CN113965713A - HDMI active cable supporting high-speed signal link training - Google Patents

HDMI active cable supporting high-speed signal link training Download PDF

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CN113965713A
CN113965713A CN202111575233.0A CN202111575233A CN113965713A CN 113965713 A CN113965713 A CN 113965713A CN 202111575233 A CN202111575233 A CN 202111575233A CN 113965713 A CN113965713 A CN 113965713A
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signal
speed
speed signal
link training
frl
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CN113965713B (en
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李德振
江辉
周新亮
陈婷
程煜烽
徐亮
田进峰
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Everpro Technologies Wuhan Co Ltd
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Everpro Technologies Wuhan Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/015—High-definition television systems
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00—Pattern recognition
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    • G06F18/21—Design or setup of recognition systems or techniques; Extraction of features in feature space; Blind source separation
    • G06F18/214—Generating training patterns; Bootstrap methods, e.g. bagging or boosting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N17/00—Diagnosis, testing or measuring for television systems or their details

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Abstract

An HDMI active cable supporting high-speed signal link training is characterized in that an I2C signal monitoring module and a high-speed signal adjusting module are arranged at a first end and a second end, a low-speed sideband signal is monitored by the I2C signal monitoring module and is sent to the high-speed signal adjusting module, the high-speed signal adjusting module analyzes the received low-speed sideband signal, the requirement and the progress of the link training of a high-speed media signal are judged, a high-speed signal circuit is dynamically configured, the high-speed signal adjusting module can change the output configuration of the high-speed signal, and therefore the link training of the high-speed media signal is supported. The invention improves the compatibility of the active cable, monitors the link training failure event, automatically adjusts the active cable to work in the best state, and improves the stability of the active cable; the first end and the second end can communicate information to ensure that the two ends work in a synchronous and optimal combined state.

Description

HDMI active cable supporting high-speed signal link training
Technical Field
The invention relates to an HDMI active cable, in particular to an HDMI active cable supporting high-speed signal link training, which can solve the problem that the existing active cable cannot participate in link training.
Background
A High Definition Multimedia Interface (HDMI) is a digital Interface technology capable of transmitting video and audio simultaneously. The method is widely applied to consumer electronics products such as televisions, set top boxes and the like. In order to adapt to signal transmission with different qualities and find an optimized transmission link, the utilization rate of channel bandwidth is improved, the HDMI2.1 protocol adds the characteristic of carrying out link training on high-speed signals, parameters such as signal amplitude, pre-emphasis and the like sent by a sending end are negotiated between a Source end (Source) and a display end (Sink) according to self-supported performance and the signal quality of the transmission link, and the number of high-speed signal channels and the reduction of communication rate are negotiated.
At present, some active cables such as active optical cables have signal output amplitude and the like which do not change or linearly change along with the change of signal input amplitude of a transmitting end, optical signal receiving ends of the active cables can also fix a set of parameter settings and cannot be dynamically adjusted, and even some active cables supporting CDR (Clock and Data Recovery) cannot support dynamic adjustment of communication speed. When the Source end (Source) and the display end (Sink) perform link training, the Source end adjusts the amplitude of the signal output by the Source end according to the requirement of adjusting the amplitude of the signal sent by the display end, but the signal output by the active cable with the characteristics to the display end is not changed, so the link training between the Source end (Source) and the display end (Sink) is invalid in practice, which causes that the link training time is prolonged and even the link training fails because the transmission link cannot reach an optimal state.
For example, in some active cables with fixed parameters of a signal receiving end, when the signal quality of a transmission link between the transmitting end and the active cable is poor, if a relatively long copper wire extension line is connected, the active cables cannot adapt to the situation, and thus link training fails. In addition, when the communication rate needs to be decreased because the capability of the transmitting end or the receiving end does not support the highest rate, or the resolution and the refresh rate are adjusted based on the result of the link training, which may cause the failure of the link training at the communication rate that is not supported by the CDR, and the failure of normal communication.
Therefore, how to adapt to the variation of the high-speed signal link training is to provide an HDMI cable supporting the high-speed signal link training, which is a technical problem to be solved urgently in the prior art.
