CN1198192C

CN1198192C - Method for switching control source of computer display device and computer host board using said method

Info

Publication number: CN1198192C
Application number: CN 02129888
Authority: CN
Inventors: 林火元
Original assignee: Giga Byte Technology Co Ltd
Current assignee: Giga Byte Technology Co Ltd
Priority date: 2002-08-20
Filing date: 2002-08-20
Publication date: 2005-04-20
Anticipated expiration: 2022-08-20
Also published as: CN1477473A

Abstract

The present invention relates to a method for switching control sources of a computer display device and a computer host board using the method. The present invention mainly uses a detection circuit to detect whether an AGP card is inserted into an AGP slot or not; according to a detection result, a VGA chip built in the computer host board is enabled or inhibited, which is determined; according to the detection result, a switching circuit can be controlled and used to switch an AGP bus into the VGA chip or AGP slot; when the AGP card is inserted into the AGP slot, the VGA chip is inhibited, and the AGP bus is switched to the AGP slot; otherwise, the VGA chip is enabled, and the AGP bus is switched to the VGA chip. Through the present invention, the whole computer host board not only can automatically switch the control sources of the computer display device to the VGA chip or AGP card, but also eliminates the consideration of signal quality affected by a branch circuit, since a bus of a north bridge chip which is connected with the AGP slot or VGA chip is independent.

Description

The method of switching control source of computer display device and utilize the computer motherboard of this method

Technical field

The invention relates to a kind of changing method of control source of computer display device and utilize the computer motherboard of this method.Especially refer to method that a kind of VGA chip chamber that is built in computer motherboard in the AGP of plug-in mounting card reaches switches and the computer motherboard that can realize this method.

Background technology

Shown in Figure 3 is the partial circuit block scheme that generally has the computer motherboard of built-in VGA chip (Onboard VGA Chip), this computer motherboard is based on the notion of low-price computers, common function with display card is integrated into the VGA chip 60 on the computer motherboard, this VGA chip 60 generally is the display chip that adopts at a low price, ATI RAGE128 for example, SIS305, SIS315 etc., to reduce cost, yet, strengthen the user of image Presentation Function in order to satisfy desire, can be provided with one on the motherboard again can be for the slot 70 of AGP card plant, and as switching the setting apparatus 80 that utilizes, wherein, setting apparatus 80 is that the mode (Jumper) of utilizing wire jumper is set this VGA chip 60 and is activation or forbidden energy, when VGA chip 60 is set to activation, the image data of being sent here by north bridge chips 90 will be delivered to via the AGP bus and export computer monitor again to after VGA chip 60 is handled, and when VGA chip 60 is set to forbidden energy, to deliver to AGP slot 70 via the AGP bus by the image data that north bridge chips 90 is sent here, and export computer monitor again to after handling by the AGP card on it planted, in other words, when the AGP card is inserted in AGP slot 70, need just can use the Controlling Source of AGP card behind VGA chip 60 forbidden energy earlier as computer monitor, and if only need utilize VGA chip 60 as the Controlling Source of computer monitor the time, then need VGA chip 60 is set at activation, and the AGP card is pulled out.

Above-mentioned way, though can make a computer motherboard meet the assembling demand of low-price computers, also can be by AGP slot 70 for the demonstration usefulness and the quality of plant AGP card with the lifting computer monitor, but after deliberation, have the computer motherboard of VGA chip in this kind, following shortcoming is in fact still arranged and demand urgently improving:

At first, when the user need change the Controlling Source of computer monitor, must adjust Jumper according to technical manual, also promptly utilize setting apparatus 80 to set the VGA chip in activation or forbidden energy, and then plant or pull out the AGP card, such way quite bothers, takes a lot of trouble and be easy to generate mistake, especially for computer assembling green hand.

Moreover, because north bridge chips 90 is to connect VGA chip 60 with the AGP bus, utilize the mode of branch road bus to connect AGP slot 70 again, therefore, when using the AGP card on the AGP slot 70 when forbidden energy VGA chip 60, be sent to the image data of AGP card through the AGP bus by north bridge chips 90, its signal quality will be subjected to the interference of the A of branch (be connected to VGA chip 60 a section) of AGP bus easily, and when activation VGA chip 60, be sent to the image data of VGA chip 60 through the AGP bus by north bridge chips 90, its signal quality then is subjected to the interference of the B1 of branch of AGP bus and B2 (be connected to AGP slot 70 one section) easily, no matter the user has adopted the Controlling Source of what person for computer monitor, north bridge chips all can be subjected to the influence of the A of branch or B1 of branch and B2 and cause signal bad when transmitting image data, cause system's shakiness.

