CN201508549U - Device and system for controlling on-off of USB (universal serial bus) interface - Google Patents
Device and system for controlling on-off of USB (universal serial bus) interface Download PDFInfo
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- CN201508549U CN201508549U CN2009201682638U CN200920168263U CN201508549U CN 201508549 U CN201508549 U CN 201508549U CN 2009201682638 U CN2009201682638 U CN 2009201682638U CN 200920168263 U CN200920168263 U CN 200920168263U CN 201508549 U CN201508549 U CN 201508549U
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Abstract
The utility model discloses a device and a system for controlling on-off of a USB (universal serial bus) interface. The device comprises a control command unit and a switch circuit unit, wherein the control command unit is connected with the control end of the switch circuit unit and is used for controlling the switching on or off of a first switch and a second switch of the switch circuit unit; a power port of a USB controller is coupled to the power port of the USB interface by the first switch, and a first serial data wire port of the USB controller is coupled to a corresponding first data wire port of the USB interface by the second switch. The utility model not only has the confidentiality of a software system, but also has the reliability of a hardware system. The control command unit has many control commands, which greatly lowers the cracking probability, thereby greatly enhancing the controlling safety of the USB interface.
Description
Technical field
The present invention relates to the computer port control device, the Apparatus and system of the break-make of control USB interface in relating in particular to.
Background technology
Along with development of electronic technology, electronic message unit is widely used each corner in people's modern life, becomes indispensable important tool in people's live and work.Simultaneously, for the ease of between various electronic message units, carrying out the information transmission, adopt the USB interface of serial communication mode to be widely used on the various electronic message units.
In some cases, need carry out break-make control to USB interface.For example, for guarantee on the electronic message unit personal electric information by the people illegally by USB mouth copy, need enabling of control USB interface, control the break-make of USB interface by the password mode, and this break-make to require be physically signal interruption.Also have, in commercial production, because the needs of test, production etc. are controlled enabling of USB port.
Industry mainly contains the break-make control of USB interface at present:
(1) by encryption software the USB interface passage is controlled; Its shortcoming is because encryption software is easy to be cracked by decompiling, so its security is not high enough; In case and computer enters safe mode, this encryption software does not just prove effective, and brings a lot of hidden danger thus.
(2) in the driving of USB,, make USB be in invalid state by rewriting the driver of USB chip; But this can crack by refreshing driver again, so security is not high yet.
(3) adopt the blocking way of damage type to forbid use to the physical interface of USB, to guarantee the safety of data to this interface.Obviously, this can produce USB interface and destroy, and is difficult for recovering, even can produce the permanent damage to subscriber equipment.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of Apparatus and system of controlling the USB interface break-make, can improve the reliability and the security of control on the whole.
In order to solve the problems of the technologies described above, the utility model provides the device of a kind of control USB (universal serial bus) (USB) interface break-make, comprises a control command unit and an on-off circuit unit, wherein:
The control command unit is connected with the control end of on-off circuit unit, is used for the closed or disconnection of first switch and the second switch of gauge tap circuit unit; The power port of one USB controller is coupled to the power port of USB interface by first switch, and the first serial data line cap of USB controller is coupled to corresponding first data line ports of USB interface by second switch.
Further,
The control command unit also is used for the closed or disconnection of the 3rd switch of gauge tap circuit unit; The second serial data line cap of USB controller is coupled to corresponding second data line ports of USB interface by the 3rd switch.
Further,
The control command unit sends enable command to the on-off circuit unit, controls first switch, second switch and the 3rd switch closure, to enable USB interface; Perhaps, send the forbidden energy order, control first switch, second switch and the 3rd switch and disconnect to the on-off circuit unit, thus the forbidden energy USB interface.
Further, the on-off circuit unit further comprises one first on-off circuit and a second switch circuit, wherein:
First switch is arranged in first on-off circuit, and second switch and the 3rd switch all are arranged in the second switch circuit;
The control command unit sends enable command or forbidden energy order by the first control command end to the control end of first on-off circuit, to control the closed of first switch or to disconnect; Simultaneously, send enable command or forbidden energy order to the control end of second switch circuit, with the closed or disconnection of control second switch, the 3rd switch by the second control command end.
