CN108519892B - Start mode selection circuit and electronic equipment - Google Patents
Start mode selection circuit and electronic equipment Download PDFInfo
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- CN108519892B CN108519892B CN201810259511.3A CN201810259511A CN108519892B CN 108519892 B CN108519892 B CN 108519892B CN 201810259511 A CN201810259511 A CN 201810259511A CN 108519892 B CN108519892 B CN 108519892B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/4401—Bootstrapping
- G06F9/4418—Suspend and resume; Hibernate and awake
Abstract
The present invention relates to a start mode selection circuit and an electronic device, including: the switch control module, the mode selection circuit, the interface circuit and the mode control circuit; the switch control module is connected with the mode control circuit through the mode selection circuit; the output end of the interface circuit is connected with the mode control circuit, and the input end of the interface circuit is used for accessing a digital interface of the computer equipment; when the input end of the interface circuit is connected or not connected with the digital interface of the computer equipment, the interface circuit outputs a corresponding interface signal to the mode control circuit; the mode control circuit outputs a mode control signal according to the mode selection signal and the corresponding interface signal, wherein the mode control signal is used for indicating the electronic equipment adopting the starting mode selection circuit to start a recovery mode or a normal starting mode. The starting mode selection circuit can enable the electronic equipment to select to enter a recovery mode or a normal starting mode, and is very simple in structure and convenient to operate.
Description
Technical Field
The present invention relates to the field of intelligent hardware devices of electronic devices, and in particular, to a start mode selection circuit and an electronic device.
Background
The electronic device usually has a Recovery mode, and a user can perform a series of settings on the electronic device through the Recovery mode during using the electronic device, such as factory reset, system switch, system update (i.e. system upgrade). At present, the common modes for entering the recovery mode are generally divided into two modes, one mode is that when the electronic device is in the power-off state, a main screen key, a power key and a volume key (namely, a multi-key combination pressing mode) are pressed simultaneously, so that the electronic device enters the recovery mode, and the operation is very inconvenient; the other is to enter the electronic device into a recovery mode by pressing a specific recovery key arranged on the electronic device, however, in order to avoid the misoperation of the user, the recovery key is usually arranged at a hidden position, and the recovery key function can be started only by a special tool, which is inconvenient to operate.
Disclosure of Invention
Therefore, it is necessary to provide a start mode selection circuit for solving the problem of inconvenient operation of the conventional recovery mode start mode.
A start-up mode selection circuit comprising: the switch control module, the mode selection circuit, the interface circuit and the mode control circuit;
the switch control module is connected with the mode control circuit through the mode selection circuit; the output end of the interface circuit is connected with the mode control circuit, the input end of the interface circuit is used for accessing a digital interface of computer equipment, and when the input end of the interface circuit is accessed to the digital interface of the computer equipment, the computer equipment supplies power to the interface circuit;
the mode selection circuit outputs a mode selection signal to the mode control circuit according to a switch control signal of the switch control module;
when the input end of the interface circuit is connected or not connected with the digital interface of the computer equipment, the interface circuit outputs a corresponding interface signal to the mode control circuit;
the mode control circuit outputs a mode control signal according to the mode selection signal and the corresponding interface signal, wherein the mode control signal is used for indicating the starting recovery mode or the normal starting mode of the electronic equipment adopting the starting mode selection circuit.
The start mode selection circuit described above includes: the switch control module outputs a switch control signal to the mode selection circuit, and the mode selection circuit outputs a mode selection signal to the mode control circuit according to the switch control signal; in addition, when the input end of the interface circuit is connected with the digital interface of the computer equipment, the computer equipment supplies power for the interface circuit; when the input end of the interface circuit is connected or not connected with the digital interface of the computer equipment, the interface circuit outputs a corresponding interface signal to the mode control circuit; the mode control circuit is turned on or off under the action of the mode selection signal and the interface signal output by the interface circuit, outputs a corresponding mode control signal, and then controls the electronic equipment using the startup mode selection circuit to start a normal startup mode or a recovery mode according to the mode control signal. The starting mode selection circuit can enable the electronic equipment to select to enter a recovery mode or a normal starting mode, and is very simple in structure and convenient to operate.
