CN112463681B - USB hub with resolution switching and processing method thereof - Google Patents
USB hub with resolution switching and processing method thereof Download PDFInfo
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- CN112463681B CN112463681B CN201910840716.5A CN201910840716A CN112463681B CN 112463681 B CN112463681 B CN 112463681B CN 201910840716 A CN201910840716 A CN 201910840716A CN 112463681 B CN112463681 B CN 112463681B
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- 238000004891 communication Methods 0.000 claims abstract description 45
- 230000002093 peripheral effect Effects 0.000 claims abstract description 9
- 230000005540 biological transmission Effects 0.000 claims description 103
- 238000000034 method Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000012546 transfer Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0042—Universal serial bus [USB]
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Abstract
The application discloses a USB hub with resolution switching and a processing method thereof, which are applied to the realization of resolution switching without re-plugging the USB hub. The USB hub with resolution switching of the application comprises: the device comprises a first communication interface, a second communication interface, a video output interface, a switching unit, a power input unit, a storage unit and a control unit. The first communication interface is connected with the host end and transmits the target film and the data signal; the second communication interface is connected with the peripheral device and is used for transmitting data signals; the power input unit is electrically connected with the first communication interface or an external transformer; the storage unit is used for recording the current state; if no external power exists, the control unit is switched to a first state and records the first state as a current state; if the external power exists, the control unit is switched from the first state to the second state or the control unit is switched from the second state to the first state, and the control unit updates the current state.
Description
Technical Field
USB hub and processing method thereof, and more particularly, to a USB hub with resolution switching and processing method thereof
Background
With the rapid development of integrated circuits, the demand for large-scale data transmission is increasing. In particular, the related devices of the universal serial bus (Universal Serial Bus, abbreviated as USB) drive various requirements for data storage, transmission and transfer. The transmission bandwidth of the current USB3.0 gen1 and gen2 equipment can reach 5Gbit/s and 10Gbit/s.
Under the high-speed transmission rate, the USB3.0 can realize the purpose of rapid data transmission and can also finish the transmission of heterogeneous signals. The heterogeneous signal refers to a signal transmitted through the USB architecture to further transmit the heterogeneous interface. For example, a USB hub (hub) may have a network interface, an audio interface, or a video interface in addition to a USB interface. Under the high-speed USB3.0 series, the video interface can transmit high-flow video files, especially film files (or game pictures) with 4K resolution. And the display frequencies of the 4K film are further divided into 30Hz and 60Hz.
The USB hubs of the conventional technology can affect the bandwidth when transmitting data or 4K film, so that the transmission rate of the USB hubs can be affected in the transmission process. If the 4K and 60Hz high-resolution film is transmitted, all the bandwidth is used, which results in low transmission efficiency of all the devices.
For the USB hub of the prior art, if the transmission speed is to be changed, the user can only plug the USB hub again, so that the host can redistribute the number of transmission channels. However, for the user, the user cannot directly observe the allocation of the transmission channel from the USB hub after the plug-in. In addition, a proposal (TW I615719) for an automatic switching device and an automatic switching method has been proposed by the manufacturer. The basis of the automatic switching is determined by the host according to the number of transmission channels. The user cannot intuitively check the distribution of the transmission speed from the appearance of the USB hub and the peripheral device.
Disclosure of Invention
The technical problem to be solved by the present application is to switch the transmission speed between high-speed data transmission and high-resolution film.
In order to solve the above-mentioned problems, the present application provides a USB hub with resolution switching, which includes a first communication interface, a second communication interface, a video output interface, a switching unit, a power input unit, a storage unit and a control unit. The first communication interface is connected with the host end and transmits the target film and the data signal, and is provided with a first transmission channel, a second transmission channel and a third transmission channel; the second communication interface is connected with the peripheral device and is used for transmitting data signals, and the second communication interface is provided with a fourth transmission channel and a fifth transmission channel; the video output interface is used for outputting a target film to the display, and is provided with a sixth transmission channel and a seventh transmission channel; the switching unit is used for generating a switching command; the power input unit is electrically connected to the first communication interface and is used for receiving external power; the storage unit is used for recording the current state, and the current state is a first state or a second state; the control unit is electrically connected with the first communication interface, the second communication interface, the video output interface, the switching unit, the power input unit and the storage unit, and determines the connection of the first transmission channel to the fourth transmission channel or the connection of the first transmission channel to the sixth transmission channel when receiving the switching command; when the control unit receives the switching command, the control unit judges whether external power is input or not, and if the external power is not input, the control unit switches to a first state and records the first state as a current state; if external power exists, the control unit is switched from the first state to the second state, or the control unit is switched from the second state to the first state, and the control unit updates the current state.
