KR101978768B1 - Repeater device for displayport and link training method thereof - Google Patents

Abstract

A repeater apparatus of a display port type and a link training method thereof are provided. The repeater apparatus according to the present invention includes an adaptive equalizer for determining a quality of a data signal input through a main link and adjusting a quality of the data signal, a demodulator for receiving the data signal from the adaptive equalizer, A main controller for controlling the operation of the adaptive equalizer and the main link transmitter, a supplemental channel controller for controlling a link training operation for optimizing the transmission of the data signal through the main link, And a hot plug detector (HPD) controller for initializing the link training operation.
Accordingly, the repeater apparatus according to the present invention may include a control unit for controlling the link training to sufficiently perform channel compensation between the sink apparatus and the repeater apparatus, as well as sufficient channel compensation between the source apparatus and the repeater apparatus, The quality of a signal transmitted in a port manner can be improved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repeater device of a display port type and a link training method thereof.

The present invention relates to a display port type repeater apparatus, and more particularly, to a display port type repeater apparatus including a control unit for link training between a source apparatus and a sink apparatus, and a link training method therefor.

Recently, a high-resolution display interface has been developed in accordance with the development of image technology. Currently, next-generation display technologies such as UHD and 3D display are emerging in various ways.

Interfaces such as low voltage differential signaling (LVDS), high definition multimedia interface (HDMI) and display port (DisplayPort) are mainly used as the interface of the next generation display.

Among them, the DisplayPort interface is an interface defined by the Video Electronics Standards Association (VESA), which can connect an internal connection between a chip and a chip, as well as an external connection between a product and a product. Technology.

In general, the DisplayPort interface is used to provide video and / or audio signals from a source device such as a computer, a digital video disk (DVD) player or a digital video recorder (DVR) to a sink, such as a television, home theater system, .

A data transmission system that transmits data using the display port interface method uses a main link and an auxiliary channel (AUX-CH) for communication between a source device and a sink device do.

The source and sink devices optimize data transmission over the main link using a different set of parameters depending on distance. This process is referred to as link training. Link training changes the bit-rate (BR), pre-emphasis (PE) level and output swing of the source device for channel compensation between the source device and the sink device, setting for link negotiation. This link training is achieved through communication between the source device and the sink device via the supplemental channel of the source device and the sink device.

On the other hand, there is a case where a repeater is arranged between a source device and a sink device in order to reconfigure data transmitted through a main link so that the main link can transmit video and / or audio data to a remote location. That is, the repeater device reconstructs the data transmitted over the main link so that the main link can transmit at a greater distance without degradation of the video and / or audio data.

However, a general repeater device may only have a re-driving function for signal processing on the main link at the time of link training, or it may be a pre- Channel compensation is possible by adjusting Ampathis.

Accordingly, when link training is performed, sufficient channel compensation is performed only for the channel between the repeater device and the sink device, and channel compensation between the source device and the repeater device is channel compensated only by an equalizer inside the repeater device And the pre-emphasis of the source device operate only at default values, so that there is a problem that sufficiently optimized channel compensation is not performed.

Of course, a link layer logic for channel compensation between the source device and the repeater device is implemented in the repeater device, and a link layer logic for channel compensation between the repeater device and the sink device is implemented. However, There is a problem that the chip size of the repeater apparatus becomes large and the manufacturing cost rises.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a display port type repeater apparatus capable of performing sufficient channel compensation between a repeater apparatus and a sink apparatus, and between a source apparatus and a repeater apparatus, and a link training method therefor.

Further, a problem to be solved by the present invention is to enable sufficient channel compensation between the source device and the repeater device without implementing a complete link layer logic in the repeater device, thereby reducing the chip size of the repeater device, A display port type repeater device and a link training method thereof.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a repeater comprising: an adaptive equalizer for determining a quality of a data signal input through a main link and adjusting a quality of the data signal; A main link transmitter for receiving the data signal from the adaptive equalizer and outputting the data signal through the main link, a main controller for controlling the operation of the adaptive equalizer and the main link transmitter, A supplemental channel controller for controlling link training operation for optimization and a hot plug detector (HPD) controller for initiating a link training operation.