According to the starting mode selection circuit, the embodiment of the invention also provides electronic equipment.
An electronic device comprises the starting mode selection circuit.
The electronic equipment adopts the starting mode selection circuit, so that the electronic equipment can conveniently enter a recovery mode or a normal starting mode, and is convenient to operate.
Drawings
FIG. 1 is a schematic diagram of a start-up mode selection circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a start-up mode selection circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a start mode selection circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to preferred embodiments and the accompanying drawings. It is clear that the examples described below are only illustrative of the invention and do not limit it. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It should be noted that, for the convenience of description, only some but not all of the matters related to the present invention are shown in the drawings.
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present. The terms "mounted," "one end," "the other end," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. In addition, the terms "first", "second", "third" and "fourth" are used herein only for distinguishing the described objects, and are not intended to limit the objects.
As shown in fig. 1, a start mode selection circuit, as shown in fig. 1, includes: switch control module 10, mode selection circuit 20, interface circuit 30, and mode control circuit 40. The switch control module 10 is connected with the mode control circuit 40 through the mode selection circuit 20; the output end of the interface circuit 30 is connected with the mode control circuit 40, the input end of the interface circuit 30 is used for accessing a digital interface of the computer equipment, and when the input end of the interface circuit 30 is accessed to the digital interface of the computer equipment, the computer equipment supplies power 40 to the interface circuit; the mode selection circuit 20 outputs a mode selection signal to the mode control circuit 40 according to the switching control signal of the switching control module 10; when the input end of the interface circuit 30 is connected or not connected to the digital interface of the computer device, the interface circuit 30 outputs a corresponding interface signal to the mode control circuit 40; the mode control circuit 40 outputs a mode control signal according to the mode selection signal and the corresponding interface signal, wherein the mode control signal is used for indicating the electronic device adopting the start mode selection circuit to start a recovery mode or a normal start mode.
Specifically, the switch control module may be any switch control element, and when the state of the switch control element changes (for example, when the switch control element is closed or opened), the switch control element outputs a corresponding switch control signal to the mode selection circuit, and an output signal of the mode selection circuit changes. In the present embodiment, when the switch control module is turned off, the mode selection circuit 20 is in an off state (or an off state). The mode selection circuit 20 is in an on state (or conducting state) when the switch control module is closed, outputting a mode selection signal. In addition, when the input end of the interface circuit 30 is connected to the digital interface of the computer device, the computer device supplies power 30 to the interface circuit; when the input end of the interface circuit 30 is connected or not connected to the digital interface of the computer device, the interface circuit 30 correspondingly outputs an interface signal to the mode control circuit 40; the interface signal is mainly a high level or low level signal, i.e. the mode control circuit 40 provides a high level or a low level, so that the mode control circuit 40 is turned on or off (i.e. turned on or off) according to the interface signal and the mode selection signal, and generates a corresponding mode control signal.
The digital interface is typically a USB interface of a computer device.
The start mode selection circuit described above includes: the computer comprises a switch control module 10, a mode selection circuit 20, an interface circuit 30 and a mode control circuit 40, wherein when the switch control module 10 outputs a switch control signal to the mode selection circuit 20, the mode selection circuit 20 outputs a mode selection signal to the mode control circuit 40 according to the switch control signal, and in addition, when the input end of the interface circuit 30 is connected with a digital interface of a computer device, the computer device supplies power to the interface circuit 30; when the input end of the interface circuit 30 is connected or not connected to the digital interface of the computer device, the interface circuit 30 correspondingly outputs an interface signal to the mode control circuit; the mode control circuit 40 is turned on or off by the mode selection signal and the interface signal output from the interface circuit 30, and outputs a corresponding mode control signal, and then controls the electronic device using the start mode selection circuit to start the normal start mode or the recovery mode according to the mode control signal. The starting mode selection circuit can enable the electronic equipment to select to enter a recovery mode or a normal starting mode, and is very simple in structure and convenient to operate.