Further,
First on-off circuit is a metal-oxide-semiconductor on-off circuit, and the second switch circuit is a high speed USB on-off circuit, wherein:
The grid of the metal-oxide-semiconductor in the metal-oxide-semiconductor on-off circuit (M1) then is connected with the first control command end, and grid is connected with the source electrode of metal-oxide-semiconductor (M1) by resistance (R3); This source electrode is connected with the power end of USB interface, and the drain electrode of metal-oxide-semiconductor (M1) is connected with the power end of USB controller, and this drain electrode is connected to the light emitting diode (L1) that a forward connects, the plus earth of this light emitting diode (L1) by resistance (R4);
The diode (D1) that connects by a forward at the source electrode of metal-oxide-semiconductor (M1) is connected to the power end of the USB switch in the high speed USB on-off circuit, at the negative electrode of diode (D1) by electric capacity (C1) ground connection; The steering logic end of this USB switch is connected with the second control command end by resistance (R1), at this steering logic end, is connected with the power end of USB interface by resistance (R2), and by resistance (R5) ground connection; Second switch is the first high speed USB switch that is arranged in this USB switch, and the 3rd switch is the second high speed USB switch that is arranged in the USB switch.
In order to solve the problems of the technologies described above, the utility model provides the system of a kind of control USB (universal serial bus) (USB) interface break-make, comprises USB interface control device, USB controller and USB interface, wherein:
The USB interface control device is controlled the closed of its one first an interior switch and a second switch or is disconnected;
The power port of USB controller is coupled to the power port of USB interface by first switch, and the first serial data line cap of USB controller is coupled to corresponding first data line ports of USB interface by second switch.
Further, the USB interface control device comprises a control command unit and an on-off circuit unit, wherein:
The control command unit is connected with the control end of on-off circuit unit, the closed or disconnection of first switch in the gauge tap circuit unit and second switch, and the also closed or disconnection of one the 3rd switch in the gauge tap circuit unit;
The second serial data line cap of USB controller is coupled to corresponding second data line ports of USB interface by the 3rd switch.
Further, the on-off circuit unit comprises one first on-off circuit and a second switch circuit, wherein:
First switch is arranged in first on-off circuit, and second switch and described the 3rd switch all are arranged in the second switch circuit;
The control command unit sends enable command or forbidden energy order by the first control command end to the control end of first on-off circuit, to control the closed of first switch or to disconnect; Simultaneously, send enable command or forbidden energy order to the control end of second switch circuit, with the closed or disconnection of control second switch and/or the 3rd switch by the second control command end.
The utility model, respectively the power lead of USB interface and the physics break-make of data line controls by the control of control command unit to three switches according to the standard of usb bus.The confidentiality that so not only has software systems has also had the reliability of hardware system simultaneously.Because the control command of control command unit is many, thus the probability that is cracked reduced greatly, thus strengthened the security of USB interface control greatly.
Description of drawings
Fig. 1 is the system of control USB interface break-make of the present utility model and the structure side figure that installs first embodiment;
Fig. 2 is the system of control USB interface break-make of the present utility model and the structure side figure that installs second embodiment;
Fig. 3 is the schematic diagram of the concrete enforcement circuit of system shown in Figure 2 and device embodiment.
Embodiment
The system and the device of the control USB interface break-make that the utility model provides, its inventive concept is, by the control of a control command unit to a plurality of switches, come respectively the physics break-make of the USB controller of electronic equipment and the power lead between the USB interface, data line is controlled, thus make electronic equipment can no thoroughfare under unwarranted situation USB interface copy any information or communicate to External memory equipment.
Below in conjunction with accompanying drawing and preferred embodiment the technical solution of the utility model is at length set forth.The embodiment that below exemplifies only is used for description and interpretation the utility model, and does not constitute the restriction to technical solutions of the utility model.
