Server BMC management interface display circuit, server system interface display circuit and server

Abstract

The utility model provides a server BMC (baseboard management controller) management interface display circuit, a server system interface display circuit and a server, and belongs to the field of servers, the BMC management interface display circuit is characterized in that a first signal output end of a BMC is connected with a VGA (video graphics array) display through a system interface display circuit and a VGA interface; a second signal output end of the BMC is connected with the USB to VGA chip; a first video input end and a video output end of the video switching chip are connected in series in the system interface display circuit; the output end of the USB to VGA chip and the GPIO of the BMC are connected with the second video input end and the control end of the video switching chip; the jumper cap is used for gating the second pin of the connector to the first pin or the third pin of the connector. And the server system interface display circuit corresponds to the BMC management interface display circuit. And a system interface display circuit is integrated in the server. The BMC management interface is convenient for operators to control and display during on-site maintenance and management.

Description

Technical Field

[0001] The utility model relates to the field of servers, and in particular to a server BMC management interface display circuit, a server system interface display circuit and a server. Background Art

[0002] With the rapid development of cloud computing and big data technology, the information and intelligentization trend of the current society is accelerating. As the core equipment of the information system, the server has the characteristics of high performance and strong I / O expansion capability.

[0003] As we all know, BMC usually refers to Baseboard Management Controller, which is an indispensable part of modern server, data center equipment, network equipment and other hardware systems. BMC is a dedicated microcontroller located on the motherboard, which is used to monitor and manage the system's hardware status, health, power management, heat dissipation, fault detection and reporting, etc. BMC provides a unified infrastructure monitoring and management interface, allowing administrators to remotely access and control, perform server hardware diagnosis, firmware upgrades, power control (startup, shutdown, restart), troubleshooting and other operations.

[0004] The display interfaces (VGA / HDMI / DP, etc.) of servers on the market are mainly used to display the system interface. Specifically, the server's BMC is integrated with a graphics card, and the PCH (Platform Controller Hub) sends the system display data to the BMC through the PCIe bus. The VGA (Video Graphics Array) signal output by the BMC first passes through the Buffer chip (buffer chip) and then is output to the server's local external display through the VGA interface for display. The BMC server currently supports two VGA interfaces, the front window right ear panel and the rear window (the rear window VGA interface is integrated on the server's motherboard), which can display the system interface separately or simultaneously. The BMC management interface can be viewed by logging into the server BMC's Web through other computer devices in the LAN, which is convenient for operators to remotely monitor and manage server equipment, but it is not convenient for on-site operation and maintenance scenarios. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a method of adding a function of displaying a BMC management interface locally to a server, so that operators can conveniently view the BMC management interface locally when performing on-site maintenance management.

[0006] In the first aspect, the technical solution of the utility model provides a server BMC management interface display circuit, the display circuit includes: a server BMC, a VGA interface, a VGA display and a system interface display circuit of the server; the first signal output end of the server BMC is connected to the input end of the VGA interface through the system interface display circuit, the output end of the VGA interface is connected to the VGA display, and the first signal output end is used to output the system interface VGA signal; the display circuit also includes a video switching chip and a USB to VGA chip;

[0007] The second signal output terminal of the server BMC is connected to the input terminal of the USB to VGA chip through the USB bus, and the second signal output terminal is used to output the display data of the BMC management interface;

[0008] The video switching chip includes a first video input terminal, a second video input terminal, a video output terminal and a control terminal; the first video input terminal and the video output terminal are connected in series in the system interface display circuit; the output terminal of the USB to VGA chip is connected to the second video input terminal, and the GPIO output terminal of the server BMC is connected to the control terminal;

[0009] The display circuit also includes a connector and a jumper cap, wherein the connector includes pin 1, pin 2 and pin 3, the jumper cap is used to selectively connect pin 2 to pin 1 or pin 3, pin 3 is grounded, pin 2 is connected to both the control end and the GPIO output end, and pin 2 is connected to a pull-up power supply U via a pull-up resistor R.

[0010] Furthermore, the jumper cap defaults to connecting pin 1 and pin 2, the default working mode of the GPIO output end of the server BMC is OD mode, and the GPIO output end of the server BMC outputs a high level by default.

