TWM639691U - Interface conversion device - Google Patents

Abstract

The invention provides an interface conversion device comprising a USB connector, a DP connector, a first physical layer (PHY) circuit, a second PHY circuit, a digital buffer, a USB controller and a path switching circuit. The first terminal of the first PHY circuit is coupled to the USB connector. The digital buffer and the USB controller are coupled to the second terminal of the first PHY circuit. The first terminal of the second PHY circuit is coupled to the DP connector. The path switching circuit selectively electrically connects the second terminal of the second PHY circuit to the output terminal of the digital buffer when the interface conversion device operates in a DP ALT Mode. The path switching circuit selectively electrically connects the second terminal of the second PHY circuit to the DP output terminal of the USB controller when the interface conversion device operates in a tunneling mode.

Description

interface conversion device

The present invention relates to an electronic device, and in particular relates to an interface conversion device.

The interface conversion device can convert the first transmission interface of one device to the second transmission interface of another device. For example, a USB transmission interface (USB connector) of a Universal Serial Bus (USB) host can be electrically connected to a DP transmission interface (DP connector) of a DisplayPort (DP) device through an interface conversion device. Therefore, the interface conversion device can transmit data from the USB Type-C connector (USB-C connector) of the USB host to the DP connector of the DP device. How to implement the interface conversion device is one of many technical issues in this technical field.

The novel creation provides an interface conversion device for transmitting data between different transmission interfaces.

In an embodiment of the new creation, the above-mentioned interface conversion device includes a first universal serial bus (Universal Serial Bus, USB) connector, a display A port (DisplayPort, DP) connector, a first physical layer (physical layer) circuit, a second physical layer circuit, a digital buffer (digital buffer), a USB controller, and a path switching circuit. The first terminal of the first physical layer circuit is coupled to the first USB connector. The first end of the second physical layer circuit is coupled to the DP connector. The input end of the digital buffer is coupled to the second end of the first physical layer circuit. The USB controller is coupled to the second terminal of the first physical layer circuit. The common terminal of the path switching circuit is coupled to the second terminal of the second physical layer circuit. The first selection terminal of the path switching circuit is coupled to the output terminal of the digital buffer. The second selection terminal of the path switching circuit is coupled to the DP output terminal of the USB controller. When the operation mode of the interface conversion device is DP Alternative Mode (DP ALT Mode), the path switching circuit selectively electrically connects the common terminal to the first selection terminal. When the operation mode of the interface converting device is the tunneling mode, the path switching circuit selectively electrically connects the common terminal to the second selection terminal.

In an embodiment of the new creation, the above-mentioned interface conversion device includes a USB connector, a DP connector, a digital buffer, a USB controller, a path switching circuit, an analog-to-digital conversion circuit, and a digital-to-analog conversion circuit. The analog-to-digital conversion circuit is coupled to the USB connector, the digital buffer and the USB controller. The analog-to-digital conversion circuit converts the first analog data signal of the USB connector into the first digital data, and outputs the first digital data to the digital buffer and the USB controller. The first selection terminal of the path switching circuit is coupled to the output terminal of the digital buffer. The second selection terminal of the path switching circuit is coupled to the DP output terminal of the USB controller. When the operation mode of the interface conversion device is the DP replacement mode, the path switching circuit selectively electrically connects the common end of the path switching circuit to the first selection end. When the interface switches the operating mode of the device In the tunneling mode, the path switching circuit selectively electrically connects the common end to the second selection end. The digital-to-analog conversion circuit is coupled to the path switching circuit and the DP connector. The digital-to-analog conversion circuit converts the second digital data at the common end of the path switching circuit into a second analog data signal, and outputs the second analog data signal to the DP connector.

Based on the above, the interface conversion device described in various embodiments of the present invention can convert the analog domain signal of the USB connector into a digital domain signal to the digital buffer and the USB controller. Based on different operation modes of the interface conversion device, the interface conversion device can choose to convert the digital domain signal of the digital buffer or the USB controller into an analog domain signal for the DP connector. Therefore, the interface switching device can transmit data between different transmission interfaces.

In order to make the above-mentioned features and advantages of the new creation more obvious and easy to understand, the following specific examples are given together with the attached drawings for detailed description as follows.

