CN111858420A - Resource switching system of USB hub - Google Patents

Abstract

The application discloses a resource switching system of a USB concentrator, which comprises a source end, USB equipment and the concentrator. The source end is provided with a first transmission channel, a second transmission channel and a third transmission channel; the concentrator is provided with a switching circuit, a switch, a first device interface, a second device interface and a control wafer, wherein the switching circuit is coupled to the first device interface, the second device interface and the control wafer, a first transmission channel is connected to the first device interface, a third transmission channel is connected to the second device interface, the switching circuit selects a path of the second transmission channel, the first device interface and the second device interface are electrically connected to a GPIO pin of the control wafer, and the control wafer identifies the communication type of the USB device through the GPIO pin and determines that the second transmission channel is connected to the first device interface or the second device interface.

Description

Resource switching system of USB hub

technical field

A switching system for peripheral hardware resources, particularly a resource switching system for USB hubs.

Background technique

With the improvement of computer computing power, the transmission capability of peripheral devices also needs to be strengthened. Therefore, the Universal Serial Bus (USB for short) is strengthened from 1.5 Mbps of the first-generation protocol to 5 Gbps of the third-generation protocol. USB devices have also expanded from storage devices and peripheral devices to image output and other functions.

Due to the image output mechanism of the third-generation USB protocol, a single docking station (dock) can provide a USB interface and an image interface, such as DisplayPort, High Definition Multimedia Interface (HDMI) or video graphics array. (Video Graphics Array, referred to as VGA). A high-bandwidth channel is required to transmit high-resolution images on the display port, so the conventional docking station provides a mechanism for channel switching between image data and data data. In Taiwan's Invention Patent No. I6515719 (Automatic Switching Device and Automatic Switching Method), it is stated that the transmitted image resolution traffic is used as the number and switching of transmission channels. In the case of I6515719, the number of USB transmission channels of the docking station will be increased or decreased when the resolution is changed, so as to satisfy the transmission of image data and also conform to the transmission of data data. For example, in the case of high-resolution transmission, the docking station switches from the third-generation USB communication protocol to the second-generation USB communication protocol, and provides the vacated transmission channel for image data transmission.

However, such a switching mechanism has two disadvantages. The first disadvantage is that the identification of the resolution is determined by the host. Because the docking station itself does not have an identification mechanism for data traffic. Therefore, it can only be judged by the host side, and in order to achieve this goal, there needs to be a corresponding agent program on the host side. After the agent program determines the video traffic, the agent program drives the processing of switching the transmission channel of the docking station. The second point is that the switching of the image resolution will cause data transmission errors. Especially in the process of data data transmission, if the docking station switches the number of transmission channels at this time, it will cause data data writing errors. This is because the reduction from four transmission channels to two transmission channels will result in the loss of data in transmission, resulting in write errors. Moreover, when the image resolution is frequently switched, the writing of the data will also be affected.

SUMMARY OF THE INVENTION

The technical problem to be solved by this application is: when the USB hub is connected to different USB devices, it can provide corresponding transmission channels and speeds.

In order to solve the above problems, the present application provides a resource switching system of a USB hub, which is characterized in that the data transmission channel of the source end is switched and used for accelerated transmission of data. The resource switching system of the USB hub of the present application includes a source terminal, a USB device and a hub. The source end has a second communication interface, and the second communication interface has a first transmission channel, a second transmission channel and a third transmission channel; the hub is electrically connected to the source end and the USB device, and the hub has a switching circuit, a switching switch, a first communication channel The interface, the first device interface, the second device interface and the control chip, the switching circuit is coupled to the first communication interface, the first device interface, the second device interface and the control chip, the switch is connected to the control chip, and the first communication interface is connected In the second communication interface, the switching circuit is used to select the path of the second transmission channel, the first transmission channel is connected to the first device interface, the third transmission channel is connected to the second device interface, and the first device interface is electrically connected to the second device interface. It is connected to the GPIO pin of the control chip, the second device interface is connected to the USB device, the control chip identifies the communication type of the USB device through the GPIO pin, and determines that the second transmission channel is connected to the first device interface or the second device interface. .

