TWI801972B - Generic interface card - Google Patents

Abstract

A generic interface card is disclosed. The generic interface conforms to the interface protocol of M.2 and the specification of B+M Type. The generic interface includes a data transmission interface, an USB module, a switch circuit and a detection circuit. The USB module is electrically connected to the data transmission interface, which processes an first signal transmitted by the data transmission interface. The switch circuit is coupled to the USB module and the data transmission interface, which controls the conduction status of the USB module and the data transmission interface. The detection circuit is electrically connected to a detected pin of the data transmission interface and the switch circuit, which detects a second signal transmitted by the detected pin and controls the switch circuit according to the second signal.

Description

Universal interface card

This case relates to an interface card, especially a general-purpose interface card.

M.2 is a transmission interface protocol developed by the PCI-SIG and SATA-IO standard organizations. It was originally called NGFF (Next Generation Form Factor), and it was officially named M.2 in 2013. The feature of M.2 is that it is compatible with a variety of interface signal controllers, including SATA, PCIe, Universal Serial Bus (hereinafter referred to as USB), audio, etc., so it can be used in various functional fields, such as wireless networks (Wi-Fi), Bluetooth, Near Field Communication (NFC) and Solid State Drives (SSD), etc.

The M.2 interface card includes two specifications: B Type and M Type. In addition to the number of interface pins, the position of the key is also different. Therefore, the interface cards of these two specifications They cannot be used with each other, that is to say, the interface card of Type B cannot be inserted into the interface slot of Type M, and vice versa. Because the interface cards of these two specifications are too similar in appearance, consumers often buy opposite products. In order to solve this problem, various manufacturers have introduced a new interface card: B+M Type interface card. One of the features of the B+M Type interface card is that it has both the foolproof key of the B Type interface card and the foolproof key of the M Type interface card, so the B+M Type interface card can not only be inserted into the interface slot of the B Type , and can also be inserted into the interface slot of M Type.

Although the key design of the B+M Type interface card allows it to be inserted into the interface slots of the two specifications, the B+M Type interface card still faces the problem of functional compatibility. Since each pin in the interface slot of the B Type and each pin in the interface slot of the M Type correspond to different functions, the circuit design of the B+M Type interface card needs to take these two into consideration at the same time. Each pin in the interface slot has a function, so as to avoid compatibility problems and cause damage to the interface card.

For example, the M.2 interface protocol defines that the ninth pin (PIN9) in the B Type interface slot is used to transmit USB data signals, so the B Type interface card is usually equipped with a USB module to support The function of USB communication. However, the ninth pin (PIN9) in the interface socket of the M Type is not assigned any function, and is only defined as grounding. Therefore, inserting a B+M Type interface card with a USB module into the M Type interface slot not only fails to use the USB communication function, but also may cause compatibility problems and cause damage to the B+M Type interface card.

In order to make the B+M Type interface card compatible with the B Type interface slot and the M Type interface slot at the same time, the USB module that the B Type interface card only has must be sacrificed in the circuit design to avoid the occurrence of the same problem. Capacitance problems lead to damage to the B+M Type interface card. Therefore, if consumers want to use the USB communication function, they still can only choose the B Type interface card with a USB module.

In view of this, this project proposes a universal interface card that complies with the M.2 interface protocol and the B+M Type specification, including a data transmission interface, a universal serial bus module, a switch circuit and a detection circuit. The universal serial bus module is electrically connected to the data transmission interface for processing the first signal sent by the data transmission interface. The switch circuit is arranged between the UBS module and the data transmission interface to control the operation state of the UBS module. The detection circuit is electrically connected to the detection pin of the data transmission interface and the switch circuit for detecting the second signal sent by the detection pin and controlling the switch circuit according to the second signal.

In some embodiments, the universal serial bus module of the universal interface card is electrically connected to the ninth pin (PIN9) of the data transmission interface.

In some embodiments, the switch circuit of the universal interface card is a power switch IC.

In some embodiments, the switching circuit of the universal interface card is a USB signal switching circuit.

In some embodiments, the detection circuit of the above universal interface card includes a transistor, a first resistor and a second resistor. The transistor has a control terminal, an output terminal and a ground terminal, wherein the control terminal is electrically connected to the detection pin, the output terminal is electrically connected to the switch circuit, and the ground terminal is used for grounding. Both ends of the first resistor are electrically connected to the first voltage source and the control terminal of the transistor respectively, and the first resistor is used for inputting a first voltage value to the control terminal. Both ends of the second resistor are electrically connected to the second voltage source and the output terminal of the transistor respectively, and the second resistor is used for outputting a second voltage value to the output terminal.