As shown in Figure 1, be first embodiment of the system of the control USB interface break-make that provides of the utility model, comprise USB interface control device 100, USB controller 200 and USB interface 300, wherein USB interface control device embodiment 100 comprises control command unit 110, an on-off circuit unit 120, wherein:
In the time USB controller 200 and USB interface 300 will being connected, control command unit 110 sends enable command to on-off circuit unit 120, to control first switch closure, make the power lead VCC between USB controller 200 and the USB interface 300 connect, and control second switch and the 3rd switch closure, make that corresponding data line DATA+, DATA-also connect respectively between USB controller 200 and the USB interface 300, thereby enable USB interface 300; In the time USB controller 200 and USB interface 300 will being disconnected, control command unit 110 sends the forbidden energy instruction to on-off circuit unit 120, disconnect to control above-mentioned three switches, make the power lead VCC between USB controller 200 and the USB interface 300 disconnect, and make that corresponding data line DATA+, DATA-also disconnect respectively between them, thereby forbidden energy USB interface 300.
Be second embodiment of the system of the control USB interface break-make that provides of the utility model as shown in Figure 2, different with embodiment shown in Figure 1 is, on-off circuit unit 120 is divided into first on-off circuit 120 and second switch circuit 130, wherein first switch is the controlled switch on first on-off circuit, and second switch, the 3rd switch then are two controlled switchs on the second switch circuit; Control principle and aforementioned basic identical is so repeat no more.
As shown in Figure 3, it is the concrete schematic diagram of implementing circuit of device embodiment shown in Figure 2, wherein, control command unit 110 among Fig. 2 is to adopt the parallel interface 10 of PC to serve as at Fig. 2, USB controller 200 among Fig. 1 is the USB chip 20 of this PC inside in Fig. 3, USB interface 300 among Fig. 2 is USB interface 30 in Fig. 3, first on-off circuit 120 among Fig. 1 in Fig. 3 corresponding to a metal-oxide-semiconductor on-off circuit 40, the second switch circuit 130 among Fig. 2 in Fig. 3 corresponding to high speed USB on-off circuit 50; Wherein:
PC parallel interface 10 is used to transmit the control signal that PC sends, the switch of control metal-oxide-semiconductor on-off circuit 40 and the switch closure or the shutoff of high speed USB on-off circuit 50.
Because this PC parallel interface 10 has memory function, so the control signal that PC sends can be remained stable state.This PC parallel interface 10 is one 25 pin D connectors, and the input and the output of signal are provided, and 8 output data lines, 4 output control lines, 5 input state lines are wherein arranged, and as shown in table 1, its address is respectively 378H, 379H and 37AH.
Table 1
| Signal type | Data-signal | Status signal | Control signal |
| The address | 378H | 379H | 37AH |
| Direction | OUT | IN | OUT |
| The position | D0-D7 | D3D4D5D6D7 | D0D1D2D3 |
| Connector pinout | P2---P9 | P10，P11，P12，P13，P15 | P1，P14，P16，P17 |
Send 8 control signals by the 378H register to metal-oxide-semiconductor on-off circuit 40 and high speed USB on-off circuit 50, control the logic state of each switch.After metal-oxide-semiconductor on-off circuit and high speed USB switch receive control signal from PC parallel interface 10, respond this control signal respectively, corresponding switch is placed make-position, like this USB chip 20 just and USB interface 30 just connected.
In Fig. 3, USB chip 20 is used for sending and the received communication data, and the NLAS7222B chip that while its power end VCC also is respectively the high speed USB on-off circuit provides power supply.
When PC when the 378H of PC parallel interface 10 register writes control word 0x00, the DATA_SW pin becomes low level, by resistance R 1, R2 and the coupling of R5 dividing potential drop, make the steering logic port S of NLAS7222B chip of high speed USB on-off circuit also for low level, then port D+ is connected with port HSD1+, port D-is connected with port HSD1-, serial data interface DATA+, the DATA-of USB chip 20 are connected with USB interface 30 corresponding interface DATA+, DATA-respectively like this, and then the communication link of USB is enabled.
When PC when the 378H of PC parallel interface 10 register writes control word 0xFF, the DATE_SW pin becomes high level, make the steering logic port S of NLAS7222B chip of USB speed-sensitive switch also for low level, then port D+ and port HSD1+ disconnect, port D-and port HSD1-disconnect, USB chip 20 and USB interface 30 corresponding serial data interface DATA+, DATA-disconnect like this, and then the communication link of USB is by forbidden energy.
