CN111522762B - Transmission interface circuit - Google Patents
Transmission interface circuit Download PDFInfo
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- CN111522762B CN111522762B CN201910106633.3A CN201910106633A CN111522762B CN 111522762 B CN111522762 B CN 111522762B CN 201910106633 A CN201910106633 A CN 201910106633A CN 111522762 B CN111522762 B CN 111522762B
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- power
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- electronic device
- data transmission
- interface circuit
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
- G06F13/4081—Live connection to bus, e.g. hot-plugging
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017509—Interface arrangements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017545—Coupling arrangements; Impedance matching circuits
Abstract
The transmission interface circuit comprises a power supply end, a first power path, a first data transmission path, a second power path and a controller. The first power end is coupled to the storage device to provide electric energy to the storage device; the first data transmission path is coupled between the storage device and the electronic device and is used for transmitting data between the storage device and the electronic device; the second power source terminal is coupled to the electronic device for providing power to the electronic device. The controller is used for controlling whether the first power supply path, the second power supply path and the first data transmission path are conducted or not respectively according to the message transmitted by the electronic device.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to a relative application of accessing an external hard disk by a mobile phone, in particular to a control method for charging and executing backup data by the mobile phone.
[ background of the invention ]
Compared with a Personal Computer (PC), the internal storage space of a smart phone is rather limited, and in order to maintain enough space inside the smart phone to continue to retrieve data (such as taking photos, movies, etc.), a user must perform backup from time to move a large amount of data inside the smart phone to a larger external storage space, such as an external hard disk.
In view of capacity and price, hard disk (HDD) or solid state drive (ssd) is still an attractive choice for consumers. In addition, considering a large amount of power consumed by the mobile phone during the backup process, an external hard disk box or similar related products having file transmission and charging functions are currently provided in the market, and the products are powered by a power adapter (adapter) on one side, wherein the external hard disk box and the power adapter, and the external hard disk box and the mobile phone can be connected through USB (or newer USB TYPE-C) transmission lines. Based on cost considerations, a smart phone product is usually purchased without a high-wattage power adapter (e.g., 10 watts (W)), and usually only with a 5W power adapter, but also with a 5W power adapter, which is popular in a common household. When the hard disk is powered on, if the power provided to the hard disk is insufficient, the hard disk is turned on for a short time and then turned off, so that a user cannot successfully back up the hard disk, and the service life of the hard disk is greatly reduced.
In summary, it is an important issue in the art how to provide a novel architecture and related method to solve the above problems.
[ summary of the invention ]
The present invention is directed to a method for controlling a state (such as an electric quantity, a user identity, etc.) of a mobile phone through an Application (APP) of the mobile phone, so that a hard disk external box connected to the mobile phone can selectively enter a charging priority mode or a backup priority mode of the mobile phone when a power supply of a power adapter is insufficient.
An embodiment of the present invention provides a transmission interface circuit for providing transmission between an electronic device and a storage device, the transmission interface circuit including a power supply terminal, a first power path, a first data transmission path, a second power path, and a controller. The power supply terminal is used for coupling a power supply; the first power path is coupled to a first power end, wherein the first power end is used for coupling the storage device to provide electric energy for the storage device; the first data transmission path is coupled between the storage device and the electronic device and is used for transmitting data between the storage device and the electronic device; the second power path is coupled to a second power source terminal, wherein the second power source terminal is used for coupling the electronic device to provide electric energy for the electronic device. The controller is used for controlling whether the first power supply path, the second power supply path and the first data transmission path are conducted or not respectively according to the message transmitted by the electronic device.
An embodiment of the present invention provides a transmission interface circuit for providing transmission between an electronic device and a storage device, the transmission interface circuit including a power supply terminal, a first power path, a first data transmission path, a second power path, and a controller. The power supply terminal is used for coupling a power supply; the first power path is coupled to a first power end, wherein the first power end is used for coupling the storage device to provide electric energy for the storage device; the first data transmission path is coupled between the storage device and the electronic device and is used for transmitting data between the storage device and the electronic device; the second power path is coupled to a second power source terminal, wherein the second power source terminal is used for coupling the electronic device to provide electric energy for the electronic device. The controller is used for controlling whether the first power supply path, the second power supply path and the first data transmission path are conducted or not respectively according to the message transmitted by the electronic device. The electronic device comprises a processor for running an application program, wherein the application program can determine the configuration of a power path and a data path for the transmission interface circuit according to the operation behavior of a user. The controller receives an instruction of the application program of the processor and executes switching action of a power supply path and a data path according to the instruction.