The present application further proposes a USB hub, which is characterized in that the number of transmission channels is determined according to the connected USB devices. The USB hub of the present invention includes a first communication interface, a switch, a first device interface, a second device interface, a switching circuit and a control chip. The first communication interface is connected to the source end, and the first communication interface has a first transmission channel, a second transmission channel and a third transmission channel; a switch command is generated when the switch is triggered; the first device interface is electrically connected to the first communication interface and the third transmission channel. the first transmission channel; the second device interface is electrically connected to the first communication interface and the third transmission channel, the second device interface has a plurality of data pins, the second device interface is used to connect the USB device; the switching circuit is connected to the first communication interface, the switching circuit is used to select the connection path of the second transmission channel; the control chip includes GPIO pins, the control chip is electrically connected to the switching circuit, and the control chip switches the second transmission channel according to the type of the USB device to connect to the first device interface or The second device interface, or the control chip, connects the second transmission channel to the first device interface according to the switching command.

The present application further proposes a resource switching method of a USB hub, which includes the following steps: connecting a USB device to a first device interface of the hub; triggering a GPIO pin of the hub by the USB device to identify the type of the USB device; If the USB device is USB1.0 or USB2.0, the hub connects the second transmission channel to the first device interface; if the USB device is USB3.0, the hub connects the second transmission channel to the second device interface; Set the second device interface and control the transmission clock of the chip.

Compared with the prior art, the present application can obtain the following technical effects:

1) The resource switching system and method of the USB hub provided by the present application can ensure the transmission quality of the USB device and the playback quality of the display device, and the switching process does not affect the transmission of data.

2) The resource switching system of the USB hub of the present application can avoid misjudgments when switching images and data.

Of course, any product implementing the present application does not necessarily need to achieve all of the above-mentioned technical effects at the same time.

Description of drawings

The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The schematic embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation of the present application.

FIG. 1 is a schematic diagram of the system architecture of the present application.

FIG. 2 is a schematic diagram of the connection of the transmission channel of the present application.

FIG. 3 is a schematic diagram of an operation flow of the present application.

FIG. 4 is a schematic state diagram of the USB device connection and transmission channel of the present application.

FIG. 5 is a schematic diagram of another state of the USB device connection and transmission channel of the present application.

FIG. 6 is a schematic diagram of an operation flow of the present application.

FIG. 7 is a schematic diagram of the state of the transmission channel when the switch of the present application is triggered.

Detailed ways

The embodiments of the present application will be described in detail below with reference to the accompanying drawings and examples, so as to fully understand and implement the implementation process of how to apply technical means to solve technical problems and achieve technical effects in the present application.

The present application proposes a resource switching system 100 of a USB hub, which includes a hub 110 , a source terminal 120 and a USB device 130 (Universal Serial Bus, USB for short), which is shown in FIG. 1 . The hub 110 includes a control chip 111 , a switch circuit 112 , a switch 113 , a first communication interface 114 , a first device interface 115 and a second device interface 116 . In Figure 1, thick black lines are used as electrical connections, and arrows represent signal transmission paths.

The control chip 111 is coupled to the source end 120 , the switching circuit 112 , the switching switch 113 , the first device interface 115 and the second device interface 116 . The control chip 111 has a general-purpose input/output (GPIO for short) pin 117 , and the GPIO pin 117 is connected to the second device interface 116 . The control chip 111 is used to detect the type of the USB device 130 and drive the connection path of the switching circuit 112 . The switch 113 is used to switch and connect the second transmission channel 121b to the second device interface 116 . The type of the switch 113 can be, but is not limited to, a push switch, a DIP switch, or a rotary switch or other element that can send a trigger signal.

The source end 120 can be, but not limited to, a personal computer, a notebook computer, or a computer device with image output and data access, such as a mobile phone or a tablet. The source end 120 has a second communication interface 121, and the second communication interface 121 has a first transmission channel 121a, a second transmission channel 121b and a third transmission channel 121c. The source end 120 transmits image data or data data through the first transmission channel 121a, the second transmission channel 121b and the third transmission channel 121c.

The first communication interface 114 , the second communication interface 121 and the second device interface 116 are USB interfaces, the protocol type of the first communication interface 114 and the second communication interface 121 is USB 3.0 series, and the protocol of the second device interface 116 The type is USB1.0, 2.0 or 3.0 series. The first device interface 115 is a Display Port or a High Definition Multimedia Interface (HDMI for short). The first device interface 115 is used to connect to the display device 140 and output image data to the display device 140 . The first device interface 115 can transmit high-definition video (High Definition or Full High Definition Video) or ultra-high-definition video (Ultra HDVideo).

The first transmission channel 121a is composed of two sets of differential signal lines of TX1± and RX1± (four signal lines in total), and the second transmission channel 121b is composed of two sets of differential signal lines of TX2± and RX2± . The third transmission channel 121c is composed of D+ and D- of USB2.0. In other words, the first transmission channel 121a has two sets of channels that can transmit image data. Similarly, the second transmission channel 121b also has two sets of channels for transmitting image data or data data, as shown in FIG. 2 . The third transmission channel 121c transmits the USB data. In Figure 2, the connecting lines represent electrical connections between components, and the arrows represent the transmission paths of the channels.