100, 300, 400: interface conversion device

110, 310, 410, 415: USB connector

120, 320, 420: DP connector

130, 330, 430: PD controller

140, 180, 440, 480, 490: physical layer circuit

150, 350, 450: digital buffer

160, 360, 460: USB controller

161, 461: USB4 router

162, 462: DP output adapter

170, 370, 470: path switching circuit

340:Analog to digital conversion circuit

380: Digital-analog conversion circuit

463:USB3 Adapter

510, 610: receiving (RX) circuit

520, 620: transmission (TX) circuit

SW51, SW52, SW61, SW62: switch

FIG. 1 is a schematic diagram of a circuit block of an interface converting device according to an embodiment of the present invention.

FIG. 2 is a schematic circuit block diagram of a USB controller according to an embodiment of the present invention.

FIG. 3 is a schematic circuit block diagram of an interface converting device according to another embodiment of the present invention.

FIG. 4 is a schematic circuit block diagram of an interface conversion device according to another embodiment of the present invention.

5 and 6 are schematic circuit block diagrams of a physical layer circuit according to an embodiment of the present invention.

FIG. 7 is a schematic circuit block diagram of a USB controller according to an embodiment of the present invention.

FIG. 8 is a schematic circuit block diagram of a USB controller according to another embodiment of the present invention.

The term "coupled (or connected)" used throughout the specification (including claims) of this application may refer to any direct or indirect means of connection. For example, if it is described that a first device is coupled (or connected) to a second device, it should be interpreted that the first device can be directly connected to the second device, or the first device can be connected to the second device through other devices or certain A connection means indirectly connected to the second device. The terms "first" and "second" mentioned in the entire description of this case (including the scope of the patent application) are used to name elements (elements), or to distinguish different embodiments or ranges, and are not used to limit the number of elements The upper or lower limit of , nor is it used to limit the order of the elements. In addition, wherever possible, elements/components/steps using the same reference numerals in the drawings and embodiments represent the same or similar parts. Elements/components/steps using the same symbols or using the same terms in different embodiments can refer to related descriptions.

Fig. 1 is an interface conversion device according to an embodiment of the present invention 100 is a schematic diagram of a circuit block. The interface conversion device 100 shown in FIG. 1 includes a universal serial bus (Universal Serial Bus, USB) connector 110, a display port (DisplayPort, DP) connector 120, a power transmission (Power Delivery, PD) controller 130, a physical layer ( physical layer) circuit 140 , digital buffer (digital buffer) 150 , USB controller 160 , path switching circuit 170 and physical layer circuit 180 . The USB connector 110 may be a USB Upstream-Facing Port (UFP) specified by the USB specification, and the DP connector 120 may be a Downstream-Facing Port (DFP).

The PD controller 130 is coupled between a Configuration Channel (CC) pin of the USB connector 110 and the path switching circuit 170 . The CC pins may include CC1 pins and (or) CC2 pins specified in the USB specification. The PD controller 130 can exchange configuration information with a USB host (not shown) through the CC pin of the USB connector 110 , and then determine the operation mode of the interface conversion device 100 according to the configuration information. Based on practical applications, the host may include a computer, a tablet computer, a mobile phone or other electronic devices with a USB-C connector. The PD controller 130 may control the path switching operation of the path switching circuit 170 according to the operation mode.

The first end of the physical layer circuit 140 is coupled to the data transmission pin of the USB connector 110 . For example, when the USB connector 110 is a USB Type-C connector (also known as a USB-C connector), the physical layer circuit 140 can be coupled to the four sides of the USB-C connector regulated by the USB specification. A high-speed lane (lane): sending (transmitting, TX) pin to TX1, receiving (receiving, RX) pin to RX1, The sending pin is paired with TX2 and the receiving pin is paired with RX2. The physical layer circuit 140 can convert the analog domain signal of the USB connector 110 into a digital domain signal to the digital buffer 150 and the USB controller 160 . Based on practical applications, the PHY circuit 140 may include a USB PHY circuit regulated by the USB specification or other circuits. For example, in some implementation examples, the physical layer circuit 140 may include a TX circuit and an RX circuit regulated by the USB specification. In some other implementation examples, the physical layer circuit 140 may include an analog-to-digital conversion circuit and/or a digital-to-analog conversion circuit. The analog-to-digital conversion circuit (not shown) can convert the analog data signal of the USB connector 110 into digital data, and output the digital data to the digital buffer 150 and the USB controller 160 . The digital-to-analog conversion circuit (not shown) can convert the digital data of the digital buffer 150 or the USB controller 160 into an analog data signal, and output the analog data signal to the USB connector 110 .

