CN107301148A - USB Type C interface modular converter, system and connection method - Google Patents
USB Type C interface modular converter, system and connection method Download PDFInfo
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Abstract
The embodiment of the invention discloses a kind of USB Type C interface modular converter, system and transmission establishment of connection method, the DDC of HDMI sources data-signal and clock signal are directly carried out to the output of signal by cross bar switch, so, the communication with upstream and downstream HDMI equipment can be realized by direct-connected mode, improve the real-time and reliability of DDC communications, and by intersecting the exchange of the data-signal and clock signal transmission passage of realizing DDC, the matching of port when realizing direction of insertion different from USB Type C interface.In addition, by USB Type C interface converting systems, the conversion without other videos, it is possible to achieve the transmission between traditional HDMI equipment, and with faster transmission speed and stronger transmittability.
Description
Technical Field
The invention relates to the field of video data transmission, in particular to a USB Type-C interface conversion module, a system and a transmission connection establishing method.
Background
With the rapid development of electronic technology, the functions of electronic devices are increasing continuously, and various interfaces are customized on the electronic devices to facilitate connection with other devices.
The USB Type-C interface has the characteristics of higher transmission speed, stronger power transmission capability, support of double-sided plugging and the like, is a mainstream choice of the current electronic equipment interface, and is equipped with the USB Type-C interface on more and more electronic equipment. For a long time, the video transmission still mainly uses HDMI (High Definition multimedia interface), and the interface conversion between the conventional HDMI and the USB Type-C provides a solution for the interconnection between the conventional HDMI device and the USB Type-C interface device.
At present, the interface conversion between HDMI and USB Type-C is performed at a single end, a source signal of HDMI is converted into a USB Type-C interface signal at a signal source end, the HDMI is still an HDMI interface at a signal receiving end, and the conversion at the source end is based on I2The DDC (Display Data Channel) communication of the C (Inter-Integrated Circuit) protocol is converted into the CC communication based on the USB-PD protocol, and the communication mechanism of the HDMI encrypted signal has the characteristics of real-time performance and short Data validity time, which may cause communication failure and poor transmission reliability. With the continuous development of video applications, the requirements of many applications on video transmission speed and display quality are continuously increased, for example, in a VR (Virtual Reality) technology, at a display end, that is, a signal receiving end, a power supply current carried by a conventional HDMI interface is limited, and good interactive performance cannot be brought to a user.
Disclosure of Invention
The invention provides a USB Type-C interface conversion module, a system and a transmission connection establishing method, which improve the communication reliability.
The utility model provides a USBType-C interface conversion module, is applied to HDMI source end one side, includes:
the input end of the connection detection and signal conversion unit is respectively used for connecting a CEC signal port and an HPD signal port of an HDMI source end, and the output end of the connection detection and signal conversion unit is respectively used for connecting two configuration channels of a USB Type-C socket, and is used for carrying out mutual conversion between CEC signals, HPD signals and USB PD messages, discovering and confirming an HDMI transmission mode, and detecting the plugging state and the plugging direction of the USB Type-C interface;
the input end of the cross switch unit is respectively used for connecting a clock signal DSCL port and a data signal DSDA port of a DDC (direct digital interface) of an HDMI (high-definition multimedia interface) source end, and the output end of the cross switch unit is respectively used for connecting two sideband channels of a USB Type-C socket and is used for connecting the input end to the output end directly or after being crossed according to the insertion direction;
and the input end of the signal transmission unit is respectively used for connecting a video signal port of the HDMI source end, the output end of the signal transmission unit is respectively used for connecting a data port of the USB Type-C socket and is used for transmitting the video signal of the HDMI source end, and the input end is respectively connected to the output end corresponding to the insertion direction by exchanging transmission channels according to the insertion direction signal.
Optionally, the connection detecting and signal converting unit includes: the device comprises a detection unit, and a CEC signal conversion unit, an HPD signal conversion unit and a transmission mode discovery and confirmation unit which are respectively connected with the detection unit; wherein,
a CEC signal conversion unit, the input end of which is used for connecting to the CEC signal port of the HDMI source end and is used for interconversion between the CEC signal and the USB PD message;
the input end of the HPD signal conversion unit is connected to an HPD signal port of the HDMI source end and used for mutual conversion between an HPD signal and a USB PD message;
a transmission mode discovery and confirmation unit for determining whether to enter an HDMI transmission mode through a USB PD message and confirming establishment of the HDMI transmission mode after the USB Type-C plug is inserted;
and the output end of the detection unit is connected to the two configuration channels and used for detecting the connection state and the insertion direction of the USB Type-C interface.