R1 in Fig. 3 and the effect of R5 are dividing potential drops, guarantee that the steering logic S pin of NLAS7222B chip uncertain state can not occur when having the control signal of PC parallel interface 10.
In Fig. 3, the VCC power pin of USB interface 30 is connected with the source electrode (being the S utmost point) of the metal-oxide-semiconductor M1 of metal-oxide-semiconductor on-off circuit, the VCC pin of USB chip 20 is connected with the drain electrode of this metal-oxide-semiconductor M1 (being the D utmost point), the grid of this metal-oxide-semiconductor M1 (being the G utmost point) then is connected with the PWR_SW pin of PC parallel interface 10, and this G utmost point is connected with the S utmost point by resistance R 3, and be connected to the power supply VCC pin of NLAS7222B chip at the diode D1 that this S utmost point connects by forward, at the negative electrode of this diode D1 by capacitor C 1 ground connection; The D utmost point of this metal-oxide-semiconductor M1 is connected to the light emitting diode L1 that a forward connects by resistance R 4.
When PC when the 378H of PC parallel interface 10 register writes control word 0x00, the PWR_SW pin is in low level, at this moment the gate source voltage of metal-oxide-semiconductor M1 (Vg-Vs)＜0, the then S utmost point of M1 and the conducting of the D utmost point, make the VCC pin of USB chip 20 be connected with the VCC pin of USB interface 30, make simultaneously and be enabled also conducting of light emitting diode L1 as this USB interface of the luminous indication of pilot lamp user.
Otherwise, when PC when the 378H of PC parallel interface 10 register writes control word 0xFF, the PWR_SW signal is in high level, at this moment the gate source voltage of metal-oxide-semiconductor M1 (Vg-Vs) is approximately 0, then the S utmost point of M1 and the D utmost point are in high-impedance state, make the VCC pin of USB chip 20 and the VCC pin of USB interface 30 disconnect, not conducting of light emitting diode L1 is simultaneously extinguished indication user USB interface by forbidden energy.The situation of the steering logic of PC parallel interface 10 and metal-oxide-semiconductor switch and high speed USB switch (NLAS7222B chip) is as shown in table 2.
Table 2
| The steering logic state of PC parallel interface 378H | M1 pipe S-D utmost point state | The high speed USB on off state | Led status | USB interface |
| 0x00 | Conducting | Closed | Bright | Enable |
| 0xFF | High-impedance state | Disconnect | Put out | Forbidden energy |
Above content is to further describing that the present invention did in conjunction with concrete preferred implementation, wherein control module has multiple mode to exist, as serial line interface or the like, above content can not assert that with reference to the operation instruction of NLAS7222B on-off circuit concrete enforcement of the present invention is confined to these explanations simultaneously.For the present invention and method person of an ordinary skill in the technical field, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (8)
1. the device of control USB (universal serial bus) (USB) interface break-make is characterized in that, comprises a control command unit and an on-off circuit unit, wherein:
Described control command unit is connected with the control end of described on-off circuit unit, is used to control the closed of first switch of described on-off circuit unit and second switch or disconnects; The power port of one USB controller is coupled to the power port of USB interface by described first switch, and the first serial data line cap of described USB controller is coupled to corresponding first data line ports of described USB interface by described second switch.
2. according to the described device of claim 1, it is characterized in that,
Described control command unit also is used to control the 3rd switch closed of described on-off circuit unit or disconnects; The second serial data line cap of described USB controller is coupled to corresponding second data line ports of described USB interface by described the 3rd switch.
3. according to the described device of claim 2, it is characterized in that,
Described control command unit sends enable command to described on-off circuit unit, controls described first switch, described second switch and described the 3rd switch closure, so that the described USB interface of energy; Perhaps, send the forbidden energy order, control described first switch, described second switch and described the 3rd switch and disconnect to described on-off circuit unit, thus the described USB interface of forbidden energy.
4. according to the described device of claim 3, it is characterized in that described on-off circuit unit further comprises one first on-off circuit and a second switch circuit, wherein:
Described first switch is arranged in described first on-off circuit, and described second switch and described the 3rd switch all are arranged in described second switch circuit;
Described control command unit sends enable command or forbidden energy order by the first control command end to the control end of described first on-off circuit, to control the closed of described first switch or to disconnect; Simultaneously, send enable command or forbidden energy order to the control end of described second switch circuit, to control the closed of described second switch, the 3rd switch or to disconnect by the second control command end.