The application further provides a processing method for resolution switching, which comprises the following steps: connecting the USB hub to the host end and the display for transmitting the target film of the host end to the display; initializing a USB hub and loading a current state; the USB hub plays the target film according to the current state; after receiving the switching command, confirming whether the USB hub is supplied with external power or not; if the current state is the first state and external power is supplied, the USB hub sets the current state as the second state; if the current state is the second state and external power is supplied, the USB hub sets the current state as the first state; if no external power is supplied, the USB hub is initialized.
Compared with the prior art, the USB hub with resolution switching and the processing method thereof are applied to high-speed data and high-resolution film transmission, and a user can select the corresponding transmission speed and the resolution of film playing through the switching unit. The USB hub can be used for changing the transmission speed and the resolution of the film without re-plugging the USB hub.
Of course, it is not necessary for any of the products of the present application to be implemented simultaneously with all of the technical effects described above.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application.
FIG. 1 is a schematic diagram of a system architecture of the present application.
Fig. 2A is a schematic diagram of each transmission channel of the present application.
Fig. 2B is a schematic connection diagram of the first state and each transmission channel of the present application.
Fig. 2C is a schematic connection diagram of the second state and each transmission channel of the present application.
FIG. 3A is a schematic diagram of the operation flow of the present application.
Fig. 3B is a state switching diagram of the present application.
Detailed Description
The embodiments of the present application will be described in detail below with reference to the accompanying drawings and examples, so that the implementation process of how to apply the technical means to solve the technical problems and achieve the technical effects of the present application can be fully understood and implemented accordingly.
Referring to FIG. 1, a schematic diagram of a USB hub 100 according to the present application is shown. The USB hub 100 with resolution switching of the present application includes: the system comprises a first communication interface 110, a second communication interface 120, a video output interface 130, a switching unit 140, a warning unit 150, a power input unit 160, a storage unit 170 and a control unit 180. The control unit 180 is electrically connected to the first communication interface 110, the second communication interface 120, the video output interface 130, the switching unit 140, the alarm unit 150, the power input unit 160 and the storage unit 170.
The first communication interface 110 is electrically connected to the host 210 (host), and the second communication interface 120 is selectively connected to the peripheral device 220. In addition to transmitting the data signal 310 to the peripheral device 220, the host 210 may also transmit the target film 320 to the display 230. In this application, the data and the film are distinguished into two types of signals, namely, the data signal and the target film. The first communication interface 110 and the second communication interface 120 are serial interfaces of a third generation universal serial bus (Universal Serial Bus, usb3. X). The interface type may be a USB type A, type B or type C connector. The video output interface 130 is electrically connected to the display 230. The video output interface 130 may be a high-definition multimedia interface (High Definition Multimedia Interface, HDMI), a DisplayPort (DP) connector or USB Type C (USB Type-C).
The transmission states are defined as a first state and a second state, respectively. Each operation state corresponds to a different configuration mode of the transmission channel, so that the first communication interface 110 and the second communication interface 120 can obtain different combinations of the transmission channels. The data transfer rate of the host 210 in this application is dependent on the USB to DP transfer protocol. The current DP protocol is divided into version 1.2 and version 1.4. The USB protocol types are USB2.0 and USB3.X respectively. The various USB protocols described herein require a combination of different transmission channels, as will be described in greater detail below.
The USB hub 100 of the present application may provide corresponding data transmission rates and Frame Per Second (FPS) of various resolution movies under different transmission states. The aforementioned frame rate may also be expressed in hertz (Hz). The following is a description of film resolution and frame rate, so the prefix "XX resolution" film plus the suffix "(XX Hz)" is used as a distinction. It should be noted that the suffix word also indicates the flow limit of the target movie 320 in addition to the movie frame rate.