Optionally, the input end of the signal transmission unit is further provided with a signal regeneration unit for enhancing the video signal of the HDMI source.
The utility model provides a USBType-C interface conversion module, is applied to HDMI receiving terminal one side, includes:
the input ends of the detection and signal conversion units are respectively used for connecting two configuration channels of the USB Type-C socket, and the output ends of the detection and signal conversion units are respectively used for connecting a CEC signal port and an HPD signal port of an HDMI receiving end, and are used for carrying out mutual conversion between CEC signals, HPD signals and USB PD messages, discovering and confirming an HDMI transmission mode, and detecting the plugging state and the plugging direction of the USB Type-C interface;
the input end of the cross switch unit is respectively used for connecting two sideband channels of the USB Type-C socket, the output end of the cross switch unit is respectively used for connecting a clock signal DSCL port and a data signal DSDA port of a DDC (direct digital interface) of an HDMI (high-definition multimedia interface) receiving end, and the input end is directly or cross-connected to the output end according to the insertion direction;
and the input end of the signal transmission unit is respectively used for connecting a data port of a USB Type-C socket, the output end of the signal transmission unit is respectively used for connecting a video signal port of an HDMI receiving end, the signal transmission unit is used for transmitting a video signal to an HDMI transmitting end, and the input end is respectively connected to the output end corresponding to the insertion direction by exchanging transmission channels according to the insertion direction signal.
Optionally, the connection detecting and signal converting unit includes: the device comprises a detection unit, and a CEC signal conversion unit, an HPD signal conversion unit and a transmission mode discovery and confirmation unit which are respectively connected with the detection unit; wherein,
the input end of the detection unit is connected to the two configuration channels and used for detecting the connection state and the insertion direction of the USB Type-C interface;
the CEC signal conversion unit is connected with a CEC signal port of the HDMI source end at the output end and used for interconversion between a CEC signal and a USB PD message;
the output end of the HPD signal conversion unit is connected to an HPD signal port of the HDMI source end and used for mutual conversion between an HPD signal and a USB PD message;
a transmission mode discovery and confirmation unit for determining whether to enter the HDMI transmission mode through the USB PD message after the USB Type-C plug is inserted, and confirming establishment of the HDMI transmission mode.
Optionally, the input of the signal transmission unit is further provided with a signal regeneration unit for enhancement of the transmitted video signal.
A USB Type-C interface conversion system comprises a sending end and a receiving end, wherein the sending end comprises a first USBType-C interface conversion module and a first USB Type-C socket, and the receiving end comprises a second USB Type-C interface conversion module and a second USB Type-C socket; wherein,
the first USB Type-C interface conversion module is the USB Type-C interface conversion module according to any one of claims 1 to 3, wherein an output end of the connection detection and signal conversion unit is connected to two configuration channel interfaces of the first USB Type-C socket, an output end of the cross switch unit is connected to two sideband channels of the first USB Type-C socket, and an output end of the signal transmission unit is connected to a data port of the first USB Type-C socket;
the second USB Type-C interface conversion module is the USB Type-C interface conversion module of any one of claims 4 to 6, wherein the input terminals of the connection detection and signal conversion unit are respectively connected to two configuration channels of the second USB Type-C socket, the input terminals of the cross switch unit are respectively connected to two sideband channels of the second USB Type-C socket, and the input terminals of the signal transmission unit are respectively connected to the data port of the second USB Type-C socket.
A method for establishing transmission connection is based on the USB Type-C interface conversion system, and the method comprises the following steps:
the sending end and the receiving end respectively detect the insertion state and the insertion direction of respective plugs;
when the plug is inserted, the sending end sends a request for entering the HDMI mode to the receiving end through the USB PD message and confirms that the receiving end enters the HDMI mode;
the sending end and the receiving end are respectively connected and matched with the input end and the output end according to the insertion direction of respective plugs;
the sending end sends a state updating request to the receiving end through the USB PD message, the state signal of the receiving end is valid, and the establishment of the HDMI transmission mode is confirmed.