[ description of the drawings ]
FIG. 1A is a flowchart illustrating a method for controlling a computer to execute backup data according to an embodiment of the present invention.
Fig. 1B is a flowchart of a method for controlling charging and executing backup data for a mobile phone according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a charging priority mode according to an embodiment of the invention.
Fig. 3 is a schematic diagram of a backup priority mode according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a transmission interface circuit according to an embodiment of the invention.
[ notation ] to show
100 transmission interface circuit
102 controller
Power _1 first Power supply terminal
Power _2 second Power supply terminal
Power _3 Power supply terminal
Data _1 first Data transmission terminal
Data _2 second Data transmission end
Data _3 third Data transmission terminal
Switch _ A first Switch
Switch _ B second Switch
Switch _ Bus Switch
Path _ AB internal transmission Path
Path _ P1 first Power Path
Path _ P2 second Power Path
Path _ P3 third Power Path
Path _ D1 first data Transmission Path
Path _ D2 second data Transmission Path
120 storage device
130 computer
140 mobile phone
140C application program
150 power supply adapter
[ detailed description ] embodiments
Certain terms are used throughout the description and following claims to refer to particular components. As one of ordinary skill in the art will appreciate, manufacturers may refer to a component by different names. In the present specification and the claims that follow, elements are distinguished not by differences in name but by differences in function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. Also, the term "coupled" is used herein to encompass any direct or indirect electrical connection. Thus, if a first device couples to a second device, that connection may be through a direct electrical connection, or through an indirect electrical connection via other devices and connections.
For convenience of understanding, the present invention is described in terms of "hard disk", "hard disk external box", "mobile phone", etc. in most examples, however, these terms are only for illustrative purposes and are not intended to limit the scope of the present invention. For example, in various embodiments, the "hard disk" may be replaced by a solid state drive, a USB flash drive, or an SDcard, among other devices with storage capabilities. In addition, the "external box" refers to a product including a control chip and a storage device, but the present invention is not limited thereto, and the control chip may be combined with the storage device in other ways, and any method or means that uses the control chip and the storage device together may be regarded as an embodiment of the "external box" mentioned in the present invention. Moreover, the "mobile phone" herein refers to a smart phone, and can be also popularized to various portable electronic devices with a built-in processor.
The problems encountered with the known techniques mentioned above occur mainly due to the fact that: when a conventional external box is connected to a host (a computer or a mobile phone), a controller of the external box immediately starts a storage device (such as a hard disk) to perform read/write operations on the storage device, and this method may have some risks when the host is a mobile device, for example: it is uncertain whether the user identity is legal and whether the mobile phone power is sufficient. According to the invention, the APP corresponding to the external box is installed at the mobile phone end, the instruction of a user and the current mobile phone state are notified to the controller through the APP, and the instruction is used for controlling the storage device to start after the controller confirms that the mobile phone environment is safe and the electric quantity is in a state suitable for transmission.
Referring to fig. 1A and fig. 1B, respectively, fig. 1A is a flowchart illustrating a method for controlling a computer to execute a backup data according to an embodiment of the present invention, and fig. 1B is a flowchart illustrating a method for controlling a mobile phone to charge and execute a backup data according to an embodiment of the present invention. When connecting to a computer, as shown in fig. 1A, a general data transmission is performed. When the external box is connected to the power adapter and the mobile phone, as shown in fig. 1B, the external box controller immediately turns off the storage device (or makes the storage device enter a standby sleep mode or a power saving mode). Or, the external box controller may only make the storage device enter the standby sleep mode and the power saving mode after the mobile phone APP authenticates that the mobile phone is a valid mobile phone (e.g., the user identity is correct). In addition, the external box controller can execute an operation mode according with personal requirements of different users according to the identities of the users, for example, the external box controller can scan whether new data in the mobile phone needs to be backed up or not, and can actively back up the data of the mobile phone without extra operation of the users. In addition, the controller may be a bridge controller (bridge controller), but the invention is not limited thereto.
