CN2783391Y - Plug-pull free multi-state USB device - Google Patents
Plug-pull free multi-state USB device Download PDFInfo
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- CN2783391Y CN2783391Y CN 200420003402 CN200420003402U CN2783391Y CN 2783391 Y CN2783391 Y CN 2783391Y CN 200420003402 CN200420003402 CN 200420003402 CN 200420003402 U CN200420003402 U CN 200420003402U CN 2783391 Y CN2783391 Y CN 2783391Y
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Abstract
The utility model provides a plug-pull free multi-state USB device, which comprises a nonvolatile memory and a volatile memory, wherein a USB controller is coupled to the volatile memory and the nonvolatile memory to read and to write data and to execute programs; a USB interface and a state converting switch are coupled to the USB controller, wherein the USB controller comprises a USB broken circuit simulator and a USB connection simulator; the USB broken circuit simulator and the USB connection simulator are connected to the state converting switch. When the state converting switch switches states, analog signals which are disconnected (pulled out) by the multi-state USB device are generated on the USB interface, and then, analog signals which are connected by the multi-state USB device are generated. The utility model realizes automatic identification and drive to the states of a USB mobile storage disc, and is convenient for users.
Description
Technical field
The utility model relates to computer application field, is specifically related to a kind of multi-mode USB device of exempting to plug.
Background technology
USB (USB (universal serial bus)) mobile storage disc is a kind of Flash (flash memory) technology that adopts current advanced person, with the Flash chip is storage medium, adopt the integrated control chip of specialty, mobile storage device by USB interface and computing machine swap data, do not need external power supply, hot-swappable, light and handy, exquisite, capacity is big, reliability is high; The storage data are erasable more than 1,000,000 times, and the data holding time surpasses 10 years, and read or write speed is more than 50 times of floppy disk.Mobile storage makes more and more convenient, the safety of the interchange of data have the incomparable advantage of traditional floppy drive and floppy disk, so the USB portable hard drive begins to replace rapidly floppy disk, has obtained the extensive concern of numerous manufacturers, and has caused intense market competition.So increasing new function begins to add wherein, for example application functions such as QQ, encryption, self-starting, data backup and recovery all become producer in order to attract user's attraction.
Existing actuated type USB mobile storage disc comprises a microprocessor, the FLASH storer that links to each other with microprocessor and the USB interface that links to each other with main frame, and it also comprises the change-over switch of a ZIP/FDD (subregion/floppy drive) function.When switch was in the ZIP state, system identification was standard floppy drive and moveable magnetic disc of a 1.44M; When switch is in the FDD state, then is identified as the standard floppy drive of a 1.44M, and can be used as the boot disk use.
The utility model of having authorized " the high capacity mobile memory of USB (universal serial bus) ", application number be disclose in 01200990.3 the instructions a kind of by plugging the USB mobile memory that the USB mobile memory realizes that its two kinds of user modes are switched again.
Enter PCT application (the PCT application number: PCT/IL00/00555 of China, publication number: WO01/23987) " be used for detachable, active, the equipment of Personal Storage, system and method ", disclose the USB mobile memory that a kind of USB mobile memory that switches by automatic download Firmware state of a control realizes that its two kinds of user modes are switched in its instructions, needed to install other driver and realize.
Yet, above-mentioned two kinds of schemes in use bring constant greatly for the user: because the user is when using actuated type USB mobile storage disc, usually do not remember which kind of state the ZIP/FDD switch on the dish is in clearly, system identification finishes after plugging, by checking explorer, find that just the state of living in of USB mobile storage disc switch is not right, have to pull up again, switch is dialed to the tram, plug waiting system again and discern again and just can use after finishing.Though or do not need to plug again the USB mobile storage disc, but need for this reason function that particular driver is installed in addition, make the user to use not installing on the computing machine change driving, limited the movability of USB mobile storage disc greatly, also reduced practical efficient.
Fig. 1 has described the hardware block diagram of USB mobile storage disc of the prior art, and wherein ROM and RAM are used to store data and program, and EEPROM is used for depositing vendor code/product code essential informations such as (VID/PID).The USB controller is connected with the FLASH storer by system bus or general purpose I/O line, according to the order of main frame flush memory device is carried out read/write/format, realizes the conversion between logic sector and the physical sector, operations such as data error correcting.