In some embodiments, the above-mentioned transistor system is an N-type metal oxide semiconductor field effect transistor (NMOS).

In some embodiments, the operation state of the above-mentioned universal serial bus module is one of an open state and a closed state.

In some embodiments, the detection circuit controls the switch circuit to be in one of an enabled state and a disabled state according to the second signal transmitted by the detection pin.

In some embodiments, when the second signal is a fluctuating signal, the detection circuit controls the switch circuit to the disabled state according to the second signal, so that the switch circuit does not conduct the data The transmission interface and the USB module; when the second signal is a non-fluctuating signal, the detection circuit controls the switch circuit to the enable state according to the second signal, so that the switch circuit is turned on The data transmission interface and the USB module.

In some embodiments, when the switch circuit is in the disabled state, the USB module cannot perform data transmission with the data transmission interface, so that the universal interface card does not support a USB communication function; when the switch When the circuit is in the enabling state, the USB module can perform data transmission with the data transmission interface, so that the universal interface card supports the USB communication function.

To sum up, in some embodiments, the universal interface card retains the USB module that only the B Type interface card has, and controls the operation status of the USB module through the detection circuit, so that the universal interface card is inserted in the B Type When using a Type interface slot or an M Type interface slot, there will be no compatibility issues that will cause damage to the universal interface card.

The following will disclose some embodiments of this case with diagrams. For the sake of clarity, many practical details will be described together in the following description, but this is not intended to limit the scope of the patent application of this case.

Please refer to Fig. 1 to Fig. 3 simultaneously, Fig. 1 is the circuit block diagram according to one embodiment of the general interface card 100 of this case, Fig. 2 is the circuit diagram according to one embodiment of the detection circuit 140 of the general interface card 100 of the case , FIG. 3 is a flow chart of the control switch circuit in one embodiment of the universal interface card 100 according to the present case. In this embodiment, the universal interface card 100 includes a data transmission interface 110, a universal serial bus module 120 (hereinafter referred to as the USB module 120), a switch circuit 130 and a detection circuit 140, wherein the universal interface card 100 conforms to M. 2 interface protocol and B+M Type specifications. As shown in Figure 1, the USB module 120 is electrically connected to the data transmission interface 110 through a plurality of lines, the switch circuit 130 is arranged between the USB module 120 and the data transmission interface 110, and the detection circuit 140 is electrically connected to the data transmission interface. A detection pin 111 of the interface 110 and a switch circuit 130 .

As shown in FIG. 2 , the detection circuit 140 includes a transistor T11 , a first resistor R11 and a second resistor R12 , wherein the transistor T11 has a control terminal, an output terminal and a ground terminal. The control end of the transistor T11 is electrically connected to the detection pin 111 of the data transmission interface 110, the output end of the transistor T11 is electrically connected to the switch circuit 130, the ground end of the transistor T11 is used for grounding, and the first resistor R11 The two ends are electrically connected to the first voltage source 141 and the control end of the transistor T11 respectively, and the two ends of the second resistor R12 are electrically connected to the second voltage source 142 and the output end of the transistor T11 respectively. In some embodiments, the transistor T11 is an N-type metal oxide semiconductor field effect transistor (hereinafter referred to as NMOS). In some embodiments, the threshold voltage of the NMOS is 0.9 volts (V). When the control terminal of the transistor T11 is at a high voltage level, the transistor T11 will be turned on and turned on, wherein the high voltage level needs to be greater than or equal to the critical voltage of the transistor T11 to enable the transistor T11 to be turned on. conduction; when the control terminal of the transistor T11 is at a low voltage level, the transistor T11 will be turned off and not conduction, and the low voltage level must be lower than the critical voltage of the transistor T11 to enable the transistor T11 to be turned on. off and not on. The resistance value of the first resistor R11 and the resistance value of the second resistor R12 can be defined according to the needs of users. In some embodiments, the resistance value of the first resistor R11 is in the range of 1K ohm (Ω) to 10K ohm (Ω), and the resistance value of the second resistor R12 is in the range of 1K ohm (Ω) to 10K ohm (Ω) between the range.

