JP2000259294A - Ac'97 hot dock system and its switching method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To share an AC'97 controller and to easily switch analog components of a notebook computer and a docking station by hardware. SOLUTION: A first AC'97 codec 82 of an analog comaponent 2 or a second AC'97 codec 83 of an analog component 3 is connected with the AC'97 controller 7 via an AC link (controller) 61, an AC link (main) 62, AC links (sub) 63, 63a and a docking bridge 4 and the analog component 2 or 3 to be connected with the AC'97 controller 7 is switched according to a detection signal to detect connection of first and second docking connectors 5a, 5b by the docking bridge 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an AC'97 hot dock system suitable for switching an AC'97 sound circuit and a switching method thereof.

[0002]

2. Description of the Related Art An AC'97 sound circuit provides a sound function to a personal computer, and is divided into a digital component and an analog component.

A digital component is an AC'97 controller, which controls an analog component. The analog component includes an AC'97 codec and an analog device such as a speaker and a microphone connected to the AC'97 codec. AC'9
Seven codecs perform digital-to-analog conversion of the sound signal.

[0004] The AC'97 controller and the AC'97 codec are connected by a digital serial bus called an AC link. This AC link has two serial data lines. One is the data output line to AC'97 codec, the other is A
Data input line from C'97 codec.

The data structure of these serial data is 1
There are 13 slots per frame. To each slot, a register address and register data for an AC'97 codec, or a digital sound signal for each analog sound device are allocated.

An analog input from a microphone or the like is AC'9.
The signal is converted into a digital sound signal by the seven codecs and transmitted to the system as digital sound data by the AC'97 controller. The digital sound data sent from the system is converted into serial data by an AC'97 controller, and then converted to AC'9.
The signal is converted into an analog signal by the seven codecs and output from a speaker or the like.

When a sound function is built in a personal computer,
In a system having an AC link, by using AC'97 codec as an analog component, the circuit scale can be made smaller than when a general sound circuit is used. Also, the AC link can separate analog components of the sound from the digital circuits of the system, making circuit design easier.

When connecting a portable device such as a notebook personal computer to an extension device such as a docking station and providing a sound input / output device such as a microphone / speaker on the docking station, care must be taken.

Since analog signals from these microphones and speakers are greatly affected by electric noise, it is desirable to minimize the analog signals. Therefore, when connecting a sound analog signal from the docking station side to the sound circuit on the notebook computer side, the length of the signal line becomes longer, which makes the design very difficult.

In order to avoid this, it is conceivable to provide a sound circuit also on the docking station side and use it exclusively with the sound circuit on the notebook personal computer side. In this case, one is always unused, which is wasteful and uneconomical.

Here, on the notebook computer side, AC'97
If a sound circuit is used, the above problem can be solved by providing an AC link at the interface with the docking station.

Since the AC link is a serial bus, it requires only a small number of interface signals, and since it is a digital signal, it is effective as a measure against noise.

Further, since only the analog component of the AC'97 sound circuit is required as the sound circuit on the docking station side, it is more economical to provide the sound circuit as described above. In order to realize this, for example, a system configuration as shown in FIG. 5 can be considered.

That is, the system shown in FIG.
It comprises a 97 sound circuit 19 and an analog component 3.

The AC'97 sound circuit 19 is provided in a notebook personal computer and provides sound functions such as sound reproduction and recording. Analog component 3
Is an analog component of the AC'97 sound circuit, which is provided in a docking station that provides an extended function by docking with a notebook computer.

The AC'97 sound circuit 19 includes the analog component 2, the AC'97 controller 7, and the selector 20.

The analog component 2 includes a first A
C'97 codec 82, microphone 92 and speaker 1
02. First AC'97 Codec 82
Performs digital-analog conversion or analog-digital conversion.

An AC link (controller) 61, an AC link (main) 62 and an AC link (sub) 63 are connected to the selector 20. AC link (sub) 6
3 is connected to a first docking connector 5a.

The analog component 3 includes a second A
C'97 codec 83, microphone 93 and speaker 1
03. The second AC'97 codec 83
Are connected to the second docking connector 5b via an AC link (sub) 63a.

In such a configuration, the analog components connected to and used by the AC97 controller 7 are:
Switching to the analog component 2 of the notebook computer or the analog component 3 of the docking station is performed by the select signal 21.

As another example, a system configuration as shown in FIG. 6 can be considered.

That is, an AC'97 codec (2.0) 24 is used as the analog component 23 in FIG.