Fig. 2 has described the structural representation that USB in the prior art transmits the quadded cable of signal and power supply, and wherein, two lines of data line D+, D-are to be used to send signal, and present standard has two kinds of data transmission rates.Wherein the bit rate of high speed signal is decided to be 12Mbps, and the pattern that low speed signal transmits is decided to be 1.5Mbps; Two kinds of patterns can automatically dynamically be switched under the situation with same usb bus transmission.In addition, USB cable also comprises two lines of VBUS, GND, and wherein VBUS use+5V power supply provides power supply to USB device, and GND is a ground wire.
Usb terminal equipment is positioned at the afterbody of cable as flash memory disk, but computing machine each port all sense terminals whether connect or separate, and distinguish at a high speed or low-speed device.Insert or when pulling out a usb terminal equipment, can not influence the operate as normal of all the other equipment in the network.Lay down a usb terminal equipment and only will end communicating by letter of this equipment and intercomputer, this moment, hub can make the port of original connection lose efficacy, and reported that to the computing machine machine this port is interrupted (equipment is removed).Computing machine machine one will be deleted this equipment after receiving and disconnecting notice, upgrades topology information.Usually, the computing machine USB interface is detecting signal wire D+ on the USB port, voltage on the D-line at V
ILBe that 0.8V is following and keep 2.5us when above, computing machine thinks that this port is interrupted.
After computing machine detects attended operation, can make that the hub port that is connected comes into force, therefore equipment also can reset.Usually, the voltage of the signal wire D-of computing machine USB interface or D+ is at V
IHBe more than the 2.0V, and when keeping 2.5us above, computing machine think that this port connects.Operating system begins identification equipment again, the transmission of USB port commencing signal.
The utility model content
The purpose of this utility model provides a kind of based on the novel USB mobile storage disc of exempting from the technology of plugging fully that meets usb protocol.Its ZIP/FDD two states can freely switch by toggle switch, and not need to install any driver under the situation that need not plug again, helps the more convenient use of user with saving time.
In order to realize the purpose of this utility model, the utility model provides a kind of multi-mode USB device of exempting to plug, and comprising:
Nonvolatile memory is used for the program of the described device of storage running and fixing data;
Volatile memory is used for the data of the described device of storage running;
The USB controller is coupled to described volatile memory and nonvolatile memory, to read and write data and executive routine;
USB interface is coupled to described USB controller; With
State switch is coupled to described USB controller;
Wherein, described USB controller comprises that the USB simulator that opens circuit is connected simulator with USB, the described USB simulator that opens circuit is connected simulator and is connected to described state switch with USB, when described state switch switching state, on described USB interface, produce the simulating signal that described multi-mode USB device is disconnected (pulling out), produce the simulating signal that described multi-mode USB device is connected again then.
Alternatively, described multi-mode USB device is the actuated type USB mobile storage disc of exempting to plug, and described nonvolatile memory comprises EPROM or EEPROM, is used to deposit vendor code/product code essential informations such as (VID/PID); Described state switch is the ZIP/FDD switch, and wherein, described device also comprises: FLASH (flash memory) storer, be coupled to described USB controller, and the equipment that is used for being connected with described USB interface carries out exchanges data;
Preferably, described USB controller carries out read/write/format according to the order of main frame to flush memory device by system bus or general purpose I/O line and the coupling of described FLASH (flash memory) storer; Described USB controller is by system bus or general purpose I/O line and described volatile memory and nonvolatile memory coupling.
Alternatively, this device also comprises restorer, is used for after the simulating signal that produces described disconnection (pulling out), and the USB control chip resets.
Preferably, described restorer is after receiving the state exchange signal of state exchange signal generation apparatus generation, to produce the reset signal that is used for described device.
Alternatively, the described USB simulator that opens circuit is connected simulator and comprises time-delay trigger and voltage plastic filter circuit with USB, described time-delay trigger produces according to described state exchange signal and satisfies the trigger pip that described USB device sequential requires, and described trigger pip is shaped as described simulating signal and the connection mode analog signal of opening circuit by described voltage plastic filter circuit.