The input terminal of the digital buffer 150 is coupled to the second terminal of the physical layer circuit 140 . Based on actual design, the digital buffer 150 may include a first-in-first-out (First-In and First-Out, FIFO) buffer or other digital buffer circuits. When the operation mode of the interface conversion device 100 is DP alternative mode (DP ALT Mode, hereinafter referred to as DP ALT mode), the digital buffer 150 can compensate the clock jitter between the USB connector 110 and the DP connector 120 .

The USB controller 160 is coupled to the second end of the physical layer circuit 140 . Based on actual design, the USB controller 160 may include a USB controller regulated by the USB specification and/or other USB signal processing circuits. For example, the USB controller 160 may include a link layer (link layer), a transport layer and (transport layer) and/or protocol layer (protocol layer). When the operation mode of the interface conversion device 100 is the tunneling mode (Tunneling Mode), the USB controller 160 can process the digital data of the second end of the physical layer circuit 140 to generate native DP data (native DP data) to the physical layer circuit 180 . Based on practical applications, the tunneling mode may include a display port tunneling (DP Tunneling) mode or other tunneling modes.

The first end of the physical layer circuit 180 is coupled to the data transmission pin of the DP connector 120 . For example, the physical layer circuit 180 may be coupled to four main link lanes of a DP connector specified by the DP specification. The second end of the physical layer circuit 180 is coupled to the common end of the path switching circuit 170 . The physical layer circuit 180 can convert the digital domain signal at the common end of the path switching circuit 170 into an analog domain signal to the DP connector 120 . Based on practical applications, the PHY circuit 180 may include a USB PHY circuit regulated by the USB specification, a PHY circuit regulated by the DP specification, or other circuits. For example, in some implementation examples, the physical layer circuit 180 may include a digital-to-analog conversion circuit. The digital-to-analog conversion circuit (not shown) can convert the digital data at the common end of the path switching circuit 170 into an analog data signal, and output the analog data signal to the DP connector 120 .

The first selection terminal of the path switching circuit 170 is coupled to the output terminal of the digital buffer 150 . The second selection terminal of the path switching circuit 170 is coupled to the DP output terminal of the USB controller 160 . When the operation mode of the interface conversion device 100 is the DP ALT mode, the path switching circuit 170 selectively electrically connects the common terminal to the first selection terminal, so as to transmit the original DP data output by the digital buffer 150 to the physical layer circuit 180. When the operation mode of the interface conversion device 100 is the tunneling mode, the path switching circuit 170 selectively electrically connects the common terminal to the second selection terminal, so as to transmit the native DP data output by the USB controller 160 to the physical layer circuit 180.

The specific implementation of the physical layer circuit 140 and the physical layer circuit 180 can be determined according to the actual design. For example, in some embodiments, the circuit structure of the physical layer circuit 140 is the same as that of the physical layer circuit 180 . The physical layer circuit 140 and the physical layer circuit 180 may be common (or analog) physical layer circuits, so that the interfaces of the USB connector 110 and the DP connector 120 are almost symmetrical.

To sum up, the interface conversion device 100 in the above embodiment can convert the analog domain signal of the USB connector 110 into a digital domain signal (native DP data) to the digital buffer 150 and the USB controller 160 . Based on different operation modes of the interface conversion device 100, the interface conversion device 100 can choose to convert the native DP data output by the digital buffer 150 into a DP analog domain signal to the DP connector 120, or can choose to convert the native DP data of the USB controller 160 The data is converted into a DP analog domain signal and sent to the DP connector 120 . Therefore, the interface conversion device 100 can transmit data between different transmission interfaces.

FIG. 2 is a schematic circuit block diagram of a USB controller 160 according to an embodiment of the present invention. The USB controller 160 shown in FIG. 2 can be used as one of many implementation examples of the USB controller 160 shown in FIG. 1 . In the embodiment shown in FIG. 2 , the USB controller 160 includes a USB4 router 161 and a DP output adapter 162 . The USB4 router 161 is coupled to the second end of the physical layer circuit 140 . The USB4 router 161 can perform tunneling packets parsing, Segmentation, routing...etc. Based on actual design, the USB4 router 161 may include a USB controller specified by the USB4 specification and/or other USB signal processing circuits. For example, the USB4 router 161 may include a link layer and/or a transport layer specified by the USB4 specification.