Therefore, how to provide a kind of new invention that can improve the problems referred to above point really, show by relevant masses and looked forward to.

Summary of the invention

In view of this, the technical problem to be solved in the present invention provides a kind of method of energy automatic switching computer display Controlling Source.

In order to achieve the above object, the method of automatic switching computer display Controlling Source provided by the invention, may further comprise the steps: detect an AGP slot earlier and whether plugged the AGP card, again according to testing result, be built in the VGA chip of motherboard in decision activation or the forbidden energy one, and according to testing result, decision switches to this VGA chip or AGP slot with the AGP bus, when on the AGP slot during plant AGP card, it is this VGA chip of automatic forbidden energy, and make the AGP bus switch to the AGP slot, otherwise, if do not plug then this VGA chip of activation and make the AGP bus switch to the VGA chip of AGP card.

Mode whereby, the Controlling Source of computer monitor will be automatically switched to VGA chip or AGP card, the user need not take any trouble about at all Jumper setting and can significantly promote convenience in the computer assembling.

Another technical matters that the present invention will solve provides a kind of motherboard of energy automatic switching computer display Controlling Source.

In order to achieve the above object, the invention provides a kind of computer motherboard, the Controlling Source of computer monitor can be automatically switched to the built-in VGA chip of computer motherboard or be inserted in AGP card on the AGP slot, it is characterized in that: set up a testing circuit and on the computer motherboard and switch circuit, the input side of this testing circuit is connected to this AGP slot, and its outgoing side is connected to this commutation circuit and VGA chip respectively, whether to detect this AGP slot is idle, control action and activation or this VGA chip of forbidden energy of this commutation circuit, the input side of this commutation circuit is connected to this testing circuit and a north bridge chips, its outgoing side is connected to AGP slot and VGA chip respectively, input signal according to testing circuit determines that north bridge chips is to be connected to AGP slot or VGA chip, wherein, north bridge chips is the AGP bus via commutation circuit with the path that is connected to AGP slot or VGA chip.

In the such scheme, be characterized in that this testing circuit is the control circuit based on transistor.

In the such scheme, be characterized in that this commutation circuit is the circuit based on the change-over switch chip.

Design whereby, the control that makes whole computer motherboard not only have the automatic switching computer display comes from VGA chip or AGP card, and the bus that more is connected to AGP slot or VGA chip because of north bridge chips is and does not independently have the misgivings that branched line influences signal quality.

Description of drawings

Fig. 1 is the process flow diagram of the inventive method.

Fig. 2 is the partial circuit block scheme that utilizes the computer motherboard of the inventive method enforcement.

Fig. 3 is the partial circuit block scheme that discloses a kind of known computer motherboard.

Embodiment

For further specifying content of the present invention and technique effect, below lift a preferred embodiment and cooperate graphic and describe in detail, but for embodiment only for realizing optimal way of the present invention, be not in order to scope of patent protection of the present invention is done any type of restriction.

Shown in Figure 1 is the control flow of the inventive method preferred embodiment, and it comprises at least:

Detect step 11 and step 12 that whether an AGP slot has plugged the AGP card;

If testing result AGP card has been inserted in the AGP slot, then carry out forbidden energy VGA chip step 13, and the AGP bus switched to the step 14 of AGP slot;

The AGP card if testing result AGP slot is not planted, then carry out activation VGA chip step 15, and the AGP bus switched to the step 16 of VGA chip.

When the user selects to use the AGP card and it is inserted in the AGP slot, utilize said method, can interrupt being connected between VGA chip and the north bridge chips on the motherboard immediately, even and constitute with north bridge chips with the AGP card and to be connected, with the running of AGP card control computer monitor; And when if the user only needs VGA chip on user's motherboard to come the running of controlling computer display, then only need make the AGP slot be idle (for example: do not plug or pull out the AGP card), utilize above-mentioned method, can interrupt being connected between AGP slot and the north bridge chips immediately, even and constitute in succession with north bridge chips and VGA chip, with the running of VGA chip controls computer monitor.

