CN113852448A - Device compatible with multiple transmission rates of active cable and method thereof - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
- H04N21/43632—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wired protocol, e.g. IEEE 1394
- H04N21/43635—HDMI
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Abstract
The present disclosure relates to an apparatus compatible with multiple transmission rates of an active cable and a method thereof. The active cable includes front-end circuitry and output circuitry, and the apparatus includes: a rate detection unit connected with an output of the front-end circuit and configured to: detecting the current speed of the output signal of the front-end circuit; comparing the current rate with a rate threshold value to obtain a comparison result; a signal configuration unit connected to the rate detection unit and the output circuit, respectively, and configured to: receiving the comparison result from the rate detection unit; and determining, based on the comparison, to configure the output circuit with one of a plurality of parameter configurations to cause the output circuit to perform data transmission with an operating state adapted to the current rate. By using the scheme disclosed by the invention, the compatibility of the active cable can be improved.
Description
Technical Field
The present disclosure relates generally to the field of active cable technology. More particularly, the present disclosure relates to an apparatus, method, and active cable apparatus and computer-readable storage medium for compatibility with multiple transmission rates of an active cable.
Background
An active cable typically includes connectors at both ends and a copper wire or optical cable connecting the two connectors to enable transmission of data signals (e.g., video data and audio data) for display of the data signals. At present, in order to support high-resolution display of 4K or even 8K, the communication bandwidth is increased by the existing video and audio transmission protocol. For example, the display interface ("DP") 1.4 protocol specifies that a single channel can support up to 8.1Gbps bandwidth. A Fixed Rate Link ("FRL") transmission mode is also added to the latest High Definition Multimedia Interface ("HDMI") 2.1 protocol to increase the highest bandwidth of a single channel to 12 Gbps. However, for the active cable supporting the high-speed audio/video transmission, the parameters of the high-speed signal circuit are usually configured at a fixed gear. This is less compatible and consumes more power for displays with less than 1080P resolution. For example, the communication rate may be as low as 1.62Gbps DisplayPort single channel or even 25MHz HDMI single channel (clock channel).
In order to accommodate multiple transmission rates, it is known to add a listening circuit for low-speed sideband signals (e.g., AUX channel in DisplayPort or I2C channel in HDMI) over the active cable. And correspondingly setting high-speed channel parameters by analyzing the communication rate negotiation between the Source and the Sink, thereby adapting to the application of various resolutions. However, by adding special hardware or software to the active cable to perform the monitoring and analysis of the low-speed sideband signals, not only the area and power consumption of the signal processing circuit of the active cable are increased, but also the difficulty of product design and manufacturing process and the production cost may be increased. In the process, errors occur, and the low-speed sideband signals can cause the original electrical characteristics of the system to change, so that the signal transmission and the system compatibility are influenced.
Furthermore, since the high-speed signal processing chip itself has a bandwidth limitation, and thus in the case of limitations in power consumption and area, compatibility between a high bandwidth (12 Gbps) and a low bandwidth (100 MHz or less) is desired, a relatively complicated circuit needs to be designed on the chip, and even if the chip bandwidth is designed to be compatible between a high bandwidth and a low bandwidth, a specific setting needs to be made for the chip according to different application scenarios. That is, it is necessary to know whether the current application is low resolution or high resolution, and then make software or hardware modifications to the active cable, making the procedure complicated.
Disclosure of Invention
To at least partially solve the technical problems mentioned in the background, the solution of the present disclosure provides a solution for compatible multiple transmission rates of active cables. By the scheme, the compatibility of the active cable in high-resolution or low-resolution application scenes can be improved. To this end, the present disclosure provides solutions in a number of aspects as follows.
In one aspect, the present disclosure provides an apparatus for compatible multiple transmission rates of an active cable, wherein the active cable includes front-end circuitry and output circuitry, and the apparatus comprises: a rate detection unit connected with an output of the front-end circuit and configured to: detecting the current speed of the output signal of the front-end circuit; comparing the current rate with a rate threshold value to obtain a comparison result; a signal configuration unit connected to the rate detection unit and the output circuit, respectively, and configured to: receiving the comparison result from the rate detection unit; and determining, based on the comparison, to configure the output circuit with one of a plurality of parameter configurations to cause the output circuit to perform data transmission with an operating state adapted to the current rate.
In one embodiment, wherein the plurality of parameter configurations includes a first parameter configuration and a second parameter configuration, wherein the first parameter configuration corresponds to a first output rate and the second parameter configuration corresponds to a second output rate, and in determining to configure the output circuit with one of the plurality of parameter configurations, the signal configuration unit is to: and determining to configure the output circuit with the first parameter configuration or the second parameter configuration according to the comparison result so as to enable the output circuit to carry out data transmission in an operating state which is adaptive to the first output rate or the second output rate.