The adaptive equalizer may include a signal quality determiner for determining the quality of the data signal and an equalizer for adjusting the quality of the data signal to improve the quality of the data signal under the control of the main controller.

The main link transmitter can adjust the pre-emphasis and voltage swing size of the data signal.

The hot plug detector controller may initialize the source device to resume link training.

The repeater device includes first and second auxiliary channel transceivers for transmitting and receiving the link training related data to and from the source device and the sink device through a supplemental channel, a hot plug detector signal for detecting a hot plug detector signal to determine whether the sink device is connected, Detector and a hot plug detector signal generator for generating a fake hot plug detector signal and outputting the hot plug detector signal to the source device.

The link training method according to an embodiment of the present invention includes the steps of outputting a hot plug detector signal to a source device when a hot plug detector (HPD) signal of a sink device is detected, Performing a first link training to find a channel condition, and performing a second link training to find an optimal channel condition of the sink device and the repeater device.

Performing the first link training comprises: manipulating the highest bit rate information among display identification data received from the sink device; performing CR training in accordance with the highest bit rate information; failing the CR training, Requesting a voltage swing and a pre-emphasis change of an output signal, performing EQ training when CR training is completed by voltage swing and pre-emphasis, receiving a data signal when EQ training is completed, Generating and outputting a turn off signal of the hot plug detector signal, and generating and outputting a fake hot plug detector signal after a predetermined time to initialize the source device to restart link training .

The first link training method may be repeated until an optimal voltage swing size and pre-emphasis value between the source device and the repeater device is recorded.

Performing the second link training comprises transmitting the display identification data and the display port configuration data of the sink device to the source device, performing CR training according to the display identification data and the display port configuration data, The channel between the sink device and the repeater device is set by operating the voltage swing and the pre-emphasis of the main link output signal of the repeater device to a value desired by the sink device, and a channel between the source device and the repeater device is set Setting the voltage swing and pre-emphasis of the main link output signal of the source apparatus to an optimum value obtained through the first link training, and performing EQ training when the CR training is completed.

The details of other embodiments are included in the detailed description and drawings.

The present invention may include a supplemental channel controller for channel compensation within the repeater device so that sufficient channel compensation between the source device and the repeater device can be achieved.

The present invention determines the quality of the signal transmitted between the source device and the repeater device and controls the turn-on or turn-off of the hot plug detector (HPD) signal until the signal quality is satisfied, Can be achieved.

The present invention improves the quality of a data signal transmitted in a display port scheme by performing channel compensation through link training between a source device and a sink device after sufficient channel compensation is performed between the source device and the repeater device.

Further, the present invention does not require a large increase in the chip size of the repeater device for optimal link training, thereby reducing the manufacturing cost of the repeater device.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the specification.

1 is a block diagram schematically showing a data transmission system of a display port system according to an embodiment of the present invention.
2 is a block diagram schematically showing a configuration of a repeater apparatus according to an embodiment of the present invention.
3 is a flowchart illustrating a link training method of a repeater according to an exemplary embodiment of the present invention.
4 is a view sequentially illustrating the first link training method of FIG.
FIG. 5 is a view sequentially illustrating the second link training method of FIG. 3. FIG.

Various embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Specific examples and arrangements in devices are described for the purpose of simplifying the present invention. These are merely examples and are not to be construed in a limiting sense. Further, the present invention repeats the drawing identification numbers and / or characters in various examples. Such repetition is used for the sake of simplicity and clarity, and is not intended to be limited to the relationship between the various embodiments and / or configurations discussed.

In addition, throughout the specification, when an element is referred to as " including " an element, it is to be understood that the element may include other elements, The phrases such as where a component is coupled to another component, coupled to, and / or coupled to, may include embodiments in which two components are directly connected, and in addition, another component may be coupled between two components Such that the two components are not directly connected to each other. Also, it will be understood that, if the terms referring to first, second, etc. may be used herein to describe various components, the components are not intended to be limited to these terms. Only these terms are used to distinguish one component from another.

