CN211857466U - Memory read-write circuit and electronic equipment - Google Patents

Abstract

The application provides a memorizer reads and writes circuit and electronic equipment, this memorizer reads and writes the circuit and includes: the device comprises a memory, a VGA interface, an SOC and a circuit switching module; the circuit switching module is respectively connected with the SOC, the VGA interface and the memory; the circuit switching module is used for switching between a first connection state and a second connection state, wherein the first connection state is that the memory is connected with the SOC, and the second connection state is that the memory is connected with the VGA interface. The memory read-write circuit changes the circuit connection relation by using the circuit switching module. The SOC and the VGA interface are respectively connected with the memory in different states, so that the VGA interface and the SOC are separated from the read-write process of the memory data, and read-write conflict is avoided.

Description

Memory read-write circuit and electronic equipment

Technical Field

The present disclosure relates to circuit technologies, and in particular, to a memory read/write circuit and an electronic device.

Background

The I2C (Inter-Integrated Circuit) bus is a simple, bi-directional two-wire synchronous serial bus. It requires only two wires to transfer information between devices connected to the bus.

Video Graphics Array (VGA) interfaces are the most widely used interface types on Video cards, and most Video cards have such interfaces. It can transmit red, green and blue analog signals as well as synchronization signals (horizontal and vertical signals).

Many electronic devices use a video card with a VGA interface to connect with an external device to realize signal transmission. After the electronic device is connected with an external device through the VGA interface, the external device can be connected to the I2C bus through the VGA interface, and then connected to the memory inside the electronic device, so as to implement signal transmission. However, a System On Chip (SOC) inside the electronic device also exchanges data with the memory through the I2C bus. This makes the VGA and SOC read and write the memorizer in conflict, resulting in the read and write failure.

SUMMERY OF THE UTILITY MODEL

The application provides a memory read-write circuit and electronic equipment, which realize the separation of VGA and SOC read-write processes and avoid read-write conflicts.

In a first aspect, the present application provides a memory read/write circuit, including: the device comprises a memory, a Video Graphics Array (VGA) interface, a system integrated chip (SOC) and a circuit switching module; the circuit switching module is respectively connected with the SOC, the VGA interface and the memory; the circuit switching module is used for switching between a first connection state and a second connection state, wherein the first connection state is that the memory is connected with the SOC, and the second connection state is that the memory is connected with the VGA interface.

Optionally, the circuit switching module is communicatively connected to the SOC, the VGA interface, and the memory through an I2C bus, respectively.

Optionally, the control end of the circuit switching module is further electrically connected to the VGA interface.

Optionally, the circuit switching module is configured to switch between a first connection state and a second connection state when the voltage of the VGA interface changes.

Optionally, the circuit switching module includes: the circuit switches the chip.

Optionally, the circuit switching chip is electrically connected to the VGA interface through a switching device.

Optionally, the switching device includes: and a triode.

Optionally, the circuit switching module further includes: the circuit comprises a first resistor, a second resistor, a first diode and a second diode; the first end of the first resistor is connected with the VGA interface and the first end of the first diode, and the second end of the first resistor is connected with the base electrode of the triode; the second end of the first diode is connected with the first end of the second resistor, the first pin of the circuit switching chip and the first end of the second diode; and the collector of the triode is connected with the second end of the second resistor and the second pin of the circuit switching chip, and the emitter of the triode is grounded.

Optionally, the VGA interface is used for connecting a display device.

In a second aspect, the present application provides an electronic device comprising: memory read and write circuitry as described in the first aspect.

The application provides a memorizer reads and writes circuit and electronic equipment, this memorizer reads and writes the circuit and includes: the device comprises a memory, a VGA interface, an SOC and a circuit switching module; the circuit switching module is respectively connected with the SOC, the VGA interface and the memory; the circuit switching module is used for switching between a first connection state and a second connection state, wherein the first connection state is that the memory is connected with the SOC, and the second connection state is that the memory is connected with the VGA interface. The memory read-write circuit changes the circuit connection relation by using the circuit switching module. The SOC and the VGA interface are respectively connected with the memory in different states, so that the VGA interface and the SOC are separated from the read-write process of the memory data, and read-write conflict is avoided.