In another embodiment, wherein it is determined from the comparison that the output circuit configuration is paired in the first parameter configuration or the second parameter configuration, the signal configuration unit is configured to: configuring the output circuit with the first parameter configuration in response to the current rate being above a rate threshold value; or configuring the output circuit with the second parameter configuration in response to the current rate being below a rate threshold value.
In yet another embodiment, wherein the first parameter configuration involves the enabling of pre-emphasis, equalizer and/or clock data recovery circuitry, and the second parameter configuration involves the disabling of pre-emphasis, equalizer and/or clock data recovery circuitry.
In a further embodiment, wherein the signal configuration unit comprises a micro control unit for reading the comparison result from the rate detection unit and configuring the output circuit accordingly in dependence on the comparison result.
In yet another embodiment, wherein the active cable comprises at least a display interface active cable, the display interface active cable comprises four high-speed signal transmission channels, and each of the high-speed signal transmission channels comprises the front-end circuitry and the output circuitry, and: the speed detection unit is connected with the output end of the front-end circuit of the first high-speed signal transmission channel and is used for: detecting the current speed of the output signal of the front-end circuit of the first high-speed signal transmission channel connected with the front-end circuit; comparing the current rate with a rate threshold value to obtain a comparison result; the signal configuration unit is connected with the rate detection unit and the output circuit of each high-speed signal transmission channel and is used for: receiving the comparison result from the rate detection unit; and determining, according to the comparison result, to configure the output circuit of each of the transmission channels with one of a plurality of parameter configurations, so as to cause the output circuit to perform data transmission in an operating state adapted to the current rate.
In yet another embodiment, wherein the active cable further comprises a high definition multimedia interface active cable, the high definition multimedia interface active cable comprises four high speed signal transmission channels, and the four high speed signal transmission channels each comprise the front end circuitry, the output circuitry, and: the speed detection unit is connected with the output end of the front-end circuit of any one of the high-speed signal transmission channels and is used for: detecting the current speed of the output signal of the front-end circuit of any one of the high-speed signal transmission channels connected with the front-end circuit; comparing the current rate with a rate threshold value to obtain a comparison result; the signal configuration unit is connected with the rate detection unit and the output circuit of each high-speed signal transmission channel and is used for: receiving the comparison result from the rate detection unit; and determining to configure the output circuits of the four high-speed signal transmission channels with one of a plurality of parameter configurations according to the comparison result so as to enable the output circuits to carry out data transmission in an operating state which is adaptive to the current speed.
In another aspect, the present disclosure also provides an active cable device comprising: an active cable; and an apparatus according to the preceding embodiments and configured to accommodate multiple transmission rates of the active cable.
In yet another aspect, the present disclosure also provides a method for accommodating multiple transmission rates of an active cable, the active cable including front-end circuitry and output circuitry, and the method comprising: detecting the current speed of the output signal of the front-end circuit; comparing the current rate with a rate threshold value to obtain a comparison result; and determining, based on the comparison, to configure the output circuit with one of a plurality of parameter configurations to cause the output circuit to perform data transmission with an operating state adapted to the current rate.
In yet another aspect, the present disclosure also provides a computer readable storage medium having stored thereon computer readable instructions of program instructions for compatible multiple transmission rates of an active cable, which when executed by one or more processors, implement various embodiments as previously described.
According to the scheme, the rate detection unit is added to detect the current rate of the signal and compare the current rate with the rate threshold value, and then the signal configuration unit is used for carrying out corresponding parameter configuration according to the comparison result, so that the active cable can be compatible with different rates, and is suitable for high-resolution and low-resolution application scenes. Furthermore, the embodiment of the disclosure realizes the detection of the rate and the parameter configuration through the rate detection unit and the signal configuration unit, and reduces the monitoring and analysis of the low-speed sideband signal, thereby greatly reducing the complexity of the manufacturing process and the production cost.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. In the drawings, several embodiments of the disclosure are illustrated by way of example and not by way of limitation, and like or corresponding reference numerals indicate like or corresponding parts and in which:
FIG. 1 is an exemplary schematic diagram illustrating an active cable;
fig. 2 is an exemplary block diagram illustrating an apparatus for accommodating multiple transmission rates of an active cable according to an embodiment of the present disclosure;
fig. 3 is an exemplary schematic diagram illustrating an apparatus for compatible multiple transmission rates of an active cable according to an embodiment of the present disclosure;
fig. 4 is an exemplary schematic diagram illustrating a cable for a DP compatible active cable according to an embodiment of the present disclosure;
fig. 5 is an exemplary schematic diagram illustrating an active cable for HDMI compatibility according to an embodiment of the present disclosure;
fig. 6 is an exemplary block diagram illustrating an active cable device according to an embodiment of the present disclosure; and
fig. 7 illustrates an example flow diagram of a method for compatible multiple transmission rates of an active cable in accordance with an embodiment of this disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the embodiments described in this specification are only some of the embodiments of the present disclosure provided to facilitate a clear understanding of the aspects and to comply with legal requirements, and not all embodiments of the present disclosure may be implemented. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed in the specification without making any creative effort, shall fall within the protection scope of the present disclosure.
