CN111221492A - Backboard bus type multi-unit server VGA display design device and design method - Google Patents
Backboard bus type multi-unit server VGA display design device and design method Download PDFInfo
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- CN111221492A CN111221492A CN202010030022.8A CN202010030022A CN111221492A CN 111221492 A CN111221492 A CN 111221492A CN 202010030022 A CN202010030022 A CN 202010030022A CN 111221492 A CN111221492 A CN 111221492A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
- G06F3/1446—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display display composed of modules, e.g. video walls
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
Abstract
The invention discloses a backboard bus type multi-unit server VGA display design device and method, and belongs to the technical field of computer display. The invention discloses a backboard bus type multi-unit server VGA display design device, which comprises N computing units, a KVM switching unit, a backboard input unit, a backboard output unit, a flexible board and an interface board, wherein the N computing units respectively input VGA signals to the KVM switching unit through the backboard input unit, the KVM switching unit outputs the VGA signals to an external interface through the backboard, the flexible board and the interface board, and N is not less than 2. The backboard bus type multi-unit server VGA display design device can effectively improve VGA display quality, avoids display problems such as water ripples and double images, and has good popularization and application values.
Description
Technical Field
The invention relates to the technical field of computer display, and particularly provides a backboard bus type multi-unit server VGA display design device and a design method.
Background
VGA (video Graphics array), a video Graphics array, is the most common computer display standard at present, transmits red, green and blue analog signals and line and field synchronous signals, has the advantages of fast display speed, rich colors, bright colors and the like, and almost all middle and low-end computer equipment supports VGA interfaces. However, because the VGA red, green and blue signals are analog signals, they are easily interfered by high frequency from other signals and medium and low frequency from the reference ground plane, and the common problems of VGA display water ripple, ghost, flicker and blur are all related to signal interference. In a backboard bus plug-in board type multi-unit server, VGA signals are large in number, complex in switching and long in transmission distance, cross-board transmission is carried out through a connector for multiple times, the interference problem is serious, and the display quality problem is easily caused.
Disclosure of Invention
The technical task of the invention is to provide a backboard bus type multi-unit server VGA display design device which can effectively improve VGA display quality and avoid display problems of water ripple, ghost image and the like aiming at the problems.
The invention further provides a backboard bus type multi-unit server VGA display design method.
In order to achieve the purpose, the invention provides the following technical scheme:
a back panel bus type multi-unit server VGA display design device comprises N computing units, a KVM switching unit, a back panel input unit, a back panel output unit, a flexible board and an interface board, wherein the N computing units respectively input VGA signals to the KVM switching unit through the back panel input unit, the KVM switching unit outputs the VGA signals to an external interface through the back panel, the flexible board and the interface board, and N is not less than 2.
The method for realizing the VGA display design of the back panel bus type multi-unit server by the VGA display design device of the back panel bus type multi-unit server comprises the design of VGA signal reference ground multi-stage isolation, VGA signal routing envelope, independent reference ground plane and the like, can effectively reduce the noise interference of the VGA signal reference ground, reduce the crosstalk of other high-frequency digital signals to the VGA signal and ensure the VGA signal quality.
Preferably, there is only one group of VGA signals in each computing unit, and N groups of VGA signals realize one-to-many switching through the KVM switch unit.
Preferably, the VGA reference ground in each computing unit is not isolated, and is uniformly referenced to a common GND, so that the VGA wiring reference GND is ensured to be complete.
Preferably, the backplane input unit is a VGA input side, has N groups of VGA signals, and isolates the reference GND of the VGA signals respectively.
Preferably, the KVM switch unit includes N VGA input signals and one VGA output signal, isolates the common AGND, and is connected to GND in a single-point manner by using a 0 Ω resistor.
Preferably, the backplane output unit, the flexible board and the interface board form an output link of the VGA signal, and the AGND _ VGA is isolated from the GND section by a single-point connection mode and serves as a reference ground of the VGA output signal.
A back panel bus type multi-unit server VGA display design method is realized based on a back panel bus type multi-unit server VGA display design device and comprises VGA signal reference ground multi-level isolation design, VGA signal routing envelope design and independent reference ground plane design, and full link and system level isolation protection is carried out on VGA signals.
Preferably, adjacent layers of the VGA analog signal line are independently laid, an AGND reference plane is completed, and the AGND network is used for carrying out envelope processing on the VGA signal.
Compared with the prior art, the backboard bus type multi-unit server VGA display design method has the following outstanding beneficial effects: the back plate bus type multi-unit server VGA display design method has the advantages that through the design of VGA signal reference ground multistage isolation, VGA signal routing envelope, independent reference ground plane and the like, VGA signal reference ground noise interference can be effectively reduced, crosstalk of other high-frequency digital signals to VGA signals is reduced, VGA signal quality is guaranteed, and the back plate bus type multi-unit server VGA display design method has good popularization and application values.
Drawings
FIG. 1 is a VGA transmission and switching flow chart for an embodiment of a backplane bus type multi-unit server VGA display design method according to the present invention;
FIG. 2 is a diagram of a VGA link reference AGND isolation design architecture using an embodiment of the backplane bus type multi-unit server VGA display design apparatus of the present invention;
FIG. 3 is a schematic diagram illustrating AGND envelope design of a backboard VGA analog R/G/B signal in the backboard bus type multi-unit server VGA display design method according to the present invention;
FIG. 4 is a schematic diagram of AGND envelope design of VGA analog R/G/B signal of flexible board in the backboard bus type multi-unit server VGA display design method of the present invention.
