First-in-first-served multi-input interface expansion dock circuit and expansion dock

Abstract

The present application relates to the technical field of docking stations, and discloses a first-plug-first-use multi-input interface docking station circuit and docking station. By setting a multi-input module, the docking station has a multi-input function. When the multi-input module is dual-input, the first external device can be a mobile phone and a computer, and the docking station can be connected to the computer and the mobile phone at the same time. The second external device is also multiple, which can be a U disk, a game hard disk, etc. When the computer and the mobile phone are inserted into the dual-input module, the PD module identifies the insertion order of the first-plug-first-use. If the computer is inserted first, the switch module switches the computer to read the data of the U disk and the game hard disk. If the mobile phone is inserted first, the switch module switches the mobile phone to read the data of the U disk and the game hard disk, and supports data transmission between the computer or mobile phone and the U disk and the game hard disk. With this multi-input mode, when data needs to be read, there is no need to plug and unplug the device, which provides convenience for users to read data.

Description

Technical Field

[0001] The present application relates to the technical field of expansion docks, and in particular to a first-in-first-out multi-input interface expansion dock circuit and an expansion dock. Background Art

[0002] With the development of science and technology, smart phones, tablet computers and other products have become indispensable items in people's lives. In the process of using computers and tablet computers, interfaces are often needed. The interfaces are used to connect the mouse, keyboard, USB flash drive, etc. to the computer host for collaborative work, and the office demand for smart phones is also increasing. Since the screen area of ​​smart phones is very small, in office scenarios, when people need to read text, edit tables, or perform browser searches, the small screen of the mobile phone cannot meet the viewing needs. Therefore, the need to present the content on the mobile phone through an external device or to control the smart phone with an external device arises. The expansion dock in the prior art is a device with extended mobile phone functions. Specifically, through the interface on the expansion dock shell, the smart phone can be connected to more external devices, such as a computer host, a display, a keyboard, a USB flash drive, a mouse, a printer, etc. When in use, the user plugs the mobile phone into the expansion dock and connects it to the external screen through the HDMI interface of the expansion dock. In this way, the mobile phone screen can be projected onto the external screen, and the content on the mobile phone can also be read.

[0003] Most of the expansion docks in the prior art have single input, that is, they can only read device data from one interface. When data from other devices needs to be read, the device needs to be unplugged and then plugged into other devices, which causes inconvenience to users during use. Summary of the invention

[0004] The present application provides a first-in-first-out multi-input interface expansion dock circuit, aiming to solve the above-mentioned technical problems.

[0005] The present application provides a first-in-first-out multi-input interface expansion dock circuit, comprising:

[0006] A multi-input module, used for connecting to a plurality of first external devices;

[0007] A switch module connected to the multi-input module;

[0008] A hub, one end of which is connected to the switch module, and the other end of which is connected to a plurality of female sockets, wherein the plurality of female sockets are used to connect to a second external device;

[0009] A switch module, used for switching data connections between a plurality of first external devices and a second external device;

[0010] It also includes a PD module, one end of which is connected to the switch module; when the multi-input module is inserted into multiple first external devices, the PD module is used to identify the insertion order of the multiple first external devices, and control the switch module to select the first inserted first external device to connect with the second external device to realize data transmission.

[0011] Preferably, the multi-input module includes a first input interface and a second input interface, and the switch module includes a first analog switch, a second analog switch, a switching unit and a control unit;

[0012] The first end of the first analog switch is connected to the first input interface, the second end is connected to the second input interface, the third end is connected to the first end of the control unit, the fourth end is connected to the first end of the switching unit, and the fifth end is connected to the fifth end of the second analog switch;

[0013] A first end of the second analog switch is connected to the first input interface, a second end is connected to the second input interface, a third end is connected to the second end of the control unit, a fourth end is connected to the second end of the switching unit, and a sixth end is connected to the first end of the hub;

[0014] The control unit is used to control the disconnection or connection of the first analog switch and the second analog switch with the switching unit, and the third end of the switching unit is connected to the hub.

[0015] Preferably, the PD module comprises a PD control chip and a third input interface, wherein a first end of the PD control chip is connected to the control unit for identifying an insertion sequence signal of a first external device connected to the first analog switch or the second analog switch; a second end of the PD control chip is connected to the switching unit for controlling the switching unit to select the first external device inserted first to perform data transmission with the second external device according to the insertion sequence signal;

[0016] Preferably, the 32nd pin of the PD control chip is connected to the 19th pin of the control unit, and the 33rd pin of the PD control chip is connected to the 3rd pin of the switching unit.