Fig. 1 is an exemplary schematic diagram illustrating an active cable 100. As shown in fig. 1, the active cable 100 may include two connectors 101 with electronics 102 disposed within each connector 101. Further, the two connectors 101 are connected by a copper wire or an optical cable to realize data signal (e.g., audio signal, video signal) transmission. In one implementation scenario, within the aforementioned connector 101, through different types of electronic devices 102, for example, a front-end circuit, a high-speed transmission circuit, and an output circuit may be configured, so that a data signal is sequentially output through the aforementioned front-end circuit, high-speed transmission circuit, and output circuit. Wherein the data signal may be simply pre-processed (e.g., filtered) by the aforementioned front-end circuitry for receipt by the high-speed transmission circuitry. Then, the data signal after the preprocessing can be subjected to processes such as amplification and signal amplitude adjustment by the high-speed transmission circuit, and the processed data signal can be output via an output circuit.
Fig. 2 is an exemplary block diagram illustrating an apparatus 200 for compatible multiple transmission rates of an active cable according to an embodiment of the disclosure. As shown in fig. 2, the apparatus 200 may include a rate detection unit 201 and a signal configuration unit 202. The aforementioned rate detection unit 201 and signal configuration unit 202 will be described in detail below.
From the foregoing, it can be seen that an active cable may include front-end circuitry and output circuitry. In one embodiment, the rate detection unit 201 may be connected to an output of a front-end circuit of the active cable, and configured to detect a current rate of an output signal of the front-end circuit, and then compare the current rate with a rate threshold value to obtain a comparison result. In some embodiments, the rate detection unit may detect the current rate of the output signal of the front-end circuit by, for example, a sampling circuit. It will be appreciated that the speed of the signal rate is typically manifested as a speed of high and low level changes. Therefore, the current speed of the output signal of the front-end circuit can be obtained by detecting the change times of high and low levels in the sampling period by using the sampling circuit.
After obtaining the current rate of the output signal of the front-end circuit, the rate detection unit may compare the current rate with a rate threshold value to obtain a comparison result. That is, whether the current rate is a high rate or a low rate is determined by comparing the current rate with a rate threshold value, so as to configure the output circuit based on different rates. In one implementation scenario, the aforementioned rate threshold value may be determined from the single channel communication rate of the active cable. For example, in the case of a DP active cable, it may typically include four high-speed signal transmission channels, and the single-channel communication rate of each high-speed signal transmission channel is, for example, 1.62Gbps, 2.7 Gbps, 5.4 Gbps, and 8.1 Gbps. In this scenario, the rate threshold may be set to 7Gbps, and when the current rate is higher than 7Gbps, the output signal of the front-end circuit is a high-rate output signal. In contrast, when the current rate is lower than 7Gbps, the output signal of the front-end circuit is a low-rate output signal. In one exemplary scenario, the comparison of the current rate to the rate threshold value is typically either a "1" or a "0". For example, when the current rate is higher than the rate threshold, the comparison result is "1". When the current rate is lower than the rate threshold value, the comparison result is '0'. In other words, the output signal of the front-end circuit is "1" when the output signal is a high-rate output signal, and is "0" when the output signal of the front-end circuit is a low-rate output signal.
In one embodiment, the signal configuration unit 202 may be connected to the rate detection unit 201 and an output circuit of the active cable, respectively, and configured to receive a comparison result from the rate detection unit 201. Then, the output circuit is configured according to one of the parameter configurations determined according to the comparison result, so that the output circuit is enabled to carry out data transmission in an operating state which is adaptive to the current speed. That is, the signal configuration unit may configure the output circuit with one of the plurality of parameter configurations according to whether the comparison result is "1" or "0". In some embodiments, the signal configuration Unit may include a micro controller Unit ("MCU") that may be used to read the comparison result ("1" or "0") from the rate detection Unit to configure the output circuit accordingly.