The first communication interface 114 is connected to the second communication interface 121 by a cable, so that the first communication interface 114 conducts the first transmission channel 121a, the second transmission channel 121b and the third transmission channel 121c. The switching circuit 112 is respectively connected to the second transmission channel 121b , the first device interface 115 and the second device interface 116 . The switching circuit 112 is used for switching the destination of the second transmission channel 121b, so that the second transmission channel 121b can be selectively connected to the first device interface 115 or the second device interface 116. In this application, the second device interface 116 is electrically connected to the GPIO pin 117 of the control chip 111 . Therefore, the hub 110 can identify the type of the connected USB device 130 through the trigger content of the GPIO pin 117 .

For a clear description of the present application, please refer to FIG. 3 , which is a schematic diagram of the operation flow of the present application. The resource switching method of the USB hub of the present application includes the following steps:

Step S310: Connect the USB device to the first device interface of the hub;

Step S320: triggering the GPIO pin of the hub by the USB device to identify the type of the USB device;

Step S330: if the USB device is USB1.0 or USB2.0, the hub connects the second transmission channel to the first device interface;

Step S340: if the USB device is USB3.0, the hub connects the second transmission channel to the second device interface; and

Step S350: Reset the transmission clock between the second device interface and the control chip.

When the second device interface 116 is connected to the USB device 130 supporting the communication protocol of USB 2.0 (or lower), the GPIO pin 117 can detect the D± signal of the USB device 130 and trigger the control chip 111 . The control chip 111 drives the switching circuit 112 to connect the second transmission channel 121b to the first device interface 115, as shown in FIG. 4 . When the second device interface 116 is connected to the USB device 130 with the communication protocol of USB 3.0 (or above), since the GPIO pin 117 will not receive the D± signal, the control chip 111 drives the switching circuit 112 to transmit the second transmission The channel 121b is connected to the second device interface 116, as shown in FIG.

During the switching process of the second transmission channel 121b, the control chip 111 additionally resets the transmission clock to the USB device 130, thereby re-transmitting the data to the USB device 130 (or the source end 120). Since the change of the number of transmission channels will affect the configuration of the data data at the source end 120, the control chip 111 needs to reset the transmission clock. If the new USB device 130 is connected to the second device interface 116 and the new USB device 130 and the previous USB device 130 belong to the same communication protocol, the control chip 111 will not reset the transmission clock.

For example, it is assumed that the second device interface 116 is connected to the first device 151 of USB 2.0. The second transmission channel 121b is connected to the first device interface 115 . If the user removes the first device 151 and installs the second device 152, and the second device 152 is also USB 2.0 (or 1.0) series. The control wafer 111 does not switch the second transfer channel 121b. If the second device 152 is a communication protocol of USB 3.0 (or above), the control chip 111 connects the second transmission channel 121 b to the second device interface 116 .

In step S330 , the user can trigger the switch 113 of the hub 110 , please also cooperate with FIG. 6 , which is a schematic diagram of the processing flow of triggering the switch 113 of the present application. The steps of triggering the switch 113 include:

Step S331: trigger the switch of the hub; and

Step S332: Drive the hub to switch and connect the second transmission channel to the first device interface.

When the hub 110 is connected to the USB 3.0 USB device 130 , the second transmission channel 121 b is preset to be connected to the second device interface 116 . When the user presses the switch 113 , the control chip 111 switches the second transmission channel 121 b from the second device interface 116 to the first device interface 115 according to the trigger signal, as shown in FIG. 7 . At the same time, the control chip 111 also resets the transmission clock to ensure the synchronization between the source end 120 and the USB device 130 and the integrity of the data. When the display device 140 connected to the first device interface 115 is removed, the control chip 111 drives the switching circuit 112 to connect the second transmission channel 121 b to the first device interface 115 . In addition, if the second device interface 116 is empty, the second transmission channel 121b will be connected to the second device interface 116 by default.

The resource switching system 100 and method of the USB hub 110 of the present application can determine the transmission channel of the data data and the video data according to the connected USB device 130, so as to ensure the quality of video playback. Moreover, the hub 110 of the present application can identify the communication protocol type of the connected USB device 130, and then select the corresponding number of transmission channels. Compared with the prior art, the present application does not need the source end 120 and the driver to identify the usage situation, so the present application can avoid the problem of automatic switching of image resolutions.

