CN107515834A - A USB interface supporting LCD liquid crystal screen and interface configuration method - Google Patents

Abstract

The present invention provides a kind of USB interface and interface allocation method for supporting LCD liquid crystal displays, and the USB interface includes server end USB females interface and LCD ends USB male joint interface；The signal of each pin transmission is respectively VBUS, D, D+, P GND, SCL, SDA, Present, S GND and Rst signals corresponding to described server end USB females interface and LCD ends USB male joint interface；Pin corresponding to described SCL, SDA, Present and Rst signal is connected with server end BMC, and pin corresponding to described D and D+ signals is connected with server end PCH；Pin corresponding to the Present signals of the LCD ends USB male joint interface connects pull-up resistor.The present invention is by the way that most common USB3.0 interfaces definition in server is modified, it is set to be originally used for the data-signal for supporting the stitch of USB3.0 high-speed transfers to be revised as supporting LCD liquid crystal displays, realize server end USB interface for LCD liquid crystal displays and the compatibility of USB2.0 equipment, reach the multi-purpose effect of a bite, product versatility is improved, great convenience has been used with after-sales service band for client.

Description

A USB interface supporting LCD liquid crystal screen and interface configuration method

technical field

The invention relates to the technical field of computer communication, in particular to a USB interface supporting an LCD liquid crystal screen and an interface configuration method.

Background technique

In recent years, with the rapid development of the server market, its target customers have gradually become diversified, and the functional requirements of different customers for the server are also changing. With the continuous development of LCD liquid crystal technology, the application of LCD liquid crystal screens in The server has also become the general trend. Applying the LCD screen to the server, the running status and fault information of the server can be displayed on the LCD screen through the data communication between the LCD screen and the server, which is convenient for users to use and maintenance personnel to quickly locate faults.

At present, the support interfaces of LCD screens by server manufacturers are basically RS232 interfaces, and the controller inside the LCD screen communicates with the server through the RS232 protocol. As shown in Figure 1, the LCD screen is connected to the RS232 interface on the server through a cable, and the LCD controller communicates with the controller on the main board of the server and analyzes the corresponding control signals, and then sends data to the LCD screen for display. on the LCD screen.

Since the current support for the server is limited to the RS232 interface on the server motherboard, when the server is not equipped with this interface, it is difficult to realize the data communication between the LCD screen and the server.

Contents of the invention

The purpose of the present invention is to provide a USB interface and an interface configuration method that supports LCD liquid crystal screens, so that the server no longer only relies on the RS232 interface for the support of the LCD liquid crystal screen, and the most common USB3.0 interface in the server can realize the LCD interface. The support of the LCD screen brings great convenience to customers' use and after-sales maintenance.

In order to achieve the above-mentioned technical purpose, the present invention provides a USB interface that supports an LCD liquid crystal screen, and the USB interface includes a server-side USB female interface and an LCD-side USB male interface;

The signals transmitted by the respective pins corresponding to the server-side USB female interface and the LCD-side USB male interface are VBUS, D-, D+, P-GND, SCL, SDA, Present, S-GND and Rst signals; The corresponding pins of the SCL, SDA, Present and Rst signals are connected to the server-side BMC, and the corresponding pins of the D- and D+ signals are connected to the server-side PCH;

The pin corresponding to the Present signal of the USB male interface at the LCD end is connected to a pull-up resistor.

Preferably, the USB female interface on the server side and the USB male interface on the LCD side are connected by an I2C signal.

Preferably, the BMC is connected to the server-side USB female interface by an I2C signal, and the LCD-side USB male interface is connected to the LCD controller by an I2C signal.

Preferably, the server-side USB female interface is also connected with a drive voltage module and a switch module, the drive voltage module generates a corresponding drive voltage according to the type of the external plug-in device monitored by the server-side BMC, and the switch module generates a corresponding drive voltage according to the The driving voltage generated by the driving voltage module connects the USB interface to the server-side BMC or server-side PCH for data transmission.

The present invention also provides a kind of USB interface configuration method that supports LCD liquid crystal screen:

Change the transmission signals STDA_SSRX-, STDA_SSRX+, STDA_SSTX- and STDA_SSTX+ that support USB3.0 data transmission in the USB interface of the server side and the USB interface of the LCD side to SCL, SDA, Present and Rst signals respectively, and maintain the transmission that supports USB2.0 data transmission The signal remains unchanged; the pin corresponding to the Present signal in the USB interface of the LCD end is connected to a pull-up resistor;

The pins corresponding to the SCL, SDA, Present and Rst signals of the server-side USB interface are respectively connected to the server-side BMC, and the corresponding pins of the D- and D+ signals supporting USB2.0 data transmission are respectively connected to the server-side PCH.

Preferably, the USB interface on the LCD side and the USB interface on the server side are connected by an I2C signal.

Preferably, an I2C signal connection is used between the LCD-side USB interface and the LCD controller; and an I2C signal connection is used between the server-side USB interface and the server-side BMC.