Preferably, described voltage plastic filter circuit is active or passive RC (capacitance-resistance) network or LC (LC) network or LCR (capacitance-resistance sense) network or RL (resistance sense) network.
Alternatively, described time-delay trigger comprises one 555 chip, and switch switching signal generating means comprises ZIP and two hand switches of FDD.
The utility model also provides a kind of device of multi-mode USB of realizing on USB interface to exempt to plug the method for switching state, and the device of described multi-mode USB is by USB interface and premise equipment coupling, and described method comprises step:
Send the switching state request signal,
Adjust signal on the signal wire of described USB device for being equivalent to off-state,
Keep described first schedule time of signal that is equivalent to off-state, be disconnected so that described premise equipment is judged the device of described multi-mode USB;
The USB device that resets is equivalent to the signal of plugging state once more to produce on the signal wire of described USB device;
Keep describedly being equivalent to second schedule time of signal of plugging state once more, be connected so that described premise equipment is judged the device of described multi-mode USB.
Alternatively, the step of the signal on the signal wire of the described USB device of wherein said adjustment comprises that the voltage on signal wire D+, the D-that adjusts described USB device adjusts to the voltage V of logical zero simultaneously
ILBelow.
Preferably, the described generation step that is equivalent to the signal of plugging state once more comprises one voltage among described signal wire D+ or the D-is adjusted to logical one voltage V
IHMore than, another remains on V
ILBelow.
Alternatively, described first schedule time and second schedule time are more than the 2.5us.
Utilize the utility model, realized the automatic identification and the driving of USB mobile storage disc state have been made things convenient for the user.
Description of drawings
Fig. 1 is the hardware block diagram of USB mobile storage disc of the prior art;
Fig. 2 is the structural representation that USB transmits the quadded cable of signal and power supply in the prior art;
Fig. 3 is the state exchange process flow diagram to the automatic identification and the driving of USB mobile storage disc state of embodiments of the invention;
Fig. 4 is the synoptic diagram of the voltage signal on USB port signal wire D+, the D-when stirring the ZIP/FDD switch that the simulator that opens circuit of embodiments of the invention produces;
Fig. 5 is the synoptic diagram of the voltage signal on the connection simulator in the hardware circuit of embodiments of the invention the USB port signal wire D+, the D-that produce;
Fig. 6 is the theory diagram of device of the completion status handoff functionality of embodiment of the present utility model;
Fig. 7 A is USB controller chip and a syndeton synoptic diagram thereof in the USB mobile storage disc of embodiment of the present utility model;
Fig. 7 B is two memory chips and a syndeton synoptic diagram thereof in the USB mobile storage disc of embodiment of the present utility model;
Fig. 7 C is clock chip and a syndeton synoptic diagram thereof in the USB mobile storage disc of embodiment of the present utility model;
Fig. 8 is that the USB port signal wire D-of embodiment of the present utility model goes up the voltage signal synoptic diagram of test.
Specific embodiment
For those skilled in the art being understood and implementing the utility model, now describe the utility model with reference to accompanying drawing in conjunction with the embodiments.
With reference to Fig. 3, the state exchange process flow diagram to the automatic identification and the driving of USB mobile storage disc state of embodiment of the present utility model has been described.In embodiment of the present utility model, at first, in step 310, stir the ZIP/FDD switch, the simulator that opens circuit that the change of this on off state is controlled in the hardware circuit of the present utility model is adjusted to V in step 320 simultaneously with the voltage on signal wire D+, the D-on the USB port
ILBelow, for 0.8V following (this moment, this port was no longer by hub control), then, in step 330, produce a SE0 state (showing the state that USB disconnects), and this state is kept more than the 2.5us in the present embodiment at downlink port.Fig. 4 has described the synoptic diagram of embodiment of the present utility model voltage signal on USB port D+, the D-when stirring the ZIP/FDD switch.
In step 340, USB port detects (SE0 state) behind this signal will end communicating by letter between this equipment and main frame, and this moment, hub can make the port of original connection lose efficacy, and warned this port to be interrupted (equipment is removed) to main frame.Main frame is received and is disconnected this equipment of notice back deletion, upgrades topology information simultaneously.Then, the restorer in the hardware circuit of the present utility model is about to this USB controller chip and carries out reset operation in the resetting pin zero setting of step 350 with the USB controller chip.Then, the connection simulator in the hardware circuit of the present utility model is adjusted to V in step 360 with one voltage among signal wire D+ on the USB port or the D-
IHBe more than the 2.0V, and keep more than the 2.5us that wherein, another remains on V
ILBelow.Fig. 5 shows the voltage signal on USB port signal wire D+, the D-that the connection simulator in the hardware circuit of the present utility model produces.