The device corresponds to the description of the aforementioned method flow, and for the deficiencies, please refer to the description of the aforementioned method flow, which will not be repeated one by one. The above description shows and describes several preferred embodiments of the present application, but as mentioned above, it should be understood that the present application is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various and other combinations, modifications and environments, and can be modified within the scope of the inventive concepts described herein, from the above teachings or from skill or knowledge in the relevant art. However, modifications and changes made by those skilled in the art do not depart from the spirit and scope of the present application, and should all fall within the protection scope of the appended claims of the present application.

Claims (10)

1. A resource switching system of a USB hub, wherein a data transmission channel of a source terminal is switched and used for accelerated transmission of data, the resource switching system of the USB hub comprising:

a source end having a second communication interface, the second communication interface having a first transmission channel, a second transmission channel and a third transmission channel;

a USB device; and

a hub electrically connected to the source terminal and the USB device, the hub having a switch circuit, a switch, a first communication interface, a first device interface, a second device interface and a control chip, the switch circuit being coupled to the first communication interface, the first device interface, the second device interface and the control chip, the switch being connected to the control chip, the first communication interface being connected to the second communication interface, the switch circuit being used to select the path of the second transmission channel, the first transmission channel being connected to the first device interface, the third transmission channel being connected to the second device interface, the first device interface and the second device interface being electrically connected to a GPIO pin of the control chip, the second device interface being connected to the USB device, the control chip identifying the communication type of the USB device through the GPIO pin, and determining whether the second transmission channel is connected to the first device interface or the second device interface.

2. The system of claim 1, wherein the USB devices are of the USB1.0 family, the USB2.0 family, and the USB3.0 family.

3. The system for switching resources of a USB hub according to claim 1, wherein if the USB device is USB1.0 or USB2.0, the control chip sends a first request to the source end to connect the second transmission channel to the first device interface, and if the USB device is USB3.0 or USB3.1, the control chip sends a second request to the source end to connect the second transmission channel to the second device interface.

4. The system of claim 1, wherein the switch is enabled to enable the control chip to send a first request to the source, and the second transmission channel is connected to the first device interface.

5. A USB hub, wherein the transmission channel of data is switched to speed up the data transmission, the USB hub comprising:

a first communication interface connected to a source end, the first communication interface having a first transmission channel, a second transmission channel and a third transmission channel;

A switch for generating a switching command when the switch is triggered;

a first device interface electrically connected to the first communication interface and the first transmission channel;

a second device interface electrically connected to the first communication interface and the third transmission channel, the second device interface having a plurality of data pins, the second device interface being used for connecting a USB device;

a switching circuit connected to the first communication interface for selecting the connection path of the second transmission channel; and

a control chip including a GPIO pin, the control chip being electrically connected to the switching circuit, the control chip switching the second transmission channel to be connected to the first device interface or the second device interface according to the type of the USB device, or the control chip connecting the second transmission channel to the first device interface according to the switching command.

6. The USB hub according to claim 5, wherein the USB devices are of the type including USB1.0 series, USB2.0 series, and USB3.0 series.

7. The USB hub according to claim 6, wherein if the USB device is USB1.0 or USB2.0, the control chip sends a first request to the source end to connect the second transmission channel to the first device interface, and if the USB device is USB3.0 or USB3.1, the control chip sends a second request to the source end to connect the second transmission channel to the second device interface.

8. A USB hub, wherein the transmission channel of data is switched to speed up the data transmission, the USB hub comprising:

a first communication interface connected to a source end, the first communication interface having a first transmission channel, a second transmission channel and a third transmission channel;

a switch for generating a switching command when the switch is triggered;

a control chip;

the first equipment interface is electrically connected with the first communication interface and the first transmission channel and is connected with a display device;

a second device interface electrically connected to the first communication interface and the third transmission channel, the second device interface having a plurality of data pins, the second device interface being connected to a USB device; and

a switching circuit connected to the first communication interface and the control chip;

when the display device is connected to the first device interface, the display device sends an extended display identification information to the control chip, and the switching circuit selects the second transmission channel to be connected to the first device interface or the second device interface.

9. The USB hub according to claim 8, wherein if the extended display identification information includes an ultra-resolution information (ULSI), the control circuit connects the second transmission channel to the first device interface.

10. The USB hub according to claim 8, wherein the control circuit connects the second transmission channel to the second equipment interface if the extended display identification information includes a full HD-resolution information (HD-full HD-resolution information) or an ultra-clear resource .

Images