Preferably, when the USB interface at the LCD end is connected to the USB interface at the server end, when the server-end BMC detects that the Present signal is in a high level state, the server-end BMC establishes a communication connection with the LCD end; when the USB2.0 device is connected to the server When the USB interface of the terminal is connected, the BMC of the server monitors that the Present signal is in a low-level state, and drives the PCH of the server to establish a communication connection with the USB2.0 device.

The effects provided in the summary of the invention are only the effects of the embodiments, rather than all the effects of the invention. One of the above technical solutions has the following advantages or beneficial effects:

Compared with the prior art, the present invention modifies the definition of the most common USB3.0 interface in the server, so that the pin originally used to support USB3.0 high-speed transmission is modified to support the data signal of the LCD liquid crystal screen, through The modified signal transmission method enables the server to establish an I2C communication connection with the LCD screen, while the pin transmission signal mode originally used to support USB2. Compatible with USB2.0 devices. It achieves the effect of multi-purpose in one bite, improves the versatility of the product, and brings great convenience to customers' use and after-sales maintenance.

Description of drawings

FIG. 1 is a schematic diagram of a connection mode between a server and an LCD liquid crystal screen in the prior art;

Fig. 2 is the data transmission schematic diagram of the server end USB3.0 interface provided in the embodiment of the present invention;

Fig. 3 is the data transmission schematic diagram of the USB3.0 interface of LCD liquid crystal screen end provided in the embodiment of the present invention;

FIG. 4 is a schematic diagram of a data transmission method between the server end and the LCD end provided in the embodiment of the present invention.

detailed description

In order to clearly illustrate the technical features of the present solution, the present invention will be described in detail below through specific implementation methods and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed. It should be noted that components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted herein to avoid unnecessarily limiting the present invention.

A USB interface supporting an LCD liquid crystal screen and an interface configuration method provided by an embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings.

The embodiment of the present invention provides a USB interface supporting an LCD liquid crystal screen.

Since the main board of the server is generally equipped with multiple USB interfaces, in the embodiment of the present invention, the front USB interface of the server is selected for data communication with the LCD liquid crystal screen, which is convenient for users to view.

Usually, the interface definition of the standard USB3.0 is shown in Table 1.

Table 1

Since USB3.0 is backward compatible with version 2.0, a 9-pin design is adopted, and the shape and definition of the four pins are exactly the same as those of USB2.0, which transmit VBUS (power supply), D-(USB2.0 data- ), D+ (USB2.0 data +) and GND (ground) signals, there are four pins to transmit STDA_SSRX- (USB3.0 receive data-), STDA_SSRX+ (USB3.0 receive data +), STDA_SSTX- (USB3 .0 send data-) and STDA_SSTX+ (USB3.0 send data +) signals are used to accelerate the transmission of USB3.0, and the pin GND_DRAIN (ground wire) is used for signal interruption and electronic interference.

In order that the USB3.0 interface can support the LCD liquid crystal screen, the interface definition is modified, as shown in Table 2.

Table 2

The VBUS, D-, D+ and P-GND signals are the same as the definitions before modification, so USB2.0 devices can be supported. The VBUS, P_GND, SCL, SDA, Present, S_GND and Rst signals are effective signals for the LCD function. USB2.0 function and LCD function multiplex power signal and ground signal.

As shown in Figure 2, on the server side, the pins transmitting the SCL, SDA, Present and Rst signals in the USB3.0 interface are connected to the BMC (Baseboard Management Controller, Baseboard Management Controller), and the BMC is connected to the main board or the front control board of the server. The USB female interface is connected through the I2C signal, so as to realize the data communication between the BMC and the LCD screen. The D- and D+ signals are connected to the PCH (Platform Controller Hub, Intel's integrated south bridge), that is, data communication with the USB2.0 device is performed through the PCH.

In addition, the server-side USB female interface is also connected with a driving voltage module and a switch module. The driving voltage module generates a corresponding driving voltage according to the type of the external device monitored by the server-side BMC. The driving voltage generated by the module connects the USB interface to the server-side BMC or server-side PCH for data transmission.

As shown in Figure 3, in the USB3.0 interface on the LCD screen side, a pull-up resistor is connected to the pin that transmits the Present signal, while the pin in the standard USB3.0 interface is GND, which is used for external communication on the server motherboard. Plug in the device type for online monitoring. The controller in the LCD screen is connected to the USB male interface on the LCD screen through the I2C signal.

As shown in Figure 4, when the LCD screen is connected to the USB3.0 interface on the main board of the server, the BMC can detect that the Present signal is pulled high, that is, monitor the presence signal of the LCD screen, and then establish I2C communication with the LCD screen ; When the standard USB2.0 device is connected to the USB3.0 interface on the server motherboard, the BMC detects that the Present signal is low, and thus monitors that the LCD screen is not in place, so it does not establish I2C communication with the standard USB3.0 device.