The resolution and frame rate of the target movie 320 are defined herein as high-traffic movies and medium-traffic movies, respectively. The distinction between high-traffic movies and medium-traffic movies is determined according to the DP protocol and the USB protocol. Taking the usb3.1gen2 and DP1.4 protocols as an example, high-flow movies may include 4K movies (60 Hz) and 8K movies (30 Hz), and medium-flow movies may include 4K movies (30 Hz), 1080p movies, or 720p movies. Movies in the preamble that are greater than the suffix word frame rate will also be regarded as high-flow movies. For example, the suffix word frame rate of a 4K film (120 Hz) is greater than that of a 4K film (60 Hz), and is therefore also attributed to a high-flow film.
Conversely, movies with a frame rate less than the suffix are considered to be in the category of medium-flow movies. If the usb3.1gen2 and DP1.2 protocols are used, the high-flow movie is a 4K movie (30 Hz), and the medium-flow movie is a 1080p (60 Hz) movie or a 720p movie. The 4K film is 3840×2160 or 4096×2160 pixel film, streaming film or game picture. The 8K film is 7680 x 4320 pixels film, a streaming film or a game picture.
In this application, the first communication interface 110 and the second communication interface 120 have transmission channels, and there are respective connection modes corresponding to the transmission channels in the first state and the second state. For clarity of illustration, the transmission channels of the communication interfaces are defined below for the first communication interface 110 and the second communication interface 120, respectively. The first communication interface 110 has a first transmission channel 191, a second transmission channel 192, and a third transmission channel 193. The second communication interface 120 has a fourth transmission channel 194 and a fifth transmission channel 195. The video output interface 130 has a sixth transmission channel 196 and a seventh transmission channel 197, as shown in fig. 2A. In fig. 2A, the double-headed arrow with solid black lines is a transmission channel, and the dashed black boxes are files to be transferred, for example: a target film 320 or a data signal 310. The first transmission channel 191, the second transmission channel 192, the fourth transmission channel 194, the sixth transmission channel 196 and the seventh transmission channel 197 are formed by differential signal lines of tx±and rx±. The third transmission channel 193 and the fifth transmission channel 195 are formed by the D+ and D-signal lines of USB 2.0.
In the present application, the communication of the first transmission passage 191 to the fourth transmission passage 194 and the sixth transmission passage 196 is controlled by the switching unit 140 and the control unit 180. In other words, the connection of the first transmission channel 191 to the fourth transmission channel 194 or the connection of the first transmission channel 191 to the sixth transmission channel 196 is determined by the control unit 180 according to the current operation status. The user can trigger the switching unit 140 to drive the control unit 180 to switch the transmission path.
When the USB hub 100 is in the first state, the control unit 180 disconnects the first transmission channel 191 from the sixth transmission channel 196. The first transmission channel 191 communicates with the fourth transmission channel 194, and the third transmission channel 193 communicates with the fifth transmission channel 195, as shown in fig. 2B. When the USB hub 100 is in the second state, the control unit 180 connects the first transmission channel 191 and the sixth transmission channel 196. The second transfer passage 192 communicates with a seventh transfer passage 197, and the third transfer passage 193 communicates with a fifth transfer passage 195, as shown in fig. 2C. The transmission channels with communication are indicated by black thick lines in fig. 2B and 2C.
The memory unit 170 is used to record the current state of the USB hub 100. The memory unit 170 may be a programmable read only memory (Programmable read-only memory) or a Flash memory (Flash memory), etc. The current state is either the first state or the second state in this application. The switching unit 140 is electrically connected to the control unit 180. When the switching unit 140 is triggered, a switching command is generated, and the switching command enables the control unit 180 to change the content of the current state and adjust the connection mode of the transmission channel.
The control unit 180, in addition to switching the connection of each transmission channel, forwards a switching command to the host 210, so that the host 210 actively changes the resolution and the frame rate (or hertz) of the target film 320. The switching unit 140 may be a peripheral button or a dial switch. The first state is the transmission architecture of the usb3.X series and the medium-flow movie output by the host 210. The second state is the transmission architecture of the host 210 outputting the high-flow movie and USB 2.0.
When the user triggers the switching unit 140, the control unit 180 determines the content of the current state according to the input power of the power input unit 160. External power 330 may be provided by host 210 in addition to transformer power. If provided by the host 210, the external power 330 is based on the universal serial bus power supply (USB Power Delivery) protocol.