According to the USB Type-C interface conversion module, the system and the method for establishing transmission connection provided by the embodiment of the invention, the DDC data signal and the clock signal at the HDMI source end are directly output through the cross switch, so that the communication with the upstream and downstream HDMI equipment can be realized in a direct connection mode, the real-time performance and the reliability of DDC communication are improved, the exchange of DDC data signal and clock signal transmission channels is realized through cross, and the matching of ports in different insertion directions with the USB Type-C interface is realized. In addition, through the USBType-C interface conversion system, other video conversion is not needed, the transmission between the traditional HDMI equipment can be realized, and the transmission speed and the transmission capability are higher.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIG. 1 is a schematic diagram of the port definition of a USB Type-C receptacle port and plug;
FIG. 2 is a schematic diagram of a USB Type-C blind mate;
fig. 3 is a schematic structural diagram of a transmitting end in a USB Type-C interface conversion system according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a receiving end in a USB Type-C interface conversion system according to an embodiment of the present invention;
fig. 5 is a schematic flow chart illustrating a connection establishment process using the USB Type-C interface conversion system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Just as the description in the background art, the USB Type-C interface has the characteristics of faster transmission speed, stronger power transmission capability, support of double-sided plugging and the like, and is a mainstream choice of the current electronic device interface, more and more electronic devices are equipped with the USB Type-C interface, and support of double-sided plugging is a great characteristic of the USB Type-C interface, and double-sided plugging is also blind plugging in use. In order to better understand the technical scheme of the invention, the port definition and the blind plugging principle of the USB Type-C socket and plug are introduced.
Referring to fig. 1, a diagram a and a diagram B are schematic diagrams of port definitions of a USB Type-C receptacle and a plug, respectively. Wherein, four pairs of high-speed differential pair ports: TX1+/TX1-, TX2+/TX1-, RX1+/RX1-, RX2+/RX2-, is a high-speed data port, supports USB3.1 data transmission in default, is a high-speed data port, can reach the maximum data rate of 10Gb/s, and can be used for transmitting DP or HDMI video data. D +/D-is a data port of normal speed, always used to transfer USB2.0 data. The Side Band channel SBU1/SBU2(SBU, Side Band Use) is an auxiliary signal port. CC1/CC2 (CC) is configured Channel port, and determines the plug insertion direction by determining which port of CC1 and CC2 is connected to the CC signal terminal of the plug. VBUS and GND are power and ground ports.
When the plug is inserted into the socket in the forward direction, as shown in (a) of fig. 2, the ports of the plug and the socket correspond to each other, and when the plug is inserted into the socket in the reverse direction, the positions of the ports of the plug change, and data channels need to be exchanged, as shown in (B) of fig. 2, to correspond to the corresponding data channels on the socket, wherein TX1+/TX 1-needs to be exchanged with TX2+/TX1-, RX1+/RX 1-needs to be exchanged with RX2+/RX2-, and SBU1 needs to be exchanged with SBU 2.
The foregoing introduces the principle of blind insertion and signals of each port of the USB TYPE-C, and the following describes in detail the USB TYPE-C interface conversion module and the system according to the embodiment of the present invention.
As shown in fig. 3 and fig. 4, are respectively schematic structural diagrams of a transmitting end 10 and a receiving end 20 in a USB Type-C interface conversion system according to an embodiment of the present invention, where the USB Type-C interface conversion system is composed of the transmitting end 10 and the receiving end 20.
Referring to fig. 3, the transmitting terminal 10 includes a first USB Type-C interface conversion module 100 and a first USB Type-C socket 105, and the transmitting terminal 10 is disposed on one side of the HDMI source, and is connected to the HDMI source device 104, and uses the HDMI source signal as an input signal.
The receiving terminal 20 includes a second USB Type-C interface conversion module 200 and a second USB Type-C socket 205, and the receiving terminal 20 is disposed on one side of the HDMI receiving terminal, and is connected to the HDMI receiving terminal device 204, and outputs HDMI data to the HDMI receiving terminal device 204 by using a signal from the transmitting terminal USB Type-C interface conversion module as an input. The transmitting end 10 and the receiving end 20 are connected through a cable with USB Type-C plugs at two ends.
The HDMI source device 104 may be, for example, a personal computer, a notebook computer, a tablet computer, a server, a mobile phone or other devices with an HDMI data source, and the HDMI sink device 204 may be a television, a display screen, VR glasses or other devices with an HDMI data receiving function. In a typical application, the HDMI source device 104 may be a VR data source server, and the HDMI sink device 204 may be VR glasses. The HDMI source device and the HDMI sink device are only examples, and the embodiments of the present invention do not limit this.