In one embodiment, the switch control signal is a low level signal; when the switch control signal is a low level signal, the mode selection circuit 20 outputs a high level;
when the input end of the interface circuit 30 is connected to the digital interface of the computer device, the interface circuit 30 outputs a high level signal; when the input end of the interface circuit 30 is not connected to the digital interface of the computer device, the interface circuit 30 outputs a low level signal;
when the mode selection circuit outputs a low level and the interface signal outputs a low level signal, the mode control circuit outputs a high level; the mode control circuit outputs a low level when the mode selection circuit outputs a low level and the interface signal outputs a high level signal.
Specifically, the interface signal is usually a high level or low level signal, and mainly provides a high level or low level signal for the mode control circuit 40, so that the mode control circuit 40 is turned on or off, so that the mode control circuit 40 outputs a high level or low level signal according to the interface signal and the mode selection signal, and finally controls the electronic device to start the normal power-on mode or the recovery mode according to the high level or low level signal. Specifically, when the input terminal of the interface circuit 30 is connected to the digital interface of the computer device, the interface circuit 30 outputs a high level signal; when the input terminal of the interface circuit 30 is not connected to the digital interface of the computer device, the interface circuit 30 outputs a low level signal. In the present embodiment, when the mode selection circuit 20 is a low signal (i.e. outputs a low level) and the interface circuit 30 is also a low signal, the mode control circuit 40 outputs a high level, wherein the high level is generally used to enable the electronic device to enter a normal power-on mode. The mode control circuit 40 outputs a low level when the mode selection circuit 20 is a low level signal (i.e., outputs a low level) and the interface circuit 30 is a high level signal, wherein the low level is generally used to put the electronic device into a recovery mode. By adopting the level control mode, the circuit structure can be simplified.
In one embodiment, the switch control signal is a high level signal; when the switch control signal is a high level signal, the mode selection circuit 20 outputs a high level; when the mode selection circuit 20 outputs a high level and the interface signal 30 outputs a high level signal, the mode control circuit outputs a high level.
Specifically, when the switch control module 10 outputs a high level after the electronic device starts the normal power-on mode or the recovery mode, the mode selection circuit 20 is turned on and outputs a high level. When the electronic device starts the normal power-on mode or the recovery mode, the interface circuit 30 outputs a high level signal. That is, at this time, the mode selection circuit 20 is at a high level, the interface circuit 30 is also at a high level, and the mode control circuit 40 is turned off (or turned off) and outputs a high level. When the electronic device is in the normal power-on mode, the high level output by the mode control circuit 40 at this time prevents the electronic device from entering the recovery mode due to misoperation, and thus system upgrade is performed on the electronic device. When the electronic device is in the recovery mode, the high level output by the mode control circuit 40 at this time prevents the electronic device from being triggered multiple times to repeatedly enter the recovery mode. By adopting the level control mode, the mode starting of the electronic equipment is prevented from generating errors due to misoperation, and the same mode is triggered and started for multiple times.
In one embodiment, as shown in fig. 2, the mode selection circuit 20 includes a first resistor R1, a second resistor R2, and a first switch unit 21; one end of the first resistor R1 is connected to the input end of the first switch unit 21 through the second resistor R2, and is grounded through the switch control module 10; the other end of the first resistor R1 is used for connecting a first power supply VCC 1; the output terminal of the first switch control module unit 21 is connected to the mode control circuit 40.