In one embodiment, the plurality of parameter configurations may include a first parameter configuration and a second parameter configuration, wherein the first parameter configuration corresponds to a first output rate (e.g., a high rate) and the second parameter configuration corresponds to a second output rate (e.g., a low rate). In configuring the output circuit with one of the plurality of parameter configurations, the signal configuration unit may determine, according to the comparison result, to configure the output circuit with the first parameter configuration or the second parameter configuration, so as to cause the output circuit to perform data transmission in an operating state adapted to the first output rate or the second output rate. Specifically, in response to the current rate being higher than the rate threshold value (i.e., the comparison result being "1"), the signal configuration unit configures the output circuit with the first parameter configuration, and in response to the current rate being lower than the rate threshold value (i.e., the comparison result being "0"), the signal configuration unit configures the output circuit with the second parameter configuration.
In one implementation scenario, the first parameter configuration may relate to, for example, enabling of pre-emphasis, equalizer, and/or clock data recovery circuitry, and the second parameter configuration may relate to not enabling, for example, pre-emphasis, equalizer, and/or clock data recovery circuitry. It will be appreciated that pre-emphasis is a way of signal processing that compensates for high frequency components of the input signal at the transmitting end. In an application scenario, as the signal rate increases, the signal is severely damaged in the transmission process, and in order to obtain a better signal waveform at the receiving terminal, the damaged signal needs to be compensated, so that pre-emphasis can be adopted to avoid the signal damage. The aforementioned equalizer can be used to correct the transmission channel amplitude frequency characteristic and phase frequency characteristic to modify the waveform of the output signal. The clock data recovery circuit mainly extracts a data sequence from a received signal and recovers a clock timing signal corresponding to the data sequence, thereby recovering the received specific information. In the disclosed embodiment, the pre-emphasis, equalizer and/or clock data recovery circuit are in a fixed configuration, and the signal configuration unit may configure the output circuit by controlling, for example, whether the register triggers the pre-emphasis, equalizer and/or clock data recovery circuit. For example, when the signal configuration unit receives that the comparison result is '1', the control register triggers the pre-emphasis, equalizer and/or clock data recovery circuit to perform the first parameter configuration. When the signal configuration unit receives that the comparison result is '0', the control register does not trigger the pre-emphasis circuit, the equalizer and/or the clock data recovery circuit to perform second parameter configuration.
As can be seen from the above description, the embodiments of the present disclosure determine the high and low rate signals by comparing the current rate of the output signal of the front-end circuit with the rate threshold value, so as to configure the output circuit with the first parameter configuration or the second parameter configuration for the high rate signal and the low rate signal, respectively, so that the active cable can be compatible with different transmission rates. Furthermore, the rate detection unit and the signal configuration unit are only added in the embodiment of the disclosure, so that monitoring and analysis of low-rate signals are reduced, the device of the embodiment of the disclosure is simplified, and complexity and production cost of a manufacturing process are reduced.
Fig. 3 is an exemplary schematic diagram illustrating an apparatus for compatible multiple transmission rates of an active cable according to an embodiment of the present disclosure. It is to be understood that fig. 3 is an embodiment of the apparatus 200 of fig. 2, as described above, and therefore the description made above with respect to fig. 2 applies equally to fig. 3.
As shown in fig. 3, the active cable may include a front-end circuit 301 and an output circuit 302. In one exemplary scenario, the active cable may also include high speed transmission circuitry 303. Further, a rate detection unit 201 is connected to an output end of the front-end circuit 301, and the rate detection unit 201 is also connected to the signal configuration unit 202. Further, the signal configuration unit 202 is also connected to the output circuit 302. As mentioned above, the aforementioned front-end circuit may be used to pre-process an input signal and output it via its output terminal, which is transmitted to the output circuit via the high-speed transmission circuit. Then, the current rate of the output signal of the front-end circuit is detected by the rate detection unit, and the current rate is compared with the rate threshold value to obtain the comparison result ("1" or "0"). When the comparison result is 1, the signal configuration unit controls, for example, a register to trigger, for example, pre-emphasis, an equalizer, and/or a clock data recovery circuit so as to configure the output circuit with the first parameter configuration. In contrast, when the comparison result is 0, the signal configuration unit controls, for example, the register not to trigger the pre-emphasis, the equalizer, and/or the clock data recovery circuit so as to configure the output circuit with the second parameter configuration. Based on the data transmission method, the output circuit is enabled to carry out data transmission in the working state of adapting to the current speed, and therefore compatibility of the active cable with different transmission speeds can be achieved.