AC'97 codec (2.0)
It is a function expansion version of AC'97 codec. AC'9
7 codecs can be connected only to one AC'97 controller, but by using AC'97 codec (2.0), AC'97 codec and AC'97 codec (2.0) can be connected simultaneously. And docking support is also ensured.

[0024]

However, in the former system configuration described above, the function of the data register for storing the register setting of the AC'97 controller 7,
It does not have the function of the write master that performs the copy.
In addition, it does not have a function of performing automatic switching when docking between the docking connectors 5a and 5b is detected.

Therefore, when a hot dock occurs, it is necessary to detect the occurrence of the hot dock by software. When the occurrence of hot dock is detected, A
The C'97 controller 7 is stopped, and the select signal 21
After switching the first AC'97 codec 82 connected to the AC'97 controller 7 to the second AC'97 codec 83, the AC'97 controller 7 is activated again and the second AC'97 It is necessary to perform the initial setting of the codec 83.

Similarly, when a hot undock occurs, the software executes
The AC'97 controller 7 is stopped, and the second AC'9
7 codecs 83 to the first AC'97 codec 8
After switching to 2, the AC'97 controller 7 needs to be activated again to perform the initial setting of the first AC'97 codec 82.

That is, the procedure is complicated because it is necessary to control everything by software. Since the AC'97 controller 7 is used for the processing and the initial setting, the sound function cannot be used during that time.

Here, it is possible to use the detection signal that changes in hardware by the connection of the docking connectors 5a and 5b as the select signal 21 to perform automatic switching. However, in this case, the AC'97 controller 7 must be switched in an unused state and restarted, so that hot dock / hot undock becomes impossible. In other words, it is possible only at the time of cold / warm dock or cold / warm undock, which is connection / disconnection while the power of the system is turned off.

In the latter system, the analog component 23 is connected to the AC'97 sound circuit 22.
It is physically possible to connect to However, A
Since it does not have a data register function for storing the register setting of the C'97 controller 7 or a write master function for copying the same, the automatic first AC'97 codec 82 and the Setting and switching of the AC'97 codec (2.0) 24 is impossible.

That is, even if a hot dock occurs, the first
AC'97 codec 82 becomes effective, and analog component 2 of the notebook personal computer is used.

As a result, when the analog component 23 of the docking station is used due to the occurrence of a hot dock, it is necessary to initialize the AC'97 codec (2.0) 24 by software.

Further, since the analog component 23 of the docking station is recognized as a new sound function different from the analog component 2 of the notebook computer, two sound circuits exist in the dock state.

In such a dock state, it is necessary to perform processing by software so as not to use the analog component 2 of the notebook personal computer. Further, when a hot undock occurs, the analog component 23 of the docking station is also set in advance by software in advance.
, And a process that uses the analog component 2 of the notebook computer is required.

The present invention has been made in view of such circumstances, and aims to share the AC'97 controller and to easily switch the analog components of the notebook personal computer and the docking station by hardware. It is possible to provide an AC'97 hot dock system and a switching method thereof.

[0035]