Moreover, see also Fig. 2, it shows a kind of partial circuit block scheme of the computer motherboard that utilizes said method and implement, it mainly is a testing circuit 10 and to be set switch circuit 20 on computer motherboard, and this testing circuit 10 is connected to an AGP slot 30, to detect whether this AGP slot 30 is idle, this testing circuit 10 is connected to this commutation circuit 20 more again, action situation with control commutation circuit 20, in addition, this testing circuit 10 is connected to a VGA chip 40 again, with activation or this VGA chip 40 of forbidden energy, wherein, this commutation circuit 20 can determine that the AGP bus is to be connected to AGP slot 30 or VGA chip 40 by north bridge chips 50, in the present embodiment, testing circuit 10 can be the control circuit based on transistor, commutation circuit 20 then can be change-over switch chip (Quick Switch), in addition, north bridge chips 50 through commutation circuit 20 and in arrive AGP slot 30 or the VGA chip 40 employed bus be the AGP bus;

By above-mentioned circuit structure, can utilize testing circuit 10 to detect the AGP slot 30 AGP card of whether having planted, in the time of in the AGP card is not inserted in AGP slot 30, testing circuit 10 is an activation VGA chip 40, and driving commutation circuit 20 immediately in connecting VGA chip 40 and north bridge chips 50, computer monitor be handled and be exported to the image data that makes north bridge chips 50 send here can by VGA chip 40 and interlock circuit thereof; And in the AGP card is inserted in AGP slot 30 time, testing circuit 10 is a forbidden energy VGA chip 40, and drive commutation circuit 20 immediately in connecting AGP slot 30 and north bridge chips 50, computer monitor be handled and be exported to the image data that makes north bridge chips 50 send here can by the AGP card on the AGP slot 30, in brief, the user only need determine whether will install additional the preferable AGP card of usefulness, the image data that motherboard can determine north bridge chips 50 to send here automatically will be handled and be exported by VGA chip 40 or AGP card 50, therefore the user needs not take any trouble about to adjust in how Jumper at all, this can reduce on the one hand wrong generation, also can make the having more affinity of computer motherboard on the other hand and is convenient to utilize.

Moreover, when AGP is stuck in operation, VGA chip 40 is 10 forbidden energy of detected circuit, and the transfer path of image data is a north bridge chips 50, commutation circuit 20, the AGP card is so that computer monitor, and when the AGP card is not inserted into AGP slot 30, VGA chip 40 with detected circuit 10 activations in running, and the transfer path of image data is a north bridge chips 50, commutation circuit 20, VGA chip 40 is so that computer monitor, for north bridge chips 50, the transfer path of its image data is two non-interfering independent pathways, so the former a certain path of stating of image data is when transmitting, the existence in another path can't have influence on the signal quality when transmitting, and it is stable to make that the computer system image shows, well.

Know easily that in sum the present invention can borrow its every particular design really and reach foregoing invention purpose and effect, dark tool industry applications.

Claims

1, a kind of method of automatic switching computer display Controlling Source, it may further comprise the steps:

Detect an AGP slot and whether plugged the AGP card;

According to testing result, decision activation or forbidden energy one are built in the VGA chip of computer motherboard;

According to testing result, decision switches to this VGA chip or AGP slot with the AGP bus; And

When on the AGP slot during plant AGP card, this VGA chip of forbidden energy, and make the AGP bus switch to the AGP slot, otherwise, this VGA chip of activation and make the AGP bus switch to the VGA chip then.

2, a kind of computer motherboard can automatically switch to the Controlling Source of computer monitor the built-in VGA chip of computer motherboard or be inserted in AGP card on the AGP slot, it is characterized in that:

Set up a testing circuit and on the computer motherboard and switch circuit, the input side of this testing circuit is connected to this AGP slot, and its outgoing side is connected to this commutation circuit and VGA chip respectively, whether to detect this AGP slot is idle, control action and activation or this VGA chip of forbidden energy of this commutation circuit, the input side of this commutation circuit is connected to this testing circuit and a north bridge chips, its outgoing side is connected to AGP slot and VGA chip respectively, input signal according to testing circuit determines that north bridge chips is to be connected to AGP slot or VGA chip, wherein, north bridge chips is the AGP bus via commutation circuit with the path that is connected to AGP slot or VGA chip.

3, computer motherboard as claimed in claim 2 is characterized in that described testing circuit is for comprising transistorized control circuit.

4,, it is characterized in that described commutation circuit is the circuit that comprises the change-over switch chip as claim 2 or 3 described computer motherboards.