Drawings

In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic view of an application scenario provided in the present application;

fig. 2 is a schematic structural diagram of a memory read/write circuit according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a read/write circuit of a memory according to a third embodiment of the present application;

fig. 4 is a schematic structural diagram of an electronic device according to a fourth embodiment of the present application.

Detailed Description

To make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application, and it is obvious that the described embodiments are some, but not all embodiments of the present application. 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 application.

Video Graphics Array (VGA) interfaces are the most widely used interface types on Video cards, and most Video cards have such interfaces. It can transmit red, green and blue analog signals as well as synchronization signals (horizontal and vertical signals).

Many electronic devices use a video card with a VGA interface to connect with an external device to realize signal transmission. After the electronic equipment is connected with external equipment through the VGA interface, the external equipment can be connected with a memory inside the electronic equipment through the VGA interface so as to realize signal transmission. The external device may process the signal read from the memory or further convert it into a video or image picture for display.

The external device generally accesses the I2C bus inside the electronic device through the VGA interface to read the data in the memory. While the SOC inside the electronic device also typically exchanges data with the memory over the I2C bus. Particularly, when the system is started, the VGA interface and the SOC can simultaneously read and write data in the memory. The I2C bus is a simple, bidirectional two-wire synchronous serial bus that cannot respond to data requests from two devices simultaneously. This causes the VGA and SOC to fail the read/write process of the memory due to the conflict.

Based on this, this application provides a memory read-write circuit. The circuit can be arranged in electronic equipment, in particular equipment which needs to carry out video signal data transmission with external equipment. The circuit can realize the isolation of the connection path between the memory connector and the VGA port and the connection path between the memory and the SOC, and avoid the occurrence of read-write conflict.

Fig. 1 is a schematic view of an application scenario provided in the present application. As shown in fig. 1, taking a computer host 101 as an example, a main board thereof is provided with a memory read-write circuit provided by the present application. The computer host 101 is connected to the display device 102 via a VGA interface. After the host computer 101 is powered on and the display device 102 is not turned on, the SOC of the host computer 101 writes data into the memory. After the display device 102 is turned on, data is read from the memory through the VGA interface and displayed. The specific structure of the memory read/write circuit is illustrated by the following embodiments.

Example one

Fig. 2 is a schematic structural diagram of a memory read-write circuit according to an embodiment of the present disclosure, and as shown in fig. 2, the memory read-write circuit according to the embodiment may specifically include: the device comprises a memory 201, a VGA interface 202, an SOC203 and a circuit switching module 204; the circuit switching module 204 is respectively connected with the SOC203, the VGA interface 202 and the memory 201; the circuit switching module 204 is configured to switch between a first connection state and a second connection state, where the first connection state is that the memory 201 is connected to the SOC203, and the second connection state is that the memory 201 is connected to the VGA interface 202.

The specific implementation manner of the circuit switching module may be set according to actual needs, and is not limited herein.

In an alternative embodiment, the circuit switching module may be user controlled.

For example, the circuit switching module 204 may be configured as a module that can control the connection status through the peripheral buttons. The first connection state is switched to the second connection state after the key is pressed, and the second connection state is switched to the first connection state after the key is pressed again.

For another example, the circuit switching module 204 may be configured as a module that can control the connection state through a voice signal. A voice recognition module may be provided in the circuit conversion module 204. And after receiving the corresponding voice signal instruction, switching from the first connection state to the second connection state, or switching from the second connection state to the first connection state.

In another alternative embodiment, the circuit switching module 204 may implement the switching according to a preset strategy.

For example, the circuit switching module 204 can be configured as a module that can control the connection state according to the voltage variation. The first connection state is switched to the second connection state when the voltage changes from a high level to a low level, or the second connection state is switched to the first connection state when the voltage changes from a high level to a low level.