An AC 'according to claim 1 is provided.
The 97 hot dock system is a first AC'97 that performs digital conversion of audio signals and analog conversion of audio data.
A first analog component having a codec, a second AC'97 codec that performs digital conversion of an audio signal and analog conversion of audio data, and is connected to a second docking connector via a fourth AC link; Conversion between digital sound data and serial data, the first analog component having
Alternatively, an AC'97 controller for setting the register of the second AC'97 codec, and connection to the AC'97 controller, the first AC'97 codec, and the first docking connector via the first to third AC links. And
A docking bridge for switching the first or second analog component connected to the AC'97 controller in response to a detection signal for detecting connection of the first and second docking connectors. Also,
The docking bridge is connected to the first AC link and has a register space defined in AC'97, and the first or the second A by the AC'97 controller.
A data register for storing the register setting of the C'97 codec, a write master for outputting a control signal and register setting for performing switching control based on the detection signal, and a write master for the write master via the fifth AC link A first selector for selectively connecting the first or fifth AC link to the second AC link in response to the output of the control signal, and a fifth AC link to the write master. And a third A according to the output of the control signal.
A second selector for selectively connecting the first or fifth AC link to the C link may be provided. The first selector connects the first AC link to the second AC link when the control signal is not output, and connects the second AC link to the second AC link when the control signal is output. , The fifth AC link is connected, and the second selector connects the fifth AC link to the third AC link when the control signal is not output, and outputs the control signal. , The third AC link may be connected to the first AC link. AC'97 (main) and docking bridge
It can be configured as one chip. 6. The method for switching an AC'97 hot dock system according to claim 5, wherein the first analog component comprises a first analog component.
A first step of performing digital conversion of an audio signal and an analog conversion of audio data by a C'97 codec, and a digital conversion of an audio signal and an analog conversion of audio data by a second AC'97 codec of a second analog component. Performing the second step and connecting the first docking connector and the second docking connector, thereby connecting the fifth AC link and the second AC'97 codec to the fourth AC link. And a docking bridge, wherein the first and second docking connectors are connected in response to a detection signal for detecting connection of the first and second docking connectors.
And a fourth step of switching the connection of the second or third and fourth AC links, and digital sound data by the AC'97 controller via the AC link connected in the fourth step. A fifth step of performing conversion with serial data and controlling the first or second AC'97 codec, and connecting the second to fourth AC links in accordance with the detection signal by a docking bridge. And setting a register of the first and second AC'97 codecs through the sixth step. In addition, the sixth step may include a seventh step of storing register settings of the first and second AC'97 codecs obtained through the first AC link. . The sixth step includes a step of outputting a control signal for performing switching control based on the detection signal, and an eighth step of outputting the register setting via a fifth AC link. Can be included. In the AC'97 hot dock system and its switching method according to the present invention, the first to fourth A
The first A of the first analog component to the AC'97 controller via the C link and docking bridge
The C'97 codec or the second AC'97 codec of the second analog component is connected, and the docking bridge connects AC'97 in response to a detection signal for detecting connection of the first and second docking connectors.
97 switching of the first or second analog component connected to the controller.

[0036]

Embodiments of the present invention will be described below. In the drawings described below, the same parts as those in FIGS. 5 and 6 are denoted by the same reference numerals.

FIG. 1 is a block diagram showing a first embodiment of the AC'97 hot dock system of the present invention, and FIG.
FIG. 3 is a block diagram showing details of the docking bridge of FIG. 1, and FIG. 3 is a diagram for explaining the operation of the AC'97 hot dock system of FIG.

The AC'97 hot dock system shown in FIG. 1 includes an AC'97 sound circuit 1 and an analog component 3.

The AC'97 sound circuit 1 is provided in a notebook computer or the like as a main system, and provides a sound function such as sound reproduction / recording. A
The C'97 sound circuit 1 includes an analog component 2, a docking bridge 4, and an AC'97 controller 7.

The analog component 2 as the first analog component is provided on the main system. Analog component 2 includes a first AC ′
97 codec 82, microphone 92 and speaker 102
It has.

The first AC'97 codec 82 performs digital-analog conversion or analog-digital conversion. The first AC'97 codec 82 is
It is connected to the docking bridge 4 via an AC link (main) 62 as a link. The microphone 92 captures sound. The speaker 102 emits a sound.

The docking bridge 4 switches analog components connected to the AC'97 controller 7. That is, switching between the analog component 2 and the analog component 3 is performed.

The docking bridge 4 is connected to the A via an AC link (controller) 61 as a first AC link.
It is connected to the C'97 controller 7. The docking bridge 4 is connected to the first docking connector 5 via an AC link (sub) 63 as a third AC link.
a.

When an AC link (controller) 61 and an AC link (main) 62 are connected to the docking bridge 4, the analog component 2 on the main system is used. When the AC link (controller) 61 and the AC link (sub) 63 are connected,
An analog component 3 on the subsystem is used.

Here, regarding the clock of each of the AC links 61, 62 and 63, the first AC'97 codec 8 which is always present is used in order to avoid a synchronization deviation due to switching.
Two clocks are used.

Further, the docking bridge 4 detects the connection of the analog component 3 on the subsystem based on the detection signal 11 output by the connection of the docking connectors 5a and 5b.

On the other hand, the analog component 3 as a second analog component is provided on a subsystem such as a docking station for adding an extended function by docking with a notebook personal computer.

The analog component 3 has a second A
C'97 codec 83, microphone 93 and speaker 1
03. The second AC'97 codec 83
Is an AC link (sub) 63 as a fourth AC link
a to the second docking connector 5b.

The analog component 3 on the subsystem includes the first and second docking connectors 5
When a and 5b are docked, they are connected to the docking bridge 4. At this time, docking bridge 4
Switches the analog component connected to the AC'97 controller 7 from the analog component 2 to the analog component 3. Thus, the analog component 3 becomes an analog component controlled by the AC'97 controller 7.

