CN1438582A - USB control circuit suitable to computer-to-computer transmission and its operation method - Google Patents
USB control circuit suitable to computer-to-computer transmission and its operation method Download PDFInfo
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- CN1438582A CN1438582A CN 03102628 CN03102628A CN1438582A CN 1438582 A CN1438582 A CN 1438582A CN 03102628 CN03102628 CN 03102628 CN 03102628 A CN03102628 A CN 03102628A CN 1438582 A CN1438582 A CN 1438582A
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Abstract
The USB control circuit suitable to the transmission between computers comprises following components: the host controller provides the USB interface of the host functions; the functions circuits provide the functions of the USB interface device and the transmission function for connecting to other hosts; at least one device containing a group of connection ports for signal lines and the route switch set. The route switch set and switch the connection routes between the host controller and the functional circuits. Thus, the data transmission can be carried out in the host mode connectnig to USB devices or in the device function mode connecting to other computer host.
Description
Technical field
The present invention relates to a kind of USB control circuit and operational method thereof, particularly a kind of USB control circuit and operational method thereof that is applicable to computer to the computer transmission.
Background technology
Because USB (Universal Serial Bus) interface specification has plug and play (Plug-And-Play; Can contact PNP), at most 127 USB devices, the electric power of 5V can be provided, and only need take an advantage such as IRQ, and be subjected to liking of numerous users.Nearly all computer all has the USB of support transmission interface now, adds the USB2.0 specification of succeeding in developing recently, makes its transfer rate rise to the high speed of 480Mbps at one stroke.Convenient and transfer rate at a high speed because of it makes manufacturer that the USB interface specification is applied on increasing computer peripheral outfit and other information products.
In the past, computer can only pass through the networking to the transmission of computer, or utilized the printing port of computer itself to connect and do the data transmission.Yet general networking is with all very slow by the transfer rate of printing the port, and two computers of still needing by the networking all are equipped with the networking card just for feasible.So there is manufacturer to propose to utilize the USB interface to carry out the notion of computer to the data transmission of computer.
Because the USB interface is a client/server (master/slave system), needing provides host function (host) and periphery outfit generator function (device) by computer, just can carry out the data transmission between computer and peripheral the outfit.
The solution of part manufacturer is as shown in Figure 1, and it mainly is to utilize a bridge 16 as the bridge of linking up between computer 12 and the computer 18.Can utilize the console controller (host controller) 123 and bridge 16 of a USB connecting line 141 connection computers 12, connect the console controller 183 of bridge devices 16 and computer 18 again with another USB connecting line 143.Provide host function by each console controller, this bridge 16 is the generator function then, carries out the communication of two ends main frame, so, can utilize the USB interface to carry out the data transmission of computer to computer.
Though can reaching, above-mentioned solution utilize the USB interface to carry out the purpose of computer to the computer transmission, when yet it is implemented, need to prepare a bridge and two USB connecting lines, in using and carry the different inconvenience that is, and bridge and USB connecting line need to buy in addition, also can increase user's overhead.
In addition, at present existing manufacturer integrates above-mentioned bridge chip and USB connecting line, formation one has the USB connecting line of bridging functionality, but because of wherein including the bridge chip, so required expense is higher, and can only power uses that be connected between brain and computer of the connecting line of this tool bridging functionality, general USB device connected as if desire, still need use general USB connecting line, go up real very inconvenience in using.
Therefore, how at the shortcoming of the above-mentioned transmission plan of commonly using, and about problem takes place and proposes a kind of novel solution in institute when using, design a kind of convenient and practical USB interface transmission architecture, not only can effectively carry out the transmission of computer to computer, need not additionally to purchase outfit again, be not to use for a long time the person eagerly to look forward to and difficulty place that human desires row of the present invention solves always, and the inventor is based on the correlative study of engaging in IT industry for many years, exploitation, and the practical experience of selling, it is the idea of thinking and improveing, through design in many ways, inquire into, after studying sample and improvement, finally work out a kind of USB control circuit and operational method thereof that is applicable to computer to the computer transmission, to solve the above problems.
Summary of the invention
Technical matters to be solved by this invention is, above-mentioned deficiency at prior art, and a kind of host function and apparatus function that makes computer possess the USB interface be provided, can be respectively be applicable to USB control circuit and the operational method thereof of computer to the computer transmission with USB device and other host computers carry out the data transmission.