Disclosure of Invention
The invention aims to provide an HDMI active cable supporting high-speed signal link training, which monitors I in HDMI2.12C channel link training data, solve the unable problem of participating in the link training of current active cable.
In order to achieve the purpose, the invention adopts the following technical scheme:
an HDMI active cable supporting high speed signal link training,
the method comprises the following steps: a first terminal, a second terminal, and a high speed media signal line and a low speed control signal line between the first terminal and the second terminal,
the first end is used for connecting a source end, the second end is used for connecting a display end, the low-speed control signal line is used for transmitting a low-speed sideband signal, and the high-speed media signal line is used for transmitting a high-speed media signal;
wherein the second end has, or the first end and the second end have in each case:
I2c signal monitoring module and I in the low-speed control signal line2C signal line connection for monitoring link training data and transmitting the link training data or the link training data according to the linkThe judgment result identified by the road training data is sent to the high-speed signal adjusting module of the first end or the second end where the road training data is located;
the high-speed signal adjusting module is used for receiving the link training data or a judgment result identified according to the link training data, judging the state of link training and the high-speed signal parameter requirement according to the link training data or a judgment result identified according to the received link training data, and dynamically adjusting the working parameters in the high-speed signal circuit so as to support the link training of the high-speed media signal;
and the high-speed signal circuit is used for receiving, processing and converting the high-speed media signal, and working according to the parameters adjusted by the high-speed signal adjusting module to transmit the high-speed media signal.
Optionally, the high-speed signal adjusting module is connected to an HPD signal line in the low-speed control signal line, and when the HDMI active cable is powered on, the high-speed signal adjusting module turns on the high-speed signal circuit and configures the high-speed signal circuit as a default working state, and when the high-speed signal adjusting module detects that the HPD level is pulled high, the high-speed signal adjusting module turns on the I signal line2And C, a signal monitoring module.
Optionally, I2The C signal monitoring module is configured to monitor link training data, and send the link training data or a determination result identified according to the link training data to a high-speed signal adjustment module of a first end or a second end where the link training data is located, where the high-speed signal adjustment module dynamically adjusts a working parameter in a high-speed signal circuit according to a state of link training and a requirement of a high-speed signal parameter determined by the link training data or according to a received determination result identified by the link training data, so as to support link training of a high-speed media signal, and specifically includes:
when the source end and the display end start to perform high-speed data signal link training, I2The C signal monitoring module monitors link training data, and comprises a source end reading EDID data of a display end and sending the EDID data or a judgment result identified according to the EDID data to the high-speed signal adjusting module;
the high-speed signal adjusting module is used for adjusting the high-speed signal according to the EDID data:
judging whether the display end supports link training and whether link training is carried out;
reading the bandwidth and the channel number of the link training, controlling the high-speed signal circuit to adjust the CDR frequency band value, opening a corresponding high-speed signal channel, and closing an idle high-speed signal channel;
and reading the parameter values of the link training to adjust the working parameters of the high-speed signal circuit in real time, opening the high-speed signal channels with corresponding quantity, and closing the idle high-speed signal channels until all the signal channels are trained.
Optionally, the link training can be performed multiple times, said I2And the high-speed signal adjusting module continuously adjusts the parameters of the high-speed signal circuit in real time according to the requirement of link training so that the active cable works in the optimal state.
Optionally, the first end and the second end have I respectively2I of the first end during C signal monitoring module and high-speed signal adjusting module2C signal monitoring module and I of second terminal2The C signal monitoring module monitors link training data respectively and supports link training of high-speed media signals together with the high-speed signal adjusting module at the first end or the second end where the C signal monitoring module is located.
Optionally, I of the first terminal2The signal monitoring module C responds to the monitoring of the set FRL _ Rate value sent from the first end to the second end, extracts the FRL _ Rate value, and the high-speed signal adjusting module at the first end adjusts working parameters in the high-speed signal circuit according to the FRL _ Rate value; and/or
Second end of the tube2The signal monitoring module C responds to the set FRL _ Rate value sent from the first end to the second end, extracts the FRL _ Rate value, and the high-speed signal adjusting module at the second end adjusts working parameters in the high-speed signal circuit according to the FRL _ Rate value.