In this embodiment, when the switch control module 10 is turned off, the first power VCC1 is connected to the input terminal of the first switch unit, and provides a high level to the input terminal of the first switch unit 21, so that the first switch unit 21 is turned on and outputs the high level. When the switch control module 10 is closed, the input terminal of the first switch unit 21 is grounded, and the input terminal of the first switch unit 21 is at a low level, so that the first switch unit 21 is turned off and outputs the low level. The mode selection circuit is simple in structure and convenient to use.
In addition, the first switching unit 21 may be a transistor. Alternatively, the transistor may be an NMOS transistor, a PMOS transistor, or the like. The transistor is a switching device which is very convenient to use, has very low power consumption and reduces the consumption of electric energy.
In one embodiment, as shown in fig. 2, the mode control circuit 40 includes a second switching unit 41 and a third resistor R3; the input terminal of the second switch unit 41 is connected to the output terminal of the first switch unit 21 and the output terminal of the interface circuit 30, the output terminal of the second switch unit 41 is connected to the second power VCC2 through the second resistor R2, and the output terminal of the second switch unit 41 is used for outputting the mode control signal.
In this embodiment, the second switch unit 41 is turned on or off according to the signal output by the first switch unit 21 and the signal output by the interface circuit, and outputs a low level or a high level, so as to control the electronic device to start the normal power-on mode or the recovery mode by using the low level or the high level. The mode control circuit is simple in structure and convenient to control, and the electronic equipment can be controlled to start different modes by utilizing the output high-level or low-level signal.
In addition, the second switching unit 41 may be a transistor. Alternatively, the transistor may be an NMOS transistor, a PMOS transistor, or the like. The transistor is a switching device which is very convenient to use, has very low power consumption and reduces the consumption of electric energy.
In one embodiment, as shown in fig. 3, the first switching unit 21 includes a first NMOS transistor Q1; one end of the first resistor R1 is connected to the gate of the first NMOS transistor Q1 through the second resistor R2, and is grounded through the switch control module 10; the other end of the first resistor R1 is used for connecting a first power supply VCC 1; the drain of the first NMOS transistor Q1 is connected to the input terminal of the second switch unit 41, and the source of the first NMOS transistor Q2 is grounded.
Specifically, a Metal-Oxide-Semiconductor Field-Effect Transistor (MOS Transistor), referred to as a mosfet for short, is a Field-Effect Transistor (fet) that can be widely used in analog circuits and digital circuits. MOS devices can be classified into two types, i.e., N-type and P-type, according to their "channel" (working carrier) polarities, and they are also commonly referred to as NMOS and PMOS transistors. The NMOS transistor and the PMOS transistor are commonly used transistors and are very convenient to use. In the present embodiment, with the NMOS transistor Q1, when the switch control module 10 is turned off, the first power VCC1 applies a high level to the gate of the first NMOS transistor Q1, and the source and drain of the first NMOS transistor Q1 are turned on, so that the second switch unit 41 is turned off. When the switch control module 10 is closed, the gate of the first NMOS transistor Q1 is grounded (i.e., a low level is applied to the gate of the first NMOS transistor Q1), and the source and drain of the first NMOS transistor are turned off, thereby causing the second switch unit 41 to be turned on. On one hand, the NMOS transistor can be used to conveniently control the mode control circuit 40 (i.e., the second switch unit 41) to be turned on or off, thereby controlling the operation of the switch control module control circuit. On the other hand, the power consumption of the NMOS is very low, and the power consumption is further reduced.
It should be understood that the NMOS transistor can be replaced by a PMOS transistor, and when the NMOS transistor is replaced by the PMOS transistor, the source electrode of the PMOS transistor should be connected with a power supply. In addition, the PMOS transistor can be replaced by other devices having the function of the switch control module, and those skilled in the art can select the PMOS transistor according to actual requirements.