In some embodiments, the first parameter configuration may relate to, for example, the enabling of an amplifier in addition to the pre-emphasis, the enabling of an equalizer and/or a clock data recovery circuit. Based on the above description, the high-speed transmission circuit can amplify, adjust the amplitude, and the like the output signal. For example, in an implementation scenario, when the comparison result is "1", the signal configuration unit may control the register to trigger the amplifier to select the amplification factor, or control the register to trigger the equalizer to select the amplitude value to be adjusted, so as to adjust the waveform of the output signal, or may also control the register to trigger the pre-emphasis to compensate the output signal, so as to configure the output circuit with the first parameter configuration.
According to the foregoing description, the signal configuration unit may comprise an MCU to read the comparison result from the rate detection unit and configure the output circuit accordingly according to the comparison result. In some embodiments, the MCU may be separately external to or internal to the integrated circuit and connected to the rate detection unit and the signal configuration unit, respectively. In this scenario, the MCU is configured to read the comparison result from the rate detection unit and transmit the comparison result to the signal configuration unit, which controls the register according to the comparison result, thereby configuring the output circuit accordingly. In one embodiment, when built in an integrated circuit, the MCU may be replaced by, for example, a logic circuit, that is, the comparison result is judged to be "1" or "0" by the logic circuit, and the register is controlled by the signal configuration unit according to the comparison result, so as to configure the output circuit accordingly.
In one embodiment, the active cable may include, but is not limited to, a DP active cable and a High Definition Multimedia Interface ("HDMI") active cable. The foregoing DP active cable and HDMI active cable will be described in detail below, respectively.
For a DP active cable, it may typically include four high-speed signal transmission channels, and each high-speed signal transmission channel may include the aforementioned front-end circuitry, high-speed transmission circuitry, and output circuitry. As previously described, the single channel rate of each high speed signal transmission channel in the DP active cable may be, for example, 1.62Gbps, 2.7 Gbps, 5.4 Gbps, and 8.1Gbps, with a rate threshold set at 7 Gbps. It will be appreciated that the DP active cable may operate in single channel mode (i.e., 1-Lane), dual channel mode (i.e., 2-Lanes), or quad channel mode (i.e., 4-Lanes), i.e., only the first channel, the first and second two channels, or all four channels for data transmission. Therefore, the rate detection unit of the embodiment of the present disclosure should be connected to the output end of the front-end circuit of the first high-speed signal transmission channel of the DP active cable to ensure that the current rate of the output signal can be detected in the single channel mode. Further, the output circuit of each high-speed signal transmission channel is configured according to the detected current rate via the signal configuration unit of the embodiment of the present disclosure. The DP active cable will be described in detail later in conjunction with fig. 4.
For an HDMI active cable, it may also include four high-speed signal transmission channels. However, the high-speed signal transmission channels of the HDMI active cable are different in different transmission modes, and the signal rate of each high-speed signal transmission channel is also different in different modes. In Transition Minimized Differential Signaling ("TMDS") mode, the four high-speed signal transmission channels of an HDMI active cable may include one Clock channel (TMDS Clock) and three Data channels (TMDS Data 0-Data 2). The single channel rate of the clock channel can be 25-340 MHz, and the single channel rate of each data channel can be 10 times or 40 times of the clock channel and does not exceed 6 Gbps. In Fixed Rate Link ("FRL") mode, the four high-speed signal transmission channels of the HDMI active cable are FRL Lane 0-Lane 3. In one implementation scenario, the FRL mode may employ three channels (3-Lanes), i.e., the fourth channel (FRL Lane 3) with no signal transmission (rate 0). In this scenario, the single channel rate of the other three channels of the HDMI active cable (FRL Lane 0-Lane 2) may be 3Gbps or 6 Gbps. In another implementation scenario, FRL mode may also employ four channels (4-Lanes), each of which may have a single channel rate of 6Gbps, 8 Gbps, 10 Gbps, or 12 Gbps. Table 1 exemplarily shows a single-channel speed table of each high-speed signal transmission channel of the HDMI active cable in different modes.
TABLE 1 channel speed table
Generally, the rate threshold value of the above-described HDMI active cable may be set to 7 Gbps. In some embodiments, the rate detection unit of the embodiment of the disclosure may be connected to an output end of a front-end circuit of any one high-speed signal transmission channel of the HDMI active cable, and further configure an output circuit of each high-speed signal transmission channel according to the detected current rate via the signal configuration unit of the embodiment of the disclosure. The HDMI active cable will be described in detail later in conjunction with fig. 5.