1 is a block diagram schematically showing a data transmission system of a display port system according to an embodiment of the present invention.

1, a data transmission system 1000 according to an exemplary embodiment of the present invention includes a source apparatus 100, a repeater apparatus 200, and a sink apparatus 300, and may be a display port interface system .

The data transmission system 1000 of the display port interface scheme may have two transmission channels, i.e., a secondary channel and a main link.

The auxiliary channel is a bi-directional communication that transmits a data signal for setting or configuring the main link between the source apparatus 100 and the sink apparatus 300, or transmits data for controlling the source apparatus 100 or the sink apparatus 300 Link. The supplemental channel is also used for link training for initial link matching between source device 100 and sink device 300. [ In particular, the source device 100 may use the supplemental channel to verify the validity and status of the main link and implement modifications to the main link using the supplemental channel. In other words, the auxiliary channel can be used to establish and maintain the main link connection.

The main link is a unidirectional communication channel for transmitting a data signal from the source apparatus 100 to the sink apparatus 300. For example, the main link may consist of one, two, or four data pairs, commonly referred to as " lanes ".

Meanwhile, the source apparatus 100 of the data transmission system 1000 according to an exemplary embodiment of the present invention is an apparatus for transmitting video and / or audio-related data signals, for example, a digital video recorder (DVR) A disk player (DVD), a computer, a hard drive, or other storage device including video and / or audio data. The source apparatus 100 starts communication with the sink apparatus 300 and transmits the data signal to the sink apparatus 300. [ Although not shown, the source device 100 may include a stream source, a link policy maker, and a stream policy maker. Here, the link policy maker is used to initialize, configure and maintain the link, and the stream policy maker is used to initialize and manage stream video and audio data signal transmission.

The repeater device 200 is disposed between the source device 100 and the sink device 300 when the source device 100 and the sink device 300 are disposed at a distance from each other, Even if the distance between the sink device 300 and the sink device 300 is large. In more detail, the repeater apparatus 200 receives a data signal transmitted from the source apparatus 100 through a main link, equalizes the received data signal, and transmits the same to the sink apparatus 300 through the main link. Herein, this process is referred to as link training when data signals between the source apparatus 100 and the sink apparatus 300 are transmitted and received using different sets of parameters to optimize data transmission through the main link. More specifically, the link training is referred to as bit rate (hereinafter referred to as 'BR') for channel compensation between the source apparatus 100 and the repeater apparatus 200 and between the repeater apparatus 200 and the sink apparatus 300 ), Pre-emphasis (hereinafter referred to as 'PE') level, and voltage swing (hereinafter referred to as 'Vp2p') to find the optimal setting (link negotiation). This link training is performed using a supplemental channel.

In order to efficiently perform such link training, the repeater apparatus 200 according to an embodiment of the present invention includes a supplementary channel controller, a signal quality determination unit, and a hot plug decoder (HPD) Controller to provide sufficient channel compensation between the source device 100 and the repeater device 200. Here, the HPD (Hot Plug Detector) informs the connection status of the source device 100 and the sink device 300. [ The detailed configuration of the repeater device 200 will be described with reference to FIG.

Sink device 300 may be a device that receives a data signal, for example, a television (TV), a computer monitor, a home theater system, or other device that receives video and / or audio data signals. Although not shown, the sink device 300 is provided with a link policy maker, a stream policy maker, display identification data (EDID), display port configuration data Quot;). ≪ / RTI > Here, the DPCD stores the configuration and state of the currently configured main link in a specific memory address, and the EDID stores the performance of the sink device 300. [

2 is a block diagram schematically illustrating a configuration of a display port type repeater apparatus according to an embodiment of the present invention.

Referring to FIG. 2, a repeater apparatus 200 according to an exemplary embodiment of the present invention includes an adaptive equalizer 210, a main link transmitter 220, a controller 230, a first auxiliary channel transceiver 240, 2 auxiliary channel transceiver 250, a hot plug detector (HPD) signal generator 260, and an HPD signal detector 270. [

The adaptive equalizer 210 can determine the quality of the data signal input from the source device 100 via the main link and adjust the quality of the data signal. The adaptive equalizer 210 may include an equalizer 211 and a signal quality determiner 212.