The computer that is applicable to provided by the present invention is realized by following technical scheme the USB control circuit of computer transmission.
A kind of USB control circuit that is applicable to computer to the computer transmission is characterized in that:
One console controller is in order to provide the host function of USB interface;
One apparatus function circuit is in order to provide the apparatus function of USB interface, for being connected with other main frames;
At least one Port, each Port include one group of signal line D+ and D-, in order to connect USB device and USB connecting line, use data transmission;
One path switching device connects console controller, apparatus function circuit and this group signal line respectively, and the access path of this group signal line is switched between this console controller and apparatus function circuit;
One power supply transfer line, this power supply transfer line is provided with a power switching device, and the one end connects the power lead on the motherboard, and the other end is then in order to connect USB device and USB connecting line; And
Drag switch device on one pull-up resistor and, this pull-up resistor and should go up drag switch device polyphone and cross-over connection between this power supply transfer line and signal line D+.
Except that above-mentioned essential features, in specific implementation process, also can replenish following technology contents:
This path switching device is a multiplexer.
When the access path of this path switching device was console controller, this power switching device was conducting, and this derailing switch is for opening circuit.
When the access path of this path switching device was the apparatus function circuit, this power switching device was for opening circuit, and this derailing switch is conducting.
Still include the pull-up resistor of one group of serial connection and go up the drag switch device, cross-over connection is between this power supply transfer line and signal line D-.
The USB control circuit that is applicable to that computer transmits computer provided by the present invention also can be realized by following another technical scheme.
A kind of USB control circuit that is applicable to computer to the computer transmission is characterized in that:
One console controller is in order to provide the host function of USB interface;
One apparatus function circuit is in order to provide the apparatus function of USB interface, for being connected with other main frames;
At least one Port, each Port include one group of signal line D+, D-and a power supply switch controller, and this group signal line D+, D-can use data transmission in order to connect USB device and USB connecting line; And
One path switching device connects console controller, apparatus function circuit and this group signal line respectively, the access path of this group signal line can be switched between this console controller and apparatus function circuit;
In addition, still include the power switching device of being located at the mainboard power supply line, be connected to this power supply switch controller, open the output signal of controller and conducting and opening circuit according to this power supply.
This another technical scheme, except that above-mentioned essential features, in specific implementation process, also can replenish following technology contents:
Still include the pull-up resistor of one group of serial connection and go up the drag switch device, the one end connects signal line D+, and the other end connects the input end of this power supply switch controller and the power lead on this motherboard.
The present invention also provides a kind of described operational method that is applicable to computer to the USB control circuit of computer transmission that is used in,
A kind ofly be used in the described operational method that is applicable to computer to the USB control circuit of computer transmission, it is characterized in that including the following step:
It is each preset mode of this control circuit that one host mode is provided;
Detect this Port whether in using;
If, then transmit with this host mode, promptly its path switching device is connected to console controller with signal line D+ and D-, and this power switching device is conducting, and drag switch device is for opening circuit on this;
If not, this control circuit is switched to an apparatus function pattern, promptly its path switching device is connected to the apparatus function circuit with signal line D+ and D-, and this power switching device is for opening circuit, and drag switch device is conducting on this.
This is used in the above-mentioned operational method that is applicable to computer to the USB control circuit of computer transmission, in specific implementation process, also can replenish following technology contents:
Still include the following step:
One time spacing is provided;
Whether detecting connects sets up;
If transmit with the apparatus function pattern;
If not, then wait for whether in this time interval, connecting;
If connect, then transmit with the apparatus function pattern in this time interval;
If do not connect, then this control circuit is switched to host mode in this time interval.
Still include the following step:
Whether detecting connects sets up;
If transmit with host mode;
If not, then wait for whether in this time interval, connecting;
If then still transmit with host mode;
If not, then control circuit is switched to the apparatus function pattern, the detecting of proceeding to connect, and form a round-robin flow process.
The invention provides a kind of USB control circuit that is applicable to computer to the computer transmission, it mainly includes: a console controller, in order to the host function of USB interface to be provided; One apparatus function circuit, in order to the apparatus function of USB interface to be provided, can be for being connected with other main frames; At least one Port, each Port include one group of signal line D+ and D-, can use data transmission in order to connect USB device and USB connecting line; And a path switching device, connect console controller, apparatus function circuit and this group signal line respectively, the access path of this group signal line can be switched between this console controller and apparatus function circuit.