Fig. 4 is an exemplary schematic diagram illustrating a cable for a DP compatible active cable according to an embodiment of the present disclosure. Four high-speed signal transmission channels of the DP active cable are shown by way of example in fig. 4, including high-speed signal transmission channels DP Lane0-DP Lane 3. Each high-speed signal transmission channel includes a front-end circuit 301, a high-speed transmission circuit 303, and an output circuit 302. Further, a rate detection unit 201 is connected to an output terminal of the front end circuit of the first high-speed signal transmission path DP Lane0, and the rate detection unit 201 is connected to the signal configuration unit 202. As further shown, the signal configuration unit 202 is also connected to the output circuits of the high speed signal transmission channels DP Lane0-DP Lane 3. As previously mentioned, the rate threshold of the DP active cable may be set to 7 Gbps. When the rate detection unit 201 detects that the current rate of the output signal of the front-end circuit of the high-speed signal transmission channel DP Lane0 is higher than 7Gbps (i.e., "1" as a comparison result), the signal configuration unit 202 configures the output circuits of the high-speed signal transmission channels DP Lane0-DP Lane3 with a first parameter configuration (i.e., enables pre-emphasis, equalizer, or CDR circuit) so as to make the output circuits of the high-speed signal transmission channels with signal inputs perform data transmission in an operating state adapted to the current rate. On the contrary, when the rate detection unit 201 detects that the current rate of the output signal of the front-end circuit of the high-speed signal transmission channel DP Lane0 is lower than 7Gbps (i.e., "0" as a comparison result), the signal configuration unit 202 configures the output circuits of the high-speed signal transmission channels DP Lane0-DP Lane3 with a second parameter configuration (i.e., without enabling pre-emphasis, equalizer, or CDR circuit) so as to make the output circuits of the high-speed signal transmission channels having signal inputs perform data transmission in an operating state adapted to the current rate.
Fig. 5 is an exemplary diagram illustrating an active cable for compatible HDMI according to an embodiment of the present disclosure. As exemplarily shown in FIG. 5, the four high-speed signal transmission channels of the HDMI active cable, which may be a Clock channel TMDS Clock and a Data channel TMDS Data0-TMDS Data2 in TMDS mode. In one exemplary scenario, the four high speed signal transmission channels may also be the high speed signal transmission channels FRL Lane 0-FRL Lane3 in FRL mode. Similarly to the above-described HDMI active cable, each high-speed signal transmission channel includes a front-end circuit 301, a high-speed transmission circuit 303, and an output circuit 302. As described above, the HDMI active cable may be connected to the rate detection unit at the output terminal of the front-end circuit of any one of the high-speed signal transmission channels. The figure exemplarily shows that a rate detection unit 201 is connected to the output end of the front-end circuit of the first high-speed signal transmission channel FRL Lane 0/TMDS Data0, and the rate detection unit 201 is connected to the signal configuration unit 202. As further shown, the signal configuration unit 202 is also connected to the output circuits of the Clock channel TMDS Clock and Data channels TMDS Data0-TMDS Data2 or the high speed signal transmission channels FRL Lane 0-FRL Lane 3.
In one embodiment, the rate threshold for HDMI active cables may also be set to 7 Gbps. When the rate detection unit 201 detects that the current rate of the output signal of the front-end circuit of the FRL Lane 0/TMDS Data0 is lower than 7Gbps (i.e., "0" as a result of the comparison), the signal configuration unit 202 configures the output circuits of the Clock channel TMDS Clock and Data channels TMDS Data0-TMDS Data2 or the high-speed signal transmission channels FRL Lane 0-FRL Lane3 with the second parameter configuration (i.e., no pre-emphasis, equalizer, or CDR circuit is enabled). When the rate detecting unit 201 detects that the current rate of the output signal of the front-end circuit of FRL Lane 0/TMDS Data0 is higher than 7Gbps (i.e., "0" as a result of the comparison), the signal configuring unit 202 configures the output circuits of the Clock channel TMDS Clock and the Data channels TMDS 0-TMDS Data2 or the high-speed signal transmission channels FRL Lane 0-FRL Lane3 with a first parameter configuration (i.e., enables pre-emphasis, equalizer, or CDR circuit) so as to make the output circuits of the high-speed signal transmission channels having signal inputs perform Data transmission in an operating state adapted to the current rate.
In some embodiments, when the rate detection unit is connected to the output of the front-end circuit of TMDS Clock/FRL Lane3, the transmission rate of FRL Lane3 may be 0 (i.e., Lane3 has no signal transmission in 3 Lanes mode of FRL). In this scenario, the signal configuration unit may configure the output circuits of the Clock channels TMDS Clock and Data channels TMDS Data0-TMDS Data2 or the high speed signal transmission channels FRL Lane 0-FRL Lane3 with a second parametric configuration (i.e., no pre-emphasis, equalizer, or CDR circuits enabled).