The equalizer 211 adjusts the quality of the data signal so that the quality of the data signal is improved. The equalizer 211 may be controlled by the controller 230 that generates the control signal according to the signal quality of the signal quality determiner 212.

The signal quality determination unit 212 determines the quality of the data signal input through the main link, and records the determination result.

The main link transmitter 220 receives the data signal from the adaptive equalizer 210 and transmits the data signal to the sink device 230 via the main link. The main link transmitter 220 can adjust the size of PE and Vp2p of the data signal during link training between the source apparatus 100 and the sink apparatus 300. [ For example, if the lock of the clock recovery (CR) signal fails during link training between the source apparatus 100 and the sink apparatus 300, the sink apparatus 300 And the main link transmitter 220 can adjust the size of the sink device 300 to the desired Vp2p and PE.

The control unit 230 controls the reception and transmission operation of the data signal transmitted through the main link or the link between the source apparatus 100 and the repeater apparatus 200 and the repeater apparatus 200 and the sink apparatus 300 via the auxiliary channel, It is possible to control the training operation. The controller 230 may include a main controller 231, an auxiliary channel controller 232, and an HPD controller 233. [

The main controller 231 controls the overall operation of the repeater apparatus 200. In particular, the main controller 231 may control the operation of the adaptive equalizer 210 and the main link transmitter 220. More specifically, the main controller 231 receives the quality determination result of the data signal input through the main link from the signal quality determination unit 212, and controls the operation of the equalizer 211. The sink device 300 ), And controls the PE and Vp2p in the main link transmitter 220 when it is necessary to adjust the PE and Vp2p.

Auxiliary channel controller 232 controls overall link training operations to optimize the transmission of data signals over the main link. The auxiliary channel controller 232 is a transparent mode in which only the information requested from the source apparatus 100 is transmitted to the sink apparatus 300 during the link training operation and a response to the information requested from the source apparatus 100 is transmitted to the sink apparatus 300. [ A sink blocking mode in which the sink device 300 is shut off and the operation mode in which the response of the sink device 300 to the information requested from the source device 100 is transmitted to the source device 100, 200 to operate.

The HPD controller 233 controls the generation and the output of the HPD signal for initiating the link training operation when the HPD signal is detected from the sink device 300. Particularly, the HPD controller 233 judges the quality of the data signal and recognizes that the source device 100 has turned off the HPD signal even if the HPD signal of the sink device 300 is turned on to set the optimal Vp2p and PE To generate a fake HPD signal so that the fake HPD signal can be generated. That is, the fake HPD signal may be a signal to initialize source device 100 to perform link training again.

The first auxiliary channel transceiver 240 transmits and receives a link training related data signal through a supplemental channel between the source device 100 and the repeater device 200.

The second auxiliary channel transceiver 250 transmits and receives link training related data through a supplemental channel between the repeater 200 and the sink device 300.

The HPD signal generator 260 generates an HPD signal to be transmitted to the source apparatus 100 when an HPD signal is detected from the sink apparatus 300. The HPD signal generator 260 can generate a fake HPD signal under the control of the HPD controller 233. [

The HPD detector 270 can detect an HPD signal from the sink device 300 that can determine whether the sink device 300 is connected.

The repeater device 200 of the display port type according to an embodiment of the present invention includes a controller 230 including a main controller 231, an auxiliary channel controller 232 and an HPD controller 233, Sufficient channel compensation between the source apparatus 100 and the repeater apparatus 200 as well as sufficient channel compensation between the apparatus 200 and the sink apparatus 300 can be ensured.

The display port type data transmission system according to an embodiment of the present invention, particularly the link training method of the repeater apparatus, will be described in more detail with reference to FIGS.

3 is a flowchart illustrating a link training method of a repeater according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the link training of the repeater apparatus 200 according to an embodiment of the present invention is performed such that, when the HPD signal of the sink apparatus 300 is detected (S310), the repeater apparatus 200 generates an HPD signal And outputs the generated HPD signal to the source apparatus 100 (S320).