The HDMI signal includes a Display Data Channel (DDC) signal, a video Data and video clock signal, a Hot Plug Detect (HPD) signal and a Consumer Electronics Control (CEC) signal, wherein the DDC signal includes a DDC Data Signal (DSDA) and a DDC clock signal (DSCL), the video Data signal includes three pairs of differential Data respectively designated as D2+/D2-, D1 +/D1-and D0+/D0-, and the video clock signal includes a pair of differential Data CK +/CK-.
The first USB Type-C interface conversion module 100 includes a connection detection and signal conversion unit 101, a cross bar switch unit 102, and a signal transmission unit 103.
The input end of the connection detection and signal conversion unit 101 is respectively connected with a CEC signal and an HPD signal, the output end is respectively used for being connected with ports CC1 and CC2 of a USB Type-C configuration channel and interfaces A5 and B5 of the first USB Type-C socket 105, the unit 101 is used for mutual conversion between the CEC signal and the HPD signal and USB PD messages, discovery and confirmation of HDMI transmission modes, detection of plugging state and plugging direction of the USB Type-C interface and output of plugging direction signals. Specifically, the connection detection and signal conversion unit 101 includes a CEC signal conversion unit 101a, an HPD signal conversion unit 101b, a detection unit 101c, and a transmission mode discovery and confirmation unit 101d, and the CEC signal conversion unit, the HPD signal conversion unit, and the transmission mode discovery and confirmation unit are connected to each other in the detection unit, respectively.
The CEC signal conversion unit 101a is configured to convert a CEC signal and a USB PD (Power Delivery protocol) message to each other, and transmit the CEC signal and the USB PD message through a configuration channel CC1 or CC 2; the HPD signal conversion unit 101b is used for mutual conversion between the HPD signal and the USB PD message, and transmits the HPD signal and the USB PD message through the configuration channel CC1 or CC 2; the detection unit 101C is used for detecting the connection state and the insertion direction of the USB Type-C interface and outputting an insertion direction signal; a transmission mode discovery and confirmation unit 101d for determining whether to enter the HDMI transmission mode through a USB PD message transmitted through the configuration channel CC1 or CC2 after the plug of the USB Type-C is inserted, and confirming establishment of the HDMI transmission mode. Specifically, when the plug is inserted, the insertion direction of the plug is determined by determining which port of CC1 and CC2 is connected to the CC signal terminal of the plug, and in a specific embodiment, when the insertion direction signal flip _ en is 0, it indicates forward insertion, and when the flip _ en is 1, it indicates reverse insertion.
The cross switch unit 102 is used for directly connecting the clock signal DSCL port and the data signal DSDA port of the DDC of the HDMI source to the corresponding side channel ports SBU1 and SBU2, respectively, i.e. directly to the side channel SBU1 and SBU2 of the output, respectively, or crossing the transmission channels of the clock signal DSCL port and the data signal DSDA port of the DDC of the HDMI source to connect to the side channel SBU2 and SBU1 of the output, respectively, when different insertion direction signals are used. The side-band channels SBU1, SBU2 are connected to interfaces A8, B8 of the first USB Type-C receptacle, respectively.
In a specific embodiment, when the insertion direction signal flip _ en is 0 and is a forward insertion, the ports of the side-band channels SBU1 and SBU2 are directly and correspondingly connected to the DDC clock signal DSCL port and the DDC data signal DSDA port, respectively; when the insertion direction signal flip _ en is 1, for reverse insertion, the DDC clock signal DSCL port and the DDC data signal DSDA port are switched, so that the DDC data signal DSCL port and the DDC clock signal DSCL port are directly connected to the side-band channels SBU1 and SBU2 respectively.
In the embodiment of the present invention, on the two output ports of the crossbar switch unit 102, the original signals of the DDC data signal DSDA and the clock signal DSCL at the HDMI source are not converted by any USB PD, that is, DDC communication is realized in a direct connection manner, so that the real-time performance and the communication efficiency of communication are improved, an error caused by transmission conversion is also avoided, and the communication reliability is improved.
And a signal transmission unit 103 for performing video signal transmission of the HDMI source, and connecting video signal ports to output ports corresponding to the insertion directions, respectively, when the insertion direction signals are different.