In step 370, hub finds that the voltage on the data lines wherein surpasses 2.5us greater than duration of its critical value, and then usb hub comes into force, and operating system begins identification equipment again, the transmission of USB port commencing signal.
In step 380, system identification is finished, and the state exchange of USB mobile storage disc finishes.
Fig. 6 shows the theory diagram of device of the completion status handoff functionality of embodiment of the present utility model.Stir the switch (not shown) that the ZIP/FDD state switches, produce a single pulse signal by switch switching circuit 610, this single pulse signal is used as the input of USB controller reset circuit 620 on the one hand, the RETN pin of USB controller chip will be directly linked in the output of this circuit 620, cause resetting of this chip and control timing with this; This single pulse signal is imported by the signal of timer-operated time-delay trigger 630 on the other hand as one, this time-delay trigger 630 is with voltage plastic filter circuit 640, voltage on signal wire D+, the D-of control USB port, produce as Fig. 4 and Fig. 5 and signal shown in Figure 8, reach the purpose of switching state thus.
Fig. 7 A, B, C show the circuit theory diagrams of the USB mobile storage disc general structure of embodiment of the present utility model jointly.Among Fig. 7 A, the model of USB controller chip 701 is 3S666X-48, is used to control the operation of USB, produces various control signals and clock signal.Memory chip 702,703 is the Flash memory chip of the 16M of Hyundai company production among Fig. 7 B.USB controller chip 701 control store chips 702,703 are finished the control of memory function.Device 704 is 555 clock chips among Fig. 7 C, the similar chip that this chip can be produced with any company, it and resistance 705, first electric capacity 706, second electric capacity, 707 operational amplifiers, 708 elements are together, be used to realize the delay trigger circuit of state exchange signal, difference according to the chip of used company, this circuit is also slightly different, but its function all is identical, can adopt any can realize delaying time trigger the circuit of function.In the utility model, realize the action of simulation USB plug by delay trigger circuit.By these circuit, produce the signal that USB is pulled up, promptly these circuit constitute the simulator that opens circuit, and the voltage on signal wire D+, the D-on the USB port is adjusted to V simultaneously
ILBe below the 0.8V; Produce a SE0 state at downlink port, and this state is kept more than the 2.5us, to end communicating by letter between this equipment and main frame, this moment, hub can make the port of original connection lose efficacy, and reported that to main frame this port is interrupted.Produce the signal that USB plugs again then, so that use the machine recognition USB device of USB, soon signal wire D+ on the USB port or one voltage among the D-are adjusted to V
IHBe more than the 2.0V, and keep more than the 2.5us that wherein, another remains on V
ILBelow.Hub find on the data lines wherein voltage surpass 2.5us greater than duration of its critical value, then usb hub comes into force, operating system begins identification equipment again, the transmission of USB port commencing signal.Resistance 709 and electric capacity 710 elements constitute RC voltage plastic filter circuit, are used for the infringement of anti-stop signal to machine.Circuit 711 is anti-phase Schmidt trigger, is used to cooperate the reset signal of USB timing sequence generating USB controller, and persons skilled in the art know have a lot of methods to realize anti-phase Schmidt trigger, are not described in detail here.In addition, the clock circuit in the circuit is known to persons skilled in the art, here depicted in greater detail not.In circuit, mouthpiece 712 is general usb signal mouthpiece, is used for and host interface.714 two hand switches of first switch 713 and second switch constitute state switching signal generating means, be used to control delay trigger circuit realize opening circuit analog functuion be connected analog functuion.
Though embodiment of the present utility model has only described the mobile storage disc at the USB of a two condition, should know, the utility model is applicable to the USB device of all a plurality of states, as long as behind this USB change state, by simulating this USB, just go for the USB device of all a plurality of states by the signal of plugging again after pulling up.In fact, the utility model is applicable to any device, as long as use the machine of this device that recognition function is arranged, the signal of plugging again after can pulling up by simulation triggers the change that it discerns this unit state, to be applicable to the state of change.