Optionally, I of the first terminal2The C signal monitoring module responds to the fact that the source end sends an EDID reading request to the display end, then the display end returns EDID data to the source end, and then the display end returns EDID data to the source endThe source end sends a reading FRL _ Ready request to the display end, then the display end returns FRL _ Ready to the source end, then the source end sends a setting FRL _ Rate value to the display end, and the high-speed signal adjusting module at the first end adjusts working parameters in the high-speed signal circuit according to the FRL _ Rate value; and/or
Second end of the tube2The C signal monitoring module responds to the fact that the source end sends an EDID reading request to the display end, then the display end returns EDID data to the source end, next the source end sends an FRL _ Ready reading request to the display end, next the display end returns FRL _ Ready to the source end, next the source end sends a set FRL _ Rate value to the display end, and the high-speed signal adjusting module of the second end adjusts working parameters in the high-speed signal circuit according to the FRL _ Rate value.
Optionally, I of the first terminal2The signal monitoring module responds to the fact that the display end sends an FRL updating request to the source end, the source end sends a set FRL _ Rate value to the display end, and the high-speed signal adjusting module of the first end adjusts working parameters in the high-speed signal circuit according to the FRL _ Rate value; and/or
Second end of the tube2The C signal monitoring module responds to the fact that the display end sends an FRL updating request to the source end, the source end sends a set FRL _ Rate value to the display end, and the high-speed signal adjusting module of the second end adjusts working parameters in the high-speed signal circuit according to the FRL _ Rate value.
Optionally, if the link training fails, the high-speed signal adjusting module pulls down the HPD, resets the high-speed signal circuit, and then releases the HPD, so as to prompt the source end and the display end to perform the link training again.
Optionally, I2I in C signal monitoring module and low-speed control signal line2C, signal line connection, specifically:
said I2The C signal monitoring module can directly control I in the signal line with low speed2C signal line, or directly with I in the first or second terminal2And C, pin connection.
The invention has the following advantages:
1. by monitoring the link training process of the sideband signals, dynamically adjusting the parameters of the signal output end of the sideband signals, triggering the signal input end adaptive process or adjusting the parameters of the signal input end and the parameters of the CDR module, the problems that the active cable cannot participate in link training and utilizes the link training to perform high-speed signal automatic adaptation are effectively solved, and the compatibility of the active cable is improved;
2. the active cable can execute corresponding link reset operation in a HPD pulling mode according to the working state of the high-speed link, comprises self parameters of resetting and reconfiguring the high-speed signal module, and monitors a link training failure event, so that the active cable is automatically adjusted to work in the optimal state, and the stability of the active cable is improved;
3. the first end and the second end can communicate information to ensure that the two ends work in a synchronous and optimal combined state.
Drawings
FIG. 1 is a schematic diagram of an HDMI active cable supporting high speed signal link training according to an embodiment of the present invention;
fig. 2 is a flow diagram of an HDMI active cable supporting high speed signal link training according to an embodiment of the present invention.
The reference numerals in the drawings respectively refer to the technical features:
1. a first end; 2. a second end; 3. a high-speed media signal line 4 and a low-speed control signal line; 5. a high-speed signal circuit; 6. i is2C, a signal monitoring module; 7. and a high-speed signal adjusting module.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The invention mainly comprises the following steps: setting I at the first and second ends of HDMI2C signal monitoring module and high-speed signal adjusting module, using I2C signal monitoring module in low-speed control signal lineFor monitoring low-speed sideband signals, e.g. I2And C, an HPD (Hot Plug detect) signal and the like, and transmits link training data or a judgment result identified according to the link training data to the high-speed signal adjustment module, judges the state of link training and the parameter requirement of the high-speed signal according to the link training data or dynamically adjusts working parameters in the high-speed signal circuit according to the received judgment result identified by the link training data, dynamically configures the high-speed signal circuit, such as pre-emphasis, output amplitude and the like, meets the requirements of source end and display end link training, and supports the link training of the high-speed media signal.