For another example, the circuit switching module 204 can be configured as a module that can control the connection state according to the current variation. The switching from the first connection state to the second connection state is performed when the current is changed from the first preset value to the second preset value, or the switching from the second connection state to the first connection state is performed when the current is changed from the first preset value to the second preset value.

For another example, the circuit switching module 204 may be configured as a module capable of controlling the connection state according to time variation, and switching from the first connection state to the second connection state when reaching the first time node, or switching from the second connection state to the first connection state when reaching the first time node.

It will be appreciated that the various factors affecting the connection state described above are all factors related to the operating state of the external device or the on state of the VGA line.

The memory read-write circuit of the embodiment comprises: the device comprises a memory, a VGA interface, an SOC and a circuit switching module; the circuit switching module is respectively connected with the SOC, the VGA interface and the memory; the circuit switching module is used for switching between a first connection state and a second connection state, wherein the first connection state is that the memory is connected with the SOC, and the second connection state is that the memory is connected with the VGA interface. And changing the circuit connection relation by using the circuit switching module. The SOC and the VGA interface are respectively connected with the memory in different states, so that the VGA interface and the SOC are separated from the read-write process of the memory data, and read-write conflict is avoided.

Specifically, the first connection state mentioned in the present application is that the memory is connected to the SOC and not connected to the VGA interface. The second connection state is that the memory is connected with the VGA interface and is not connected with the SOC.

Thus, the first connection state and the second connection state are completely independent connection states from each other. The connection between the VGA interface and the memory and the connection between the SOC and the memory are completely independent of each other.

Specifically, the circuit switching module is respectively connected with the SOC, the VGA interface and the memory through an I2C bus in a communication manner.

In the first connection state, the SOC is connected to the memory, and data is written into the memory through the I2C bus. The written data includes VGA video data.

In the second connection state, the VGA interface is connected to the memory and reads data from the memory via the I2C bus. The read data includes VGA video data. The read data can be acquired by an external device connected with the VGA interface for subsequent data processing or video display.

Example two

The memory read-write circuit of this embodiment may specifically include: the device comprises a memory, a VGA interface, an SOC and a circuit switching module; the circuit switching module is respectively connected with the SOC, the VGA interface and the memory; the circuit switching module is used for switching between a first connection state and a second connection state, wherein the first connection state is that the memory is connected with the SOC, and the second connection state is that the memory is connected with the VGA interface.

And the control end of the circuit switching module is also electrically connected with the VGA interface.

The control terminal referred to in this application refers to the input terminal of the control signal.

In this embodiment, on the basis of the foregoing embodiment, the connection relationship between the control terminal of the circuit switching module and the VGA interface is newly added. For parts of the present embodiment that are not described in detail, reference may be made to the description of the foregoing embodiments.

Specifically, the control end of the circuit switching module is electrically connected to the VGA interface, that is, the VGA interface controls the input of the control signal of the circuit switching module. Through the connection mode, the states of the circuit switching module and the VGA interface can be bound.

The switching state between the first connection state and the second connection state is consistent with the state of the VGA interface, so that the separation of the VGA interface and the SOC in the reading and writing process of the data of the memory can be realized, and the connection state after switching can be ensured to meet the reading and writing requirements of the current VGA interface or SOC on the data of the memory.

For example, when the VGA interface state indicates that the external device is connected, the control terminal input of the circuit switching module switches the connection state of the circuit switching module to the second connection state, that is, the memory is connected to the VGA interface. At this time, the external device can be supported to read the memory data through the VGA interface.

In some embodiments, the input of the control terminal signal of the circuit switching module can be determined by the change of the VGA interface current state. Correspondingly, the circuit switching module switches between the first connection state and the second connection state when the current of the VGA interface changes.

Specifically, the circuit switching module may be provided with a current detection circuit, which is directly connected to the VGA interface, or connected to the VGA through another current conversion circuit.