[0017] Preferably, the third end of the PD control chip is connected to a third input interface, and the third input interface is used for an external power supply to provide charging power for the first external device.

[0018] Preferably, pin 32 of the PD control chip is connected to pin 19 of the control unit, pin 33 of the PD control chip is connected to the third pin of the switching switch unit, pin 27 of the PD control chip is connected to pin A5 of the third input interface, and pin 28 of the PD control chip is connected to pin B5 of the third input interface.

[0019] Preferably, the 33rd pin, the 34th pin, the 36th pin and the 37th pin of the hub are respectively connected to the 25th pin, the 26th pin, the 27th pin and the 28th pin of the switching unit, and are used to open the data transmission channel between the first external device inserted first and the second external device;

[0020] The female socket includes a first female socket and a second female socket, and the 65th pin, the 66th pin, the 68th pin, and the 69th pin of the hub correspond to the 8th pin, the 9th pin, the 5th pin, and the 6th pin of the first female socket, respectively, and are used to transmit the data of the first external device inserted first to the second external device through the first female socket and / or transmit the data of the second external device to the first external device inserted first;

[0021] Pin 58, pin 59, pin 55 and pin 56 of the hub respectively correspond to pin 5, pin 6, pin 8 and pin 9 connected to the first female socket, and are used to transmit data of the first external device inserted first to the second external device through the second female socket and / or transmit data of the second external device to the first external device inserted first.

[0022] Preferably, it further comprises a power supply module, which supplies power to the multi-input module, the switching unit, the hub and the PD module.

[0023] Preferably, the 21st, 22nd, 23rd and 24th pins of the first analog switch are respectively connected to the B2, B3, B10 and B11 pins of the first input interface; the 29th, 30th, 31st and 32nd pins of the first analog switch U5 are respectively connected to the B2, B3, B10 and B11 pins of the second input interface;

[0024] The 25th pin of the second analog switch is connected to the pin of the first input interface, the 26th pin is connected to the pin of the first input interface, the 28th pin is connected to the pin of the first input interface, and the 27th pin is connected to the pin of the first input interface;

[0025] The seventeenth pin of the second analog switch is connected to the pin of the second input interface, the eighteenth pin is connected to the pin of the second input interface, the twentieth pin is connected to the A5 pin of the second input interface, and the nineteenth pin is connected to the B5 pin of the second input interface;

[0026] The fifth pin of the control unit is connected to the sixth pin of the first analog switch, the first pin is connected to the fifth pin of the first analog switch, the fifth pin of the control unit is connected to the sixth pin of the second analog switch, the first pin is connected to the fifth pin of the first analog switch, and the fifth pin of the second analog switch is connected to the tenth pin of the first analog switch;

[0027] The first pin of the first analog switch is connected to the first pin of the switching unit, the second pin is connected to the second pin of the switching unit, the third pin is connected to the sixth pin of the switching unit, and the fourth pin is connected to the seventh pin of the switching unit;

[0028] The first pin of the second analog switch is connected to the ninth pin of the switching switch unit, the second pin is connected to the tenth pin of the switching switch unit, the third pin is connected to the fourth pin of the switching switch unit, and the fourth pin is connected to the fifth pin of the switching switch unit.

[0029] The present application also provides a first-in-first-served multi-input interface expansion dock, wherein the multi-input interface expansion dock comprises any of the above-mentioned first-in-first-served multi-input interface expansion dock circuits.

[0030] The beneficial effects of the present application are as follows: by setting a multi-input module, the expansion dock has a multi-input function. When the multi-input module is dual-input, the first external device can be a mobile phone and a computer, and the expansion dock can be connected to the computer and the mobile phone at the same time. There are also multiple second external devices, which can be U disks, game hard disks, etc. When the computer and the mobile phone are inserted into the dual-input module, the PD module identifies the insertion order of them, and the first plug is used first. If the computer is inserted first, the switch module is used to switch the computer to read the U disk and the game hard disk to read the computer data. If the mobile phone is inserted first, the switch module is used to switch the mobile phone to read the U disk and the game hard disk data, and support data transmission between the computer or mobile phone and the U disk and the game hard disk. With this multi-input mode, when data needs to be read, there is no need to plug and unplug the device, which provides convenience for users to read data. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the overall circuit structure of an embodiment of the present application.