Though described the utility model by embodiment, persons skilled in the art are known, do not break away from spirit of the present utility model, and many improvement and distortion can be arranged, and these improvement and distortion and equivalent transformation are all in protection domain of the present utility model.
Claims (9)
1, a kind of multi-mode USB device of exempting to plug comprises:
Nonvolatile memory is used for the program of the described device of storage running and fixing data;
Volatile memory is used for the data of the described device of storage running;
The USB controller is coupled to described volatile memory and nonvolatile memory, to read and write data and executive routine;
USB interface is coupled to described USB controller;
It is characterized in that also comprising: state switch, be coupled to described USB controller;
Wherein, described USB controller comprises that the USB simulator that opens circuit is connected simulator with USB, the described USB simulator that opens circuit is connected simulator and is connected to described state switch with USB, when described state switch switching state, on described USB interface, produce the simulating signal that described multi-mode USB device is disconnected, produce the simulating signal that described multi-mode USB device is connected again then.
2, device as claimed in claim 1 is characterized in that, described multi-mode USB device is the actuated type USB mobile storage disc of exempting to plug, and described nonvolatile memory comprises EPROM or EEPROM, is used to deposit essential informations such as vendor code/product code; Described state switch is the ZIP/FDD switch, and wherein, described device also comprises: flash memories, be coupled to described USB controller, and the equipment that is used for being connected with described USB interface carries out exchanges data; Described USB controller carries out read/write/format according to the order of main frame to flush memory device by system bus or general purpose I/O line and the coupling of described flash memories; Described USB controller is by system bus or general purpose I/O line and described volatile memory and nonvolatile memory coupling.
3, device as claimed in claim 1 or 2 is characterized in that also comprising restorer, is used for after the simulating signal that produces described disconnection, and the USB control chip resets.
4, device as claimed in claim 3 is characterized in that, described restorer is after receiving the state exchange signal of state exchange signal generation apparatus generation, to produce the reset signal that is used for described device.
5, device as claimed in claim 1 or 2, it is characterized in that, the described USB simulator that opens circuit is connected simulator with USB and comprises timing device, to keep described first schedule time of the simulating signal that is disconnected, produce the simulating signal that described multi-mode USB device is connected again then, keep described second schedule time of the simulating signal that is connected.
6, device as claimed in claim 5, it is characterized in that, described timing device comprises time-delay trigger and voltage plastic filter circuit, described time-delay trigger produces according to the state exchange signal and satisfies the trigger pip that described USB device sequential requires, and described trigger pip is shaped as described simulating signal and the connection mode analog signal of opening circuit by described voltage plastic filter circuit.
7, device as claimed in claim 6 is characterized in that, described voltage plastic filter circuit is active or passive resistance-capacitance network or L.C. network or capacitance-resistance sense network or resistance sense network; Described time-delay trigger comprises one 555 chip, and switch switching signal generating means comprises ZIP and two hand switches of FDD.
8, device as claimed in claim 1 or 2 is characterized in that, the described USB simulator that opens circuit is connected simulator with USB and comprises adjusting gear, is used for adjusting simultaneously voltage on signal wire D+, the D-of described USB device to the voltage V of logical zero
ILBelow; And/or one voltage among described signal wire D+ or the D-adjusted to logical one voltage V
IHMore than, another remains on V
ILBelow.