Therefore, the first end and the second end of the HDMI active cable can trigger the self-adaptive process of the signal of the first end and/or the second end according to the current link training process, such as the transmission of a certain link training sequence, and the signal quality of different links between the Source and the active cable is compatible.
Specifically, referring to fig. 1, a schematic diagram of an HDMI active cable supporting high speed signal link training is shown according to an embodiment of the present invention.
The method comprises the following steps: a first terminal 1, a second terminal 2, and a high-speed media signal line 3 and a low-speed control signal line 4 between the first terminal 1 and the second terminal 2,
the first end 1 is used for connecting a source end, the second end 2 is used for connecting a display end, the low-speed control signal line 4 is used for transmitting a low-speed sideband signal, and the high-speed media signal line 3 is used for transmitting a high-speed media signal;
wherein the second end has, or the first end and the second end have in each case:
I2c signal monitoring module 6, and I in low-speed control signal line 42The signal line C is connected and used for monitoring link training data and sending the link training data or a judgment result identified according to the link training data to the high-speed signal adjusting module of the first end or the second end where the link training data is located;
for example, I2The C signal monitoring module can directly control I in the signal line 42C signal line, or directly to the first terminal1 is2C pin is connected to realize I in low-speed sideband signal2And C channel connection.
Said I2The C signal monitoring module can monitor the link training data and directly send the link training data to the high-speed signal adjusting module 7.
Or, the said I2The C signal monitoring module can monitor link training Data, and send a determination result identified according to the link training Data, for example, an FRL _ Rate in a SCDCS (Status and Control Data Channel Structure), an FFE _ Levels value in the SCDCS, and the like, to the high-speed signal adjusting module at the first end or the second end where the C signal monitoring module is located.
The high-speed signal adjusting module 7 is configured to receive the link training data or a determination result identified according to the link training data, determine a state of link training and a high-speed signal parameter requirement according to the link training data or determine a determination result identified according to the received link training data, and dynamically adjust a working parameter in a high-speed signal circuit, thereby supporting link training of a high-speed media signal.
In the present invention, the high-speed signal adjusting module 7 may be an MCU (micro controller Unit).
And the high-speed signal circuit 5 is used for receiving, processing and converting high-speed media signals related to audio and video. Illustratively, the first end can receive an electrical signal emitted by the source end and convert the electrical signal into an optical signal to be output to the optical fiber, and the second end (close to the display end) can receive the optical signal output by the optical fiber and convert the optical signal into an electrical signal to be sent to the display end.
The high-speed signal circuit 5 can perform link training of the high-speed media signal according to the parameter modified by the high-speed signal adjusting module 7.
Specifically, referring to fig. 2, a flow chart of the HDMI active cable supporting high-speed signal link training is shown, the high-speed signal adjusting module 7 is connected to the HPD signal line in the low-speed control signal line 4, and after the HDMI active cable is powered on, the high-speed signal adjusting module 7 first turns on the high-speed signal lineThe circuit 5 is configured to be in a default working state, and when the high-speed signal adjusting module 7 detects that the HPD level is pulled high, the I is started2And C, a monitoring module.
I2The C signal monitoring module 6 monitors link training data and the high-speed signal adjusting module 7 determines the state of link training and the requirement of high-speed parameter according to the link training data, and modifies the working parameter in the high-speed signal circuit 5, so as to support the link training of high-speed media signals, which may specifically be:
when a Source terminal (Source) and a display terminal (Sink) start to perform high-speed data signal link training, FRL link training passes through I2The C signal line carries out SCDC (State and Control Data channel) Data transmission. At this time I2The C monitoring module 6 can monitor link training data, including that a Source (Source) reads EDID data of a display (Sink), and transmits the EDID data to the high-speed signal adjusting module 7 or transmits a judgment result identified according to the EDID data to the high-speed signal adjusting module, where the judgment result exemplarily includes an FRL _ Rate in the SCDCS, an FFE _ Levels value in the SCDCS, and the like;
the high-speed signal adjusting module 7, according to the EDID data:
judging whether a display terminal (Sink) supports link training and whether link training is carried out;
reading the bandwidth and the channel number of a Source end (Source) to be subjected to link training, controlling the high-speed signal circuit 5 to adjust the CDR frequency range value, opening the high-speed signal channels with corresponding number, and closing the idle high-speed signal channels;
and reading parameter values of Source end (Source) link training to control working parameters of the high-speed signal circuit 5, opening corresponding number of high-speed signal channels, and closing idle high-speed signal channels until all signal channels are trained. And link training of high-speed media signals is supported, and the signal specification transmitted by the source end is recovered at the tail end of the active cable.