The video signals of the HDMI transmitted by the signal transmission unit 103 include video data signals and video clock signals, generally, the video data signals of the HDMI include three data differential signals D2+/D2-, D1+/D1-, D0 +/D0-and one clock differential signal CK +/CK-, the output ports of the signal transmission unit 103 correspond to four pairs of high-speed differential pair ports RX1+/RX1-, RX2+/RX2-, TX1+/TX1-, TX2+/TX 2-of USB Type-C, respectively, the four pairs of high-speed differential pair ports are connected to the data interfaces B11/B10, a11/a10, a2/A3, B2/B3 of the first USB Type-C socket 105, respectively, and when the insertion directions of the plugs are different, the video signals of the HDMI are connected to different output ports respectively, the video signal ports can be connected to the corresponding output ports by performing switching of the transmission channels according to the insertion direction signal, respectively.
In a specific embodiment, when the insertion direction signal flip _ en is 0 and is a forward insertion, the ports of the three data differential signals D2+/D2-, D0-/D0+, D1 +/D1-and the one clock differential signal CK-/CK + respectively correspond to four pairs of high-speed differential pair ports RX1+/RX1-, RX2+/RX2-, TX1+/TX1-, TX2+/TX 2-connected to the USBType-C; when the insertion direction signal flip _ en is 1, when the insertion direction signal flip _ en is inserted reversely, the transmission channels are redistributed, the transmission channel to the port RX1+/RX 1-is exchanged with the transmission channel to the port RX2+/RX2-, and the transmission channel to the port TX1+/TX 1-is exchanged with the transmission channel to the port TX2+/TX2-, so that the data ports of the three-way data differential signal D2+/D2-, D0-/D0+, D1 +/D1-and the one-way clock differential signal CK-/CK + are respectively connected to the four pairs of high-speed differential pair ports RX2+/RX2-, RX1+/RX1-, TX2+/TX2-, TX1+/TX 1-of the USB Type-C.
Further, the signal transmission unit 103 may further include a signal reproduction unit BUF for enhancement of the video signal of the HDMI. By enhancing the transmitted video signal, the attenuation of the signal caused by overlong transmission cable is avoided, and the quality of signal transmission is further improved. The input and output terminals of the signal transmission unit 103 may be provided with coupling capacitors 107, 106, respectively.
It can be understood that the first USB Type-C interface conversion module 100 may be an independent chip or a module formed by a plurality of chips, and the implementation form thereof is not limited by the present invention.
The transmitting end 10 and the first USB Type-C interface conversion module 100 used for the transmitting end 10 according to the embodiment of the present invention are described in detail above, and the second USB Type-C interface conversion module 200 in the receiving end 20 is an inverse module of the first USB Type-C interface conversion module 100, and the first USB Type-C interface conversion module 100 and the second USB Type-C interface conversion module 200 are functionally inverse to each other, and each constituent unit of the second USB Type-C interface conversion module 200 will be described in detail below.
Referring to fig. 4, the second USB Type-C interface conversion module 200 includes a connection detection and signal conversion unit 201, a cross switch unit 202, and a signal transmission unit 203, which are functionally reciprocal to corresponding modules in the first USB Type-C interface conversion module 100.
The input terminals of the detection and signal conversion unit 201 are respectively used for connecting the ports of the configuration channels CC1 and CC2 of the USB Type-C, the ports of the CC1 and CC2 are respectively connected to the ports a5 and B5 of the configuration channel of the second USB Type-C socket 205, and the detection and signal conversion unit 201 is used for interconversion between CEC signals and HPD signals and USB PD messages, discovery and confirmation of HDMI transmission mode and transmission of signals, and detecting the plugging state and plugging direction of the USB Type-C interface and outputting a plugging direction signal. Specifically, the connection detection and signal conversion unit 201 includes a CEC signal conversion unit 201a, an HPD signal conversion unit 201b, a detection unit 201c, and a transmission mode discovery and confirmation unit 201d, and the CEC signal conversion unit, the HPD signal conversion unit, and the transmission mode discovery and confirmation unit are connected to each other in the detection unit, respectively. .
Wherein, the CEC signal converting unit 201a is used for interconversion between a CEC signal and a USB PD message, and is transmitted through the configuration channel CC1 or CC 2; the HPD signal conversion unit 201b is used for interconversion of the HPD signal of the HDMI and the USB PD message, and is transmitted through the configuration channel CC2 or CC 1; the detecting unit 201C is configured to detect a connection state and an insertion direction of the second USB Type-C interface, and output an insertion direction signal; a transmission mode discovery and confirmation unit 101d for determining whether to enter the HDMI transmission mode through a USB PD message transmitted through the configuration channel CC1 or CC2 after the plug of the USB type-C is inserted, and confirming establishment of the HDMI transmission mode. Specifically, when the plug is inserted, the insertion direction of the plug is determined by determining which port of CC1 and CC2 is connected to the CC signal terminal of the plug, and in a specific embodiment, when the insertion direction signal flip _ en is 0, it indicates forward insertion, and when the flip _ en is 1, it indicates reverse insertion.