In some embodiments, a rate detection unit may be further added to the front-end circuit output end of each high-speed signal transmission channel of the active cable, and the output circuit of each high-speed signal transmission channel may be connected to a signal configuration unit, which is correspondingly connected to the rate detection unit. That is, the output circuits of the respective high-speed signal transmission channels are individually configured by detecting the current rates of the output signals of the front-end circuits of the respective high-speed signal transmission channels. In addition, the embodiment of the present disclosure may further add a rate detection unit at the output end of the front end circuit of each high-speed signal transmission channel of the active cable, connect all the rate detection units with one signal configuration unit, and connect the signal configuration unit with the output circuit of each high-speed signal transmission channel. Under the scene, the output circuit of the high-speed signal transmission channel can be correspondingly configured according to the speed detection results of all the high-speed signal transmission channels, so that the speed detection error is avoided, and the accuracy of the detection result is improved.
In one embodiment, the disclosed embodiments also provide an active cable device, such as that shown in fig. 6.
Fig. 6 is a block diagram illustrating an exemplary configuration of an active cable device 600 according to an embodiment of the present disclosure. As shown in fig. 6, the active cable device 600 may include an active cable 601 (i.e., the active cable 100 shown in fig. 1) and the device 200 for compatible multiple transmission rates of the active cable of the embodiments of the present disclosure. The apparatus 200 may include a rate detection unit 201 and a signal configuration unit 202. In one embodiment, the active cable 601 may include, but is not limited to, the DP active cable and the HDMI active cable described above. The aforementioned DP active cable and HDMI active cable may each include four high-speed signal transmission channels, and each high-speed signal transmission channel may include a front-end circuit, a high-speed transmission circuit, and an output circuit. In one implementation scenario, the rate detection unit 201 may be connected to an output of the front-end circuit of the active cable 601 to detect a current rate of the output signal of the front-end circuit, and compare the current rate with a rate threshold value to obtain a comparison result. Further, the signal configuration unit 202 may be connected to the rate detection unit 201 and the output circuit, respectively, and determine to configure the output circuit with the first parameter configuration or the second parameter configuration according to the comparison result, so as to enable the output circuit to perform data transmission in an operation state adapted to the current rate. The present disclosure will not be described in detail herein with reference to the descriptions of fig. 2-5.
Fig. 7 illustrates an example flow diagram of a method 700 for compatible multiple transmission rates of an active cable in accordance with an embodiment of this disclosure. As shown in fig. 7, at step S702, the current rate of the front-end circuit output signal is detected. In one embodiment, the rate detection unit may be added at the output of the front-end circuitry of the active cable. The rate detection unit may comprise, for example, a sampling circuit, which detects the current rate of the output signal of the front-end circuit by collecting high-low level changes of the output signal. Based on the acquired current rate, at step S704, the current rate is compared with a rate threshold value to obtain a comparison result. Further, at step S706, it is determined to configure the output circuit with one of the plurality of parameter configurations according to the comparison result, so as to enable the output circuit to perform data transmission in an operation state adapted to the current rate. Specifically, when the detected current rate is higher than the rate threshold value (i.e. the comparison result is "1"), the output circuit is configured with a first parameter configuration (i.e. pre-emphasis, equalizer or CDR circuit is enabled) by the signal configuration unit, so as to enable the output circuit to perform data transmission in an operating state adapted to the current rate. When the detected current rate is lower than the rate threshold value (namely, the comparison result is '0'), the output circuit is configured by the signal configuration unit with a second parameter configuration (namely, the pre-emphasis, the equalizer or the CDR circuit is not enabled) so as to enable the output circuit to carry out data transmission in an operating state adapting to the current rate.
From the above description in conjunction with the accompanying drawings, those skilled in the art will also appreciate that embodiments of the present disclosure may also be implemented by software programs. The present disclosure thus also provides a computer program product. The computer program product may be used to implement the method for accommodating multiple transmission rates of an active cable described in conjunction with fig. 7 of the present disclosure.
It should be noted that while the operations of the disclosed methods are depicted in the drawings in a particular order, this does not require or imply that these operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results. Rather, the steps depicted in the flowcharts may change the order of execution. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
It should be understood that when the claims of the present disclosure, and when the terms first, second, third, fourth, etc. are used in the specification and drawings, they are used only to distinguish one object from another, and not to describe a particular order. The terms "comprises" and "comprising," when used in the specification and claims of this disclosure, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the disclosure herein is for the purpose of describing particular embodiments only, and is not intended to be limiting of the disclosure. As used in the specification and claims of this disclosure, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the term "and/or" as used in the specification and claims of this disclosure refers to any and all possible combinations of one or more of the associated listed items and includes such combinations.