In one embodiment, as shown in fig. 3, the second switching unit 42 includes a second NMOS transistor Q2; the gate of the second NMOS transistor Q2 is connected to the gate of the first NMOS transistor Q1 and the output terminal of the interface circuit 30, respectively, the drain of the second NMOS transistor Q2 is connected to the second power VCC2 through the second resistor R2, the drain of the second NMOS transistor Q2 is used for outputting the mode control signal, and the source of the second NMOS transistor Q2 is grounded.
In the present embodiment, the second switch unit 41 adopts the second NMOS transistor Q2, and when the drain of the first NMOS transistor Q1 outputs a low level and the interface circuit 30 outputs a low level (i.e., when a low level is applied to the gate of the second NMOS transistor Q2), the source and the drain of the second NMOS transistor Q2 are turned off, so that the drain of the second NMOS transistor Q2 outputs a high level. When the drain of the first NMOS transistor Q1 outputs a low level and the interface circuit 30 outputs a high level (i.e., when a high level is applied to the gate of the second NMOS transistor Q2), the source and drain of the second NMOS transistor Q2 are turned off, so that the drain of the second NMOS transistor Q2 outputs a low level. On one hand, the NMOS tube can be used for conveniently outputting the mode control signal, and further controlling the electronic equipment to start a normal starting mode or a recovery mode. On the other hand, the power consumption of the NMOS is very low, and the power consumption is further reduced.
It should be understood that the NMOS transistor can be replaced by a PMOS transistor, and when the NMOS transistor is replaced by the PMOS transistor, the source electrode of the PMOS transistor should be connected with a power supply. In addition, the PMOS transistor can be replaced by other devices having the function of the switch control module, and those skilled in the art can select the PMOS transistor according to actual requirements.
In one embodiment, as shown in FIG. 3, the interface circuit 30 includes a fourth resistor R4 and a data interface 31; the digital interface 31 is connected to the gate of the second NMOS transistor Q2 through the fourth resistor R4, and the digital interface is used for accessing a digital interface of the computer device, and when the digital interface is accessed to the digital interface of the computer device, the computer device provides a power VCC3 for the gate of the second NMOS transistor Q2 through the fourth resistor R4.
Specifically, the interface circuit 30 is mainly used for providing a high level or a low level signal to the gate of the second NMOS transistor Q2. The data interface 31 and the digital interface connected to the computer device are both USB interfaces, and when the data interface 31 is connected to the data interface of the computer device and the switch control module is closed, the power VCC3 is high, and when the switch control module is open and the data interface 31 is not connected to the digital interface connected to the computer device, the power VCC3 is low (i.e. 0). When the first NMOS transistor Q1 is turned off (i.e., the drain outputs a low level) and the data interface 31 outputs a low level, the second NMOS transistor Q2 is turned off and outputs a high level; when the first NMOS transistor Q1 is turned off (i.e., the drain outputs a low level) and the data interface 31 outputs a high level, the second NMOS transistor Q2 is turned on to output a low level, thereby controlling the activation of the electronic device in different modes according to the high level or the low level output by the second NMOS transistor Q2.
In one embodiment, as shown in fig. 3, the switch control module is a key switch, one end of the key switch is connected to the first power VCC1 through a first resistor R1, and is connected to the gate of the first NMOS transistor through a second resistor R2, and the other end of the key switch is grounded.
Specifically, each time the key switch is pressed (i.e., closed), the first NMOS transistor Q1 outputs a low level signal, and when the interface circuit 30 outputs a high level or a low level, the second NMOS transistor Q2 is enabled to output a low level or a high level, thereby controlling the activation of different modes of the electronic device.
Optionally, the key switch is a power key on the electronic device, and the electronic device can start different modes by using the start mode selection circuit in the embodiment of the invention only by operating the power key, so that the operation is convenient on one hand; on the other hand, a recovery key does not need to be arranged on the electronic equipment independently, so that the size of a board card in the electronic equipment is reduced, and the cost is saved.