In some embodiments, the transistor T11 can also be a P-type metal oxide semiconductor field effect transistor (hereinafter referred to as PMOS), a bipolar junction transistor (BJT), or any other transistor that can be used as a switch. model of a transistor. Since the characteristics of different types of transistors are different, when the transistor T11 is a non-NMOS transistor, some electronic components need to be added to the control terminal, output terminal or ground terminal of the transistor T11. The output result of the detection circuit 140 can be correct. For example, when the transistor T11 is a PMOS, since the conduction characteristic of the PMOS is just opposite to that of the NMOS, an inverter (Inverter) needs to be added to the control terminal or the output terminal of the transistor T11. The output result of the detection circuit 140 can be correct. Those with ordinary knowledge in the technical field of the present invention are well aware of the characteristics of any type of transistor, so those with ordinary knowledge in the technical field of the present invention can directly understand how to adjust the detection circuit 140 based on the characteristics of any type of transistor. circuit, so I won’t go into details.

The data transmission interface 110 is used for signal transmission with an external electronic device, wherein the external electronic device is at least provided with a B Type interface slot conforming to the M.2 interface protocol or an M Type interface slot. In some embodiments, the data transmission interface 110 is a card edge (Card Edge), wherein the card edge complies with the M.2 interface protocol. In some embodiments, the external electronic device can be a computer motherboard of any type, wherein the interface slot on the external electronic device is a card edge slot (Card Edge slot) for inserting the card edge. Slot). Since the universal interface card 100 conforms to the B+M Type specification, the universal interface card 100 can be inserted into the interface slot of the B Type or the interface slot of the M Type, and communicate with the external electronic device through the data transmission interface 110 transmission. In some embodiments, each pin of the data transmission interface 110 is electrically connected to a corresponding pin of the interface slot, for example, the first pin (PIN1) of the data transmission interface 110 is electrically connected to is electrically connected to the first pin (PIN1) in the interface slot, and the second pin (PIN2) in the data transmission interface 110 is electrically connected to the second pin (PIN2) in the interface slot, and so on.

In some embodiments, the USB module 120 is used to process a first signal transmitted by the external electronic device from the transmission pin 112 of the data transmission interface 110, wherein the transmission pin 112 is the ninth signal in the data transmission interface 110 A pin (PIN9), the first signal is a USB signal. In the M.2 interface protocol, the ninth pin (PIN9) in the B Type interface slot is defined as a USB differential signal pair (USB differential signal, Ex: D+/D-), the USB pin of one of the USB signals (D-), therefore, when the universal interface card 100 is plugged into the interface slot of B Type, the universal interface card 100 can process the transmission through the USB module 120 The first signal sent by the pin 112 supports the function of USB communication. In some embodiments, the USB module 120 may be a USB unit, or may be a USB circuit composed of a USB extender (USB Hub Controller) connected to multiple USB units.

In some embodiments, the switch circuit 130 is used to control the conduction state between the USB module 120 and the data transmission interface 110. If the switch circuit 130 is enabled (Enable), the internal circuit of the switch circuit 130 will show a closed circuit conduction. state, and make the USB module 120 connected to the data transmission interface 110 through the switch circuit 130 electrically connected to the data transmission interface 110 . If the switch circuit 130 is disabled (Disable), the internal circuit of the switch circuit 130 will show a non-conductive state of circuit disconnection, so that the USB module 120 connected to the data transmission interface 110 through the switch circuit 130 cannot be electrically connected to the data. The transmission interface 110 further causes the USB module 120 to be unable to perform data transmission with the data transmission interface 110 .

In some embodiments, the switch circuit 130 is a power switch IC, wherein the switch circuit 130 is electrically connected to the data transmission interface 110 and receives external power through the data transmission interface 110 . The USB module 120 is electrically connected to the switch circuit 130 and receives power required for operation through the switch circuit 130 . If the switch circuit 130 is enabled (Enable), the inside of the switch circuit 130 will be in a closed conduction state. At this time, the USB module 120 can receive the power transmitted through the data transmission interface 110 through the switch circuit 130 and be in the open state/operate. state (power on/active); if the switch circuit 130 is disabled (Disable), the internal circuit of the switch circuit 130 presents a non-conductive state in which the circuit is disconnected. At this time, the USB module 120 cannot receive the required operation through the switch circuit 130 power off/inactive. That is to say, when the USB module 120 of the universal interface card 100 is turned on (power on), the universal interface card 100 supports the function of USB communication; when the USB module 120 of the universal interface card 100 is turned off (power off) In this case, the universal interface card 100 does not support the function of USB communication.