5. according to the described device of claim 4, it is characterized in that,
Described first on-off circuit is a metal-oxide-semiconductor on-off circuit, and described second switch circuit is a high speed USB on-off circuit, wherein:
The grid of the metal-oxide-semiconductor (M1) in the described metal-oxide-semiconductor on-off circuit then is connected with the described first control command end, and described grid is connected with the source electrode of described metal-oxide-semiconductor (M1) by resistance (R3); Described source electrode is connected with the power end of described USB interface, the drain electrode of described metal-oxide-semiconductor (M1) is connected with the power end of described USB controller, and described drain electrode is connected to the light emitting diode (L1) that a forward connects, the plus earth of described light emitting diode (L1) by resistance (R4);
The diode (D1) that connects by a forward at the source electrode of described metal-oxide-semiconductor (M1) is connected to the power end of the USB switch in the described high speed USB on-off circuit, at the negative electrode of described diode (D1) by electric capacity (C1) ground connection; The steering logic end of described USB switch is connected with the described second control command end by resistance (R1), at described steering logic end, is connected with the power end of described USB interface by resistance (R2), and by resistance (R5) ground connection; Described second switch is the first high speed USB switch that is arranged in described USB switch, and described the 3rd switch is the second high speed USB switch that is arranged in described USB switch.
6. the system of control USB (universal serial bus) (USB) interface break-make comprises USB interface control device, USB controller and USB interface, wherein:
Described USB interface control device is controlled the closed of its one first an interior switch and a second switch or is disconnected;
The power port of described USB controller is coupled to the power port of USB interface by described first switch, and the first serial data line cap of described USB controller is coupled to corresponding first data line ports of described USB interface by described second switch.
7. according to the described system of claim 6, it is characterized in that described USB interface control device comprises a control command unit and an on-off circuit unit, wherein:
The control command unit is connected with the control end of described on-off circuit unit, the closed or disconnection of described first switch in controlling described on-off circuit unit and described second switch, also control the closed or disconnection of one the 3rd switch in the described on-off circuit unit;
The second serial data line cap of described USB controller is coupled to corresponding second data line ports of described USB interface by described the 3rd switch.
8. according to the described system of claim 7, it is characterized in that described on-off circuit unit further comprises one first on-off circuit and a second switch circuit, wherein:
Described first switch is arranged in described first on-off circuit, and described second switch and described the 3rd switch all are arranged in described second switch circuit;
Described control command unit sends enable command or forbidden energy order by the first control command end to the control end of described first on-off circuit, to control the closed of described first switch or to disconnect; Simultaneously, send enable command or forbidden energy order to the control end of described second switch circuit, to control the closed of described second switch and/or the 3rd switch or to disconnect by the second control command end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201682638U CN201508549U (en) | 2009-09-02 | 2009-09-02 | Device and system for controlling on-off of USB (universal serial bus) interface |
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|---|---|---|---|