[0032] Figure 2 This is a detailed schematic diagram of the overall circuit structure of an embodiment of the present application.

[0033] Figure 3 FIG. 4 is a circuit diagram of a first input interface according to an embodiment of the present application.

[0034] Figure 4 FIG. 4 is a circuit diagram of a second input interface according to an embodiment of the present application.

[0035] Figure 5 FIG. 1 is a circuit diagram of a first analog switch U5 according to an embodiment of the present application.

[0036] Figure 6 FIG. 1 is a circuit diagram of a second analog switch U6 according to an embodiment of the present application.

[0037] Figure 7 FIG. 1 is a circuit diagram of a control unit according to an embodiment of the present application.

[0038] Figure 8 FIG. 1 is a circuit diagram of a switching unit according to an embodiment of the present application.

[0039] Fig. 9 FIG. 1 is a circuit diagram of a hub according to an embodiment of the present application.

[0040] Fig.10 Schematic diagram of a circuit of the first female socket DOWN1 according to an embodiment of the present application.

[0041] Fig.11 Schematic diagram of a circuit of the second female socket DOWN2 according to an embodiment of the present application.

[0042] Fig.12 FIG. 1 is a circuit diagram of a PD control chip U2 according to an embodiment of the present application.

[0043] Fig.13 FIG. 1 is a circuit diagram of the third input interface U14 according to an embodiment of the present application.

[0044] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

[0045] Description of main component symbols:

[0046] 1. Multi-input module; 2. Switch module; 3. PD module; CN1, first input interface; CN2, second input interface;

[0047] U5, first analog switch; U6, second analog switch; U8, control unit; U9, switching switch unit; U10, hub; DOWN1, first female socket; DOWN2, second female socket; U2, PD control chip; U14, third input interface. DETAILED DESCRIPTION

[0048] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0049] like Figure 1-Figure 13 As shown, the present application provides a first-plug-first-use multi-input interface expansion dock circuit, including:

[0050] A multi-input module 1, used for connecting to a plurality of first external devices;

[0051] A switch module 2, connected to the multi-input module 1, for switching a plurality of first external devices;

[0052] A hub U10, one end of which is connected to the switch module 2, and the other end of which is connected to a plurality of female sockets, and the plurality of female sockets are used to connect to a second external device;

[0053] It also includes a PD module 3, one end of which is connected to the multi-input module 1 and is used for an external power supply to provide charging power for multiple first external devices, and the other end is connected to the hub U10. When the multi-input module 1 is inserted into multiple first external devices, it is used to identify the insertion order of the multiple first external devices and select the first inserted first external device to transmit data with the second external device through the switch module 2.

[0054] As described above, by setting the multi-input module 1, the docking station has a multi-input function. When the multi-input module 1 is dual-input, the first external device can be a mobile phone and a computer, and the docking station can be connected to the computer and the mobile phone at the same time. The second external device is also multiple, which can be a U disk, a game hard disk, etc. When the computer and the mobile phone are inserted into the dual-input module, the PD module 3 identifies the insertion order of them, and the first plug is used first. If the computer is inserted first, the computer is switched to read the data of the U disk and the game hard disk through the switch module 2. If the mobile phone is inserted first, the mobile phone is switched to read the data of the U disk and the game hard disk through the switch module 2, and the data transmission between the computer or mobile phone and the U disk and the game hard disk is supported. The switch module 2 includes an electronic switch and a manual switch. When switching is required, the computer or mobile phone can be directly switched, thereby changing the transmission relationship between the U disk, the game hard disk and the computer or mobile phone, that is, if the mobile phone is inserted first, the U disk and the game hard disk are switched to read the data of the mobile phone through the switch module 2. After that, it can be switched to the computer through the switch module 2, and the U disk and the game hard disk are switched to read the data of the computer. With this multi-input mode, there is no need to plug and unplug the device when data needs to be read, which provides convenience for users to read data.