And the high-speed signal adjusting module opens the corresponding high-speed signal channel and closes the idle high-speed signal channel.
In the present invention, see FIG. 2The first and second ends respectively have I2C signal monitoring module, high-speed signal adjusting module, I of first end2C signal monitoring module and I of second terminal2The C signal monitoring module monitors link training data respectively and supports link training of high-speed media signals together with the high-speed signal adjusting module at the first end or the second end where the C signal monitoring module is located, and the high-speed signal adjusting modules at the two ends can modulate working parameters of a high-speed signal circuit, so that link training of the high-speed signals is supported better.
That is, the respective monitoring modules at the two ends of the HDMI cable work independently; in the process of training the cooperation of the display end and the source end, the monitoring modules at the two ends of the cable do not know the working condition of the opposite end, but work according to the setting of the monitoring modules; or the monitoring module at one end works, and the monitoring module at the other end does not work or does not work completely.
The HDMI2.1 protocol standard analysis is adopted, and the high-speed signal adjustment module participates in the link training process specifically as follows:
1) first, I2The C monitoring module 6 monitors the Source end (Source) to read the Extended Display Identification Data of the Display end (Sink), and transmits the Data to the high-speed signal adjusting module 7. The high-speed signal adjusting module 7 analyzes the scds (Sink Capability Data structure) in the EDID Data according to the HDMI2.1 protocol specification, and determines the support characteristics of Sink for FRL link training: the field Max _ FRL _ Rate is larger than zero, the field SCDC _ Present value is 1, the field SCDC _ Sink _ Version is non-zero, and the simultaneous satisfaction of the field Max _ FRL _ Rate, the field SCDC _ Sink _ Version and the field SCDC _ Sink _ Version indicates that the display terminal (Sink) supports FRL link training in the HDMI2.1 protocol.
2) Then, I2The C monitoring module 6 monitors the write field FRL _ Rate of the Source reading display (Sink) and knows the bandwidth and channel number of the Source to perform link training according to the HDMI2.1 protocol. The high-speed signal adjusting module 7 adjusts the CDR frequency band value according to the FRL _ Rate value, and opens a corresponding number of high-speed signal channels or closes an idle high-speed signal channel. For example, during link training, the source end may specify the number of channels participating in link training: 3 or 4, and the 3 or 4 channelsLink training is performed simultaneously. The high-speed signal adjusting module 7 simultaneously opens 4 channels, or simultaneously opens 3 channels and closes 1 channel.
3) Continuing, I2The C monitoring module 6 monitors that the Source end (Source) writes a field FFE _ Levels to the display end (Sink), and can know a feed-forward equalizer (FFE) Level value representing a signal sent by the Source end (Source) according to the HDMI2.1 protocol. The high-speed signal adjusting module 7 adjusts the corresponding value of the ETX feedforward equalizer of the photoelectric conversion chip according to the FFE _ Levels value so as to recover the signal specification requirement transmitted by the source end at the tail end of the cable.
After the Source terminal (Source) and the display terminal (Sink) adjust the link training parameters through multiple communications, the link training is finished. During the period, the high-speed signal adjusting module continuously adjusts the parameters of the high-speed signal circuit in real time according to the requirement of link training, so that the active cable works in the optimal state.
After the link training is finished, the Source end (Source) and the display end (Sink) communicate the link training result through a sideband signal:
1) if the link training is successful, the high speed signal adjustment module 7 maintains the current high speed signal circuit configuration, I2The C signal monitoring module 6 is still in a working state, and continues to monitor the link training data to meet the new link requirement between the Source end (Source) and the display end (Sink).