Although the embodiments of the present disclosure are described above, the descriptions are only examples for facilitating understanding of the present disclosure, and are not intended to limit the scope and application scenarios of the present disclosure. It will be understood by those skilled in the art of the present disclosure that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure, and that the scope of the disclosure is to be limited only by the appended claims.
Claims (10)
1. An apparatus for compatible multiple transmission rates of an active cable, wherein the active cable includes front-end circuitry and output circuitry, and the apparatus comprising:
a rate detection unit connected with an output of the front-end circuit and configured to:
detecting the current speed of the output signal of the front-end circuit; and
comparing the current rate with a rate threshold value to obtain a comparison result;
a signal configuration unit connected to the rate detection unit and the output circuit, respectively, and configured to:
receiving the comparison result from the rate detection unit; and
and determining to configure the output circuit with one of a plurality of parameter configurations according to the comparison result so as to enable the output circuit to carry out data transmission in an operating state which is adaptive to the current speed.
2. The apparatus of claim 1, wherein the plurality of parameter configurations comprises a first parameter configuration and a second parameter configuration, wherein the first parameter configuration corresponds to a first output rate and the second parameter configuration corresponds to a second output rate, and in determining to configure the output circuit with one of the plurality of parameter configurations, the signal configuration unit is to:
and determining to configure the output circuit with the first parameter configuration or the second parameter configuration according to the comparison result so as to enable the output circuit to carry out data transmission in an operating state which is adaptive to the first output rate or the second output rate.
3. The apparatus of claim 2, wherein the signal configuration unit is to determine, based on the comparison result, whether to configure the output circuit with the first parameter or the second parameter, to:
configuring the output circuit with the first parameter configuration in response to the current rate being above a rate threshold value; or
Configuring the output circuit with the second parameter configuration in response to the current rate being below a rate threshold value.
4. The apparatus of claim 3, wherein the first parameter configuration relates to enablement of pre-emphasis, equalizer, and/or clock data recovery circuitry, and the second parameter configuration relates to non-enablement of pre-emphasis, equalizer, and/or clock data recovery circuitry.
5. The apparatus of claim 3, wherein the signal configuration unit comprises a micro control unit for reading the comparison result from the rate detection unit and configuring the output circuit accordingly in accordance with the comparison result.
6. The apparatus of claim 1, wherein the active cable comprises at least a display interface active cable, the display interface active cable comprises four high-speed signal transmission channels, and each of the high-speed signal transmission channels comprises the front-end circuitry and the output circuitry, and:
the speed detection unit is connected with the output end of the front-end circuit of the first high-speed signal transmission channel and is used for:
detecting the current speed of the output signal of the front-end circuit of the first high-speed signal transmission channel connected with the front-end circuit; and
comparing the current rate with a rate threshold value to obtain a comparison result;
the signal configuration unit is connected with the rate detection unit and the output circuit of each high-speed signal transmission channel and is used for:
receiving the comparison result from the rate detection unit; and
and determining to configure the output circuit of each high-speed signal transmission channel with one of a plurality of parameter configurations according to the comparison result so as to enable the output circuit to carry out data transmission in an operating state which is adaptive to the current speed.
7. The apparatus of claim 1, wherein the active cable further comprises a high definition multimedia interface active cable, the high definition multimedia interface active cable comprising four high speed signal transmission channels, and the four high speed signal transmission channels each comprising the front end circuitry, the output circuitry, and:
the speed detection unit is connected with the output end of the front-end circuit of any one of the high-speed signal transmission channels and is used for:
detecting the current speed of the output signal of the front-end circuit of any one of the high-speed signal transmission channels connected with the front-end circuit; and
comparing the current rate with a rate threshold value to obtain a comparison result;
the signal configuration unit is connected with the rate detection unit and the output circuit of each high-speed signal transmission channel and is used for:
receiving the comparison result from the rate detection unit; and
and determining to configure the output circuits of the four high-speed signal transmission channels with one of a plurality of parameter configurations according to the comparison result so as to enable the output circuits to carry out data transmission in an operating state which is adaptive to the current speed.
8. An active cable device comprising:
an active cable; and
the apparatus of any of claims 1-7, and configured to be compatible with multiple transmission rates of the active cable.
9. A method for compatible multiple transmission rates of an active cable, the active cable including a front-end circuit and an output circuit, and the method comprising:
detecting the current speed of the output signal of the front-end circuit;
comparing the current rate with a rate threshold value to obtain a comparison result; and
and determining to configure the output circuit with one of a plurality of parameter configurations according to the comparison result so as to enable the output circuit to carry out data transmission in an operating state which is adaptive to the current speed.
10. A computer readable storage medium comprising program instructions for accommodating multiple transmission rates of an active cable, which when executed by one or more processors, cause the method of claim 9 to be implemented.
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