In addition, the present invention still provides an operational method that can apply to above-mentioned USB control circuit, and its main implementation step is to include: the preset mode of a host mode for this control circuit is provided; Detect this Port whether in using; If then transmit with this host mode; If not, this control circuit is switched to an apparatus function pattern.
The invention has the advantages that:
1, a kind of USB control circuit that is applicable to computer to the computer transmission provided by the present invention, it mainly is to set up an apparatus function circuit in the USB of computer control circuit, use the apparatus function that the USB interface is provided, can be in order to be connected and data transmission with other computers.
2, a kind of USB control circuit that is applicable to computer to the computer transmission provided by the present invention, be provided with a path switching device in its USB control circuit, the path that connects can be switched between console controller and apparatus function circuit mutually, using provides host function and apparatus function, can connect peripheral device and other computers respectively and carry out the data transmission.
3, a kind of USB control circuit that is applicable to computer to the computer transmission provided by the present invention, its control circuit still is provided with drag switch device on a power switching device, the pull-up resistor and, conducting or open circuit in the time of can be respectively at host mode and apparatus function pattern is with the convenient detecting that is connected with peripheral device or other computers.
4, a kind of operational method that is applicable to computer to the USB control circuit of computer transmission provided by the present invention, it mainly is can select to carry out the switching of host mode and apparatus function pattern in wherein a kind of mode of user setting and Auto-Sensing.
5, a kind of operational method that is applicable to computer to the USB control circuit of computer transmission provided by the present invention, can utilize a default time interval as etc. the foundation of whether overtime to be connected, if etc. overtime to be connected, then switching another mode detecting connects, can between host mode and apparatus function pattern, switch automatically, use and select appropriate mode to carry out the data transmission.
For feature of the present invention, structure and the effect reached are had further understanding and understanding, careful assistant describes in detail as the back with preferred embodiment and conjunction with figs.:
Description of drawings
Fig. 1: be that the known USB of utilization interface carries out the synoptic diagram of computer to the computer transmission.
Fig. 2: the circuit block diagram that is a preferred embodiment of the present invention.
Fig. 3: the circuit block diagram that is another embodiment of the present invention.And
Fig. 4: the process flow diagram that is operational method of the present invention.
Embodiment
At first, seeing also Fig. 2, is the circuit block diagram of a preferred embodiment of the present invention.As shown in the figure, in its control chip 20, mainly be console controller (host controller) 22, one apparatus function circuit (device function circuit) 24 and one path switching device 26 that includes a USB interface, 25 of its Ports (port) include one group of signal line (signal line D+253 and signal line D-255) in order to do the transmission of data.Wherein, this path switching device 26 connects signal line D+253 and the signal line D-255 in console controller 22, apparatus function circuit 24 and the Port 25 respectively, the access path of Port 25 can be switched mutually in console controller 22 and 24 in apparatus function circuit, use host function (host) and apparatus function (device) that the USB interface is provided according to user demand.
Be provided with a power supply transfer line 251 in the Port 25 in addition, this power supply transfer line 251 is provided with a power switching device 28.Utilize in addition cross-over connection of one group of pull-up resistor that is connected in series (pull-up-resistor) 291 and last drag switch device 293 between power supply transfer line 251 and the signal line D+.Wherein, this power supply transfer line 251 is in order to connect the USB power lead 231 that motherboard provided, use the power supply that USB is provided, can make up with the ground wire 233 on signal line D+253, signal line D-255 and the motherboard, and supply the USB transmission interface to connect the usefulness of peripheral USB device or other computers.
Wherein, when path switching device 26 switched to console controller 22 with the access path of Port 25, this power switching device 28 was to be conducting, and went up drag switch device 293 for opening circuit, the host function of USB interface can be provided, can be connected with general peripheral USB device and carry out data transmission.When if path switching device 26 switches to apparatus function circuit 24 with the access path of Port 25, then power switching device 28 is conducting for opening circuit and go up drag switch device 293, and the apparatus function of USB interface can be provided, can connect other computers, use and carry out the data transmission of computer computer.