[0055] In one embodiment, the multi-input module 1 includes a first input interface CN1 and a second input interface CN2, the switch module 2 includes a first analog switch U5, a second analog switch U6, a switching switch unit U9 and a control unit u8, one end of the first analog switch U5 is connected to the first input interface CN1, and the other end is connected to the second input interface CN2, one end of the second analog switch U6 is connected to the first input interface CN1, and the other end is connected to the second input interface CN2, the control unit U8 is connected to one end of the first analog switch U5, the other end of the first analog switch U5 is connected to the second analog switch U6, the other ends of the first analog switch U5 and the second analog switch U6 are both connected to the switching switch unit U9, the control unit U8 is used to control the disconnection or connection of the first analog switch U5 and the second analog switch U6 with the switching switch unit U9, and the switching switch unit U9 is connected to the hub U10. More preferably, the multi-input module 1 may also include a third input interface U14 and a fourth input interface, so as to provide data transmission between more devices. Preferably, the first analog switch U5 and the second analog switch U6 work together to complete the identification of the forward and reverse insertion of the two USB-C ports of the switching unit U9 and the data switching. The switching unit U9 completes the selection and switching of the data end, and the control unit u8 plays the role of commanding, controlling and coordinating the work of the first analog switch U5 and the second analog switch U6. The third end of the switching unit U9 is connected to the hub to realize the communication, read and write transmission functions between the first external device and the second external device at both ends of the switching unit U9.

[0056] In one embodiment, the PD module 3 includes a PD control chip U2 and a third input interface U14. One end of the PD control chip U2 is connected to the control unit U8 and the switch module 2, and is used to identify the insertion order of the first external device connected to the first input interface CN1 and the second input interface CN2. The other end is connected to the third input interface U14, and the third input interface U14 is used for an external power supply to provide charging power for the first external device. The model of the PD control chip U2 is GSV1201S. GSV1201S is a high-performance, low-power USB Type-C Alternate Mode DisplayPort (USB and Type-C Alternative Mode) 1.2 to HDMI 1.4 converter. Its main function is to convert DisplayPort signals into HDMI signals, support the transmission of high-definition video and audio, and also identify the order of the first external devices connected. Which input interface is connected to the first external device first, the input interface connected to the first external device first is the upstream port. For example, if the first external device is a computer, PD 3.1 charging is provided for the computer.

[0057] Specifically, pin 32 of the PD control chip U2 is connected to pin 19 (reset) of the control unit U8, and the transmission signal is reset. Pin 33 of the PD control chip U2 is connected to the third pin of the switching switch unit U9, and the transmission signal is mux-sex. Pin 27 of the PD control chip U2 is connected to pin A5 of the third input interface U14, and the transmission signal is DFPCC1. Pin 28 of the PD control chip U2 is connected to pin B5 of the third input interface U14, and the transmission signal is DFPCC2.

[0058] In one embodiment, the hub U10 has a 33rd pin signal SSTXN_U_A, a 34th pin signal SSTXP_U_A, a 36th pin signal SSRXN_U_A, and a 37th pin signal SSRXP_U_A, which are respectively connected to the 25th pin, the 26th pin, the 27th pin, and the 28th pin of the switching unit U9, and are used to open a data transmission channel between the first external device inserted first and the second external device.

[0059] In one embodiment, the female socket includes a first female socket DOWN1 and a second female socket DOWN2, and the 65th pin signal of the hub U10 is TXN_DS4, the 66th pin signal is TXP_DS4, the 68th pin signal is RXN_DS4, and the 69th pin signal is RXP_DS4, which respectively correspond to the 8th pin signal TXN_DS4, the 9th pin signal TXP_DS4, the 5th pin signal RXN_DS4, and the 6th pin signal RXP_DS4 of the first female socket DOWN1, and are used to transmit the data of the first external device inserted first to the second external device through the first female socket DOWN1 and / or transmit the data of the second external device to the first external device inserted first.

[0060] In one embodiment, the 58th pin signal of the hub U10 is RXN_DS3, the 59th pin signal is RXP_DS3, the 55th pin signal is TXN_DS3, and the 56th pin signal is TXP_DS3, which respectively correspond to the 5th pin signal RXN_DS3, the 6th pin signal RXP_DS3, the 8th pin signal TXN_DS3, and the 9th pin signal TXP_DS3 of the first female socket DOWN1, which are used to transmit the data of the first external device inserted first to the second external device through the second female socket DOWN2 and / or transmit the data of the second external device to the first external device inserted first.