Next, details of the docking bridge 4 are shown in FIG.

The docking bridge 4 includes a data register 12, a write master 13, a selector 14, and a selector 1.
5 is provided.

The data register 12 is connected to an AC link (controller) 61. Data register 12
Has a register space defined by AC'97, and FIG.
The register settings of the AC'97 codecs 82 and 83 issued by the AC'97 controller 7 are stored. Also,
Each register also has a valid bit for recording that writing has been performed.

The selector 14 as the first selector is
When the dock signal 16 as the control signal is not output, the AC link (controller) 61 is connected to the AC link (main) 62. When the dock signal 16 is being output, an AC link (setting) 64 as a fifth AC link is connected.

The selector 15 as the second selector is
When the dock signal 16 is not output, an AC link (setting) 64 is connected to the AC link (sub) 63. When the dock signal 16 is output, the AC link (controller) 61 is connected.

The selector 15 receives the detection signal 11. When the detection signal 11 is not output, the selector 15 electrically disconnects the AC link (sub) 63.

The write master 13 outputs a dock signal 16 for controlling the selector 14 and the selector 15 based on the detection signal 11. When the detection signal 11 is output, the write master 13 operates as a master of the AC link (setting) 64.

Thus, the contents of the data register 12 are stored in the AC link (main) 62 or the AC link (sub) 63.
Output to That is, if the AC link (main) 62 is connected, the signal is output to the first AC'97 codec 82 of FIG. 1, and if the AC link (sub) 63 is connected, the second AC'97 codec is output. 83.

At this time, the cycle by the write master 13 is only writing to the register specified in AC'97, and does not transmit / receive sound data. for that reason,
Slot 0 to slot 2 required for register data transfer
The transfer frame ends with.

Thereafter, by starting a new frame again, register setting is performed at a higher speed than in a normal AC link cycle. At the same time, for a register for which writing has been completed, the valid bit of that register is cleared.

Next, the operation of the AC'97 hot docking system having such a configuration will be described with reference to FIG.
FIG. 3 is a state transition diagram of the AC'97 hot dock system.

In the initial state S0, all components in the AC'97 hot dock system are placed in the initial state. When the AC link (controller) 61 in FIG. 1 is reset, transitions T10, T20, and T30 to the initial state S0 are performed in any state.

Thereafter, the presence of the analog component 3 on the subsystem is checked by the detection signal 11 inside the docking bridge 4 of FIG.

At this time, when the detection signal 11 is output, the dock state S1 is established. Write master 1 of FIG.
3 outputs the dock signal 16, and the dock state S1
Is made T01. If the detection signal 11 is not output, the state is the undock state S2. At this time,
The dock signal 16 is not output, and the transition T02 to the undock state S2 is performed.

In the dock state S1, the analog component 3 on the subsystem of FIG. 1 is connected via the second docking connector 5b, and the detection signal 11 is output. At this time, when the dock signal 16 is output from the write master 13 inside the docking bridge 4, the AC link (controller) 61 connects the selector 15.
Is connected to the AC link (sub) 63.

At the time of sound reproduction, digital sound data to be reproduced is converted into serial data by the AC'97 controller 7 and output to the AC link (controller) 61.

This is performed via the docking bridge 4 and AC
Output to the link (sub) 63. The second AC'97 codec 83 of the analog component 3 performs digital-to-analog conversion on this, and reproduces it through the speaker 103.

At the time of sound recording, the microphone 93
Is converted from analog to digital by the second AC'97 codec 83. The digitally converted data is input to the AC'97 controller 7 via the docking bridge 4 and becomes digital sound data to be recorded. Thus, in the dock state S1, the analog component 3 on the subsystem is used.

The output of the dock signal 16 causes the write master 13 to start operating. At this time, AC of FIG.
An AC link (main) 62 is connected to the link (setting) 64 by the selector 14, and the changed register of the data register 12 is connected to the first AC'97 codec 8.
2 is output.

The register write by the AC'97 controller 7 is effective for the data register 12 inside the docking bridge 4 simultaneously with the second AC'97 codec 83. Therefore, the data register 12 stores the second A
This is a register copy of the C'97 codec 83. That is, the contents of the register of the second AC'97 codec 83 are copied to the first AC'97 codec 82, and the settings are kept equal. As a result, the dock state S1
In this case, the analog component 2 on the main system is not used, and is always kept in the same state as the analog component 3 on the subsystem.