The DP output adapter 162 is coupled to the USB4 router 161 . The DP output adapter 162 can convert tunneling packets into native DP packets. Based on actual design, the DP output adapter 162 may include a DP adapter regulated by the USB4 specification and/or other DP adapter circuits. The output terminal of the DP output adapter 162 is used as the DP output terminal of the USB controller 160 to be coupled to the second selection terminal of the path switching circuit 170 .

FIG. 3 is a schematic circuit block diagram of an interface conversion device 300 according to another embodiment of the present invention. The interface conversion device 300 shown in FIG. 3 includes a USB connector 310, a DP connector 320, a PD controller 330, an analog-to-digital conversion circuit 340, a digital buffer 350, a USB controller 360, a path switching circuit 370, and a digital-to-analog conversion circuit 380. . Interface conversion device 300, USB connector 310, DP connector 320, PD controller 330, digital buffer 350, USB controller 360 and path switching circuit 370 shown in FIG. Relevant descriptions of the connector 110 , the DP connector 120 , the PD controller 130 , the digital buffer 150 , the USB controller 160 and the path switching circuit 170 are omitted here. Based on the actual design, in some embodiments, the USB controller 360 shown in FIG. 3 may refer to the relevant description of the USB controller 160 shown in FIG. 2 .

In the embodiment shown in Figure 3, the analog-to-digital conversion circuit 340 is coupled to the USB connector 310 , data buffer 350 and USB controller 360 . The analog-to-digital conversion circuit 340 can convert the first analog data signal of the USB connector 310 into a first digital data, and output the first digital data to the digital buffer 350 and the USB controller 360 . The digital-to-analog conversion circuit 380 is coupled to the path switching circuit 370 and the DP connector 320 . The digital-to-analog conversion circuit 380 can convert the second digital data at the common end of the path switching circuit 370 into a second analog data signal, and output the second analog data signal to the DP connector 320 . When the operation mode of the interface conversion device 300 is the DP ALT mode, the path switching circuit 370 can selectively electrically connect the common end of the path switching circuit 370 to the first selection end, so as to convert the original DP output from the digital buffer 350 The data is transmitted to the digital-to-analog conversion circuit 380 . When the operation mode of the interface conversion device 300 is the tunneling mode, the path switching circuit 370 can selectively electrically connect the common terminal to the second selection terminal, so as to transmit the native DP data output by the USB controller 360 to the digital analog conversion circuit 380 .

FIG. 4 is a schematic circuit block diagram of an interface conversion device 400 according to another embodiment of the present invention. The interface conversion device 400 shown in FIG. layer circuit 480 and physical layer circuit 490 . Interface conversion device 400, USB connector 410, DP connector 420, PD controller 430, physical layer circuit 440, digital buffer 450, USB controller 460, path switching circuit 470 and physical layer circuit 480 shown in FIG. The interface conversion device 100 shown in FIG. 1 , the USB connector 110 , the DP connector 120 , the PD controller 130 , the physical layer circuit 140 , Relevant descriptions of the digital buffer 150 , the USB controller 160 , the path switching circuit 170 , and the physical layer circuit 180 are omitted here. In the embodiment shown in FIG. 4 , the data transmission between the physical layer circuit 440 and the USB controller 460 may be bidirectional transmission.

In the embodiment shown in FIG. 4 , the USB connector 410 may be a USB upstream port (UFP) specified by the USB specification, and the USB connector 415 may be a USB downstream port (DFP) specified by the USB specification. A first end of the physical layer circuit 490 is coupled to the USB connector 415 . The second end of the physical layer circuit 490 is coupled to the USB downstream end of the USB controller 460 . Based on practical applications, the PHY circuit 490 may include a USB PHY circuit regulated by the USB specification or other circuits. For example, in some implementation examples, the physical layer circuit 490 may include a TX circuit and an RX circuit regulated by the USB specification. In some other implementation examples, the physical layer circuit 490 may include an analog-to-digital conversion circuit and/or a digital-to-analog conversion circuit. The specific implementation of the physical layer circuit 440 , the physical layer circuit 480 and the physical layer circuit 490 can be determined according to the actual design. For example, in some embodiments, the circuit structures of the physical layer circuit 440 , the physical layer circuit 480 and the physical layer circuit 490 are the same. The physical layer circuits 440 , 480 and 490 may be general (or analog) physical layer circuits such that the interfaces of the USB connector 110 and the USB connector 415 are almost symmetrical.