The above-mentioned modification to the USB3.0 interface definition makes the pin originally used to support USB3.0 high-speed transmission modified to support the data signal of the LCD liquid crystal screen. Through the modified signal transmission method, the server end and the LCD liquid crystal screen are established. The I2C communication connection is added, and the pin transmission signal mode originally used to support USB2.0 data transmission remains unchanged, so that the server-side USB interface is compatible with LCD screens and USB2.0 devices. It achieves the effect of multi-purpose in one bite, improves the versatility of the product, and brings great convenience to customers' use and after-sales maintenance.

The embodiment of the present invention also provides a method for configuring a USB interface supporting an LCD liquid crystal screen, including:

First configure the USB interface on the server side: modify the signals STDA_SSRX-, STDA_SSRX+, STDA_SSTX- and STDA_SSTX+ in the standard USB3.0 interface on the server side that support USB3.0 data transmission to SCL, SDA, Present and Rst signals to support USB2.0 The pin transmission signal for data transmission remains unchanged, so the modified USB3.0 interface is defined as: VBUS, D-, D+, P-GND, SCL, SDA, Present, S-GND and Rst signals. The pins for transmitting SCL, SDA, Present and Rst signals are connected to BMC, and the pins for transmitting D- and D+ signals supporting USB2.0 data transmission are connected to PCH.

Then configure the USB3.0 interface on the LCD screen side: connect the pin that transmits the Present signal in the standard USB3.0 interface on the LCD side to a pull-up resistor, and determine the type of signal connection through the detection of the Present signal by the server-side BMC.

When the USB port on the LCD side is connected to the USB port on the server side, and the BMC on the server side monitors that the Present signal is in a high level state, the BMC on the server side establishes a communication connection with the LCD side; when the USB2.0 device is connected to the USB port on the server side, The server-side BMC detects that the Present signal is in a low-level state, and drives the server-side PCH to establish a communication connection with the USB2.0 device.

There is an I2C signal connection between the USB interface on the LCD side and the USB interface on the server side. The USB interface at the LCD end is connected with the LCD controller by an I2C signal; the USB interface at the server end is connected with the BMC by an I2C signal.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (8)

1. a kind of USB interface for supporting LCD liquid crystal displays, it is characterised in that the USB interface connects including server end USB females Mouth and LCD ends USB male joint interface；

The signal of each pin transmission is respectively corresponding to described server end USB females interface and LCD ends USB male joint interface VBUS, D-, D+, P-GND, SCL, SDA, Present, S-GND and Rst signal；Described SCL, SDA, Present and Rst letter Pin corresponding to number is connected with server end BMC, and pin corresponding to described D- and D+ signals is connected with server end PCH；

Pin corresponding to the Present signals of the LCD ends USB male joint interface connects pull-up resistor.

A kind of 2. USB interface for supporting LCD liquid crystal displays according to claim 1, it is characterised in that described server end Connected between USB females interface and LCD ends USB male joint interface for I2C signals.

A kind of 3. USB interface for supporting LCD liquid crystal displays according to claim 1, it is characterised in that the server end BMC is that I2C signals are connected with server end USB females interface, the LCD ends USB male joint interface and lcd controller I2C signals Connection.

4. a kind of USB interface for supporting LCD liquid crystal displays according to claim 1-3 any one, it is characterised in that described Server end USB female interfaces are also associated with driving voltage module and switch module, and the driving voltage module is according to server Driving voltage corresponding to the type generation for the extrapolation equipment that end BMC is monitored, the switch module is according to the driving voltage mould USB interface is connected to driving voltage caused by block into server end BMC or server end PCH carries out data transmission.

5. a kind of USB interface collocation method for supporting LCD liquid crystal displays, it is characterised in that by server end USB interface and LCD ends Transmission signal STDA_SSRX-, STDA_SSRX+, STDA_SSTX- and STDA_ of USB3.0 data transfers are supported in USB interface SSTX+ is respectively modified as SCL, SDA, Present and Rst signal, keeps supporting that the transmission signal of USB2.0 data transfers is constant； Pin corresponding to Present signals in the USB interface of the LCD ends is connected into pull-up resistor；

Pin corresponding to SCL, SDA, Present and Rst signal of the server end USB interface respectively with server end BMC Connection, pin corresponding to D- the and D+ signals of USB2.0 data transfers is supported to be connected respectively with server end PCH.

A kind of 6. USB interface collocation method for supporting LCD liquid crystal displays according to claim 5, it is characterised in that LCD ends Connected between USB interface and server end USB interface for I2C signals.

A kind of 7. USB interface collocation method for supporting LCD liquid crystal displays according to claim 5, it is characterised in that LCD ends Connected between USB interface and lcd controller for I2C signals；It is I2C between server end USB interface and the server end BMC Signal connects.

8. a kind of USB interface collocation method for supporting LCD liquid crystal displays according to claim 5-7 any one, its feature It is, when the USB interface of the USB interface access server side at LCD ends, the server end BMC monitors Present signals During in high level state, server end BMC is established with LCD ends and communicated to connect；As the USB of USB2.0 equipment access server sides During interface, the server end BMC monitors that Present signals are in low level state, drives the server end PCH and institute State USB2.0 equipment and establish communication connection.