In the dock state S1, when the docking connectors 5a and 5b are disconnected and the analog component 3 on the subsystem is removed, hot undock occurs. At this time, since the output of the detection signal 11 stops inside the docking bridge 4, the operation of the write master 13 ends, and the output of the dock signal 16 also stops. Thereby, transition T12 to the undock state S2 is performed.

In the undock state S2, the analog component 3 on the subsystem does not exist, and the detection signal 11
Is not output. In the docking bridge 4, the dock signal 16 from the write master 13 is not output,
The link (controller) 61 is set to A
Connected to C link (main) 62. As a result, in the undock state S2, the analog component 2 on the main system is used.

The AC link (sub) 63 is disconnected by the selector 15 because the detection signal 11 is not output. At this time, the write master 13 does not operate.
However, similarly to the dock state S1, register writing by the AC'97 controller 7 is also effective for the data register 12.

In this case, the register setting of the first AC'97 codec 82 is copied to the data register 12. As a result, in the undock state S2, the settings of the analog component 2 on the main system are stored in the docking bridge 4.

When the analog component 3 on the subsystem is connected in the undock state S2, a hot dock occurs, and the transition T2 to the hot dock state S3 occurs.
3 is performed. At this time, when the analog component 3 on the subsystem is connected, the detection signal 11
Is output.

In the docking bridge 4, the write master 13 starts operating. AC link (setting)
64 is connected to the AC link (sub) 63 by the selector 15. The write master 13 outputs the changed register of the data register 12 to the second AC'97 codec 83.

Since the data register 12 in the undock state S2 is a register copy of the first AC'97 codec 82, in this case, the first AC'97
Second AC'97 Codec 8 from Codec 82
3 is the register copy.

As a result, the setting of the second AC'97 codec 83 becomes equal to the setting of the first AC'97 codec 82. During this time, since the dock signal 16 is not output, the analog component 2 on the main system can be used similarly to the undock state S2.

When all the valid bits are cleared and the register copy is completed, the write master 13 outputs a dock signal 16. This indicates a transition T31 to the dock state S1. As a result, in the hot dock state S3, the analog component 3 on the subsystem is set by the docking bridge 4 to a state equal to the analog component 2 on the main system.

As described above, in the first embodiment, AC
Link (controller) 61, AC link (main) 6
2. The first AC'97 codec 82 of the analog component 2 is supplied to the AC'97 controller 7 via the AC link (sub) 63, 63a and the docking bridge 4.
Alternatively, the second AC'97 codec 83 of the analog component 3 is connected, and the first and second docking connectors 5a, 5
analog component 2 or 3 connected to the AC'97 controller 7 in response to a detection signal for detecting the connection
Since the AC'97 controller 7 is shared, the analog component 2 on the main system and the analog component 3 on the subsystem can be easily switched by hardware.

In the first embodiment, even when the analog component 2 is in use, the setting of the analog component 3 is performed by the docking bridge 4, so that hot docking is possible and hot undock occurs. However, since the analog component 2 is always kept in the same state as the analog component 2, it can be used immediately.

(Second Embodiment) FIG.
It is a block diagram which shows 2nd Embodiment of C'97 hot dock system.

The AC'97 sound circuit 17 of the AC'97 hot dock system shown in FIG.

The AC'97 bridge 18 is formed as a single chip by incorporating the docking bridge 4 of FIG. 1 into the first AC'97 codec 82. AC'9
For 7 codec chips, there are pins that can be used freely by each chip manufacturer. The AC link (sub) 63 and the detection signal 11 are allocated to the AC'97 bridge 18 using these pins.

In such a configuration, the data register 12 inside the docking bridge 4 in FIG.
The AC'97 bridge 18 operates to maintain the same settings as the registers of the AC'97 codec 82 of
These two registers can be integrated.

Further, since the AC'97 bridge 18 is made into one chip by incorporating the docking bridge 4 into the first AC'97 codec 82, the number of chips can be reduced and the mounting area can be reduced. The effect that the size can be reduced can also be obtained.

[0086]

As described above, according to the AC'97 hot dock system and the switching method thereof according to the present invention,
Via a fourth AC link and docking bridge, A
The first AC'97 codec of the first analog component or the second AC'97 codec of the second analog component is connected to the C'97 controller, and the first and second AC'97 codecs are connected by a docking bridge.
1 or 2 connected to the AC'97 controller according to a detection signal for detecting the connection of the docking connector of
Since the analog components are switched, the AC'97 controller is shared,
The hardware makes it easy to switch between the first analog component on the main system and the second analog component on the subsystem.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of an AC'97 hot dock system of the present invention.