2) If the link training fails, if the FRL _ Rate value is 0, the high-speed signal adjusting module pulls down the HPD, resets the high-speed signal circuit, and then releases the HPD to prompt the Source end (Source) and the display end (Sink) to perform the link training again. During a new round of link training, the high-speed signal adjustment module 7 tries new parameters to configure the high-speed signal circuit 5 and monitors the link training results.
The embodiments listed above are merely examples, as the link training is phased, I of the first end and the second end2The C signal monitoring module can respectively respond to the set FRL _ Rate value sent by the source end to the display end, so that the high-speed signal adjusting module of the local end adjusts the working parameters in the high-speed signal circuit of the local end according to the FRL _ Rate value。
I of the first and second ends2The C signal monitoring module can also more reliably identify the set FRL _ Rate value sent from the source end to the display end according to each stage in the link training.
I of the first and second ends2The C signal monitoring module can not only monitor that the source end sends a link training request to the display end, but also can reverse the link training request, namely I2And the C signal monitoring module monitors that the display end sends a link training request, such as an FRL (fast recovery loop) updating request, to the source end, and the high-speed signal adjusting module of the local end adjusts working parameters in the high-speed signal circuit of the local end according to the FRL _ Rate value.
Further, the high-speed signal adjusting modules 7 at the first end and the second end can perform real-time state communication, and synchronize working states of the two ends, for example, perform real-time state communication through a related communication method such as UART.
The invention has the following advantages:
1. by monitoring the link training process of the sideband signals, dynamically adjusting the parameters of the signal output end of the sideband signals, triggering the signal input end adaptive process or adjusting the parameters of the signal input end and the parameters of the CDR module, the problems that the active cable cannot participate in link training and utilizes the link training to perform high-speed signal automatic adaptation are effectively solved, and the compatibility of the active cable is improved;
2. the active cable can execute corresponding link reset operation in a HPD pulling mode according to the working state of the high-speed link, comprises self parameters of resetting and reconfiguring the high-speed signal module, and monitors a link training failure event, so that the active cable is automatically adjusted to work in the optimal state, and the stability of the active cable is improved;
3. the first end and the second end can communicate information to ensure that the two ends work in a synchronous and optimal combined state.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. An HDMI active cable supporting high speed signal link training,
the method comprises the following steps: a first terminal, a second terminal, and a high speed media signal line and a low speed control signal line between the first terminal and the second terminal,
the first end is used for connecting a source end, the second end is used for connecting a display end, the low-speed control signal line is used for transmitting a low-speed sideband signal, and the high-speed media signal line is used for transmitting a high-speed media signal;
wherein the second end has, or the first end and the second end have in each case:
I2c signal monitoring module and I in the low-speed control signal line2The signal line C is connected and used for monitoring link training data and sending the link training data or a judgment result identified according to the link training data to the high-speed signal adjusting module of the first end or the second end where the link training data is located;
the high-speed signal adjusting module is used for receiving the link training data or a judgment result identified according to the link training data, judging the state of link training and the high-speed signal parameter requirement according to the link training data or a judgment result identified according to the received link training data, and dynamically adjusting the working parameters in the high-speed signal circuit so as to support the link training of the high-speed media signal;
and the high-speed signal circuit is used for receiving, processing and converting the high-speed media signal, and working according to the parameters adjusted by the high-speed signal adjusting module to transmit the high-speed media signal.
2. The HDMI active cable of claim 1,
the high-speed signal adjusting module is connected with an HPD signal wire in the low-speed control signal wire and is used as an HDMI active wireAfter the cable is connected with a power supply, the high-speed signal adjusting module opens the high-speed signal circuit and configures the high-speed signal circuit as a default working state, and when the high-speed signal adjusting module detects that the HPD level is pulled high, the high-speed signal adjusting module opens the I2And C, a signal monitoring module.