The PD controller 430 can exchange configuration information with the USB host (not shown) through the CC pin of the USB connector 410 , and then determine the operation mode of the interface conversion device 400 according to the configuration information. In some embodiments, the operation modes (path switching) of the physical layer circuit 440, the physical layer circuit 480, and the physical layer circuit 490 may be based on According to the control of PD controller 430 . In other embodiments, the physical layer circuit 440, the physical layer circuit 480, and the physical layer circuit 490 may receive configuration information from the CC pin of the USB connector 410, and then determine the operations of the physical layer circuits 440, 480, and 490 according to the configuration information. model.

FIG. 5 is a schematic circuit block diagram of a physical layer circuit 440 according to an embodiment of the present invention. The physical layer circuit 440 shown in FIG. 5 includes a switch SW51 , a receiver (RX) circuit 510 , a transmitter (TX) circuit 520 and a switch SW52 . A common terminal of the switch SW51 is coupled to the USB connector 410 . The first selection terminal of the switch SW51 is coupled to the input terminal of the RX circuit 510 . The second selection terminal of the switch SW51 is coupled to the output terminal of the TX circuit 520 . The first selection terminal of the switch SW52 is coupled to the output terminal of the RX circuit 510 . The second selection terminal of the switch SW52 is coupled to the input terminal of the TX circuit 520 . A common terminal of the switch SW52 is coupled to the digital buffer 450 and the USB controller 460 . In some embodiments, the operation mode (path switching) of the switch SW51 and the switch SW52 can be controlled by the PD controller 430 . In other embodiments, the switch SW51 and the switch SW52 can receive configuration information from the CC pin of the USB connector 410 , and then determine the operation mode of the switches SW51 and SW52 according to the configuration information. Based on the CC pin configuration information, the switch SW51 can couple the USB connector 410 to the input of the RX circuit 510 , and the switch SW52 can couple the output of the RX circuit 510 to the digital buffer 450 and the USB controller 460 .

FIG. 6 is a schematic circuit block diagram of a physical layer circuit 480 (or physical layer circuit 490 ) according to an embodiment of the present invention. Entities shown in Figure 6 The layer circuit 480 (or 490 ) includes a switch SW61 , a reception (RX) circuit 610 , a transmission (TX) circuit 620 , and a switch SW62 . A common terminal of the switch SW61 is coupled to the path switching circuit 470 (or the USB controller 460). The first selection terminal of the switch SW61 is coupled to the output terminal of the RX circuit 610 . The second selection terminal of the switch SW61 is coupled to the input terminal of the TX circuit 620 . The first selection terminal of the switch SW62 is coupled to the input terminal of the RX circuit 610 . The second selection terminal of the switch SW62 is coupled to the output terminal of the TX circuit 620 . A common end of the switch SW62 is coupled to the DP connector 420 (or the USB connector 415 ). In some embodiments, the operation mode (path switching) of the switch SW61 and the switch SW62 can be controlled by the PD controller 430 . In other embodiments, the switch SW61 and the switch SW62 can receive configuration information from the CC pin of the USB connector 410 , and then determine the operation mode of the switches SW61 and SW62 according to the configuration information. Based on the configuration information of the CC pin, the switch SW61 can couple the path switching circuit 470 (or the USB controller 460) to the input terminal of the TX circuit 620, and the switch SW62 can couple the output terminal of the TX circuit 620 to the DP connector 420 (or USB connector 415).