When the control unit 180 switches the current state, the control unit 180 also connects with the alarm unit 150 to prompt the user about the current state of the USB hub 100. The warning unit 150 may be an LED light emitting element or a liquid crystal display screen. For example, when the control unit 180 is in the first state, the warning unit 150 may emit light with a red LED. When the control unit 180 is in the second state, the warning unit 150 may emit light by blue LEDs. Of course, in other application environments, the alarm unit 150 may also use different color lights to indicate the respective states.
To further illustrate the switching of the operation status of the USB hub 100 of the present application, please refer to fig. 3A and fig. 3B, which are an operation flow chart and a status switching chart of the present application. The processing method for resolution switching of the USB hub 100 of the present application comprises the following steps:
step S410: connecting a USB hub to the host side and the display;
step S420: confirming whether the display has EDID;
step S421: if the display does not have the EDID, the USB hub sets the current state as a first state;
step S430: if the display has the EDID, initializing the USB hub;
step S440: loading the current state by the USB hub;
step S450: after receiving the switching command, confirming whether the USB hub is supplied with external power or not;
step S461: if the current state is the first state and external power is supplied, the USB hub sets the current state as the second state;
step S462: if the current state is the second state and external power is supplied, the USB hub sets the current state as the first state; and
step S463: if no external power is supplied, the USB hub performs the initialization of step S440.
First, the USB hub 100 is connected to the host 210 and the display 230, respectively. At the same time, the USB hub 100 may be selectively connected to the peripheral device 220. When the USB hub 100 is connected to the host 210, the control unit 180 enters an initialized power up phase (power up), such as the initialized block in fig. 3B. At initial power-up, the USB hub 100 only draws power from the host side 210. The control unit 180 retrieves the current state from the storage unit 170. The control unit 180 transmits the current status to the host 210, so that the host 210 selects a corresponding target movie 320 format according to the current status.
Then, the control unit 180 requests the display 230 to obtain the extended display capability identification information (Extended display identification data, EDID for short) to identify whether the display 230 supports the playback of the 4K image (or 8K image). If the display 230 has no EDID, the control unit 180 directly uses the first state as the current state. In other words, the video output interface 130 transmits the target film 320 of the medium-flow film to the display 230, and the second communication interface 120 transmits data to the peripheral device 220 at the speed of USB 3.0.
If the display 230 has EDID, the control unit 180 will read the current status of the storage unit 170 and transmit data and movies in the current status. If the current status is the first status, the control unit 180 sends the current status (meaning the first status) to the host 210 through the first communication interface 110, so that the host 210 sends the target movie 320 of the medium-flow movie to the video output interface 130. Similarly, if the current state is the second state, the control unit 180 sends the current state to the host 210, so that the host 210 transmits the target movie 320 corresponding to the high-flow movie. The second communication interface 120 is at a transmission speed of USB 2.0.
Then, when the user triggers the switch unit 140, the control unit 180 and the host 210 receive the switch command. Assuming that the current state is the first state, the control unit 180 immediately determines whether the external power 330 is input to the power input unit 160 after receiving the switch command. If the power input unit 160 receives the external power 330, the control unit 180 switches the first state to the second state and sets the second state to the current state. The control unit 180 also transmits the current state to the host 210. Meanwhile, the second transmission channel 192 and the fifth transmission channel 195 are disconnected, so that the second communication interface 120 can only transmit data at the speed of USB2.0, thereby ensuring the bandwidth of the target movie 320 when playing. The host 210 sends the target movie 320 of the high-volume movie to the video output interface 130. If the external power 330 is not input by the power input unit 160, the control unit 180 performs the initial power-up process of step S430. The control unit 180 is configured to play the target image 320 according to the new current state (the second state).
Similarly, if the current state is the second state, the control unit 180 will switch the second state to the first state when the user triggers the switching unit 140. The control unit 180 defines the first state as a new current state. The control unit 180 determines whether or not the external power 330 is input. If no external power 330 is input, the control unit 180 performs the initial power-up process of step S430. Otherwise, the control unit 180 changes the connection between the second transmission channel and the fifth transmission channel 195, and the control unit 180 also sends the new current status to the host 210.
The USB hub 100 with resolution switching and the processing method thereof are applied to high-speed data and high-resolution film transmission, and a user can select the corresponding transmission speed and the resolution of film playing through the switching unit 140. By means of the USB hub 100, the transmission speed and the film resolution can be changed without re-plugging the USB hub 100, and a user can intuitively check the operation state of the USB hub 100.