[0011] Further, the VGA interface is a VGA connector on the right ear plate of the front window of the server, which is recorded as a first VGA connector;

[0012] The system interface display circuit includes a first buffer chip, a front window right ear plate connector on the server mainboard, and a CONN connector on the front window right ear plate;

[0013] The input end of the first Buffer chip is connected to the first signal output end; the output end of the first Buffer chip is connected to the first video input end; the input end of the front window right ear plate connector is connected to the video output end, the output end of the front window right ear plate connector is connected to the CONN connector, and the output end of the CONN connector is connected to the VGA display through the first VGA connector.

[0014] Further, the VGA interface is a VGA connector on the server motherboard, denoted as a second VGA connector;

[0015] The system interface display circuit includes a second buffer chip;

[0016] The input end of the second buffer chip is connected to the first signal output end;

[0017] The output end of the second Buffer chip is connected to the first video input end;

[0018] An input end of the second VGA connector is connected to the video output end;

[0019] The output end of the second VGA connector is connected to the VGA display.

[0020] Furthermore, the video switching chip adopts a Video Switch chip.

[0021] Furthermore, the pull-up power supply U is a 3.3V power supply.

[0022] In a second aspect, the utility model provides a server system interface display circuit, which includes: a server BMC, a VGA display and a first display circuit; the first display circuit includes a VGA connector on a right ear plate of a front window of the server, which is recorded as a first VGA connector; the first display circuit also includes a first Buffer chip, a right ear plate connector on a front window of the server mainboard, and a CONN connector on the right ear plate of the front window; a first signal output end of the server BMC is connected to an input end of the first Buffer chip; an output end of the right ear plate connector of the front window is connected to the CONN connector, and an output end of the CONN connector is connected to the VGA display through the first VGA connector; the first signal output end is used to output a system interface VGA signal;

[0023] The server system interface display circuit also includes a video switching chip, a USB to VGA chip, a connector and a jumper cap, wherein:

[0024] The video switching chip includes a first video input terminal, a second video input terminal, a video output terminal and a control terminal; the second signal output terminal of the server BMC is connected to the input terminal of the USB to VGA chip through a USB bus, and the second signal output terminal is used to output the display data of the BMC management interface; the output terminal of the USB to VGA chip is connected to the second video input terminal, and the output terminal of the first Buffer chip is connected to the first video input terminal; the input terminal of the front window right ear plate connector is connected to the video output terminal, the output terminal of the front window right ear plate connector is connected to the CONN connector, and the output terminal of the CONN connector is connected to the VGA display through the first VGA connector; the GPIO output terminal of the server BMC is connected to the control terminal;

[0025] The connector includes pin 1, pin 2 and pin 3. The jumper cap is used to select pin 2 to be connected to pin 1 or pin 3. Pin 3 is grounded. Pin 2 is connected to the control end and the GPIO output end. Pin 2 is connected to the pull-up power supply U through a pull-up resistor R.

[0026] Furthermore, the server system interface display circuit further includes a second display circuit;

[0027] The second display circuit includes a VGA connector on the server motherboard, which is referred to as the second VGA connector. The second display circuit also includes a second Buffer chip. The first signal output end of the server BMC is connected to the input end of the second VGA interface through the second Buffer chip, and the output end of the second VGA interface is connected to the VGA display.

[0028] Furthermore, the first video input terminal and the video output terminal of the video switching chip are changed from being connected in series between the output terminal of the first Buffer chip and the input terminal of the front window right ear plate connector to being connected in series between the output terminal of the second Buffer chip and the input terminal of the second VGA connector; the output terminal of the first Buffer chip is connected to the input terminal of the front window right ear plate connector through the first video input terminal and the video output terminal of the video switching chip, and is changed to being connected to the output terminal of the first Buffer chip and the input terminal of the front window right ear plate connector.

[0029] In a third aspect, the utility model provides a server, in which the server system interface display circuit described in the above aspects is integrated.

[0030] Compared with the prior art, the utility model has the following beneficial effects:

[0031] The utility model adds a USB bus expansion VGA chip on the basis of the existing technical solution, and adds a video switching chip to switch the VGA signal source output to the VGA interface. On the basis of retaining the original VGA interface and functions, the function of locally displaying the BMC management interface is added, so that the operator can control the server to switch the display system interface and the BMC management interface when performing on-site maintenance and management.