And the input ends of the cross switch unit 202 are respectively used for connecting the ports of the SBU1 and SBU2 of the USB Type-C sideband channels, and the ports of the SBU1 and SBU2 are connected to the sideband channels A8 and B8 of the second USB Type-C socket 205 and are used for directly transmitting the received DDC data signal DSDA and the DDC clock signal DSC.
The cross switch unit 202 is used for directly connecting the ports of the side-band channels SBU1 and SBU2 to the corresponding output ports respectively when different insertion direction signals are used, namely directly connecting the ports of the side-band channels SBU1 and SBU2 to the DDC clock signal DSCL port and DDC data signal DSDA port of the output end respectively, or crossing the transmission channels of the ports of the side-band channels SBU1 and SBU2 to connect to the DDC data signal DSDA port and DDC clock signal DSCL port of the output end respectively.
In a specific embodiment, when the insertion direction signal flip _ en is 0 and is a forward insertion, the ports SBU1 and SBU2 of the sideband channels are directly connected to the DDC clock signal DSCL port and the DDC data signal DSDA port, respectively; when the insertion direction signal flip _ en is 1, for reverse insertion, the transmission channels of the side-band channels SBU1, SBU2 are switched, so that the ports of the side-band channels SBU1, SBU2 are connected directly to the DDC data signal DSDA port and DDC clock signal DSCL port, respectively.
Thus, from the transmitting end 100 to the receiving end 200, the DDC data signal DSDA and the clock signal DSCL original signals of the HDMI source are not converted by any USB PD, that is, DDC communication of the upstream and downstream HDMI devices is realized by direct connection, so that the real-time performance and communication efficiency of communication are improved, errors caused by transmission conversion are also avoided, and the communication reliability is improved.
And a signal transmission unit 203 for transmitting the video signal to the HDMI transmitting end and connecting video signal ports to output ports corresponding to the insertion directions, respectively, when the insertion direction signals are different.
The input end of the signal transmission unit 203 is used for connecting video signal ports of USB Type-C, the ports are respectively connected to the data interfaces B11/B10, a11/a10, a2/A3 and B2/B3 of the second USB Type-C socket 205, the video signals from the USB Type-C of the transmitting end are received, corresponding to the transmitting end 10, the video signals comprise video data signals and video clock signals, and generally comprise four pairs of high-speed differential pair signals, and the input ports are respectively used for being connected with four pairs of high-speed differential pair ports RX1+/RX1-, RX2+/RX2-, TX1+/TX1-, TX2+/TX 2-; the output ports of the three-way differential data signal interface are respectively used for being connected to the ports of three-way data differential signals D2+/D2-, D1+/D1-, D0 +/D0-and one-way clock differential signal CK +/CK-of the HDMI receiving terminal equipment. When the plug insertion directions are different, the USB Type-C input ports are respectively and correspondingly connected to different output ports, and the video signal ports are connected to the corresponding output ports by distributing transmission channels according to the plug insertion direction signals.
In a specific embodiment, when the insertion direction signal flip _ en is 0 and is a forward insertion, the four pairs of high-speed differential pair data ports RX1+/RX1-, RX2+/RX2-, TX1+/TX1-, TX2+/TX 2-are respectively connected to the ports D1+/D1-, CK-/CK +, D2+/D2-, D0-/D0+ of the HDMI sink device; when the insertion direction signal flip _ en is 1, when the insertion direction signal flip _ en is inserted reversely, the transmission channels are redistributed, the transmission channels transmitted to the ports D1 +/D1-and the ports CK-/CK + are exchanged, and the transmission channels transmitted to the ports D2 +/D2-and the ports D0-/D0+ are exchanged, so that four pairs of high-speed differential pair data ports RX1+/RX1-, RX2+/RX2-, TX1+/TX1-, TX2+/TX 2-are correspondingly connected to the output ports CK-/CK +, D1+/D1-, D0-/D0+, D2 +/D2-.
Further, the signal transmission unit 203 may further include a signal reproduction unit BUF for enhancement of the video signal of the HDMI. By enhancing the transmitted video signal, the attenuation of the signal caused by overlong transmission cable is avoided, and the quality of signal transmission is further improved. The input and output terminals of the signal transmission unit 203 may be provided with coupling capacitors 206, 207, respectively.