Thereafter, a first link training for sufficient channel compensation between the source apparatus 100 and the repeater apparatus 200 is performed (S330), and the source apparatus 100 and the sink apparatus 300 perform the first link training, A second link training for sufficient channel compensation is performed (S340).

The number of lanes to be used and the bit rate (BR) to be used in the display port type data transmission system is determined by the link training between the source device 100 and the sink device 300 Is determined by the negotiation between the sink device 300 and the source device 100 of the second link training result. At this time, the repeater apparatus 200 can determine whether the source device 100 and the repeater device 200 are in a state where the source device 100 is connected to the repeater device 200 in advance, in order to allow sufficient compensation for the channel between the source device 100 and the repeater device 200, It is possible to find optimum source device setting conditions for all lanes and all bit rates for the channel between the source device 100 and the repeater device 200. Thus, The process of finding the source device setting condition may be referred to as a first link training. In order to perform the first link training, the repeater 200 controls the source device 100 using the HPD signal and the DPCD information manipulation, while performing link training on all possible cases of Vp2p and PE, The signal quality is judged to determine the optimum Vp2p and PE for each lane.

A more detailed method of the first link training among the link training methods of the repeater apparatus 200 will be described with reference to FIG.

4 is a view sequentially illustrating the first link training method of FIG.

Referring to FIG. 4, when a first link training is started, a request for Extended Display Indication Data (EDID) information is received from the source device 100 (S3301) and transmitted to the sink device 300. FIG.

Thereafter, when the repeater 200 receives the EDID information response from the sink device 300, the repeater 200 manipulates the highest receivable bit rate information among the received EDID information (S3302). Then, the repeater 200 transmits the EDID information, 100) (S3303).

Thereafter, the repeater 200 receives the DPCD information request from the source device 100 and transfers the DPCD information request to the sink device 300, and when receiving the DPCD information response from the sink device 300, the repeater device 200 transfers the DPCD information request to the source device 100 S3304).

Thereafter, the CR pattern signal is received from the source apparatus 100 (S3305). At this time, the received CR pattern signal may be the lowest level Vp2p and the lowest level PE.

Since the CR pattern signal is received at the lowest level of Vp2p and PE, the repeater device 200 determines that the CR lock has failed (S3306) And sends the answer to the source device 100 to change to another level of Vp2p and PE (S3307).

After repeating the process, the repeater device 200 transmits an answer signal indicating that the CR lock is successful to the source device 100 (S3309) when receiving a CR lock answer request from the source device 100 (S3308).

Thereafter, the repeater device 200 receives the EQ pattern signal from the source device 100 (S3310) and receives an EQ done answer signal indicating whether the EQ process has been completed from the source device 100 after a predetermined time (S3311).

Thereafter, when the repeater apparatus 200 transmits an EQ done answer signal (S3312), the repeater apparatus 200 receives the data signal from the source apparatus 100 (S3313).

The repeater device 200 determines and records the signal quality of the received data signal (S3314), and generates / outputs the HPD turn-off signal (S3315). However, it is because the repeater device 200 generates and outputs the HPD turn-off even though the first link training is not completed because it is determined that the first link training is completed in the context of the source device 100.

However, the source apparatus 100 and the repeater apparatus 200 can continue to perform the first link training until an optimal channel condition between the source apparatus 100 and the repeater apparatus 200 is found. Accordingly, even if the HPD turn-off signal is generated and output in step 3315, the first link training may not be completely completed.

Thereafter, the repeater apparatus 200 generates an HPD turn-on signal for starting the first link training to find the optimal Vp2p and PE for all the bit rates BR, and outputs it to the source apparatus 100 (S3316). At this time, the generated HPD turn-on signal may be a fake HPD signal.

In addition, the HPD turn-off signal and the HPD turn-on signal in steps 3315 and 3316 may be a fake HPD signal. The fake HPD signal initializes the source device 100 to find the optimum channel condition between the source device 100 and the repeater device 200 even when the sink device 300 is turned on and performs the first link training several times To deceive the source device 100 in order to do so. That is, the fake HPD signal may be a signal that initializes the source device 100 to resume the first link training.

