILED DESCRIPTION One object of the present invention is to provide an apparatus and method for switching an operating frequency of a computer motherboard by means of setting on the screen of the computer, instead of by changing or adjusting the jumper.
Another object of the present invention is to provide an apparatus and method for randomly adjusting the CPU operating frequency.
When the resetting frequency is too high so that the computer can not be powered up, a resetting operation can be started on the screen simply by powering off and restarting the computer, without disassembling the computer and clearing the prior set.
In accordance with one aspect of the present invention, a method for switching an operating frequency of a computer host comprises the steps of manually activating a system to enable the system firmware to set a frequency multiplying factor and an operating frequency when the system is powered up; outputting an address signal including said frequency and a frequency to be switched by a data/address bus after the system firmware sets the frequency multiplying factor and the operating frequency; and decoding said address signal and latching said frequency data, thereby to change the frequency multiplying factor output to the CPU and chip set and a frequency selection signal output to a frequency generator.
In accordance with another aspect of the present invention, an apparatus for switching an operating frequency of a computer motherboard uses a frequency selection controller instead of a switch or jumper selector.
The frequency selection controller comprises a storage unit for storing and latching the frequency data input by the bus to be changed, said storage unit having a first output connected with the CPU and system chip set for outputting a frequency multiplying factor and a second output connected with the frequency generator for outputting a frequency selection signal, thereby the frequency multiplying factor and the operating frequency of the computer motherboard can be changed according to the locked frequency data; and a decoder unit for receiving an address signal of the switched frequency input by the bus and decoding and confirming the address signal thereby to output a sequence signal for activating the storage unit

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