9, device as claimed in claim 5 is characterized in that, described timing device controlled for first schedule time and second schedule time was more than the 2.5us.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420003402 CN2783391Y (en) | 2004-02-09 | 2004-02-09 | Plug-pull free multi-state USB device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420003402 CN2783391Y (en) | 2004-02-09 | 2004-02-09 | Plug-pull free multi-state USB device |
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| Publication Number | Publication Date |
|---|---|
| CN2783391Y true CN2783391Y (en) | 2006-05-24 |
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ID=36768374
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420003402 Expired - Fee Related CN2783391Y (en) | 2004-02-09 | 2004-02-09 | Plug-pull free multi-state USB device |
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| CN (1) | CN2783391Y (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101515260B (en) * | 2008-02-21 | 2010-12-08 | 扬智科技股份有限公司 | Method for switching device function under condition of not plugging device |
| CN102169469A (en) * | 2011-04-07 | 2011-08-31 | 柴可 | Circuit and method for communication among devices based on USB disk |
| CN102244321A (en) * | 2010-05-14 | 2011-11-16 | 鸿富锦精密工业（深圳）有限公司 | USB (universal serial bus) connection cable |
| CN102411527A (en) * | 2010-09-21 | 2012-04-11 | 北京中星微电子有限公司 | Detecting method for image-processing chip, developing plate and detecting system |
| CN101727411B (en) * | 2008-10-17 | 2012-07-25 | 巴比禄股份有限公司 | Terminal device |
| CN102890662A (en) * | 2012-10-19 | 2013-01-23 | 无锡海森诺科技有限公司 | Method for identifying host operating system by executing enumeration twice on USB (Universal Serial Bus) HID (Human Interface Device) |
| CN103198036A (en) * | 2013-03-26 | 2013-07-10 | 佛山市兴知源数字技术有限公司 | Circuit capable of automatically identifying touch screen and host machine for all-in-one machine |
| CN103440802A (en) * | 2013-08-27 | 2013-12-11 | 无锡泛太科技有限公司 | Comprehensive experiment table of internet of things |
| CN105589781A (en) * | 2014-10-24 | 2016-05-18 | 惠州市德赛西威汽车电子股份有限公司 | Automated testing method of simulating inserting and pulling of USB of car audio |
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2004
- 2004-02-09 CN CN 200420003402 patent/CN2783391Y/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101515260B (en) * | 2008-02-21 | 2010-12-08 | 扬智科技股份有限公司 | Method for switching device function under condition of not plugging device |
| US8645581B2 (en) | 2008-10-17 | 2014-02-04 | Buffalo Inc. | Terminal device |
| CN101727411B (en) * | 2008-10-17 | 2012-07-25 | 巴比禄股份有限公司 | Terminal device |
| CN102244321B (en) * | 2010-05-14 | 2015-04-01 | 中山市云创知识产权服务有限公司 | USB (universal serial bus) connection cable |
| CN102244321A (en) * | 2010-05-14 | 2011-11-16 | 鸿富锦精密工业（深圳）有限公司 | USB (universal serial bus) connection cable |
| CN102411527B (en) * | 2010-09-21 | 2015-01-21 | 北京中星微电子有限公司 | Detecting method for image-processing chip, developing plate and detecting system |
| CN102411527A (en) * | 2010-09-21 | 2012-04-11 | 北京中星微电子有限公司 | Detecting method for image-processing chip, developing plate and detecting system |
| CN102169469A (en) * | 2011-04-07 | 2011-08-31 | 柴可 | Circuit and method for communication among devices based on USB disk |
| CN102890662A (en) * | 2012-10-19 | 2013-01-23 | 无锡海森诺科技有限公司 | Method for identifying host operating system by executing enumeration twice on USB (Universal Serial Bus) HID (Human Interface Device) |
| CN102890662B (en) * | 2012-10-19 | 2016-10-05 | 无锡海森诺科技有限公司 | By USB HID device is carried out the method that secondary enumerates to identify host operating system |
| CN103198036A (en) * | 2013-03-26 | 2013-07-10 | 佛山市兴知源数字技术有限公司 | Circuit capable of automatically identifying touch screen and host machine for all-in-one machine |
| CN103198036B (en) * | 2013-03-26 | 2015-08-05 | 佛山市兴知源数字技术有限公司 | All-in-one touch-screen main frame automatic identification circuit |
| CN103440802A (en) * | 2013-08-27 | 2013-12-11 | 无锡泛太科技有限公司 | Comprehensive experiment table of internet of things |
| CN105589781A (en) * | 2014-10-24 | 2016-05-18 | 惠州市德赛西威汽车电子股份有限公司 | Automated testing method of simulating inserting and pulling of USB of car audio |
| CN105589781B (en) * | 2014-10-24 | 2019-01-22 | 惠州市德赛西威汽车电子股份有限公司 | A kind of vehicle audio simulation USB plug automated testing method |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20060524 Termination date: 20120209 |