Thereafter, the repeater apparatus 200 determines whether the signal quality check for all combinations of Vp2p and PE has been completed (S3317). If it is determined that the signal quality check has been completed, the repeater apparatus 200 records the signal quality optimal Vp2p, PE (S3318). If it is determined that the signal quality check for all combinations of Vp2p and PE is not completed, the Vp2p and the PE values to be changed are changed (S3319). While receiving the EDID information request from the source device 100 (S3301) Training is resumed.

It is determined whether or not the first link training for all the bit rates BR is completed after recording the signal quality optimal Vp2p and PE at step S3320. If it is determined that the first link training for all the bit rates BR is completed, When the link training is terminated and it is determined that the first link training for all the bit rates is not completed, the bit rate to be manipulated is changed, and the first link training is performed while receiving the EDID information request from the source apparatus 100 (S3301) It starts again.

By repeating the first link training for all the bit rates in this way, the source device 100 and the repeater device 200 can know the Vp2p and the PE level of the optimal source device 100 for transmitting and receiving data signals .

FIG. 5 is a view sequentially illustrating the second link training method of FIG. 3. FIG.

Referring to FIG. 5, when the repeater apparatus 200 generates and outputs an HPD turn-on signal to the source apparatus 100, the second link training, which is a link training between the source apparatus 100 and the sink apparatus 300, is started.

The source apparatus 100 requests EDID information and DPCD information to the sink apparatus 300 and the sink apparatus 300 makes the source apparatus 100 a response to the EDID information and the DPCD information. At this time, the repeater 200 only transmits EDID information and DPCD information (S3401)

Thereafter, the CR pattern signal received from the source apparatus 100 is transmitted to the sink apparatus 300 (S3402). At this time, the transmitted CR pattern signal may be a combination signal of the lowest level Vp2p and the lowest level PE.

The repeater device 200 transmits a CR lock failure signal to the source device 100 while receiving a request for a CR lock answer from the source device 100 after a predetermined time at step S3403. The source device 100 requests the source device 100 to change the optimal Vp2p and PE level found through the first link training to a level corresponding to the bit rate set by the source device 100 at step S3404.

Thereafter, in S3405, a response to the CR lock request received from the source apparatus 100 is transmitted to the sink apparatus 300 (S3405), and a response to the CR apparatus is received from the sink apparatus 300 in S3406.

The repeater 200 determines whether the CR lock of the sink device 300 has succeeded (S3407). If it is determined that the CR lock is successful, the repeater 200 transmits a CR lock success response to the source device 100 (S3408).

The repeater device 200 receives the Vp2p and PE values requested by the sink device 300 from the sink device 300 when it is determined that the CR lock of the sink device 300 is failed S3409, And applies the requested Vp2p and PE values to the main link transmitter 220 (S3410). That is, the Vp2p and PE levels between the sink device 300 and the repeater device 200 are changed to the values requested by the sink device 300. [ Meanwhile, the repeater apparatus 200 operates the Vp2p and PE values between the source apparatus 100 and the repeater apparatus 200 to the optimum value recorded in the first link training (S3411), and then transmits the CR pattern signal to the sink apparatus 300 (S3402) and restarts the CR training process during the second link training.

When the CR lock success response is transmitted to the source apparatus 100, the repeater apparatus 200 transmits the EQ pattern signal transmitted from the source apparatus 100 to the sink apparatus 300 (S3412).

Whether or not the EQ has been completed from the source apparatus 100 after a predetermined time has elapsed. If an answer request signal is received, the EQ done answer signal is transmitted to the sink device 300 in step S3413. (S3414).

The repeater device 200 receives the Vp2p and PE change values requested by the sink device 300 in step S3416 and determines whether the EQ done is successful or not in step S3415. The Vp2p and the PE level between the sink device 300 and the repeater device 200 are set to the values requested by the sink device 300 by applying the requested Vp2p and PE values to the main link transmitter 220 in step S3417. Meanwhile, the repeater 200 operates the Vp2p and PE values between the source device 100 and the repeater device 200 to the optimum value recorded in the first link training (S3418), and transmits the EQ pattern signal to the sink device 300 ) (S3412) and restarts the EQ training process during the second link training.