Secondly, seeing also Fig. 3, is the circuit block diagram of another embodiment of the present invention.As shown in the figure, it is mainly constructed roughly with embodiment illustrated in fig. 2 identical, and its power switching device 385 is on the USB power lead of being located on the motherboard 231.Then be provided with a power supply switch controller 38 in the Port 25, its input end connects pull-up resistor 291 and power lead 231 in order to be connected an end of USB device or other computers, output terminal then connects this power switching device 385, use control power switching device 385 conducting with open circuit.
Path switching device 26 in the present embodiment is multiplexers, and this power switching device and last drag switch device 293 all can be implemented by transistor.
At last, seeing also Fig. 4, is the process flow diagram of operational method one preferred embodiment of the present invention.Operational method of the present invention is to select to be specified or switched by the system automatic detecting dual mode by the user access path of Port.The user specifies, and the person of being to use complies with it and desires the connectionist specifies this path switching device for peripheral device or other computers access path.
The work flow of system automatic detecting mode then as shown in Figure 3.It mainly is that earlier to set its default transmission mode be host mode, that is path switching device is connected to console controller with Port, and power switching device conducting and go up the drag switch device and open circuit is the host function 301 that general computer provides.Whether the detecting Port is in using 303 in host mode; If then keep host mode and carry out data transmission 343 with peripheral device; If not, then switch to apparatus function mode 3 05, promptly path switching device switches to the apparatus function circuit with the access path of Port, and power switching device is conducting and go up the drag switch device for opening circuit, and uses the apparatus function that the USB interface is provided.
Detecting connects whether set up 307 in the apparatus function pattern; If then the form that can install and far-end computer carry out general USB linker, program is finished the transmission 327 that can carry out data; If not, then wait for a default time interval, and continue the situation that detecting connects, whether wait the situation 309 of overtime; If not, be shown in waiting period and connect, can the apparatus function pattern be connected and data transmission 327 with far-end computer; If wait overtime, then control circuit is switched to host mode 311.
Same, detecting connects whether set up 313 under host mode; If, then can host mode and peripheral device carry out the transmission 343 of data; If not, then wait for a default time interval, and continue the situation that detecting connects, whether wait the situation 315 of overtime; If not, be shown in waiting period and connect, can be connected and data transmission 343 with peripheral USB device by host mode; If wait overtime, then carry out step 305 and again control circuit is switched to the apparatus function pattern and detect, form round-robin detecting flow process.
Wherein, above-mentioned Preset Time spacing can be selected voluntarily to set according to user's demand.When system during at host mode, the detecting of its connection is as good as with the operation of general computer.
In addition, though the above embodiments all with USB2.0 interface specification (high speed USB; High speed) full speed (full speed) specification with the USB1.1 interface is main, the right also applicable control circuit of the present invention of low speed (low speed) specification, only pull-up resistor that another group need be connected in series and the cross-over connection of last drag switch device are between power supply transfer line 251 and signal line D-255, utilize software or a piece of wood serving as a brake to halt a carriage spare to control the conducting of its derailing switch or open circuit again, can reach same effect.
By above-mentioned flow process, can utilize control circuit of the present invention, its connectionist of Auto-Sensing is USB peripheral device or other computers, and provides the host function or the apparatus function of corresponding USB interface according to the object of its connection, carries out the transmission of data and can finish smoothly to connect.
In sum, the invention relates to a kind of USB control circuit and operational method thereof when knowing, especially refer to a kind of USB control circuit and operational method thereof that is applicable to computer to the computer transmission, it mainly is to set up an apparatus function circuit and a path switching device in the USB of computer control circuit, make this computer possess the host function and the apparatus function of USB interface, can carry out the data transmission with USB device and other host computers respectively.So the present invention one is rich in novelty, progressive, and can utilize effect for industry, meet the patented claim important document undoubtedly, the whence is submitted application for a patent for invention in accordance with the law.
But the above, it only is a preferred embodiment of the present invention, be not to be used for limiting scope of the invention process, promptly all equalizations of doing according to the described shape of the present patent application claim, structure, feature, spirit and method change and modify, and all should be included in the claim of the present invention.