It is understood that the second USB Type-C interface conversion module 200 may be an independent chip or a module formed by a plurality of chips, and the implementation form thereof is not limited by the present invention.
The USB Type-C interface conversion system and the USB Type-C interface conversion modules 100 and 200 at the transmitting end and the receiving end of the embodiment of the present invention are described in detail above. Based on the USB Type-C interface conversion system, USB Type-C interface conversion modules 100 and 200 of the transmitting end and the receiving end are connected by a cable with a USB plug, and after a transmission connection is established, the HDMI DDC/CEC communication and data transmission stage is started.
Specifically, when establishing the connection, the transmitting end and the receiving end communicate through a USB PD message, and as shown in fig. 5, the step of establishing the transmission connection includes:
in steps 310a and 301b, the transmitting end and the receiving end respectively detect the insertion state and the insertion direction of the respective plugs.
The insertion state and the insertion direction of the end plug can be detected by the detection unit at the transmitting end, and the insertion state and the insertion direction of the end plug can be detected by the detection voltage at the receiving end.
In steps 302 and 303, when the plug is plugged, the sending end sends a request for entering the HDMI mode to the receiving end through the USB PD message, and confirms that the receiving end enters the HDMI mode.
In a specific application, the receiving end can be confirmed to enter the HDMI mode through interaction of a plurality of USB PD messages.
And step 304a and step 304b, the transmitting end and the receiving end respectively carry out connection matching of the input end and the output end according to the insertion direction of the respective plug.
According to the insertion direction of a plug at a sending end, a cross switch unit and a signal transmission unit at the sending end are used for connecting and matching an input end and an output end; according to the insertion direction of the receiving end plug, the cross switch unit and the signal transmission unit of the receiving end are used for connecting and matching the input end and the output end.
Then, in steps 305 and 306, the sending end sends a status update request to the receiving end through the USB PD message, and the status signal of the receiving end is valid, so as to confirm the establishment of the HDMI transmission mode.
In a specific application, whether the status signal is valid or not can be confirmed by the HPD signal, and when the HPD in the response signal of the receiving end is high, the status signal of the receiving end is considered to be valid, and the establishment of the HDMI transmission mode can be confirmed.
After the establishment of the HDMI transmission mode is confirmed, the phases of HDMI DDC/CEC communication and data transmission can be entered.
The above-described system embodiments are merely illustrative, wherein the modules or units described as separate parts may or may not be physically separate, and the parts displayed as modules or units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (8)
1. The utility model provides a USBType-C interface conversion module, is applied to HDMI source end one side, its characterized in that includes:
the input end of the connection detection and signal conversion unit is respectively used for connecting a CEC signal port and an HPD signal port of an HDMI source end, and the output end of the connection detection and signal conversion unit is respectively used for connecting two configuration channels of a USB Type-C socket, and is used for carrying out mutual conversion between CEC signals, HPD signals and USB PD messages, discovering and confirming an HDMI transmission mode, and detecting the plugging state and the plugging direction of the USB Type-C interface;
the input end of the cross switch unit is respectively used for connecting a clock signal DSCL port and a data signal DSDA port of a DDC (direct digital interface) of an HDMI (high-definition multimedia interface) source end, and the output end of the cross switch unit is respectively used for connecting two sideband channels of a USB Type-C socket and is used for connecting the input end to the output end directly or after being crossed according to the insertion direction;
and the input end of the signal transmission unit is respectively used for connecting a video signal port of the HDMI source end, the output end of the signal transmission unit is respectively used for connecting a data port of the USB Type-C socket and is used for transmitting the video signal of the HDMI source end, and the input end is respectively connected to the output end corresponding to the insertion direction by exchanging transmission channels according to the insertion direction signal.
2. The interface conversion module of claim 1, wherein the connection detection and signal conversion unit comprises: the device comprises a detection unit, and a CEC signal conversion unit, an HPD signal conversion unit and a transmission mode discovery and confirmation unit which are respectively connected with the detection unit; wherein,
a CEC signal conversion unit, the input end of which is used for connecting to a CEC signal port of the HDMI source end and is used for interconversion between CEC signals and USBPD messages;
the input end of the HPD signal conversion unit is connected to an HPD signal port of the HDMI source end and used for mutual conversion between an HPD signal and a USBPD message;
a transmission mode discovery and confirmation unit for determining whether to enter an HDMI transmission mode through a USB PD message and confirming establishment of the HDMI transmission mode after the USB Type-C plug is inserted;
and the output end of the detection unit is connected to the two configuration channels and used for detecting the connection state and the insertion direction of the USB Type-C interface.