In an example, before the backup operation is executed, it may be checked whether the power of the mobile phone reaches a certain level (for example, 70% of the total power), and if the power reaches a certain level, the external box controller is notified to start the storage device, and the mobile phone APP starts to write new data into the storage device.
If the user selects the backup new data priority (please refer to fig. 3, which is a schematic diagram of a backup priority mode according to an embodiment of the present invention), the mobile phone APP is executed in the foreground, the APP is forced to notify the external box controller to start the storage device (charging of the mobile phone may be suspended depending on the electric quantity of the mobile phone), before waiting for the preparation of the storage device, the new data to be backed up in the mobile phone is prepared by scanning, and after the preparation of the storage device is completed, the new data can be written into the storage device. And after the backup is finished, the storage device is determined to be closed according to the electric quantity of the mobile phone, and the mobile phone is restarted to charge.
In FIG. 1A, when the external box is connected to the computer, the external box controller immediately activates the storage device in the external box, and responds to the computer inquiry when the storage device is ready. However, in fig. 1B, after the external box is connected to the power supply and the mobile phone, the external box controller does not immediately start the storage device in the external box, and the mobile phone APP controls the external box controller to start or stop the storage device. Or after the mobile phone APP informs the external box controller and the mobile phone of the conditions, the external box controller starts or closes the storage device. The mobile phone APP controls the external box controller to start or close the storage device, and then determines the time to start or close the storage device according to the state of the mobile phone and the charging priority (see fig. 2, which is a schematic diagram of a charging priority mode according to an embodiment of the present invention) or a backup priority policy. Such as: have new data to backup, the cell-phone electric quantity reaches the certain degree, and the user operates APP access storage device, or waits a period of time after, the external box of APP automatic control starts or closes storage device.
In another embodiment of the present invention, if the external box storage device is connected to the power supply first, and the mobile phone is connected to the external box, the storage device (e.g. hard disk) in the external box is not started by itself immediately, but the mobile phone APP starts the storage device in the external box. After the mobile phone APP is triggered by the external device, the external device is confirmed to be a legal storage device, then the internal state of the mobile phone is checked, for example, the identity of a user is confirmed, new data needs to be backed up, the electric quantity of the mobile phone reaches a certain degree, then the external box switch storage device or the mobile phone is informed to charge according to a charging priority or backup priority strategy, and the charging and backup work of the mobile phone is completed in sequence or at the same time in the background.
Please refer to fig. 4, which is a schematic diagram of a transmission interface circuit 100 according to an embodiment of the present invention, and fig. 4 is a specific architecture of the present invention, which is not intended to limit the scope of the present invention. In addition, the architecture of FIG. 4 can be implemented in conjunction with the processes of FIGS. 1-3.
The transmission interface circuit 100 is used for transmitting between an electronic device (which may be a mobile phone 140 or a computer 130) and the storage device 120, and the transmission interface circuit 100 includes a Power supply terminal Power _3, a first Power terminal Power _1, a second Power terminal Power _2, a first Data transmission terminal Data _1, a second Data transmission terminal Data _2, a third Data transmission terminal Data _3, a first Switch _ a, a second Switch _ B, and a Bus Switch _ Bus, where the first Switch _ a and the second Switch _ B are coupled to each other through an internal transmission Path _ AB. The Power supply terminal Power _3 is used for coupling a Power source, and the coupled Power source can be a Power adapter (Power adapter) 150, but is also replaced by a mobile Power source. The electronic device may be a smart phone, a wearable device, a tablet computer (connected to the second Power terminal Power _2 and the second Data transmission terminal Data _2 at this time, as shown in the mobile phone 140), or a larger computer device such as a desktop computer or a notebook computer (connected to the third Power terminal Power _3 and the third Data transmission terminal Data _3 at this time, as shown in the computer 130). In addition, although the transmission interface circuit 100 and the storage device 120 are separate components in the embodiment, in other possible variations of the invention, the two components may be integrated into the same device, for example, an external box.