[0032] The utility model has reliable design principle, simple structure and very broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a schematic diagram of a server BMC management interface display circuit of an embodiment of the utility model;

[0035] Figure 2 It is a schematic diagram of a BMC management interface display circuit of another embodiment of the utility model;

[0036] Figure 3 A schematic diagram of a BMC management interface display circuit according to another embodiment of the present utility model;

[0037] Figure 4 It is a schematic diagram of a server system interface display circuit of an embodiment of the utility model;

[0038] Figure 5 is a schematic diagram of a server system interface display circuit of another embodiment of the utility model;

[0039] Figure 6 is a schematic diagram of a server system interface display circuit of another embodiment of the utility model;

[0040] Figure 7 It is a schematic block diagram of a server according to an embodiment of the utility model.

[0041] Among them: 100, server BMC, 200, USB to VGA chip, 300, connector, 400, system interface display circuit, 401, first Buffer chip, 402, front window right ear plate connector, 403, CONN connector, 404, second Buffer chip, 500, video switching chip, 600, VGA interface, 700, VGA display, 800, first display circuit, 900, second display circuit. DETAILED DESCRIPTION

[0042] In order to make the technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments.

[0043] The following description of at least one exemplary embodiment is merely illustrative and is not intended to limit the present invention and its application or use. Based on the embodiments of 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.

[0044] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0045] It should be noted that the present invention uses the words "first", "second" and the like to limit the corresponding parts only for the convenience of distinguishing the corresponding parts. If not otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0046] The technical solution of the utility model will be introduced and explained through several embodiments.

[0047] Please refer to Figure 1 , which shows a schematic diagram of a server BMC management interface display circuit provided by an embodiment of the utility model.

[0048] The server BMC management interface display circuit provided in this embodiment includes: a server BMC 100 , a VGA interface 600 , a VGA display 700 , and a server system interface display circuit 400 .

[0049] The server BMC 100 has a first signal output terminal and a second signal output terminal.

[0050] The first signal output terminal is used to output a system interface VGA signal.

[0051] The second signal output terminal is used to output display data of the BMC management interface.

[0052] The first signal output terminal of the server BMC 100 is connected to the input terminal of the VGA interface 600 through the system interface display circuit 400 .

[0053] It should be noted that the server BMC 100 outputs the system interface VGA signal to the system interface display circuit 400 through the first signal output terminal.

[0054] The server BMC management interface display circuit provided in this embodiment further includes a video switching chip 500 and a USB to VGA chip 200 .

[0055] The second signal output terminal of the server BMC 100 is connected to the input terminal of the USB to VGA chip 200 through the USB bus.

[0056] When in use, the server BMC 100 outputs the display data of the BMC management interface to the input end of the USB to VGA chip 200 through the second signal output end.

[0057] The USB to VGA chip 200 is used to convert the display data outputted from the second signal output terminal into a VGA signal.

[0058] In this embodiment, the video switching chip 500 includes a first video input terminal (corresponding to Figure 1 B in the figure), the second video input terminal (corresponding to Figure 1 C in the video output terminal (corresponding to Figure 1 A in the middle) and the control end (corresponding to Figure 1 in SEL).

[0059] The first video input terminal and the video output terminal of the video switching chip 500 are connected in series in the system interface display circuit 400. The output terminal of the USB to VGA chip 200 is connected to the second video input terminal of the video switching chip 500, and the GPIO output terminal of the server BMC is connected to the control terminal of the video switching chip 500. The control terminal of the video switching chip 500 is used to select one of the video input sources of the first video input terminal and the second video input terminal for output. The video output terminal of the video switching chip 500 is connected to the input terminal of the VGA interface 600, and the output terminal of the VGA interface 600 is connected to the VGA display 700.

[0060] The server BMC management interface display circuit provided in this embodiment also includes a connector 300 and a jumper cap (not shown in the drawings, and can be easily implemented by those skilled in the art based on the text of this specification and the drawings). Figure 1 As shown, the connector 300 includes pin 1, pin 2 and pin 3. Pin 3 is grounded, pin 2 is connected to the control terminal and the GPIO output terminal, and pin 2 is connected to the pull-up power supply U through a pull-up resistor R. The jumper cap is used to connect pin 1 with pin 2, or to connect pin 2 with pin 3. That is, the jumper cap is used to selectively connect pin 2 to pin 1 or pin 3.

[0061] In this embodiment, the jumper cap connects pin 1 and pin 2 by default, the default working mode of the GPIO output end of the server BMC 100 is the OD mode, and the GPIO output end of the server BMC 100 outputs a high level by default.

[0062] When it is necessary to switch to the display of the BMC management interface, the GPIO of BMC100 can be controlled to output a low level or the jumper cap can be changed to connect pins 2 and 3 of connector 300, both of which can output a low level to the control end of the video switching chip 500. At this time, the video switching chip 500 selects the second video input end (corresponding to the CA path in the video switching chip 500), thereby switching the VGA display 700 to the display of the BMC management interface.

[0063] It should be noted that, in the present embodiment, only by connecting the jumper cap to pin 1 and pin 2 of the connector 300 and controlling the GPIO of the BMC100 to output a high level, can a high level be output to control the video switching chip 500 to select the first video input terminal (corresponding to the BA path in the video switching chip 500), and then control the VGA display 700 to switch to the display of the system interface.

[0064] The utility model adds a USB to VGA chip to complete the flexible expansion of display through the USB bus, which is used to output the display data of the BMC management interface, and is simple to implement and low in cost. In specific implementation, other bus expansion solutions can also be replaced according to different situations.

[0065] The utility model adds a Video Switch chip to switch the VGA signal output to the VGA display, and controls the source gating of the VGA signal by controlling the high and low levels of the SEL pin of the Video Switch chip.

[0066] The utility model supports switching of the display interface by means of a jumper cap, which is convenient for users to select a suitable control mode according to on-site conditions. The operation is simple and convenient, and helps to improve efficiency.

[0067] In this embodiment, the pull-up power source U is a 3.3V power source, and the video switch chip 500 adopts a Video Switch chip. The following Table 1 is a schematic table of the switching control level of the video switch chip 500.

[0068] Table 1 Switching control levels of the video switching chip 500

[0069]

[0070] In Table 1, the BMC GPIO column represents the output level of the GPIO output terminal that controls BMC100 ("0" is a low level, "1" is a high level), and the SEL pin column represents the input level of the control terminal (i.e., the controlled terminal) of the video switching chip 500 ("0" is a low level, "1" is a high level); in the column of connector pins selected by the jumper cap: "1-2" represents that the jumper cap connects pin 1 and pin 2 of the connector 300; "2-3" represents that the jumper cap connects pin 2 and pin 3 of the connector 300.

[0071] Optionally, the VGA interface 600 is a VGA connector on the right ear plate of the front window of the server, and the system interface display circuit 400 includes a first buffer chip 401, a right ear plate connector 402 on the front window of the server mainboard, and a CONN connector 403 on the right ear plate of the front window. Figure 2 The VGA connector on the right ear plate of the server front window is marked as the first VGA connector.

[0072] The input end of the first Buffer chip 401 is connected to the first signal output end, the output end of the first Buffer chip 401 is connected to the first video input end, the input end of the front window right ear plate connector 402 is connected to the video output end, the output end of the front window right ear plate connector 402 is connected to the CONN connector 403 (the front window right ear plate connector 402 and the CONN connector 403 are plugged together), and the output end of the CONN connector 403 is connected to the VGA display 700 through the first VGA connector.

[0073] In this embodiment, BMC100, video switching chip 500, USB to VGA chip 200, connector 300, first Buffer chip 401, front window right ear board connector 402, pull-up resistor R and pull-up power supply U are all integrated on the main board of the server; CONN connector 403 and the first VGA connector are all integrated on the front window right ear board of the server.

[0074] Optionally, the VGA interface 600 is a VGA connector on a server motherboard, which is referred to as a second VGA connector; the system interface display circuit 400 includes a second buffer chip 404, such as Figure 3 shown.

[0075] In this embodiment, the second VGA connector corresponds to the VGA interface of the rear window supported by the BMC server in the background technology.

[0076] In this embodiment, the input end of the second Buffer chip 404 is connected to the first signal output end, the output end of the second Buffer chip 404 is connected to the first video input end, the input end of the second VGA connector is connected to the video output end, and the output end of the second VGA connector is connected to the VGA display 700.

[0077] In this embodiment, the BMC 100 , the video switching chip 500 , the USB to VGA chip 200 , the connector 300 , the second buffer chip 404 , the second VGA connector, the pull-up resistor R and the pull-up power supply U are all integrated on the mainboard of the server.

[0078] The utility model also provides a server system interface display circuit, such as Figure 4 As shown, the server system interface display circuit includes: a server BMC 100, a VGA display 700 and a first display circuit 800. The first display circuit 800 includes a VGA connector on the right ear plate of the front window of the server, which is recorded as a first VGA connector. The first display circuit 800 also includes a first buffer chip 401, a right ear plate connector 402 on the server mainboard, and a CONN connector 403 on the right ear plate of the front window.

[0079] The server system interface display circuit also includes a video switching chip 500, a USB to VGA chip 200, a connector 300 and a jumper cap.

[0080] The video switching chip 500 includes a first video input terminal (ie, terminal B), a second video input terminal (ie, terminal C), a video output terminal (ie, terminal A), a GPIO output terminal, and a control terminal (ie, SEL pin).

[0081] The GPIO output terminal of the server BMC is connected to the control terminal.

[0082] The connector 300 includes pin 1, pin 2 and pin 3. The jumper cap is used to selectively connect pin 2 to pin 1 or pin 3, pin 3 is grounded, pin 2 is connected to the control end and the GPIO output end, and pin 2 is connected to the pull-up power supply U through a pull-up resistor R.

[0083] The first signal output terminal of the server BMC 100 is connected to the input terminal of the first buffer chip 401 , and the output terminal of the first buffer chip 401 is connected to the first video input terminal.

[0084] The second signal output terminal of the server BMC is connected to the input terminal of the USB to VGA chip 200 through the USB bus, and the output terminal of the USB to VGA chip 200 is connected to the second video input terminal. The second signal output terminal is used to output display data of the BMC management interface.

[0085] The video output terminal of the video switching chip 500 is connected to the input terminal of the front window right ear plate connector 402 .

[0086] The output end of the front window right ear plate connector 402 is connected to the CONN connector 403 , and the output end of the CONN connector 403 is connected to the VGA display 700 through the first VGA connector.

[0087] Preferably, the server system interface display circuit further includes a second display circuit 900, such as Figure 5 The second display circuit 900 includes a VGA connector on the server motherboard, which is referred to as a second VGA connector; the second display circuit 900 also includes a second buffer chip 404. The first signal output end of the server BMC is connected to the input end of the second VGA interface through the second buffer chip 404, and the output end of the second VGA interface is connected to the VGA display 700.

[0088] Optionally, the first video input and video output of the video switch chip 500 are connected in series between the output of the first buffer chip 401 and the input of the front window right ear plate connector 402, instead of being connected in series between the output of the second buffer chip 404 and the input of the second VGA connector; the output of the first buffer chip 401 is connected to the input of the front window right ear plate connector 402 through the first video input and video output of the video switch chip 500, instead of being connected to the input of the front window right ear plate connector 402. Figure 6 shown.

[0089] In this embodiment, the output end of the first Buffer chip 401 connected to the first video input end is replaced by the output end of the second Buffer chip 404 connected to the first video input end, and the input end of the front window right ear plate connector 402 connected to the video output end is replaced by the input end of the second VGA connector connected to the video output end.

[0090] The utility model also provides a server, in which the server system interface display circuit described in any one of the above embodiments is integrated. Figure 7 shown.

[0091] The same and similar parts between the various embodiments in this specification can be referenced to each other.

[0092] Although the utility model is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the utility model is not limited thereto. Without departing from the spirit and essence of the utility model, ordinary technicians in the field can make various equivalent modifications or substitutions to the embodiments of the utility model, and these modifications or substitutions should be within the scope of the utility model / any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A server BMC management interface display circuit, the display circuit comprising: Server BMC, VGA interface, VGA display and server system interface display circuit; The first signal output end of the server BMC is connected to the input end of the VGA interface through the system interface display circuit, the output end of the VGA interface is connected to the VGA display, and the first signal output end is used to output the system interface VGA signal; characterized in that the display circuit also includes a video switching chip and a USB to VGA chip; The second signal output terminal of the server BMC is connected to the input terminal of the USB to VGA chip through the USB bus, and the second signal output terminal is used to output the display data of the BMC management interface; The video switching chip includes a first video input terminal, a second video input terminal, a video output terminal and a control terminal; the first video input terminal and the video output terminal are connected in series in the system interface display circuit; the output terminal of the USB to VGA chip is connected to the second video input terminal, and the GPIO output terminal of the server BMC is connected to the control terminal; The display circuit also includes a connector and a jumper cap, wherein the connector includes pin 1, pin 2 and pin 3, the jumper cap is used to selectively connect pin 2 to pin 1 or pin 3, pin 3 is grounded, pin 2 is connected to both the control end and the GPIO output end, and pin 2 is connected to a pull-up power supply U via a pull-up resistor R.

2. The server BMC management interface display circuit according to claim 1, characterized in that: By default, the jumper cap connects pin 1 and pin 2. The default working mode of the GPIO output end of the server BMC is OD mode, and the GPIO output end of the server BMC outputs a high level by default.

3. The server BMC management interface display circuit according to claim 1, characterized in that: The VGA interface is the VGA connector on the right ear plate of the server front window, which is recorded as the first VGA connector; The system interface display circuit includes a first buffer chip, a front window right ear plate connector on the server mainboard, and a CONN connector on the front window right ear plate; The input end of the first Buffer chip is connected to the first signal output end; the output end of the first Buffer chip is connected to the first video input end; the input end of the front window right ear plate connector is connected to the video output end, the output end of the front window right ear plate connector is connected to the CONN connector, and the output end of the CONN connector is connected to the VGA display through the first VGA connector.

4. The server BMC management interface display circuit according to claim 1, characterized in that: The VGA interface is a VGA connector on the server motherboard, denoted as the second VGA connector; The system interface display circuit includes a second buffer chip; The input end of the second buffer chip is connected to the first signal output end; The output end of the second Buffer chip is connected to the first video input end; An input end of the second VGA connector is connected to the video output end; The output end of the second VGA connector is connected to the VGA display.

5. The server BMC management interface display circuit according to claim 1, characterized in that: The video switching chip uses a Video Switch chip.

6. The server BMC management interface display circuit according to claim 1, characterized in that: The pull-up power supply U is a 3.3V power supply.

7. A server system interface display circuit, the server system interface display circuit comprising: Server BMC, VGA display and first display circuit; The first display circuit includes a VGA connector on the right ear plate of the front window of the server, which is denoted as the first VGA connector; the first display circuit also includes a first Buffer chip, a front window right ear plate connector on the server mainboard, and a CONN connector on the front window right ear plate; the first signal output end of the server BMC is connected to the input end of the first Buffer chip; the output end of the front window right ear plate connector is connected to the CONN connector, and the output end of the CONN connector is connected to the VGA display through the first VGA connector; the first signal output end is used to output a system interface VGA signal; it is characterized in that the server system interface display circuit also includes a video switching chip, a USB to VGA chip, a connector and a jumper cap, wherein: The video switching chip includes a first video input terminal, a second video input terminal, a video output terminal and a control terminal; the second signal output terminal of the server BMC is connected to the input terminal of the USB to VGA chip through a USB bus, and the second signal output terminal is used to output the display data of the BMC management interface; the output terminal of the USB to VGA chip is connected to the second video input terminal, and the output terminal of the first Buffer chip is connected to the first video input terminal; the input terminal of the front window right ear plate connector is connected to the video output terminal, the output terminal of the front window right ear plate connector is connected to the CONN connector, and the output terminal of the CONN connector is connected to the VGA display through the first VGA connector; the GPIO output terminal of the server BMC is connected to the control terminal; The connector includes pin 1, pin 2 and pin 3. The jumper cap is used to select pin 2 to be connected to pin 1 or pin 3. Pin 3 is grounded. Pin 2 is connected to the control end and the GPIO output end. Pin 2 is connected to the pull-up power supply U through a pull-up resistor R.

8. The server system interface display circuit according to claim 7, characterized in that: The server system interface display circuit further includes a second display circuit; The second display circuit includes a VGA connector on the server motherboard, which is referred to as the second VGA connector. The second display circuit also includes a second Buffer chip. The first signal output end of the server BMC is connected to the input end of the second VGA interface through the second Buffer chip, and the output end of the second VGA interface is connected to the VGA display.

9. The server system interface display circuit according to claim 8, characterized in that: The first video input terminal and the video output terminal of the video switching chip are connected in series between the output terminal of the first buffer chip and the input terminal of the front window right ear plate connector, and are changed to be connected in series between the output terminal of the second buffer chip and the input terminal of the second VGA connector; The output end of the first Buffer chip is connected to the input end of the front window right ear plate connector through the first video input end and the video output end of the video switching chip, and the output end of the first Buffer chip is connected to the input end of the front window right ear plate connector instead.

10. A server, characterized in that: The server system interface display circuit described in any one of 7-9 is integrated therein.

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