In another embodiment, the switch circuit 130 is a USB signal switch circuit, and is used to control the USB communication function of the USB module 120 on and off, wherein the switch circuit 130 is disposed in the USB module 120 . The USB module 120 is electrically connected to the transmission pin 112 of the data transmission interface 110 and used for transmitting USB signals to external electronic devices connected to the universal interface card 100 . If the switch circuit 130 is enabled (Enable), the switch circuit 130 will be turned on to output an enable signal, so that the USB module 120 is in an open state (switch on) according to the enable signal, and then the USB module 120 is turned on. And execute the function of the USB communication. If the switch circuit 130 is disabled (Disable), the switch circuit 130 will not be turned on and not output the enable signal, or output a disable signal different from the enable signal, so that the USB module 120 according to The disabling signal is switched off because the enabling signal is not received, so that the USB module 120 is not turned on and does not perform the function of the USB communication. That is to say, when the universal interface card 100 enables the function of the USB communication, the universal interface card 100 can transmit data through the USB module 120 and the data transmission interface 110; when the universal interface card 100 does not enable the function of the USB communication At this time, the universal interface card 100 cannot perform data transmission through the USB module 120 and the data transmission interface 110 .

In some embodiments, the detection circuit 140 is used to detect a second signal transmitted by the pin 111, and control the switch circuit 130 according to the second signal, wherein the detection pin 111 is the data transmission interface 110 The eleventh pin (PIN11). In the M.2 interface protocol, the eleventh pin (PIN11) in the interface slot of Type B is defined to transmit a ground signal of a continuous low voltage level, and the pin 11 in the interface slot of Type M Eleven pins (PIN11) are defined to transmit a fluctuating signal of discontinuous high voltage level. Therefore, when the universal interface card 100 is inserted into an interface slot with unclear specifications, the universal interface card 100 can detect the second signal transmitted by the pin 111 through the detection circuit 140 to determine the interface slot. What are the specifications. If the second signal transmitted by the detection pin 111 is a ground signal at a continuous low voltage level, it means that the interface slot is a Type B interface slot. That is to say, the external electronic device inserted into the universal interface card 100 communicates with the universal interface card 100 through the interface protocol of M. (Enable) state; if the second signal transmitted by the detection pin 111 is a fluctuating signal of a discontinuous high voltage level, it means that the interface slot is an M Type interface slot, and at this time the detection The circuit 140 controls the switch circuit 130 to be in a Disable state.

In some embodiments, when the universal interface card 100 is inserted into the interface slot of Type B, the second signal transmitted by the detection pin 111 of the data transmission interface 110 is a non-fluctuating signal (for example, a continuous low voltage level), at this time, the first voltage source 141 and the first resistor R11 of the detection circuit 140 will form a DC circuit with the detection pin 111 and generate a DC current, and make the control terminal of the transistor T11 at a low voltage level. Since the control terminal of the transistor T11 is at a low voltage level, the transistor T11 will be turned off and not conduct, so the second voltage source 142 and the second resistor R12 of the detection circuit 140 will not conduct with the ground terminal of the transistor T11, At this time, the output terminal of the transistor T11 is at a high voltage level under the influence of the second voltage source 142 and not influenced by the ground terminal of the transistor T11 . When the output terminal of the transistor T11 is at a high voltage level, the detection circuit 140 transmits the high voltage level as the enable signal to the switch circuit 130 , so that the switch circuit 130 is in an enabled state. At this time, the switch circuit 130 will be electrically connected to the transmission pin 112 of the USB module 120 and the data transmission interface 110, so that the USB module 120 can communicate with the external electronic device inserted into the universal interface card 100 through the data transmission interface 110. communication, so that the universal interface card 100 supports the function of USB communication.