In other embodiments, the input of the control end signal of the circuit switching module can also be determined by the change of the voltage state of the VGA interface.

Correspondingly, the circuit switching module switches between the first connection state and the second connection state when the voltage of the VGA interface changes.

Specifically, the circuit switching module may be directly connected to a voltage signal line of the VGA interface, or may be connected to a voltage signal line of the VGA interface through another voltage conversion circuit.

The voltage of the VGA interface may indicate the VGA line on state.

When the VGA wire is connected, the VGA interface voltage is at a high level. If the circuit switching module is directly connected with the VGA interface, the input signal of the control end is at a high level at the moment. If the circuit switching module is connected to the VGA interface through another circuit, the input signal of the control terminal may be at a high level or a low level. The voltage signal input by the control end enables the circuit switching module to be switched from the first connection state to the second connection state, the connection between the memory and the SOC is disconnected, and the connection between the memory and the VGA interface is connected.

When the VGA wire is not connected, the VGA interface voltage is at a low level. If the circuit switching module is directly connected with the VGA interface, the input signal of the control end is at a high level at the moment. If the circuit switching module is connected to the VGA interface through another circuit, the input signal of the control terminal may be at a high level or a low level. The voltage signal input by the control end enables the circuit switching module to be switched from the second connection state to the first connection state, the VGA interface connection between the memory and the SOC is disconnected, and the connection between the memory and the SOC is connected.

In some embodiments, the structure of the circuit switching module may include: the circuit switches the chip.

One input pin of the circuit switching chip can be directly or indirectly connected to the VGA interface, and the SOC and the VGA interface can be respectively connected to two output pins of the circuit switching chip. The control of the connection state of the SOC and the VGA interface according to the VGA interface voltage can be realized only by setting the corresponding relation between the input signal and the output signal.

For example, when the input pin is set to high level, the output pin connected to the SOC may be set to low level, and the output pin connected to the VGA interface may be set to high level. This makes it possible to realize that the electronic switching module is in the second connection state when the input is high.

Only one setting is listed here, and other settings are possible depending on the actual circuit implementation. In addition, the implementation manner of the correspondence between the chip input level and the chip output level may refer to the related art, and is not described herein again.

In some embodiments, one implementation of a circuit switched chip peripheral circuit may include: the circuit switching chip is electrically connected with the VGA interface through a switching device.

The switching device may include a triode, a thyristor, or the like. The implementation circuit will be different according to its working principle.

EXAMPLE III

Fig. 3 is a schematic structural diagram of a memory read/write circuit according to a third embodiment of the present application. As shown in fig. 3, the switching device is exemplified by a transistor. The circuit switching module of the embodiment includes: memory 201, VGA interface 202, SOC203, and circuit switching module 204.

Wherein the circuit switching module 204 comprises: the circuit comprises a triode 301, a first resistor 302, a second resistor 303, a first diode 304, a second diode 305 and a circuit switching chip 306.

A first end of the first resistor 302 is connected to the VGA interface 202 and a first end of the first diode 304, and a second end of the first resistor 302 is connected to a base of the triode 301; a second end of the first diode 304 is connected with a first end of the second resistor 303, a first pin of the circuit switching chip 306 and a first end of the second diode 305; the collector of the transistor 301 is connected to the second terminal of the second resistor 303 and the second pin of the circuit switching chip 306, and the emitter of the transistor 301 is grounded.

The third pin of the circuit switching chip 306 is connected to the SOC203 through an I2C bus, the fourth pin of the circuit switching chip 306 is connected to the first end of the VGA interface 202 through an I2C bus, and the fifth pin of the circuit switching chip 306 is connected to the first end of the memory 201 through an I2C bus.

The second terminal of the memory 201 is also electrically connected to a second terminal of the VGA interface 202.

A second terminal of the VGA interface 202 is coupled to a VGA interface voltage source. A second terminal of the second diode 305 is connected to a system voltage source.