[0061] In one embodiment, it also includes a power supply module U1, which supplies power to the multi-input module 1, the switching unit U9, the hub U10, and the PD module 3. The power supply module converts the voltage into 5V, 3.3V, and 1.08V to power each module.

[0062] In one embodiment, the 21st pin signal of the first analog switch U5 is TX2+_A, the 22nd pin signal is TX2-_A, the 23rd pin signal is RX1-_A, and the 24th pin signal is RX1+_A, which are respectively connected to the B2 pin, B3 pin, B10 pin, and B11 pin of the first input interface CN1; the 29th pin signal of the first analog switch U5 is TX2+_B, the 30th pin signal is TX2-_B, the 31st pin signal is RX1-_B, and the 32nd pin signal is RX1+_B, which are respectively connected to the B2 pin, B3 pin, B10 pin, and B11 pin of the second input interface CN2;

[0063] The 25th pin signal of the second analog switch U6 is DMA connected to the A7 pin of the first input interface CN1, the 26th pin signal is DPA connected to the A6 pin of the first input interface CN1, the 28th pin signal is CC1-A connected to the A5 pin of the first input interface CN1, and the 27th pin signal is CC2-A connected to the B5 pin of the first input interface CN1;

[0064] The signal of the pin 17 of the second analog switch U6 is DMB, which is connected to the A7 pin of the second input interface CN2; the signal of the pin 18 is DPB, which is connected to the A6 pin of the second input interface CN2; the signal of the pin 20 is CC1-B, which is connected to the A5 pin of the second input interface CN2; the signal of the pin 19 is CC2-B, which is connected to the B5 pin of the second input interface CN2;

[0065] The fifth pin signal EN_MCU of the control unit U8 is connected to the sixth pin EN_M of the first analog switch U5, and the first pin SEL_MCU is connected to the fifth pin SEL_C of the first analog switch U5;

[0066] The fifth pin signal of the control unit U8 is EN_MCU, which is connected to the sixth pin signal of the second analog switch U6 as EN_M; the first pin signal is SEL_MCU, which is connected to the fifth pin signal of the first analog switch U5 as SEL_C; the fifth pin signal of the second analog switch U6 is SEL_C_T, which is connected to the tenth pin of the first analog switch U5;

[0067] The first pin signal of the first analog switch U5 is CRX1P_A connected to the first pin of the switching unit U9, the second pin signal is CRX1N_A connected to the second pin of the switching unit U9, the third pin signal is CTX2P_A connected to the sixth pin of the switching unit U9, and the fourth pin signal is CTX2N_A connected to the seventh pin of the switching unit U9;

[0068] The first pin signal of the second analog switch U6 is RX2+_U connected to the ninth pin of the switching switch unit U9, the second pin signal is RX2-_U connected to the tenth pin of the switching switch unit U9, the third pin signal is TX1+_U connected to the fourth pin of the switching switch unit U9, and the fourth pin signal is TX1-_U connected to the fifth pin of the switching switch unit U9.

[0069] In one embodiment, the female socket is a USB-A port, and the multi-input module 1 is also used to convert the interface standard USB 3.2 into the interface standard USB 3.0 through the USB-A port.

[0070] In one embodiment, the transmission rate of the USB-A port is 10 Gbp or 5G Gbp.

[0071] The present application also provides a first-in-first-served multi-input interface expansion dock, wherein the multi-input interface expansion dock comprises any of the above-mentioned first-in-first-served multi-input interface expansion dock circuits.

[0072] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, device, article or method including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, device, article or method. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the presence of other identical elements in the process, device, article or method including the element.