FIG. 7 is a schematic circuit block diagram of a USB controller 460 according to an embodiment of the present invention. The USB controller 460 shown in FIG. 7 can be used as one of many implementation examples of the USB controller 460 shown in FIG. 4 . In the embodiment shown in FIG. 7 , the USB controller 460 includes a USB4 router 461 , a DP output adapter 462 and a USB3 adapter 463 . For the USB4 router 461 and the DP output adapter 462 shown in FIG. 7 , reference may be made to the relevant descriptions of the USB4 router 161 and the DP output adapter 162 shown in FIG. 2 , so details will not be repeated here. USB3 adapter 463 shown in Figure 7 The first end of is coupled to the USB4 router 461 . The USB3 adapter 463 can convert the USB tunneling packets into native USB packets. The second end of the USB3 adapter 463 is used as the USB downstream end of the USB controller 460 to be coupled to the second end of the physical layer circuit 490 . Based on actual design, the USB3 adapter 463 may include a USB3 adapter regulated by the USB4 specification and/or other USB adapter circuits.

When the operation mode of the interface conversion device 400 is the tunneling mode, the path switching circuit 470 can selectively electrically connect the common terminal to the second selection terminal, so as to transmit the original DP data output by the DP output adapter 462 to the physical layer Circuit 480. In addition, in another embodiment, the USB3 adapter 463 can output native USB3 data to the physical layer circuit 490 in the tunneling mode. When the operation mode of the interface conversion device 400 is DP ALT mode and the pin assignment (pin assignment) mode is "Pin assignment C or E", the path switching circuit 470 can selectively transfer the four high-speed pins output by the digital buffer 450 The native DP data of the lane is transmitted to the physical layer circuit 480 . When the operation mode of the interface conversion device 400 is the DP ALT mode and the pin assignment mode is "Pin assignment D", the path switching circuit 470 can selectively transfer the original DP data output by the digital buffer 450 (the USB connector 410 The DP data of two high-speed lanes) are transmitted to the physical layer circuit 480 , and the USB3 adapter 463 can output native USB3 data (the USB data of the other two high-speed lanes of the USB connector 410 ) to the physical layer circuit 490 .

FIG. 8 is a schematic circuit block diagram of a USB controller 460 according to another embodiment of the present invention. The USB controller 460 shown in Figure 8 can be used as It is one of many implementation examples of the USB controller 460 shown in FIG. 4 . In the embodiment shown in FIG. 8 , the USB controller 460 includes a USB4 router 461 , a DP output adapter 462 and a USB3 adapter 463 . For the USB4 router 461 , DP output adapter 462 and USB3 adapter 463 shown in FIG. 8 , reference may be made to the relevant descriptions of the USB4 router 461 , DP output adapter 462 and USB3 adapter 463 shown in FIG. 7 , so details are not repeated here. In the embodiment shown in FIG. 8, when the operation mode of the interface conversion device 400 is DP ALT mode and the pin assignment mode is "Pin assignment D", the data of a pair of USB high-speed lanes (lanes) of the physical layer circuit 440 can be Bypass the USB4 router 461 and go directly to the USB3 adapter 463 .

Although the present invention has been disclosed above with the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and changes without departing from the spirit and scope of the present invention. Retouching, so the scope of protection of this new type of creation should be defined by the scope of the attached patent application.

100:Interface conversion device

110: USB connector

120:DP connector

130: PD controller

140, 180: physical layer circuit

150: digital buffer

160: USB controller

170: Path switching circuit

Claims (18)