The third power Path _ P3, the third Data transmission terminal Data _3, and the second Data transmission Path _ D2 are used to realize file transmission between the storage device 120 and the computer 130, wherein the controller 102 can know that the computer is connected instead of the power adapter (power adapter) through the D +/D-signal transmitted from the computer 130. The computer 130 is a desktop computer or a notebook computer, the Power supply terminal Power _3 is coupled between the computer 130 and the first Power Switch _ a, the third Data transmission terminal Data _3 is used for coupling the computer 130, the second Data transmission Path _ D2 is coupled between the third Data transmission terminal Data _3 and the Bus Switch _ Bus, and the third Power Path _ P3 is coupled between the Power supply terminal Power _3 and the first Power Switch _ a. When the computer 130 is connected to the transmission interface circuit 100, the controller 102 turns on the first power Path _ P1, the third power Path _ P3, and the second data transmission Path _ D2, and turns off the first data transmission Path _ D1. It should be noted that the present invention is not limited to include the function of connecting to the computer, i.e. the third Data transmission terminal Data _3 is negligible in other embodiments, and the present invention may also include only the function of connecting to the mobile phone, tablet, etc.
The first Power Path _ P1 is coupled to a first Power terminal Power _1, wherein the first Power terminal Power _1 is used for coupling to the storage device 120 to provide Power for the storage device 120, and the storage device 120 may be, for example, a solid state drive or a USB flash drive, but not limited thereto. The first data transmission Path _ D1 is coupled between the storage device 120 and the electronic device for data transmission between the storage device 120 and the mobile phone 140. In addition, the second power Path _ P2 is used to provide power for the mobile phone 140.
Further, the first Power Path _ P1 is coupled between the first Power Switch _ a and the first Power terminal Power _1, the first Power Switch _ a is used for controlling whether the first Power Path _ P1 is turned on or off, and the first Power terminal Power _1 is used for coupling the storage device 120. The first Data transmitter Data _1 and the second Data transmitter Data _2 are respectively coupled to the storage device 120 and the mobile phone 140. The Bus Switch _ Bus is coupled between the first Data transmission terminal Data _1 and the second Data transmission terminal Data _2 for determining whether the first Data transmission Path _ D1 and the second Data transmission Path _ D2 are turned on or not (normally, only one of the first Data transmission Path _ D1 and the second Data transmission Path _ D2 is turned on). The second Power Path _ P2 is coupled between the second Power Switch _ B and the second Power terminal Power _ 2; the second power Switch _ B is used to control whether the second power Path _ P2 is turned on or off.
An application program (APP)140C installed on the mobile phone 140 transmits a message or a command to the controller 102, and the controller 102 controls the first power Path _ P1, the second power Path _ P2 and the first data transmission Path _ D1 to be turned on or off according to the message transmitted by the electronic apparatus. The message transmitted by the application 140C includes at least one of the battery status and the user mode of the mobile phone 140, wherein the application 140C can periodically transmit the message to the transmission interface circuit 100; alternatively, the controller 102 may actively send a status request to the mobile phone 140, and after the mobile phone 140 receives the status request, a message is generated accordingly, and the application 140C reports the message to the transmission interface circuit 100 (or the controller 102 thereof). If the command is received, the content is the Switch setting of Switch _ A, Switch _ B, and the application 140C determines the Switch setting of Switch _ A, Switch _ B according to the user's operation behavior.
In one embodiment, the controller 102 initially implements a default mode to make the first power Path _ P1 and the first data transmission Path _ D1 non-conductive and to make the second power Path _ P2 conductive. The purpose of this method is to avoid backup failure under unknown conditions or to further reduce the power of the mobile phone under the condition of insufficient power.