On the other hand, if it is determined that the EQ done is successful, the repeater 200 transmits the EQ done answer to the source device 100 (S3419), and the second link training is completed.

As such, in the second link training operation, the repeater device 200 will generally operate in a transparent mode, operating in the operating mode when the CR lock fails, or when the EQ done fails. The channel conditions between the source device 100 and the repeater device 200 can be optimized and the channel conditions between the repeater device 200 and the sink device 300 can be optimized to improve the signal quality of the data signal Can be improved.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those embodiments and various changes and modifications may be made without departing from the scope of the present invention. . Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

1000: Display port type data transmission system
100: source device
200: repeater device
210: adaptive equalizer
211: equalizer
212: signal quality judging unit
220: Main link transmitter
230:
231: Main controller
232: Secondary channel controller
233: HPD controller
240: first auxiliary channel transceiver
250: Secondary channel transceiver
260: HPD signal generator
270: HPD signal detector
300: sink device

Claims (9)

Outputting a hot plug detector signal to a source device when a hot plug detector (HPD) signal of the sink device is detected;
Performing a first link training to find an optimal channel condition between the source device and the repeater device; And
Performing a second link training to find an optimal channel condition of the sink device and the repeater device,
Wherein performing the first link training comprises:
Operating the highest bit rate information among the display identification data received from the sink device;
Performing CR training according to the highest bit rate information;
Requesting a voltage swing and a pre-emphasis change of the main link output signal of the source apparatus by failing the CR training;
Performing EQ training when the CR training is completed with the voltage swing and pre-emphasis;
Determining the quality of the data signal by receiving the data signal when the EQ training is completed;
Generating and outputting a turn-off signal of the hot plug detector signal; And
And generating and outputting a fake hot plug detector signal after a predetermined time to initialize the source device to resume link training. delete The method according to claim 1,
Wherein performing the first link training is repeated until the optimal voltage swing size and pre-emphasis value between the source device and the repeater device is recorded. 2. The method of claim 1, wherein performing the second link training comprises:
Transferring display identification data and display port configuration data of the sink device to the source device;
Performing CR training according to the display identification data and the display port configuration data;
When the CR training fails, a channel between the sink device and the repeater device is set by operating the voltage swing and pre-emphasis of the main link output signal of the repeater device to a value desired by the sink device, Setting a voltage swing and pre-emphasis of a main link output signal of the source apparatus to an optimum value obtained through the first link training; And
And performing EQ training when the CR training is completed. An adaptive equalizer for determining the quality of the data signal input through the main link and adjusting the quality of the data signal;
A main link transmitter for receiving the data signal from the adaptive equalizer and outputting the data signal through the main link;
A main controller for controlling operations of the adaptive equalizer and the main link transmitter;
A supplemental channel controller for controlling a link training operation to optimize transmission of the data signal over the main link; And
And a hot plug detector (HPD) controller for initializing the link training operation,
The link training operation may include:
A repeater apparatus as claimed in any one of claims 1 to 3, characterized in that it is implemented by a link training method according to any one of the preceding claims. 6. The adaptive equalizer of claim 5,
A signal quality determination unit for determining a quality of the data signal; And
And an equalizer for adjusting the quality of the data signal to improve the quality of the data signal under the control of the main controller. 6. The method of claim 5,
Wherein the main link transmitter adjusts a pre-emphasis and a voltage swing size of the data signal. 6. The method of claim 5,
The hot plug detector controller initiating the source device to resume link training. 6. The method of claim 5,
First and second auxiliary channel transceivers for transmitting and receiving link training related data to and from the source device and the sink device through the auxiliary channel;
A hot plug detector signal detector for detecting a hot plug detector signal to determine whether the sink device is connected; And
And a hot plug detector signal generator for generating and outputting a fake hot plug detector signal to the source device.

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