An interface conversion device, comprising: a first USB connector; a DP connector; a first physical layer circuit having a first end coupled to the first USB connector; a second physical layer circuit having a first end coupled to the DP connector; a digital buffer having an input end coupled to a second end of the first physical layer circuit; a USB controller coupled to the second end of the first physical layer circuit; and A path switching circuit having a common terminal coupled to a second terminal of the second physical layer circuit, wherein a first selection terminal of the path switching circuit is coupled to an output terminal of the digital buffer, the path switching A second selection terminal of the circuit is coupled to a DP output terminal of the USB controller, Wherein, when an operation mode of the interface conversion device is a DP replacement mode, the path switching circuit selectively electrically connects the common terminal to the first selection terminal, Wherein, when the operation mode of the interface converting device is a tunneling mode, the path switching circuit selectively electrically connects the common terminal to the second selection terminal. The interface conversion device as claimed in claim 1, wherein the first USB connector is an uplink port, and the DP connector is a downlink port. The interface conversion device as claimed in claim 1, wherein the digital buffer comprises a first-in-first-out buffer. The interface switching device as claimed in claim 1, wherein the circuit structure of the first physical layer circuit is the same as that of the second physical layer circuit. The interface conversion device as described in claim 1, wherein the first physical layer circuit includes an analog-to-digital conversion circuit for converting the analog data signal of the first USB connector into a digital data, and the digital data output to the digital buffer and the USB controller. The interface conversion device as described in claim 1, wherein the second physical layer circuit includes a digital-to-analog conversion circuit for converting a digital data at the common end of the path switching circuit into an analog data signal, and the analog Data signals are output to the DP connector. The interface conversion device as described in claim 1, further comprising: A power transmission controller, coupled between a configuration channel pin of the first USB connector and the path switching circuit, wherein the power transmission controller exchanges a configuration information with a USB host through the configuration channel pin The operation mode of the interface conversion device is determined, and the power transmission controller controls the path switching operation of the path switching circuit according to the operation mode. The interface conversion device as described in claim 1, wherein the USB controller includes: a USB4 router, coupled to the second end of the first physical layer circuit; and A DP output adapter is coupled to the USB4 router, wherein an output end of the DP output adapter is used as the DP output end of the USB controller to be coupled to the second selection end of the path switching circuit. The interface conversion device as described in claim 1, further comprising: a second USB connector; and A third physical layer circuit has a first end coupled to the second USB connector, wherein a second end of the third physical layer circuit is coupled to a USB downstream end of the USB controller. The interface conversion device as claimed in claim 9, wherein the first USB connector is an uplink port, and the second USB connector is a downlink port. The interface conversion device as claimed in claim 9, wherein the circuit structures of the first physical layer circuit, the second physical layer circuit and the third physical layer circuit are the same. The interface conversion device as described in claim 9, wherein the USB controller includes: a USB4 router, coupled to the second end of the first physical layer circuit; a DP output adapter, coupled to the USB4 router, wherein an output end of the DP output adapter is used as the DP output end of the USB controller to be coupled to the second selection end of the path switching circuit; and A USB3 adapter having a first end coupled to the USB4 router, wherein a second end of the USB3 adapter serves as the USB downstream end of the USB controller to be coupled to the second end of the third physical layer circuit end. An interface conversion device, comprising: a USB connector; a digital buffer; a USB controller; an analog-to-digital conversion circuit coupled to the USB connector, the digital buffer and the USB controller, wherein the analog-to-digital conversion circuit converts a first analog data signal of the USB connector into a first digital data, and the analog-to-digital conversion circuit outputs the first digital data to the digital buffer and the USB controller; a DP connector; A path switching circuit, wherein a first selection end of the path switching circuit is coupled to an output end of the digital buffer, and a second selection end of the path switching circuit is coupled to a DP output end of the USB controller , when an operation mode of the interface conversion device is a DP replacement mode, the path switching circuit selectively electrically connects a common end of the path switching circuit to the first selection end, and when the interface conversion device When the operation mode is a tunneling mode, the path switching circuit selectively electrically connects the common terminal to the second selection terminal; and a digital-to-analog conversion circuit coupled to the path switching circuit and the DP connector, wherein the digital-to-analog conversion circuit converts a second digital data at the common end of the path switching circuit into a second analog data signal, and the The digital-to-analog conversion circuit outputs the second analog data signal to the DP connector. The interface conversion device as claimed in claim 13, wherein the USB connector is an uplink port, and the DP connector is a downlink port. The interface conversion device as claimed in claim 13, wherein the digital buffer comprises a first-in-first-out buffer. The interface conversion device as described in claim 13, further comprising: A power transfer controller, coupled between a configuration channel pin of the USB connector and the path switching circuit, wherein the power transfer controller exchanges a configuration information with a USB host through the configuration channel pin to determine the The operation mode of the interface conversion device, and the power transmission controller controls the path switching operation of the path switching circuit according to the operation mode. The interface conversion device as described in claim 13, wherein the USB controller includes: a USB4 router, coupled to an output end of the analog-to-digital conversion circuit to receive the first digital data; and A DP output adapter coupled to the USB4 router, wherein an output end of the DP output adapter is used as the DP output end of the USB controller to be coupled to the second selection end of the path switching circuit. The interface conversion device as described in claim 13, wherein the USB controller includes: a USB4 router, coupled to the analog-to-digital conversion circuit; and A DP output adapter coupled to the USB4 router, wherein an output end of the DP output adapter is used as the DP output end of the USB controller to be coupled to the second selection end of the path switching circuit.

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