3. The HDMI active cable of claim 2,
I2the C signal monitoring module is configured to monitor link training data, and send the link training data or a determination result identified according to the link training data to a high-speed signal adjustment module of a first end or a second end where the link training data is located, where the high-speed signal adjustment module dynamically adjusts a working parameter in a high-speed signal circuit according to a state of link training and a requirement of a high-speed signal parameter determined by the link training data or according to a received determination result identified by the link training data, so as to support link training of a high-speed media signal, and specifically includes:
when the source end and the display end start to perform high-speed data signal link training, I2The C signal monitoring module monitors link training data, and comprises a source end reading EDID data of a display end and sending the EDID data or a judgment result identified according to the EDID data to the high-speed signal adjusting module;
the high-speed signal adjusting module is used for adjusting the high-speed signal according to the EDID data:
judging whether the display end supports link training and whether link training is carried out;
reading the bandwidth and the channel number of the link training, controlling the high-speed signal circuit to adjust the CDR frequency band value, opening a corresponding high-speed signal channel, and closing an idle high-speed signal channel;
and reading the parameter values of the link training to adjust the working parameters of the high-speed signal circuit in real time, opening the high-speed signal channels with corresponding quantity, and closing the idle high-speed signal channels until all the signal channels are trained.
4. The HDMI active cable of claim 3,
link training can be performed multiple times, I2And the high-speed signal adjusting module continuously adjusts the parameters of the high-speed signal circuit in real time according to the requirement of link training so that the active cable works in the optimal state.
5. HDMI active cable according to any of claims 2-4,
the first and second ends respectively have I2I of the first end during C signal monitoring module and high-speed signal adjusting module2C signal monitoring module and I of second terminal2The C signal monitoring module monitors link training data respectively and supports link training of high-speed media signals together with the high-speed signal adjusting module at the first end or the second end where the C signal monitoring module is located.
6. The HDMI active cable of claim 1,
i of the first end2The signal monitoring module C responds to the monitoring of the set FRL _ Rate value sent from the first end to the second end, extracts the FRL _ Rate value, and the high-speed signal adjusting module at the first end adjusts working parameters in the high-speed signal circuit according to the FRL _ Rate value; and/or
Second end of the tube2The signal monitoring module C responds to the set FRL _ Rate value sent from the first end to the second end, extracts the FRL _ Rate value, and the high-speed signal adjusting module at the second end adjusts working parameters in the high-speed signal circuit according to the FRL _ Rate value.
7. The HDMI active cable of claim 6,
i of the first end2The C signal monitoring module responds to the fact that the source end sends an EDID reading request to the display end, then the display end returns EDID data to the source end, next the source end sends an FRL _ Ready reading request to the display end, next the display end returns FRL _ Ready to the source end, and next the source end sends a set FRL _ Rate value to the display end, and the source end of the first end sends a set FRL _ Rate value to the display endThe high-speed signal adjusting module adjusts working parameters in a high-speed signal circuit according to the FRL _ Rate value; and/or
Second end of the tube2The C signal monitoring module responds to the fact that the source end sends an EDID reading request to the display end, then the display end returns EDID data to the source end, next the source end sends an FRL _ Ready reading request to the display end, next the display end returns FRL _ Ready to the source end, next the source end sends a set FRL _ Rate value to the display end, and the high-speed signal adjusting module of the second end adjusts working parameters in the high-speed signal circuit according to the FRL _ Rate value.
8. The HDMI active cable of claim 6 or 7,
i of the first end2The signal monitoring module responds to the fact that the display end sends an FRL updating request to the source end, the source end sends a set FRL _ Rate value to the display end, and the high-speed signal adjusting module of the first end adjusts working parameters in the high-speed signal circuit according to the FRL _ Rate value; and/or
Second end of the tube2The C signal monitoring module responds to the fact that the display end sends an FRL updating request to the source end, the source end sends a set FRL _ Rate value to the display end, and the high-speed signal adjusting module of the second end adjusts working parameters in the high-speed signal circuit according to the FRL _ Rate value.
9. The HDMI active cable of claim 6,
if the link training fails, the high-speed signal adjusting module pulls down the HPD, resets the high-speed signal circuit, and then releases the HPD to prompt the source end and the display end to carry out link training again.
10. The HDMI active cable of claim 6,
I2i in C signal monitoring module and low-speed control signal line2C, signal line connection, specifically:
said I2C signalThe monitoring module can directly control I in the signal line with low speed2C signal line, or directly with I in the first or second terminal2And C, pin connection.
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