FIG. 2 is a block diagram showing details of a docking bridge of FIG. 1;

FIG. 3 is a diagram for explaining the operation of the AC'97 hot dock system of FIG. 1;

FIG. 4 is a block diagram showing a second embodiment of the AC'97 hot dock system of the present invention.

FIG. 5 is a block diagram showing an example of a conventional AC'97 hot dock system.

FIG. 6 is a block diagram showing another example of the conventional AC'97 hot dock system.

[Explanation of symbols]

 Reference Signs List 1 AC'97 sound circuit 2 Analog component 3 Analog component 4 Docking bridge 5a First docking connector 5b Second docking connector 7 AC'97 controller 11 Detection signal 12 Data register 13 Write master 14, 15 Selector 16 Dock signal 17 AC '97 sound circuit 18 AC'97 bridge 19 AC'97 sound circuit 20 Selector 21 Select signal 22 AC'97 sound circuit 23 Analog component 24 AC 'codec (2.0) 61 AC link (controller) 62 AC link (main) 63, 63a AC link (sub) 64 AC link (setting) 82 First AC'97 codec 83 Second AC'97 codec 92,93 Microphone 102, 03 speaker

Claims (7)

[Claims] 1. A first analog component having a first AC'97 codec for performing digital conversion of an audio signal and analog conversion of audio data, and performing digital conversion of an audio signal and analog conversion of audio data, A second analog component having a second AC'97 codec connected to a second docking connector via a fourth AC link, converting between digital sound data and serial data, and converting the first or second An AC'97 controller for setting the register of the AC'97 codec, and an AC'97 controller, the first AC'97 codec, and a first docking connector connected via first to third AC links. , The AC ′ in response to a detection signal for detecting connection between the first and second docking connectors. AC'97 Hot Dogs system characterized in that it comprises 7 a docking bridge for switching of the first or second analog component connected to the controller. 2. The docking bridge is connected to the first AC link and has an AC'9
7, a data register for storing the register setting of the first or second AC'97 codec by the AC'97 controller, and for performing switching control based on the detection signal. A write master that outputs a control signal and the register setting; a write master connected to the write master via a fifth AC link; and a first or a second AC link corresponding to the output of the control signal. A first selector for selectively connecting a fifth AC link; and a first selector connected to the write master via a fifth AC link, and to the third AC link in accordance with an output of the control signal. The AC'97 hot dock system according to claim 1, further comprising a second selector for selectively connecting the first or fifth AC link. 3. The first selector, when the control signal is not output, outputs a signal to the second AC link.
When the first AC link is connected and the control signal is output, the fifth AC link is connected to the second AC link.
The second selector connects the fifth AC link to the third AC link when the control signal is not output.
When the link is connected and the control signal is output,
The AC'97 according to claim 2, wherein the first AC link is connected to the third AC link.
Hot dock system. 4. The AC ′ according to claim 1, wherein the first AC'97 codec and the docking bridge have a one-chip configuration.
97 hot dock system. 5. A first step of performing a digital conversion of an audio signal and an analog conversion of audio data by a first AC'97 codec of a first analog component, and a second AC'97 of a second analog component. A second step of performing digital conversion of an audio signal and analog conversion of audio data by a codec, and connecting the first docking connector and the second docking connector to connect the fourth AC link to the fifth AC link. The third connecting the second AC'97 codec
And the docking bridge connects the first AC link to the second or third and fourth AC links in response to a detection signal for detecting the connection between the first and second docking connectors. A fourth step of switching; and AC ′ via the AC link connected in the fourth step.
A fifth step of converting the digital sound data and the serial data by the 97 controller and controlling the first or second AC'97 codec; Via the second to fourth AC links, the first and second A
And a sixth step of setting a register of the C'97 codec. 6. The method according to claim 6, wherein the sixth step includes a seventh step of storing register settings of the first or second AC'97 codec obtained via the first AC link. The method for switching an AC'97 hot dock system according to claim 5, characterized in that: 7. The method according to claim 6, further comprising: outputting a control signal for performing switching control based on the detection signal; and outputting the register setting via a fifth AC link. 6. The method for switching an AC'97 hot dock system according to claim 5, further comprising the steps of: