Method and device for automatically configuring IO (Input / Output) characteristics of GPU (Graphics Processing Unit) digital display signal

Abstract

The invention provides a method and device for automatically configuring GPU digital display signal IO characteristics, and the method comprises the steps: reading the power supply voltage, display frequency and board card model of a GPU display card after power-on reset or detection of a hot plug signal, and carrying out the matching from a preset mapping table to an IO driving capability level; and configuring an IO module according to the matched IO driving capability level and the lower-level circuit level standard of the GPU digital display signal. According to the method, the display resolution of the GPU display card and the change condition of the power supply voltage are monitored in real time, the IO driving capacity is automatically adjusted according to the change to achieve the optimal display effect, the self-adaptive capacity of a GPU DVO interface under different board cards and different application scenes can be improved, and meanwhile power consumption is reduced as much as possible; while the optimal matching of the GPU and the downstream interface chip or the display equipment is ensured, the problem of consistency of drivers on different board cards is also avoided, the workload of software engineers is reduced, and the production efficiency is favorably improved.

Description

Technical Field

[0001] The present invention relates to the field of GPU configuration, and more specifically, to a method and device for automatically configuring GPU digital display signal IO characteristics. Background Art

[0002] At present, the iteration of domestic GPU chip products is accelerating, and the chip functions are becoming more powerful. In order to adapt to the growing user needs, various types of graphics cards have been derived, such as full-height cards, half-height cards, etc. The IO characteristics required by the GPU DVO (Digital Video Output) interface are different in different boards and different application scenarios. The GPU DVO signal is output to the lower-level circuit through the digital IO PAD. One digital video output signal mainly includes pixel clock, line synchronization signal (HSYNC), field synchronization signal (VSYNC), display enable signal (DE), red signal (RED[7:0]), green signal (GREEN[7:0]) and blue signal (BLUE[7:0]). In the following text, the red, green and blue signals are collectively referred to as RGB signals. The pixel clock, DE signal, line field signal and RGB signal each play different roles and functions in the display system. The pixel clock is mainly used to control the transmission speed and synchronization of pixel data to ensure that each data can be transmitted on time. The frequency of the pixel clock is related to the resolution of the display. The higher the resolution and refresh rate, the higher the frequency. DE is the RGB data enable signal. The line field signal is responsible for controlling the image scanning process, including the start and end of the line, and the start and end of the frame. The RGB signal is the actual image data, and the color of each pixel is composed of three colors: red, green, and blue. The lower-level circuit of DVO is the interface conversion chip (which converts the DVO interface into other interfaces) or the display device. Different display devices and interface conversion chips have different interface level standards. At the same time, the characteristic impedance and trace length of different boards (cables) are also different, and the requirements for driving capabilities are also different. Too small driving capability causes the signal to rise too slowly and the voltage swing becomes smaller, which may cause the display to be unable to be driven; too large IO driving capability may introduce noise, thereby reducing signal quality and increasing power consumption. Inappropriate driving capability configuration will affect the display effect.

[0003] Under the existing technology, in order to adapt to the different IO characteristics of each board to achieve better display effects, different drivers need to be customized for each board. This process increases the workload of software engineers and reduces production efficiency; at the same time, when the host switches the display resolution, it cannot update the optimal IO driver capability configuration in real time to obtain the best display effect. Summary of the invention

[0004] The present invention aims at the technical problems existing in the prior art and provides a method and a device for automatically configuring IO characteristics of a GPU digital display signal.

[0005] According to a first aspect of the present invention, there is provided a method for automatically configuring IO characteristics of a GPU digital display signal, comprising:

[0006] After power-on reset or hot-plug signal detection, read the power supply voltage, display frequency and board model of the GPU graphics card;

[0007] According to the power supply voltage, display frequency and board model of the GPU graphics card, the IO driving capability level is matched from a preset mapping table, wherein the mapping table stores a mapping relationship between the power supply voltage range, display frequency and board model of the GPU graphics card and the IO driving capability level;

[0008] Configure the IO module according to the matched IO drive capability level and the lower circuit level standard of the GPU digital display signal.

[0009] Based on the above technical solution, the present invention can also make the following improvements.

[0010] Optionally, the configuration of the mapping table includes:

[0011] In the test phase, the IO drive capability range is determined according to the winding length of the GPU graphics card DVO signal and the display frequency of the connected display device, and all IO drive capability gears are traversed within the IO drive capability range to find the optimal IO drive capability level of the GPU graphics card of this board model at this display frequency. The optimal IO drive capability level means that the display content of the display device is clear and the display power consumption is minimal;

[0012] Traverse and find the optimal IO drive capability level for all models of boards and all display frequencies;

[0013] According to the difference between the power supply voltage of the GPU graphics card and the standard voltage, the optimal IO driving capability level is adjusted to obtain the mapping relationship between the power supply voltage range, display frequency, board model and IO driving capability level of the GPU graphics card.

[0014] Optionally, adjusting the optimal IO drive capability level according to the difference between the power supply voltage of the GPU graphics card and the standard voltage includes:

[0015] When the power supply voltage of the GPU graphics card is lower than the standard voltage, the IO drive capability level is increased; conversely, when the power supply voltage of the GPU graphics card is higher than the standard voltage, the IO drive capability level is reduced.

[0016] Optionally, configuring the IO module according to the matched IO drive capability level and the lower circuit level standard of the GPU graphics card further includes:

[0017] The IO module is configured according to the matched IO driving capability level and the lower circuit level standard of the GPU digital display signal, and then further includes:

[0018] Read the current display frequency and current power supply voltage of the current GPU graphics card in real time, and calculate the voltage range of the power supply voltage, compare the current display frequency and current power supply voltage range with the previous display frequency and power supply voltage range, and determine whether the voltage range of the current display frequency and current power supply voltage has changed;

[0019] If there is any change, find the optimal IO drive capability level according to the GPU graphics card model, the changed display frequency and the power supply voltage range, and reconfigure the IO module.

[0020] According to a second aspect of the present invention, there is provided a device for automatically configuring IO characteristics of a GPU digital display signal, comprising an IO characteristic configuration module and an onboard Flash, wherein the IO characteristic configuration module comprises a monitoring control module;

[0021] The monitoring control module is used to read the power supply voltage, display frequency and board model of the GPU graphics card after power-on reset or detection of a hot plug signal; and match the IO drive capability level from the preset mapping table of the onboard Flash according to the power supply voltage, display frequency and board model of the GPU graphics card, wherein the mapping table stores a mapping relationship between the power supply voltage range, display frequency and board model of the GPU graphics card and the IO drive capability level;

[0022] The IO characteristic configuration module is used to configure the IO module according to the matched IO driving capability level and the lower circuit level standard of the GPU digital display signal.

[0023] Optionally, the device further includes a voltage monitoring module, a DVO control module and a QSPI control module; the monitoring control module is used to read the power supply voltage, display frequency and board model of the GPU graphics card after power-on reset or detecting a hot plug signal, including:

[0024] The monitoring control module accesses the voltage monitoring module through the on-chip bus to read the current power supply voltage V0, accesses the DVO control module to read the current display frequency F0, and reads the board model S0 written with the board in the board Flash through the QSPI control module.

[0025] Optionally, the IO characteristic configuration module further includes a voltage register, a frequency register, a board model register, a drive capability register and a level standard register; the IO drive capability level is matched from the preset mapping table of the onboard Flash according to the power supply voltage, display frequency and board model of the GPU graphics card, including:

[0026] The monitoring control module calculates the power supply voltage interval V0 according to the current power supply voltage V0 of the GPU graphics card read, and stores the power supply voltage interval V0, the current display frequency F0 and the board model S0 in the voltage register, the frequency register and the board model register respectively;

[0027] The monitoring control module accesses the onboard Flash through the QSPI control module, and reads the corresponding driving capability level and the lower circuit level standard of the GPU digital display signal in the mapping table of the onboard Flash according to the current power supply voltage interval V0, display frequency F0 and board model S0 values ​​in the voltage register, frequency register and board model register;

[0028] The driving capability level and the level standard of the lower circuit of the GPU digital display signal are written into the driving capability register and the level standard register for storage.

[0029] Optionally, the IO characteristic configuration module is used to configure the IO module according to the matched IO driving capability level and the lower circuit level standard of the GPU graphics card, including:

[0030] The IO characteristic configuration module configures the IO module related registers according to the IO driving capability level in the driving capability register and the level standard register and the level standard of the lower circuit to complete the configuration of the DVO IO characteristic.

[0031] Optionally, the monitoring and control module is further used to:

[0032] At regular intervals, the voltage monitoring module and the DVO control module are accessed again through the bus to read the power supply voltage V1 and the display frequency F1 at that time and calculate the voltage interval V1 of the power supply voltage at that time;

[0033] The power supply voltage interval V1 is compared with the value V0 of the voltage register, and the display frequency F1 is compared with the value F0 of the frequency register. If V1=V0 and F1=F0, wait for the next reading;

[0034] If V1≠V0 or F1≠F0, the read power supply voltage interval V1 and display frequency F1 are written into the voltage register and frequency register, and the IO module is reconfigured.

[0035] The present invention provides a method and device for automatically configuring the IO characteristics of a GPU digital display signal, which monitors the display resolution and power supply voltage changes of a GPU graphics card in real time, and automatically adjusts the IO driving capability according to the changes to achieve the optimal display effect, thereby improving the adaptive capability of a GPU DVO interface in different boards and different application scenarios, and reducing power consumption as much as possible; while ensuring the optimal matching of a GPU and a downstream interface chip or a display device, it also avoids the consistency problem of driving on different boards, thereby reducing the workload of software engineers and facilitating the improvement of production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A flow chart of a method for automatically configuring GPU digital display signal IO characteristics provided by the present invention;

[0037] Figure 2 A schematic diagram of the structure of a device for automatically configuring IO characteristics of a GPU digital display signal provided by the present invention;

[0038] Figure 3 The overall flow chart of the method for automatically configuring GPU digital display signal IO characteristics. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In addition, the technical features in the various embodiments or single embodiments provided by the present invention can be arbitrarily combined with each other to form a feasible technical solution. This combination is not subject to the constraints of the sequence of steps and / or the structural composition mode, but must be based on the ability of ordinary technicians in this field to achieve. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] Currently, the types of graphics card products are increasing. The IO characteristics required by the GPU DVO interface in different boards and different application scenarios are also different. In order to achieve better display effects, different drivers need to be customized according to different boards. This process will increase the workload of software engineers and reduce production efficiency. At the same time, when the host switches the display resolution, it cannot update the optimal IO driver capability configuration in real time to obtain the optimal display effect.

[0041] In order to improve the adaptive ability of the GPU DVO interface in different boards and different application scenarios, achieve the best output effect, and reduce power consumption as much as possible, the present invention provides a method for automatically configuring the GPU digital video output IO characteristics. The level standard, IO drive capability and other information of the GPU downstream interface or display device are stored in the onboard Flash, and the display frequency and power supply voltage are monitored in real time. The optimal IO characteristics are automatically configured according to the frequency and voltage to ensure the optimal match between the GPU and the downstream interface chip or display device, and avoid the consistency problem of the driver on different boards.

[0042] Figure 1 A flow chart of a method for automatically configuring GPU digital display signal IO characteristics of the present invention is provided, such as Figure 1 As shown, the method includes:

[0043] Step 1: After power-on reset or detecting a hot-plug signal, read the power supply voltage, display frequency, and board model of the GPU graphics card.

[0044] It is understandable that when a power-on reset of the GPU graphics card is detected or a hot plug signal is detected, the current working power supply voltage, display frequency and board model of the GPU graphics card are read.

[0045] Step 2: According to the power supply voltage, display frequency and board model of the GPU graphics card, the IO drive capability level is matched from a preset mapping table, wherein the mapping table stores a mapping relationship between the power supply voltage range, display frequency and board model of the GPU graphics card and the IO drive capability level.

[0046] It is understandable that the IO drive capability level is matched from the preset mapping table according to the power supply voltage, display frequency and board model of the GPU graphics card obtained in step 1. The mapping table stores the mapping relationship between the power supply voltage range, display frequency and board model of the GPU graphics card and the IO drive capability level.

[0047] The configuration process of the mapping table is as follows: in the test phase, the IO drive capability range is determined according to the GPU graphics card DVO signal winding line length and the display frequency of the connected display device, and all IO drive capability gears are traversed within the IO drive capability range to find the optimal IO drive capability level of the GPU graphics card of this board model at this display frequency. The optimal IO drive capability level refers to the display content of the display device being clear and the display power consumption being minimal, wherein the GPU graphics card DVO signal winding line length is related to the board model of the GPU graphics card.

[0048] Traverse and find the optimal IO drive capability level for all models of boards and all display frequencies;

[0049] According to the difference between the power supply voltage of the GPU graphics card and the standard voltage, the optimal IO driving capability level is adjusted to obtain the mapping relationship between the power supply voltage range, display frequency, board model and IO driving capability level of the GPU graphics card.

[0050] Specifically, during the GPU graphics card testing phase, the approximate range of the driving capability is determined based on the line length of the GPU DVO signal on the board (the line length is related to the board model) and the display frequency of the display device connected to the GPU graphics card. Within this range, all driving capability gears are traversed to find the optimal IO driving capability configuration scheme for this board at this display frequency. In this way, the optimal IO driving capability configuration scheme for all types of boards corresponding to all display frequencies is found.

[0051] At the same time, considering that voltage instability may occur during the use of the graphics card, consider using the method of adjusting the drive capability to compensate. For example, when the power supply voltage is lower than expected, a certain degree of compensation is made by increasing the IO drive capability. Based on this idea, during the test phase, the power supply voltage is modified by 0.3v as a gear to simulate the voltage instability condition, as described above, to find the optimal IO drive capability configuration scheme in this case. Finally, a mapping table of the optimal IO drive capability configuration scheme is obtained, that is, by entering the "graphics card code, board power supply voltage range and current display frequency", the corresponding IO drive capability optimal configuration scheme can be found.

[0052] The mapping table stores the mapping relationship between the board model, power supply voltage range, display frequency and IO drive capability level. See Table 1 for the content of the mapping table.

[0053] Table 1 Best IO drive capability configuration scheme mapping table

[0054]

[0055]

[0056] In Table 1, S* indicates the board model; V* indicates the power supply voltage range, with 0.3v as one gear, then V0: 2.4-2.7vV1: 2.7-3.0v...; F* indicates the display frequency; DS* indicates the driving capability level.

[0057] It can be seen from the first row of this mapping table that for board S0, when the power supply voltage is in the V0 range and the display frequency is F0, the corresponding optimal IO drive capability configuration level is DS0.

[0058] While burning the BIOS, the above drive capability configuration scheme mapping table and the DVO signal lower circuit interface level standard on the board are burned into the onboard Flash in the format shown in Table 2.

[0059] Table 2 Board flash storage format

[0060] S* V* F* DS* L*

[0061] Step 3: Configure the IO module according to the matched IO drive capability level and the lower circuit level standard of the GPU graphics card.

[0062] It is understandable that, according to the IO driving capability level matched in step 2 and the lower circuit level standard of the GPU digital display signal, the IO module is configured, the IO module related registers are configured, and the IO characteristic configuration of the GPU DVO signal is completed.

[0063] When the GPU graphics card is running, the display frequency and power supply voltage of the GPU graphics card will change. In this case, the current display frequency and power supply voltage of the GPU graphics card are read in real time during the operation of the GPU graphics card, the voltage range of the current power supply voltage is calculated, and the current display frequency and power supply voltage range are compared with the previous display frequency and power supply voltage range to determine whether the current display frequency and power supply voltage range have changed. If there is a change, the optimal IO drive capability level is found according to the board model of the GPU graphics card, the changed display frequency and power supply voltage range, and the IO module is reconfigured to achieve real-time configuration of IO characteristics.

[0064] See also Figure 2 , a device for automatically configuring the IO characteristics of a GPU digital display signal provided by the present invention, mainly includes an IO characteristic configuration module and an onboard Flash, and the IO characteristic configuration module includes a monitoring control module.

[0065] The monitoring control module is used to read the power supply voltage, display frequency and board model of the GPU graphics card after power-on reset or detection of a hot plug signal; and match the IO drive capability level from a preset mapping table of the board Flash according to the power supply voltage, display frequency and board model of the GPU graphics card, wherein the mapping table stores a mapping relationship between the power supply voltage range, display frequency and board model of the GPU graphics card and the IO drive capability level;

[0066] The IO characteristic configuration module is used to configure the IO module according to the matched IO driving capability level and the lower circuit level standard of the GPU digital display signal.

[0067] Among them, the device provided by the present invention also includes a voltage monitoring module, a DVO control module and a QSPI control module, and the IO characteristic configuration module also includes a voltage register, a frequency register, a board model register, a drive capability register and a level standard register.

[0068] See also Figure 3The working process of the device for automatically configuring the IO characteristics of the GPU digital display signal provided by the present invention includes:

[0069] S1: System reset or hot plug HPD detected. HPD signal is used as the basis for determining whether to connect the display device for signal transmission. When the display is plugged in, HPD will send a high level pulse to notify that a new device is connected. When the device is unplugged, the HPD signal will become low level, indicating that the device is disconnected.

[0070] S2: The monitoring control module accesses the voltage detection module through the on-chip bus to read the current power supply voltage V0 and calculates the voltage range V0 of the power supply voltage at this time, accesses the DVO control module to read the current display frequency F0, and reads the board model S0 written with the board in the Flash through the QSPI control module; writes V0, F0, S0 into the voltage register, frequency register and board model register for storage.

[0071] S3: The monitoring control module accesses the onboard Flash through the QSPI control module, and reads the corresponding drive capability level and the lower circuit level standard according to the current power supply voltage range, display frequency and board model value in the voltage register, frequency register and board model register. The drive capability level and the lower circuit level standard are written into the drive capability register and the level standard register for storage.

[0072] S4: The DVO IO characteristic configuration module configures the IO module related registers according to the values ​​in the drive capability register and the level standard register to complete the configuration of the DVO IO characteristic.

[0073] S5: The monitoring control module accesses the voltage monitoring module and the DVO control module again through the bus, reads the power supply voltage V1 and the display frequency F1 at this time, and calculates the voltage range V1 of the power supply voltage at this time.

[0074] S6: The monitoring control module completes the comparison between V1 and the value of the voltage register, and between F1 and the value of the frequency register. If they are all equal, it will wait for 10ms and then jump back to S5; if one is not equal, it will jump to step S7.

[0075] S7: Write V1 and F1 read in step S6 into the voltage register and frequency register, and jump back to S3.

[0076] The lower-level circuit of GPU DVO is an interface conversion chip (which converts the DVO interface into other interfaces) or a display device. Different display devices and interface conversion chips have different interface level standards. At the same time, the characteristic impedance and wiring length of different boards (cables) are also different, and the requirements for driving capabilities are also different. Too small IO driving capability causes the signal to rise too slowly and the voltage swing becomes smaller, which may cause the display to be unable to be driven; too large IO driving capability may introduce noise, thereby reducing signal quality and increasing power consumption. The same GPU chip has different adaptation conditions on different boards. In order to adapt to various application scenarios, multiple driver versions are required. This process increases the workload of software engineers, consumes a lot of time, and also reduces production efficiency. In addition, the IO driving capability cannot change with the change of display resolution, and the optimal match cannot be achieved.

[0077] The present invention provides a method for automatically configuring the IO characteristics of a GPU digital video output, which improves the adaptive ability of a GPU DVO interface in different boards and different application scenarios, achieves the best output effect, and reduces power consumption as much as possible. The level standard, IO driving capability and other information of a GPU downstream interface or a display device are stored in an onboard Flash, the power supply voltage and display frequency are monitored in real time, and the optimal IO characteristics are automatically configured according to the voltage and frequency, so as to ensure the optimal matching between the GPU and the downstream interface chip or the display device, while avoiding the consistency problem of the driver on different boards.

[0078] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0079] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0080] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for automatically configuring GPU digital display signal IO characteristics, characterized in that: include: After power-on reset or hot-plug signal detection, read the power supply voltage, display frequency and board model of the GPU graphics card; According to the power supply voltage, display frequency and board model of the GPU graphics card, the IO driving capability level is matched from a preset mapping table, wherein the mapping table stores a mapping relationship between the power supply voltage range, display frequency and board model of the GPU graphics card and the IO driving capability level; Configure the IO module according to the matched IO drive capability level and the lower circuit level standard of the GPU digital display signal.

2. The method for automatically configuring GPU digital display signal IO characteristics according to claim 1, characterized in that: The configuration of the mapping table includes: In the test phase, the IO drive capability range is determined according to the length of the GPU graphics card DVO signal winding line and the display frequency of the connected display device. All IO drive capability gears are traversed within the IO drive capability range to find the optimal IO drive capability level of the GPU graphics card of this board model at this display frequency. The optimal IO drive capability level means that the display content of the display device is clear and the display power consumption is minimal. Traverse and find the optimal IO drive capability level for all models of boards and all display frequencies; According to the difference between the power supply voltage of the GPU graphics card and the standard voltage, the optimal IO driving capability level is adjusted to obtain the mapping relationship between the power supply voltage range, display frequency, board model and IO driving capability level of the GPU graphics card.

3. The method for automatically configuring GPU digital display signal IO characteristics according to claim 2, characterized in that: The step of adjusting the optimal IO driving capability level according to the difference between the power supply voltage of the GPU graphics card and the standard voltage includes: When the power supply voltage of the GPU graphics card is lower than the standard voltage, the IO drive capability level is increased; conversely, when the power supply voltage of the GPU graphics card is higher than the standard voltage, the IO drive capability level is reduced.

4. The method for automatically configuring GPU digital display signal IO characteristics according to claim 1, characterized in that: The IO module is configured according to the matched IO driving capability level and the lower circuit level standard of the GPU digital display signal, and then further includes: Read the current display frequency and current power supply voltage of the current GPU graphics card in real time, and calculate the voltage range of the power supply voltage, compare the current display frequency and current power supply voltage range with the previous display frequency and power supply voltage range, and determine whether the voltage range of the current display frequency and current power supply voltage has changed; If there is any change, find the optimal IO drive capability level according to the GPU graphics card model, the changed display frequency and the power supply voltage range, and reconfigure the IO module.

5. A device for automatically configuring GPU digital display signal IO characteristics, characterized in that: It includes an IO characteristic configuration module and an onboard Flash, wherein the IO characteristic configuration module includes a monitoring control module; The monitoring control module is used to read the power supply voltage, display frequency and board model of the GPU graphics card after power-on reset or detection of a hot plug signal; and match the IO drive capability level from the preset mapping table of the onboard Flash according to the power supply voltage, display frequency and board model of the GPU graphics card, wherein the mapping table stores a mapping relationship between the power supply voltage range, display frequency and board model of the GPU graphics card and the IO drive capability level; The IO characteristic configuration module is used to configure the IO module according to the matched IO driving capability level and the lower circuit level standard of the GPU digital display signal.

6. The device for automatically configuring GPU digital display signal IO characteristics according to claim 5, characterized in that: The device also includes a voltage monitoring module, a DVO control module and a QSPI control module; The monitoring control module is used to read the power supply voltage, display frequency and board model of the GPU graphics card after power-on reset, including: The monitoring control module accesses the voltage monitoring module through the on-chip bus to read the current power supply voltage V0, accesses the DVO control module to read the current display frequency F0, and reads the board model S0 written with the board in the onboard Flash through the QSPI control module.

7. The device for automatically configuring GPU digital display signal IO characteristics according to claim 6, characterized in that: The IO characteristic configuration module also includes a voltage register, a frequency register, a board model register, a drive capability register and a level standard register; the IO drive capability level is matched from the preset mapping table of the onboard Flash according to the power supply voltage, display frequency and board model of the GPU graphics card, including: The monitoring control module calculates the power supply voltage interval V0 according to the current power supply voltage V0 of the GPU graphics card read, and stores the power supply voltage interval V0, the current display frequency F0 and the board model S0 in the voltage register, the frequency register and the board model register respectively; The monitoring control module accesses the onboard Flash through the QSPI control module, and reads the corresponding driving capability level and the lower circuit level standard of the GPU digital display signal in the mapping table of the onboard Flash according to the current power supply voltage interval V0, display frequency F0 and board model S0 values ​​in the voltage register, frequency register and board model register; The driving capability level and the lower circuit level standard of the GPU digital display signal are written into the driving capability register and the level standard register for storage.

8. The device for automatically configuring GPU digital display signal IO characteristics according to claim 7, characterized in that: The IO characteristic configuration module is used to configure the IO module according to the matched IO driving capability level and the lower circuit level standard of the GPU graphics card, including: The IO characteristic configuration module configures the IO module related registers according to the IO driving capability level in the driving capability register and the level standard register and the level standard of the lower circuit to complete the configuration of the DVO IO characteristic.

9. The device for automatically configuring GPU digital display signal IO characteristics according to claim 5, characterized in that: The monitoring and control module is also used for: At regular intervals, the voltage monitoring module and the DVO control module are accessed again through the bus to read the power supply voltage V1 and the display frequency F1 at that time and calculate the voltage interval V1 of the power supply voltage at that time; The power supply voltage interval V1 is compared with the value V0 of the voltage register, and the display frequency F1 is compared with the value F0 of the frequency register. If V1=V0 and F1=F0, wait for the next reading; If V1≠V0 or F1≠F0, the read power supply voltage V1 and display frequency F1 are written into the voltage register and frequency register, and the IO module is reconfigured.

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