Claims (10)
1, a kind of USB control circuit that is applicable to computer to the computer transmission is characterized in that:
One console controller is in order to provide the host function of USB interface;
One apparatus function circuit is in order to provide the apparatus function of USB interface, for being connected with other main frames;
At least one Port, each Port include one group of signal line D+ and D-, in order to connect USB device and USB connecting line, use data transmission;
One path switching device connects console controller, apparatus function circuit and this group signal line respectively, and the access path of this group signal line is switched between this console controller and apparatus function circuit;
One power supply transfer line, this power supply transfer line is provided with a power switching device, and the one end connects the power lead on the motherboard, and the other end is then in order to connect USB device and USB connecting line; And
Drag switch device on one pull-up resistor and, this pull-up resistor and should go up drag switch device polyphone and cross-over connection between this power supply transfer line and signal line D+.
2, the USB control circuit that is applicable to computer to the computer transmission according to claim 1, it is characterized in that: this path switching device is a multiplexer.
3, the USB control circuit that is applicable to computer to the computer transmission according to claim 1, it is characterized in that: when the access path of this path switching device was console controller, this power switching device was conducting, and this derailing switch is for opening circuit.
4, the USB control circuit that is applicable to computer to computer transmission according to claim 1 is characterized in that: when the access path of this path switching device was the apparatus function circuit, this power switching device was for opening circuit, and this derailing switch is conducting.
5, the USB control circuit that is applicable to computer to the computer transmission according to claim 1 is characterized in that: still include the pull-up resistor of one group of serial connection and go up the drag switch device, cross-over connection is between this power supply transfer line and signal line D-.
6, a kind of USB control circuit that is applicable to computer to the computer transmission is characterized in that:
One console controller is in order to provide the host function of USB interface;
One apparatus function circuit is in order to provide the apparatus function of USB interface, for being connected with other main frames;
At least one Port, each Port include one group of signal line D+, D-, with a power supply switch controller, this group signal line D+, D-use data transmission in order to connect USB device and USB connecting line; And
One path switching device connects console controller, apparatus function circuit and this group signal line respectively, the access path of this group signal line can be switched between this console controller and apparatus function circuit;
In addition, still include the power switching device of being located at the mainboard power supply line, be connected to this power supply switch controller, conducting and opening circuit according to the output signal of this power supply switch controller.
7, the USB control circuit that is applicable to computer to the computer transmission according to claim 6, it is characterized in that: still include the pull-up resistor of one group of serial connection and go up the drag switch device, the one end connects signal line D+, and the other end connects the input end of this power supply switch controller and the power lead on this motherboard.
8, a kind of described operational method that is applicable to computer to the USB control circuit of computer transmission of claim 1 that is used in is characterized in that including the following step:
It is each preset mode of this control circuit that one host mode is provided;
Detect this Port whether in using;
If, then transmit with this host mode, promptly its path switching device is connected to console controller with signal line D+ and D-, and this power switching device is conducting, and drag switch device is for opening circuit on this;
If not, this control circuit is switched to an apparatus function pattern, promptly its path switching device is connected to the apparatus function circuit with signal line D+ and D-, and this power switching device is for opening circuit, and drag switch device is conducting on this.
9, the operational method that is applicable to computer to the USB control circuit of computer transmission according to claim 8 is characterized in that still including the following step:
One time spacing is provided;
Whether detecting connects sets up;
If transmit with the apparatus function pattern;
If not, then wait for whether in this time interval, connecting;
If connect, then transmit with the apparatus function pattern in this time interval;
If do not connect, then this control circuit is switched to host mode in this time interval.