| CN2009201682638U CN201508549U (en) | 2009-09-02 | 2009-09-02 | Device and system for controlling on-off of USB (universal serial bus) interface |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101901559A (en) * | 2010-07-30 | 2010-12-01 | 中国船舶重工集团公司第七○九研究所 | Safety control method for USB (Universal Serial Bus) interface |
| CN102170104A (en) * | 2011-03-24 | 2011-08-31 | 珠海艾派克微电子有限公司 | Data exchange apparatus |
| CN103473206A (en) * | 2013-09-17 | 2013-12-25 | 广东威创视讯科技股份有限公司 | Data transmission method and I2C (Inter-Integrated Circuit) interface extender |
| CN104252430A (en) * | 2013-06-28 | 2014-12-31 | 联想(北京)有限公司 | State indicating method and electronic equipment |
| CN104572363A (en) * | 2013-10-15 | 2015-04-29 | 航天信息股份有限公司 | Device and method for testing recognition reliability of USB equipment |
| CN104572364A (en) * | 2013-10-15 | 2015-04-29 | 航天信息股份有限公司 | Device and method for testing recognition reliability of USB equipment |
| CN104777385A (en) * | 2015-04-21 | 2015-07-15 | 东莞华贝电子科技有限公司 | Jig and method for detecting power supply reverse connection and data reverse connection protection function of mobile terminal |
| CN104780156A (en) * | 2015-03-17 | 2015-07-15 | 成都盛思睿信息技术有限公司 | Secure cloud desktop system and USB access control method thereof |
| CN105159856A (en) * | 2015-08-24 | 2015-12-16 | 小米科技有限责任公司 | Signal transmission apparatus and terminal |
| CN105824775A (en) * | 2016-03-11 | 2016-08-03 | 联想(北京)有限公司 | Electronic equipment and information processing method |
| CN106294256A (en) * | 2016-08-09 | 2017-01-04 | 乐视控股（北京）有限公司 | Recognition methods and identification device |
| CN106919525A (en) * | 2015-12-28 | 2017-07-04 | 航天信息股份有限公司 | A kind of USB device clustered control apparatus and system |
| CN107124170A (en) * | 2017-04-27 | 2017-09-01 | 苏州博众精工科技有限公司 | A kind of USB high speed signals on-off control circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101901559A (en) * | 2010-07-30 | 2010-12-01 | 中国船舶重工集团公司第七○九研究所 | Safety control method for USB (Universal Serial Bus) interface |
| CN102170104A (en) * | 2011-03-24 | 2011-08-31 | 珠海艾派克微电子有限公司 | Data exchange apparatus |
| CN104252430A (en) * | 2013-06-28 | 2014-12-31 | 联想(北京)有限公司 | State indicating method and electronic equipment |
| CN103473206A (en) * | 2013-09-17 | 2013-12-25 | 广东威创视讯科技股份有限公司 | Data transmission method and I2C (Inter-Integrated Circuit) interface extender |
| CN103473206B (en) * | 2013-09-17 | 2016-08-17 | 广东威创视讯科技股份有限公司 | A kind of data transmission method and I2C Interface Extender |
| CN104572363B (en) * | 2013-10-15 | 2018-10-09 | 航天信息股份有限公司 | A kind of device and method of test USB device identification certainty |
| CN104572363A (en) * | 2013-10-15 | 2015-04-29 | 航天信息股份有限公司 | Device and method for testing recognition reliability of USB equipment |
| CN104572364A (en) * | 2013-10-15 | 2015-04-29 | 航天信息股份有限公司 | Device and method for testing recognition reliability of USB equipment |
| CN104572364B (en) * | 2013-10-15 | 2018-11-13 | 航天信息股份有限公司 | A kind of device of test USB device identification certainty |
| CN104780156A (en) * | 2015-03-17 | 2015-07-15 | 成都盛思睿信息技术有限公司 | Secure cloud desktop system and USB access control method thereof |
| CN104777385A (en) * | 2015-04-21 | 2015-07-15 | 东莞华贝电子科技有限公司 | Jig and method for detecting power supply reverse connection and data reverse connection protection function of mobile terminal |
| CN105159856A (en) * | 2015-08-24 | 2015-12-16 | 小米科技有限责任公司 | Signal transmission apparatus and terminal |
| CN105159856B (en) * | 2015-08-24 | 2019-03-29 | 小米科技有限责任公司 | Signal transmitting apparatus and terminal |
| CN106919525A (en) * | 2015-12-28 | 2017-07-04 | 航天信息股份有限公司 | A kind of USB device clustered control apparatus and system |
| CN105824775A (en) * | 2016-03-11 | 2016-08-03 | 联想(北京)有限公司 | Electronic equipment and information processing method |
| CN106294256A (en) * | 2016-08-09 | 2017-01-04 | 乐视控股（北京）有限公司 | Recognition methods and identification device |
| CN107124170A (en) * | 2017-04-27 | 2017-09-01 | 苏州博众精工科技有限公司 | A kind of USB high speed signals on-off control circuit |
| CN107124170B (en) * | 2017-04-27 | 2020-05-12 | 博众精工科技股份有限公司 | USB high-speed signal on-off control circuit |
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