In addition, if the APP is not installed at the mobile phone end (i.e. 140C), the controller 102 may disable the first data transmission Path _ D1, so that the mobile phone can only be charged simply after being plugged into the transmission interface circuit 100. The application 140C may monitor the power of the phone at any time, wherein the power monitoring process may be actively performed by the application 140C, or the controller 102 may send a request to the application 140C to request the application 140C to perform. When the power state of the phone 140 is below a predetermined power level (e.g., 70% of the total power level, but not limited thereto), the application 140C maintains the default mode. In another case, when the power state of the mobile phone 140 is higher than the predetermined power, the application 140C disables the default mode and performs the following operations: under the control of the controller 102, while the second power Switch _ B is maintained, the first power Switch _ a and the Bus Switch _ Bus are enabled to simultaneously supply power to the storage device 120 and perform data transmission between the mobile phone 140 and the storage device 120. If the power state of the mobile phone 140 is lower than another predetermined power (wherein the another predetermined power is lower than the aforementioned predetermined power, and the another predetermined power may be 65% of the total power, for example), the first power Switch _ a and the Bus Switch _ Bus are disabled to stop supplying power to the storage device 120. The above setting of the power loss interval to 65% -70% can prevent the hard disk device from being damaged due to the frequent turning on or off of the storage device 120. For example, if the power loss interval is set to 69% to 70%, the above-mentioned doubt may occur.
When the user mode is the charging priority mode (refer to the embodiment of fig. 2), the controller 102 performs the following operations: the first power Path _ P1 and the first data transmission Path _ D1 are made non-conductive, and the second power Path _ P2 is made conductive. However, even in the charging-priority mode, the transmission interface circuit 100 can still allow for data backup, for example, the application 140C can monitor the power state of the mobile phone 140 in the charging-priority mode, and if the power state of the mobile phone 140 is higher than a predetermined power (e.g. 70% of the total power), the application 140C performs the following operations: under the control of the controller 102, the first power supply Path _ P1 and the first data transmission Path _ D1 are switched from non-conduction to conduction while maintaining the second power supply Path _ P2 in conduction.
When the user mode is the backup priority mode (refer to the embodiment of fig. 3), the application 140C performs the following operations: the controller 102 controls the first power Path _ P1 and the first data transmission Path _ D1 to be conductive, and the second power Path _ P2 to be non-conductive.
In summary, the embodiments of the present invention can achieve proper control between charging the mobile phone and backup of the file, and determine to execute the charging priority mode or the backup priority mode according to the actual situation of the mobile phone and the operation behavior of the user, thereby greatly improving the user experience. In addition, the external box controller of the invention can adopt an optimized charging backup management scheme according to the user mode, the battery power and other information reported by the APP.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (15)
1. A transmission interface circuit for providing transmission between an electronic device and a storage device, the transmission interface circuit comprising:
a power supply terminal for coupling a power source;
a first power path coupled to a first power source terminal, wherein the first power source terminal is configured to couple to the storage device to provide power to the storage device;
a first data transmission path, coupled between the storage device and the electronic device, for performing data transmission between the storage device and the electronic device;
a second power path coupled to a second power source terminal, wherein the second power source terminal is used for coupling to the electronic device to provide power for the electronic device; and
a controller for controlling the conduction of the first power path, the second power path and the first data transmission path according to the message transmitted by the electronic device;
the message includes at least one of a power state of the electronic device and a user mode, wherein the user mode includes a charging priority mode and a backup priority mode.
2. The transmission interface circuit of claim 1, wherein the power source coupled to the power supply is a power adapter (power adapter) or a mobile power source.
3. The transmission interface circuit of claim 1, wherein the electronic device is a smart phone, a wearable device, a tablet computer, a desktop computer, or a notebook computer.
4. The transport interface circuit of claim 1 wherein the message from the electronic device is provided by an application installed on the electronic device corresponding to the transport interface circuit.
5. The transmission interface circuit of claim 4, wherein:
the application program periodically transmits the message to the transmission interface circuit; or
The controller actively transmits a status request to the electronic device, generates the message after the electronic device receives the status request, and reports the message to the controller by the application program.
6. The transmission interface circuit of claim 1, further comprising:
a first power switch (A) and a first power end, wherein the first power path is coupled between the first power switch and the first power end, the first power switch is used for controlling the conduction of the first power path, and the first power end is used for coupling the storage device;
a first data transmission terminal and a second data transmission terminal respectively coupled to the storage device and the electronic device;
a bus switch coupled between the first data transmission end, the second data transmission end and the third data transmission end for determining whether at least the first data transmission path or the second data transmission path is conducted or not; and
a second power switch (B) and a second power terminal, the second power path being coupled between the second power switch and the second power terminal; the second power switch is used for controlling the conduction of the second power path, and the second power end is used for being coupled with the electronic device.