10, the operational method that is applicable to computer to the USB control circuit of computer transmission according to claim 9 is characterized in that still including the following step:
Whether detecting connects sets up;
If transmit with host mode;
If not, then wait for whether in this time interval, connecting;
If then still transmit with host mode;
If not, then control circuit is switched to the apparatus function pattern, the detecting of proceeding to connect, and form a round-robin flow process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031026281A CN1316388C (en) | 2003-02-12 | 2003-02-12 | USB control circuit suitable to computer-to-computer transmission and its operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031026281A CN1316388C (en) | 2003-02-12 | 2003-02-12 | USB control circuit suitable to computer-to-computer transmission and its operation method |
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| Publication Number | Publication Date |
|---|---|
| CN1438582A true CN1438582A (en) | 2003-08-27 |
| CN1316388C CN1316388C (en) | 2007-05-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031026281A Expired - Lifetime CN1316388C (en) | 2003-02-12 | 2003-02-12 | USB control circuit suitable to computer-to-computer transmission and its operation method |
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| CN (1) | CN1316388C (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7185132B2 (en) | 2004-09-17 | 2007-02-27 | Via Technologies, Inc. | USB controller with intelligent transmission mode switching function and the operating method thereof |
| CN100338594C (en) * | 2004-09-30 | 2007-09-19 | 威盛电子股份有限公司 | USB control circuit having host mode and controlled mode switching function and its method |
| CN100354800C (en) * | 2004-06-15 | 2007-12-12 | 英业达股份有限公司 | Data accessing system and method |
| US7536497B2 (en) | 2005-06-16 | 2009-05-19 | Samsung Electronics Co., Ltd. | Device and method for performing multi-function using unique port in wireless terminal |
| CN101833526B (en) * | 2009-03-10 | 2012-05-23 | 宏达国际电子股份有限公司 | Electronic system and method for supporting host function |
| CN102841877A (en) * | 2012-07-05 | 2012-12-26 | 深圳芯邦科技股份有限公司 | Detecting method and automatic detecting circuit of working mode |
| CN103139031A (en) * | 2011-12-02 | 2013-06-05 | 亚旭电子科技(江苏)有限公司 | Universal serial bus (USB) front-arrangement judging circuit |
| CN103164355A (en) * | 2011-12-13 | 2013-06-19 | 联想(北京)有限公司 | Switch method and electronic equipment |
| CN106299905A (en) * | 2016-08-31 | 2017-01-04 | 无锡信欧光电科技有限公司 | A kind of optical-mechanical-electrical switching equipment |
| CN110837271A (en) * | 2018-08-15 | 2020-02-25 | 东硕资讯股份有限公司 | Expansion device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101897610B1 (en) * | 2011-10-21 | 2018-09-12 | 삼성전자 주식회사 | Portable terminal and method for sharing component thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1273903C (en) * | 1998-03-19 | 2006-09-06 | 韩旭 | General purpose serial bus multifunctional changeover controller |
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2003
- 2003-02-12 CN CNB031026281A patent/CN1316388C/en not_active Expired - Lifetime
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100354800C (en) * | 2004-06-15 | 2007-12-12 | 英业达股份有限公司 | Data accessing system and method |
| US7185132B2 (en) | 2004-09-17 | 2007-02-27 | Via Technologies, Inc. | USB controller with intelligent transmission mode switching function and the operating method thereof |
| CN100338594C (en) * | 2004-09-30 | 2007-09-19 | 威盛电子股份有限公司 | USB control circuit having host mode and controlled mode switching function and its method |
| US7536497B2 (en) | 2005-06-16 | 2009-05-19 | Samsung Electronics Co., Ltd. | Device and method for performing multi-function using unique port in wireless terminal |
| CN101833526B (en) * | 2009-03-10 | 2012-05-23 | 宏达国际电子股份有限公司 | Electronic system and method for supporting host function |
| CN103139031A (en) * | 2011-12-02 | 2013-06-05 | 亚旭电子科技(江苏)有限公司 | Universal serial bus (USB) front-arrangement judging circuit |
| CN103164355A (en) * | 2011-12-13 | 2013-06-19 | 联想(北京)有限公司 | Switch method and electronic equipment |
| CN103164355B (en) * | 2011-12-13 | 2015-09-23 | 联想(北京)有限公司 | A kind of changing method and electronic equipment |
| CN102841877A (en) * | 2012-07-05 | 2012-12-26 | 深圳芯邦科技股份有限公司 | Detecting method and automatic detecting circuit of working mode |
| CN102841877B (en) * | 2012-07-05 | 2015-05-06 | 深圳芯邦科技股份有限公司 | Detecting method and automatic detecting circuit of working mode |
| CN106299905A (en) * | 2016-08-31 | 2017-01-04 | 无锡信欧光电科技有限公司 | A kind of optical-mechanical-electrical switching equipment |
| CN106299905B (en) * | 2016-08-31 | 2018-11-16 | 无锡信欧光电科技有限公司 | A kind of optical-mechanical-electrical switching equipment |
| CN110837271A (en) * | 2018-08-15 | 2020-02-25 | 东硕资讯股份有限公司 | Expansion device |
| CN110837271B (en) * | 2018-08-15 | 2023-12-05 | 东硕资讯股份有限公司 | expansion device |
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| Publication number | Publication date |
|---|---|
| CN1316388C (en) | 2007-05-16 |
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