In another embodiment, when the universal interface card 100 is inserted into the interface slot of Type B, the second signal transmitted by the detection pin 111 of the data transmission interface 110 is a non-fluctuating signal (for example, a continuous low A ground signal of the voltage level), at this time, the first voltage source 141 and the first resistor R11 of the detection circuit 140 will form a DC circuit with the detection pin 111 and generate a DC current, and make the control of the transistor T11 terminal is at a low voltage level. Since the control terminal of the transistor T11 is at a low voltage level, the transistor T11 will be turned off and not conduct, so the second voltage source 142 and the second resistor R12 of the detection circuit 140 will not conduct with the ground terminal of the transistor T11, At this time, the output terminal of the transistor T11 is at a high voltage level under the influence of the second voltage source 142 and not influenced by the ground terminal of the transistor T11 . When the output terminal of the transistor T11 is at a high voltage level, the detection circuit 140 transmits the high voltage level as the enable signal to the switch circuit 130 , so that the switch circuit 130 is in an enabled state. At this time, the switch circuit 130 transmits the power required for the operation of the USB module 120 to the USB module 120 , so that the USB module 120 receives the power required for operation through the switch circuit 130 and is in an operating state. At this time, the universal interface card 100 can perform USB communication with the external electronic device inserted into the universal interface card 100 through the USB module 120 , so that the universal interface card 100 supports the function of USB communication.

In some embodiments, when the universal interface card 100 is inserted into the M-type interface slot, the second signal transmitted by the detection pin 111 of the data transmission interface 110 is a fluctuating signal of a discontinuous high voltage level At this time, the first voltage source 141 and the first resistor R11 of the detection circuit 140 form a DC circuit with the detection pin 111 to generate a DC current, and make the control terminal of the transistor T11 at a high voltage level. Since the control terminal of the transistor T11 is at a high voltage level, the transistor T11 will be turned on and conducted, so the second voltage source 142 and the second resistor R12 of the detection circuit 140 will form a DC circuit with the ground terminal of the transistor T11 And generate a direct current, at this time the output terminal of the transistor T11 will be at a low voltage level due to the influence of the ground terminal of the transistor T11. When the output terminal of the transistor T11 is at a low voltage level, the detection circuit 140 transmits the low voltage level as the enable signal to the switch circuit 130 , so that the switch circuit 130 is in a non-conductive and disabled state. At this time, the switch circuit 130 will not be electrically connected to the transmission pin 112 of the USB module 120 and the data transmission interface 110, so that the USB module 120 cannot communicate with the external electronic device inserted through the data transmission interface 110 and the universal interface card 100. USB communication, so that the universal interface card 100 does not support the function of USB communication.

In another embodiment, when the universal interface card 100 is inserted into the interface slot of the M Type, the second signal transmitted by the detection pin 111 of the data transmission interface 110 is a fluctuation of a discontinuous high voltage level signal, the first voltage source 141 and the first resistor R11 of the detection circuit 140 will form a DC circuit with the detection pin 111 and generate a DC current, and make the control terminal of the transistor T11 be at a high voltage level. Since the control terminal of the transistor T11 is at a high voltage level, the transistor T11 will be turned on and conducted, so the second voltage source 142 and the second resistor R12 of the detection circuit 140 will form a DC circuit with the ground terminal of the transistor T11 And generate a direct current, at this time the output terminal of the transistor T11 will be at a low voltage level due to the influence of the ground terminal of the transistor T11. When the output terminal of the transistor T11 is at a low voltage level, the detection circuit 140 transmits the low voltage level as the enable signal to the switch circuit 130 , so that the switch circuit 130 is in a non-conductive and disabled state. At this time, the switch circuit 130 cannot transmit the power required for the operation of the USB module 120 to the USB module 120 , so that the USB module 120 cannot receive the power required for operation through the switch circuit 130 and is in an idle state. At this time, the universal interface card 100 cannot perform USB communication with the external electronic device inserted into the universal interface card 100 through the USB module 120 , so that the universal interface card 100 does not support the function of USB communication.

As shown in Figure 3, when the universal interface card 100 is inserted in an interface slot of an external electronic device, the data transmission interface 110 of the universal interface card 100 will be electrically connected to the interface slot of the external electronic device (step S10 ), at this moment, the universal interface card 100 cannot determine which specification the interface slot is. Next, the detection circuit 140 of the universal interface card 100 detects a second signal transmitted by the detection pin 111 of the data transmission interface 110 (step S20), and determines whether the second signal is a non-fluctuating signal ( Step S30). If so, the interface slot is a Type B interface slot (step S40), and the detection circuit 140 of the universal interface card 100 will control the switch circuit 130 to be in an enabled state (step S50), so that the USB module 120 is in the Open state, now the universal interface card 100 supports the function of USB communication; if not, then the interface slot is the interface slot of M Type (step S60), the detection circuit 140 of the universal interface card 100 can control the switch circuit 130 is a disabled state (step S70 ), so that the USB module 120 is in a closed state. At this time, the universal interface card 100 does not support the function of USB communication.