[0073] The above description is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A first-in-first-out multi-input interface expansion dock circuit, characterized in that: include: A multi-input module, used for connecting to a plurality of first external devices; A switch module connected to the multi-input module; A hub, one end of which is connected to the switch module, and the other end of which is connected to a plurality of female sockets, wherein the plurality of female sockets are used to connect to a second external device; A switch module, used for switching data connections between a plurality of first external devices and a second external device; It also includes a PD module, one end of which is connected to the switch module; When the multi-input module is plugged into a plurality of first external devices, the PD module is used to identify the insertion order of the plurality of first external devices, and control the switch module to select the first external device plugged in first to be connected to the second external device, so as to realize data transmission; The multi-input module includes a first input interface and a second input interface, and the switch module includes a first analog switch, a second analog switch, a switching unit and a control unit; The first end of the first analog switch is connected to the first input interface, the second end is connected to the second input interface, the third end is connected to the first end of the control unit, the fourth end is connected to the first end of the switching unit, and the fifth end is connected to the fifth end of the second analog switch; A first end of the second analog switch is connected to the first input interface, a second end is connected to the second input interface, a third end is connected to the second end of the control unit, a fourth end is connected to the second end of the switching unit, and a sixth end is connected to the first end of the hub; The control unit is used to control the disconnection or connection of the first analog switch and the second analog switch with the switching unit, and the third end of the switching unit is connected to the hub; The PD module includes a PD control chip and a third input interface, wherein a first end of the PD control chip is connected to the control unit for identifying an insertion sequence signal of a first external device connected to the first analog switch or the second analog switch; a second end of the PD control chip is connected to the switching unit for controlling the switching unit to select the first external device inserted first to perform data transmission with the second external device according to the insertion sequence signal; The 32nd pin of the PD control chip is connected to the 19th pin of the control unit, and the 33rd pin of the PD control chip is connected to the 3rd pin of the switching unit; The third end of the PD control chip is connected to a third input interface, and the third input interface is used for an external power supply to provide charging power for the first external device; The 27th pin of the PD control chip is connected to the A5th pin of the third input interface, and the 28th pin of the PD control chip is connected to the B5th pin of the third input interface.

2. The first-plug-first-use multi-input interface docking station circuit according to claim 1, characterized in that: Pin 33, pin 34, pin 36 and pin 37 of the hub are respectively connected to pin 25, pin 26, pin 27 and pin 28 of the switch unit, and are used to open a data transmission channel between the first external device inserted first and the second external device; The female socket includes a first female socket and a second female socket, and the 65th pin, the 66th pin, the 68th pin, and the 69th pin of the hub correspond to the 8th pin, the 9th pin, the 5th pin, and the 6th pin of the first female socket, respectively, and are used to transmit the data of the first external device inserted first to the second external device through the first female socket and / or transmit the data of the second external device to the first external device inserted first; Pin 58, pin 59, pin 55 and pin 56 of the hub respectively correspond to pin 5, pin 6, pin 8 and pin 9 connected to the first female socket, and are used to transmit data of the first external device inserted first to the second external device through the second female socket and / or transmit data of the second external device to the first external device inserted first.

3. The first-plug-first-use multi-input interface docking station circuit according to claim 1, characterized in that: It also includes a power supply module, which supplies power to the multi-input module, the switching unit, the hub, and the PD module.

4. The first-plug-first-use multi-input interface docking station circuit according to claim 1, characterized in that: The 21st, 22nd, 23rd and 24th pins of the first analog switch are respectively connected to the B2, B3, B10 and B11 pins of the first input interface; the 29th, 30th, 31st and 32nd pins of the first analog switch are respectively connected to the B2, B3, B10 and B11 pins of the second input interface; The 25th pin of the second analog switch is connected to the pin of the first input interface, the 26th pin is connected to the pin of the first input interface, the 28th pin is connected to the pin of the first input interface, and the 27th pin is connected to the pin of the first input interface; The seventeenth pin of the second analog switch is connected to the pin of the second input interface, the eighteenth pin is connected to the pin of the second input interface, the twentieth pin is connected to the A5 pin of the second input interface, and the nineteenth pin is connected to the B5 pin of the second input interface; The fifth pin of the control unit is connected to the sixth pin of the first analog switch, the first pin is connected to the fifth pin of the first analog switch, the fifth pin of the control unit is connected to the sixth pin of the second analog switch, the first pin is connected to the fifth pin of the first analog switch, and the fifth pin of the second analog switch is connected to the tenth pin of the first analog switch; The first pin of the first analog switch is connected to the first pin of the switching unit, the second pin is connected to the second pin of the switching unit, the third pin is connected to the sixth pin of the switching unit, and the fourth pin is connected to the seventh pin of the switching unit; The first pin of the second analog switch is connected to the ninth pin of the switching switch unit, the second pin is connected to the tenth pin of the switching switch unit, the third pin is connected to the fourth pin of the switching switch unit, and the fourth pin is connected to the fifth pin of the switching switch unit.

5. A first-in-first-out multi-input interface expansion dock, characterized in that: The multi-input interface expansion dock comprises the first-plug-first-served multi-input interface expansion dock circuit according to any one of claims 1 to 4.

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