7. The transmission interface circuit of claim 6, further comprising a third power path, a third data transmission terminal, and a second data transmission path; the electronic device is a desktop computer or a notebook computer, the power supply end is coupled between the electronic device and the first power switch, the third data transmission end is used for being coupled with the electronic device, the second data transmission path is coupled between the third data transmission end and the bus switch, and the third power path is coupled between the power supply end and the first power switch; and when the electronic device is connected with the transmission interface circuit, the controller enables the first power supply path, the third power supply path and the second data transmission path to be conducted, and enables the first data transmission path to be non-conducted.
8. The transmission interface circuit of claim 6, wherein the controller initially implements a default mode to render the first power path and the first data transmission path non-conductive and to render the second power path conductive.
9. The transmission interface circuit of claim 8, wherein the controller maintains the default mode when the power state of the electronic device is below a first predetermined power level.
10. The transmission interface circuit of claim 8, wherein the controller disables the default mode when the power state of the electronic device is higher than a first predetermined power level, and performs the following operations:
and enabling the first power switch and the bus switch under the condition of maintaining the second power switch so as to simultaneously supply power to the storage device and perform data transmission between the electronic device and the storage device.
11. The transmission interface circuit of claim 10, wherein the first power switch and the bus switch are disabled to stop power supply to the storage device when the power state of the electronic device is lower than a second predetermined power, wherein the second predetermined power is lower than the first predetermined power.
12. The transmission interface circuit of claim 1, wherein when the user mode is the charging priority mode, the controller performs the following operations:
the first power path and the first data transmission path are made non-conductive, and the second power path is made conductive.
13. The transmission interface circuit of claim 12, wherein the controller monitors the power state of the electronic device in the charging-priority mode, and if the power state of the electronic device is higher than a first predetermined power level, the controller performs the following operations:
and under the condition of maintaining the second power supply path to be conductive, the first power supply path and the first data transmission path are switched from non-conduction to conduction.
14. The transmission interface circuit of claim 1, wherein when the user mode is the backup priority mode, the controller performs the following operations:
the first power path and the first data transmission path are conducted, and the second power path is non-conducted.
15. A transmission interface circuit for providing transmission between an electronic device and a storage device, the transmission interface circuit comprising:
a power supply terminal for coupling a power source;
a first power path coupled to a first power source terminal, wherein the first power source terminal is configured to couple to the storage device to provide power to the storage device;
a first data transmission path, coupled between the storage device and the electronic device, for performing data transmission between the storage device and the electronic device;
a second power path coupled to a second power source terminal, wherein the second power source terminal is used for coupling to the electronic device to provide power for the electronic device; and
a controller for controlling the conduction of the first power path, the second power path and the first data transmission path according to the message transmitted by the electronic device;
the electronic device comprises a processor, a transmission interface circuit and a control circuit, wherein the processor is used for running an application program, and the application program can determine the configuration of a power path and a data path of the transmission interface circuit according to the operation behavior of a user; and the controller receives the instruction of the application program of the processor and executes the action related to the switching of the power supply path and the data path according to the instruction.
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| CN201910106633.3A CN111522762B (en) | 2019-02-02 | 2019-02-02 | Transmission interface circuit |
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| CN201910106633.3A CN111522762B (en) | 2019-02-02 | 2019-02-02 | Transmission interface circuit |
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| CN111522762B true CN111522762B (en) | 2022-03-29 |
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| EP3591854B1 (en) * | 2017-04-07 | 2022-07-13 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Data transmission method, and sending end device |
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| CN107533529A (en) * | 2015-04-28 | 2018-01-02 | 密克罗奇普技术公司 | USB intelligent HUB |
| CN108009108A (en) * | 2016-09-06 | 2018-05-08 | 德尔福技术有限公司 | Flexible mobile equipment and the connection of the automotive system with usb hub |
| CN207965750U (en) * | 2018-03-28 | 2018-10-12 | 深圳市四季宏胜科技有限公司 | A kind of smart machine accesses the device of external storage by direct-connected mode |
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