3. The interface conversion module of claim 1, wherein the input terminal of the signal transmission unit is further provided with a signal regeneration unit for enhancing the video signal at the HDMI source.
4. The utility model provides a USBType-C interface conversion module, is applied to HDMI receiving terminal one side, its characterized in that includes:
the input ends of the detection and signal conversion units are respectively used for connecting two configuration channels of the USB Type-C socket, and the output ends of the detection and signal conversion units are respectively used for connecting a CEC signal port and an HPD signal port of an HDMI receiving end, and are used for carrying out mutual conversion between CEC signals, HPD signals and USB PD messages, discovering and confirming an HDMI transmission mode, and detecting the plugging state and the plugging direction of the USB Type-C interface;
the input end of the cross switch unit is respectively used for connecting two sideband channels of the USB Type-C socket, the output end of the cross switch unit is respectively used for connecting a clock signal DSCL port and a data signal DSDA port of a DDC (direct digital interface) of an HDMI (high-definition multimedia interface) receiving end, and the input end is directly or cross-connected to the output end according to the insertion direction;
and the input end of the signal transmission unit is respectively used for connecting a data port of a USB Type-C socket, the output end of the signal transmission unit is respectively used for connecting a video signal port of an HDMI receiving end, the signal transmission unit is used for transmitting a video signal to an HDMI transmitting end, and the input end is respectively connected to the output end corresponding to the insertion direction by exchanging transmission channels according to the insertion direction signal.
5. The interface conversion module of claim 4, wherein the connection detection and signal conversion unit comprises: the device comprises a detection unit, and a CEC signal conversion unit, an HPD signal conversion unit and a transmission mode discovery and confirmation unit which are respectively connected with the detection unit; wherein,
the input end of the detection unit is connected to the two configuration channels and used for detecting the connection state and the insertion direction of the USB Type-C interface;
the CEC signal conversion unit is connected with a CEC signal port of the HDMI source end at the output end and used for interconversion between a CEC signal and a USBPD message;
the output end of the HPD signal conversion unit is connected to an HPD signal port of the HDMI source end and used for mutual conversion between the HPD signal and the USBPD message;
a transmission mode discovery and confirmation unit for determining whether to enter the HDMI transmission mode through the USB PD message after the USB Type-C plug is inserted, and confirming establishment of the HDMI transmission mode.
6. The interface conversion module according to claim 4, wherein the input terminal of the signal transmission unit is further provided with a signal reproduction unit for enhancement of the transmitted video signal.
7. The USBType-C interface conversion system is characterized by comprising a sending end and a receiving end, wherein the sending end comprises a first USBType-C interface conversion module and a first USBType-C socket, and the receiving end comprises a second USBType-C interface conversion module and a second USBType-C socket; wherein,
the first USB Type-C interface conversion module is the USB Type-C interface conversion module according to any one of claims 1 to 3, wherein an output end of the connection detection and signal conversion unit is connected to two configuration channel interfaces of the first USB Type-C socket, an output end of the cross switch unit is connected to two sideband channels of the first USB Type-C socket, and an output end of the signal transmission unit is connected to a data port of the first USB Type-C socket;
the second USB Type-C interface conversion module is the USB Type-C interface conversion module of any one of claims 4 to 6, wherein the input terminals of the connection detection and signal conversion unit are respectively connected to two configuration channels of the second USB Type-C socket, the input terminals of the cross switch unit are respectively connected to two sideband channels of the second USB Type-C socket, and the input terminals of the signal transmission unit are respectively connected to the data port of the second USB Type-C socket.
8. A method for establishing a transmission connection, based on the USB Type-C interface conversion system of claim 7, wherein the method comprises:
the sending end and the receiving end respectively detect the insertion state and the insertion direction of respective plugs;
when the plug is inserted, the sending end sends a request for entering the HDMI mode to the receiving end through the USB PD message and confirms that the receiving end enters the HDMI mode;
the sending end and the receiving end are respectively connected and matched with the input end and the output end according to the insertion direction of respective plugs;
the sending end sends a state updating request to the receiving end through the USB PD message, the state signal of the receiving end is valid, and the establishment of the HDMI transmission mode is confirmed.
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