To facilitate an understanding of the start-up mode selection circuit of the present invention, a more detailed embodiment is presented. As shown in fig. 3, a start mode selection circuit includes a first NMOS transistor Q1, a second NMOS transistor Q2, a first resistor R1 to a fourth resistor R4, a USB interface (i.e., the data interface in fig. 3, where the data interface selects the USB interface), and a key switch K1, VCC is a connection voltage, VCC _ USB (i.e., VCC3 in fig. 3, when the data interface selects the USB interface, VCC3 is VCC _ USB) is a voltage when the electronic device is connected to the access computer device through the USB interface, and VCC _ USB is 0 when the electronic device is not connected to the access computer device. The working principle of the starting mode selection circuit is as follows:
when the electronic device is not connected to the USB interface of the computer device, the power supplies VCC1 and VCC2 are not 0, VCC _ USB is 0, and at this time, VGS of the first NMOG transistor Q1 is greater than the threshold voltage, and Q1 is turned on; the voltage of the G-electrode of the second NMOS transistor Q2 is 0V, and Q2 is turned off, at which time the electronic device is in an off state. When the key switch control module K1 is pressed (i.e., the key switch control module K1 is closed), the G pole of Q1 is grounded and is at a low level, and Q1 is turned off, at this time, VCC _ USB is still 0, the G pole of Q2 is at a low level, Q2 is turned off, and the drain of Q2 outputs a high level (i.e., a mode control signal), so as to control the electronic device to start a normal power-on mode (i.e., the electronic device is normally powered on). When the device starts the power-on mode (i.e. after power-on), the key switch K1 is turned off, the G-high level of the Q1 is turned on, and the Q1 is turned on, at this time, the G-high level of the Q2 is always low, the drain of the Q2 always outputs high level, and the electronic device will not be triggered by mistake to enter the recovery mode.
When the electronic equipment is connected to the USB interface of the computer equipment, the power sources VCC1, VCC2 and VCC _ USB are not 0 at this time. When the key switch K1 is pressed (i.e. K1 is closed), G of Q1 is at a low level, Q1 is off, VCC _ USB is not 0, G of Q2 is at a high level, Q2 is on, and drain of Q2 outputs a low level, so that the electronic device is controlled to start a recovery mode. The computer device can detect the electronic device and perform upgrade maintenance on the electronic device.
After the device starts the recovery mode (i.e. after being turned on), the key switch K1 is turned off, the G of Q1 is at a high level, Q1 is turned on, Q1 is turned on, at this time, the G of Q2 is at a low level, Q2 is turned off, and the drain of Q2 continuously outputs a high level, so that the device cannot be triggered to start the recovery mode again.
According to the starting mode selection circuit, the invention also provides electronic equipment.
An electronic device includes the start mode selection circuit of any of the embodiments, wherein the start mode selection circuit is internal to the electronic device.
The electronic equipment adopts the starting mode selection circuit in any embodiment, so that the electronic equipment can conveniently enter a recovery mode or a normal starting mode, and is convenient to operate.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A start-up mode selection circuit, comprising: the switch control module, the mode selection circuit, the interface circuit and the mode control circuit;
the switch control module is connected with the mode control circuit through the mode selection circuit; the output end of the interface circuit is connected with the mode control circuit, the input end of the interface circuit is used for accessing a digital interface of computer equipment, and when the input end of the interface circuit is accessed to the digital interface of the computer equipment, the computer equipment supplies power to the interface circuit;
the mode selection circuit outputs a mode selection signal to the mode control circuit according to a switch control signal of the switch control module;
when the input end of the interface circuit is connected or not connected with the digital interface of the computer equipment, the interface circuit outputs a corresponding interface signal to the mode control circuit;
the mode control circuit outputs a mode control signal according to the mode selection signal and the corresponding interface signal, wherein the mode control signal is used for indicating the starting recovery mode or the normal starting mode of the electronic equipment adopting the starting mode selection circuit;
the mode control signal is used for indicating the electronic equipment adopting the starting mode selection circuit to start a recovery mode under the condition that the input end of the interface circuit is connected with a digital interface of computer equipment; and under the condition that the input end of the interface circuit is not connected with a digital interface of computer equipment, the mode control signal is used for indicating the electronic equipment adopting the starting mode selection circuit to start a normal starting mode.