The device corresponds to the description of the method flow, and the shortfalls refer to the description of the method flow and are not repeated. While the foregoing description illustrates and describes the preferred embodiments of the present application, it is to be understood that this application is not limited to the forms disclosed herein, but is not to be construed as an exclusive use of other embodiments, and is capable of many other combinations, modifications and environments, and adaptations within the scope of the inventive concept described herein, through the foregoing teachings or through the skill or knowledge of the relevant arts. And that modifications and variations which do not depart from the spirit and scope of the present invention are intended to be within the scope of the appended claims.
Claims (10)
1. A USB hub with resolution switching, wherein high speed data transmission and high resolution film transmission are switched, the USB hub with resolution switching comprising:
the first communication interface is connected with a host end and transmits a target film and a data signal, and is provided with a first transmission channel, a second transmission channel and a third transmission channel;
the second communication interface is connected with a peripheral device and is used for transmitting data signals, and the second communication interface is provided with a fourth transmission channel and a fifth transmission channel;
a video output interface for outputting the target film to a display, the video output interface having a sixth transmission channel and a seventh transmission channel;
a switching unit for generating a switching command;
the power input unit is electrically connected with the first communication interface and the second communication interface and is used for receiving external power;
the storage unit is used for recording a current state, and the current state is a first state or a second state;
the control unit is electrically connected with the first communication interface, the second communication interface, the video output interface, the switching unit, the power input unit and the storage unit, and the control unit determines the connection of the first transmission channel to the fourth transmission channel or the connection of the first transmission channel to the sixth transmission channel when receiving the switching command;
when the control unit receives the switching command, the control unit judges whether external power is input or not; if the external power is not available, the control unit switches to a first state and records the first state as a current state; and if the external power exists, the control unit is switched from the first state to the second state, or the control unit is switched from the second state to the first state, and the control unit updates the current state.
2. The USB hub with resolution switching as claimed in claim 1, wherein said first, second, fourth, sixth and seventh transmission channels are comprised of tx±and rx±differential signal lines, and said third and fifth transmission channels are comprised of d+ and D-signal lines of USB 2.0.
3. The USB hub with resolution switching as claimed in claim 1, wherein the first communication interface and the second communication interface are third generation USB, and the video output interface is a high-definition multimedia interface (High Definition Multimedia Interface, HDMI), displayPort or USB C-connector.
4. The USB hub with resolution switching of claim 1, wherein in said first state said host outputs a high-flow movie and USB version 3 protocol and in said second state said host outputs a medium-flow movie and USB version 2.0 protocol.
5. The USB hub with resolution switching of claim 4, wherein said display is connected to said video output interface, said control unit checking whether said display has an extended display capability identification information (Extended display identification data, EDID).
6. The USB hub with resolution switching as claimed in claim 5, wherein said control unit sets said first state to an operational state if said extended display capability identification information is not present, and loads said operational state if said extended display capability identification information is present.
7. The USB hub with resolution switching as claimed in claim 1, wherein said external power is from said host side or a transformer to which said power input unit is connected.
8. A processing method for resolution switching is characterized in that high-speed data transmission and high-resolution film transmission are switched, and the processing method for resolution switching comprises the following steps:
connecting a USB hub to a host end and a display for transmitting a target film of the host end to the display;
initializing the USB hub;
the USB hub loads a current state;
the USB hub plays the target film according to the current state;
after receiving a switching command, confirming whether the USB hub has an external power supply or not;
if the current state is a first state and external power is supplied, the USB hub sets the current state to a second state;
if the current state is the second state and external power is supplied, the USB hub sets the current state as the first state; and
if the external power supply is not available, the USB hub is initialized.
9. The method of claim 8, wherein initializing the USB hub comprises:
judging an extended display capability identification information of the display by the USB hub;
if the extended display capability identification information does not exist, the USB hub sets the first state as a current state;
the USB hub outputs the target film to the display according to the current state; and if the extended display capability identification information exists, the USB hub outputs the target film to the display according to the current state.
10. The method of resolution switch processing as claimed in claim 8, wherein after initializing said USB hub, comprising: and the USB hub plays the target film according to the current state.
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