In this embodiment, on the basis of the foregoing embodiment, a specific circuit structure of the circuit switching module is newly added. For parts of the present embodiment that are not described in detail, reference may be made to the description of the foregoing embodiments.

The circuit switching chip 306 may be an electronic switch chip. The first pin is a switch control pin in the electronic switch chip.

The memory 201 may be provided as a charged erasable programmable read-only memory (EEPROM), also known as an E2 PROM.

When the VGA wire is not connected, the VGA voltage is at a low level, the triode circuit is cut off at the moment, the swing control pin is at a high level, the circuit switching chip 306 can switch the I2C of the E2PROM to the SOC, and at the moment, the SOC can carry out read-write operation on the E2PROM without being influenced by the VGA interface.

When a VGA wire is connected, the VGA voltage is high level, the triode circuit is conducted at the moment, the swing control pin is low level, the circuit switching chip 306 is switched to the VGA interface through the triode circuit, and external equipment can read and write the E2PROM through the VGA interface without being influenced by the SOC.

The SOC and the VGA interface are respectively connected with the memory in different states, so that the VGA interface and the SOC can be separated from the read-write process of the memory data, and read-write conflict is avoided.

It should be noted that the present embodiment provides only one of the implementation circuits, and those skilled in the art can adjust the implementation circuits to obtain a similar structure without creative efforts. But are within the scope of the present application.

In some embodiments, a VGA interface may be used to connect a display device.

Example four

Fig. 4 is a schematic structural diagram of an electronic device according to a fourth embodiment of the present application. As shown in fig. 4, the electronic device 400 of the present embodiment includes: memory read-write circuits 401. The structure of the memory read-write circuit 401 may adopt the structure of the embodiment corresponding to fig. 2 or fig. 3, and the implementation principle and the technical effect are similar, which are not described herein again.

The electronic device 400 of this embodiment may be a host computer, and may also be other terminal devices.

The embodiments or implementation modes in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.

In the description of the present specification, it is to be noted that the terms "connected" and "connected" are to be construed broadly and their meanings in the present application may be understood by those skilled in the art as appropriate, unless otherwise explicitly specified or limited.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged where appropriate.

In the description of the present specification, reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention.

In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A memory read-write circuit, comprising: the device comprises a memory, a Video Graphics Array (VGA) interface, a system integrated chip (SOC) and a circuit switching module;

the circuit switching module is respectively connected with the SOC, the VGA interface and the memory;

the circuit switching module is used for switching between a first connection state and a second connection state, wherein the first connection state is that the memory is connected with the SOC, and the second connection state is that the memory is connected with the VGA interface.

2. The memory read-write circuit of claim 1, wherein the circuit switching module is communicatively connected to the SOC, the VGA interface, and the memory via an I2C bus, respectively.

3. The memory read-write circuit according to claim 1 or 2, wherein the control terminal of the circuit switching module is further electrically connected to the VGA interface.

4. The memory read-write circuit of claim 3, wherein the circuit switching module is configured to switch between a first connection state and a second connection state when the voltage of the VGA interface changes.

5. The memory read-write circuit of claim 1 or 2, wherein the circuit switching module comprises: the circuit switches the chip.

6. The circuit of claim 4, wherein the circuit switching chip is electrically connected to the VGA interface through a switching device.

7. The circuit of claim 6, wherein the switching device comprises: and a triode.

8. The circuit of claim 7, wherein the circuit switching module further comprises: the circuit comprises a first resistor, a second resistor, a first diode and a second diode;

the first end of the first resistor is connected with the VGA interface and the first end of the first diode, and the second end of the first resistor is connected with the base electrode of the triode;

the second end of the first diode is connected with the first end of the second resistor, the first pin of the circuit switching chip and the first end of the second diode;

and the collector of the triode is connected with the second end of the second resistor and the second pin of the circuit switching chip, and the emitter of the triode is grounded.

9. A circuit according to claim 1 or 2, wherein the VGA interface is for connecting a display device.

10. An electronic device, comprising: the memory read-write circuit of any of claims 1-9.

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