2. A start mode selection circuit according to claim 1, wherein the switch control signal is a low level signal;
when the switch control signal is a low level signal, the mode selection circuit outputs a low level;
when the input end of the interface circuit is connected with the digital interface of the computer equipment, the interface circuit outputs a high-level signal;
when the input end of the interface circuit is not connected with the digital interface of the computer equipment, the interface circuit outputs a low level signal;
when the mode selection circuit outputs a low level and the interface signal outputs a low level signal, the mode control circuit outputs a high level;
and when the mode selection circuit outputs a low level and the interface signal outputs a high level signal, the mode control circuit outputs a low level.
3. A start mode selection circuit according to claim 2, wherein the switch control signal is a high level signal;
when the switch control signal is a high level signal, the mode selection circuit outputs a high level;
and when the mode selection circuit outputs a high level and the interface signal is a high level signal, the mode control circuit outputs a high level.
4. A start mode selection circuit according to any of claims 1-3, characterized in that the mode selection circuit comprises a first resistor, a second resistor and a first switching unit;
one end of the first resistor is connected with the input end of the first switch unit through the second resistor and is grounded through the switch control module; the other end of the first resistor is used for connecting a first power supply; the output end of the first switch unit is connected with the mode control circuit.
5. A start mode selection circuit according to claim 4, characterized in that the mode control circuit comprises a second switching unit and a third resistor;
the input end of the second switch unit is respectively connected with the output end of the first switch unit and the output end of the interface circuit, the output end of the second switch unit is connected with a second power supply through the second resistor, and the output end of the second switch unit is used for outputting the mode control signal.
6. A start-up mode selection circuit according to claim 5 wherein the first switching unit comprises a first NMOS transistor;
one end of the first resistor is connected with the grid electrode of the first NMOS tube through the second resistor and is grounded through the switch control module; the other end of the first resistor is used for connecting a first power supply; the drain of the first NMOS transistor is connected to the input terminal of the second switch unit 42, and the source of the first NMOS transistor is grounded.
7. A start-up mode selection circuit according to claim 6 wherein the second switching unit comprises a second NMOS transistor;
the grid electrode of the second NMOS tube is respectively connected with the grid electrode of the first NMOS tube and the output end of the interface circuit, the drain electrode of the second NMOS tube is connected with a second power supply through the second resistor, the drain electrode of the second NMOS tube is used for outputting the mode control signal, and the source electrode of the second NMOS tube is grounded.
8. A start mode selection circuit according to claim 7 wherein the interface circuit comprises a fourth resistor and a digital interface;
the digital interface is connected with the grid electrode of the second NMOS tube through the fourth resistor;
the digital interface is used for accessing the digital interface of the computer equipment.
9. A start-up mode selection circuit as claimed in claim 6, wherein the switch control module is a key switch, one end of the key switch is connected to the first power supply through the first resistor, and is connected to the gate of the first NMOS transistor through the second resistor, and the other end of the key switch is grounded.
10. An electronic device comprising the startup mode selection circuit of any of claims 1-9.
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| CN201810259511.3A CN108519892B (en) | 2018-03-27 | 2018-03-27 | Start mode selection circuit and electronic equipment |
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| CN201810259511.3A CN108519892B (en) | 2018-03-27 | 2018-03-27 | Start mode selection circuit and electronic equipment |
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| CN114185603B (en) * | 2021-11-08 | 2024-01-05 | 深圳云天励飞技术股份有限公司 | Control method of intelligent accelerator card, server and intelligent accelerator card |
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