To sum up, according to some embodiments of the universal interface card 100 of this case, the universal interface card 100 retains the USB module 120 that only the B Type interface card has, and detects the inserted interface slot through the detection circuit 140 Which specification is used, and the switch state of the USB module 120 is controlled through the switch circuit 130 . When the universal interface card 100 is inserted into the interface slot of the B Type, the USB module 120 will be in the open state. At this time, the universal interface card 100 supports the function of USB communication; when the universal interface card 100 is inserted into the interface slot of the M Type When the slot is open, the USB module 120 will be in a closed state, and the universal interface card 100 does not support the USB communication function at this time. In this way, when the universal interface card 100 is inserted into the interface slot of the M Type, compatibility problems and damage to the universal interface card 100 can be avoided.

Although this case has been disclosed as above with the embodiment, it is not used to limit the creation of this case. Anyone with common knowledge in the technical field may make some modifications and changes without departing from the spirit and scope of this disclosure. However, the slight modifications and changes are still within the scope of the patent application of this case.

100: Universal interface card 110: Data transmission interface 111: Detection pin 112: Transmission pin 120:Universal serial bus module (USB module) 130: switch circuit 140: Detection circuit 141: the first voltage source 142: second voltage source T11: Transistor R11: the first resistor R12: Second resistor S10~S70: steps

[Fig. 1] is the circuit block diagram of one embodiment of the universal interface card of this case. [Fig. 2] is a schematic circuit diagram of one embodiment of the detection circuit of the universal interface card of this case. [Fig. 3] is a flow chart of the control switch circuit in one embodiment of the universal interface card of this case.

100: Universal interface card 110: Data transmission interface 111: Detection pin 112: Transmission pin 120:Universal serial bus module 130: switch circuit 140: Detection circuit

Claims (9)

A general-purpose interface card, conforming to the M.2 interface protocol and the B+M Type specification, including: a data transmission interface; a general-purpose serial bus module, electrically connected to the data transmission interface, for processing the data transmission A first signal transmitted by the interface; a switch circuit, arranged between the universal serial bus module and the data transmission interface, to control an operating state of the universal serial bus module, wherein the operating state is One of an open state and a closed state; and a detection circuit electrically connected to a detection pin of the data transmission interface and the switch circuit for detecting one of the detection pins the second signal, and control the switch circuit according to the second signal. The universal interface card as described in claim 1, wherein the universal serial bus module is electrically connected to a ninth pin (PIN9) of the data transmission interface. The universal interface card as claimed in claim 1, wherein the switch circuit is a power switch IC. The universal interface card as described in Claim 1, wherein the switch circuit is a USB signal switch circuit. The universal interface card as described in claim 1, wherein the detection circuit includes: a transistor having a control terminal, an output terminal and a ground terminal, the control terminal is electrically connected to the detection pin, the The output terminal is electrically connected to the switch circuit, and the ground terminal is used for grounding; A first resistor, both ends of which are electrically connected to a first voltage source and the control terminal of the transistor, for inputting a first voltage value to the control terminal; and a second resistor, whose two ends are respectively electrically connected In a second voltage source and the output end of the transistor, it is used to output a second voltage value to the output end. The universal interface card according to claim 5, wherein the transistor system is an N-type metal oxide semiconductor field effect transistor (NMOS). The universal interface card as described in claim 1, wherein the detection circuit controls the switch circuit to be in one of an enabled state and a disabled state according to the second signal sent by the detection pin. The universal interface card as described in claim item 7, wherein, when the second signal is a fluctuating signal, the detection circuit controls the switch circuit to the disabled state according to the second signal, so that the switch circuit does not conduct the Data transmission interface and the universal serial bus module; when the second signal is a non-fluctuating signal, the detection circuit controls the switch circuit to the enable state according to the second signal, so that the switch circuit conducts the data The transmission interface and the universal serial bus module. The universal interface card as described in claim 8, wherein, when the switch circuit is in the disabled state, the universal serial bus module cannot perform data transmission with the data transmission interface, so that the universal interface card does not support a USB Communication function; when the switch circuit is in the enable state, the universal serial bus module can perform data transmission with the data transmission interface, so that the universal interface card supports the USB communication function.

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