Detailed Description
The backplane bus type multi-unit server VGA display design apparatus and design method of the present invention will be described in detail with reference to the accompanying drawings and embodiments.
Example 1
The back board bus type multi-unit server VGA display design device comprises N computing units, a KVM switching unit, a back board input unit, a back board output unit, a flexible board and an interface board, wherein the N computing units respectively input VGA signals to the KVM switching unit through the back board input unit, the KVM switching unit outputs the VGA signals to an external interface through the back board, the flexible board and the interface board, and N is not less than 2.
Only one group of VGA signals is arranged in each computing unit, and N groups of VGA signals realize one-to-one switching through the KVM switching unit. The VGA reference ground in each computing unit does not need to be isolated, and is uniformly referenced to the common GND, so that the VGA wiring is ensured to be complete with reference to the GND.
The backboard input unit is a VGA input side, has N groups of VGA signals, and respectively isolates the reference GND of the VGA signals.
The KVM switching unit internally comprises N groups of VGA input signals and one group of VGA output signals, isolates the shared AGND, and adopts a 0 omega resistor to carry out single-point connection with the GND.
The back board output unit, the flexible board and the interface board form an output link of the VGA signal, and the AGND _ VGA is isolated on GND by the link section in a single-point connection mode and serves as a reference ground of the VGA output signal.
The method for realizing the VGA display design of the back panel bus type multi-unit server by the VGA display design device of the back panel bus type multi-unit server comprises the design of VGA signal reference ground multi-stage isolation, VGA signal routing envelope, independent reference ground plane and the like, can effectively reduce the noise interference of the VGA signal reference ground, reduce the crosstalk of other high-frequency digital signals to the VGA signal and ensure the VGA signal quality.
The VGA display design device of the backplane bus multi-unit server according to the present invention is described below by taking a design based on a two-unit server as an example:
as shown in fig. 1, one embodiment is designed based on a two-unit server, which adopts a CPCI bus architecture and includes a computing unit 1 and a computing unit 2, a KVM switch unit, a backplane, a flexible board, and an interface board. VGA signals of the computing unit 1 and the computing unit 2 enter the KVM switching unit through the backboard, are converted into two signals and one signal, and are output to the external interface through the backboard, the flexible board and the interface board.
As shown in fig. 2, only one group of VGA signals are provided inside the computing unit 1 and the computing unit 2, and the routing distance is short, the VGA reference ground does not need to be isolated, and the VGA routing reference GND needs to be uniformly referred to the common GND, which is required to be ensured to be complete.
Two groups of VGA signals SV1_ VGA and SV2_ VGA are arranged on the input side of the backboard VGA, the transmission distance is long, coupling and interference relations exist between the VGA signals and other high-frequency digital signals, the reference GND of the VGA are respectively isolated, and AGND _ VGA1 and AGND _ VGA2 are connected with GND in a single-point mode through 0 omega resistors, so that noise is fully isolated on the premise of ensuring consistent levels.
VGA1_ IN, VGA2_ IN and VGA _ OUT are arranged IN the KVM switching unit, 3 groups of VGA signals are provided, but a transmission link is short, only common AGND is isolated, and a 0 omega resistor is adopted to carry OUT single-point connection with GND.
The output side of the backboard VGA, the flexible board and the interface board form an output link of the VGA _ OUT signal, the transmission distance is long, the output link is switched by the connector for many times, and the AGND _ VGA is isolated from the section of link on GND in a single-point connection mode and serves as a reference ground of the VGA _ OUT signal.
Example 2
The back board bus type multi-unit server VGA display design method is realized based on the back board bus type multi-unit server VGA display design device.
The method comprises a VGA signal reference ground multi-stage isolation design, a VGA signal routing envelope design and an independent reference ground plane design, and is used for carrying out full-link and system-level isolation protection on VGA signals. Adjacent layers of VGA analog R/G/B signal lines are independently laid to complete an AGND reference plane, and an AGND network is used for enveloping VGA analog R/G/B signals to ensure the completeness and cleanness of the reference plane and isolate interference from other signals. FIG. 3 shows the AGND envelope design of the R/G/B signal in the analog R/G/B signal Layout design of the backplane VGA. As shown in FIG. 4, the AGND envelope design is designed for the VGA analog R/G/B signal of the flexible board.
The above-described embodiments are merely preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a bus-type polycell server VGA display design device of backplate which characterized in that: the KVM switch comprises N computing units, a KVM switch unit, a backboard input unit, a backboard output unit, a flexible board and an interface board, wherein the N computing units respectively input VGA signals to the KVM switch unit through the backboard input unit, the KVM switch unit outputs the VGA signals to an external interface through the backboard, the flexible board and the interface board, and N is not less than 2.
2. The backplane bus type multi-unit server VGA display design device of claim 1, wherein: only one group of VGA signals is arranged in each computing unit, and N groups of VGA signals realize one-to-many switching through the KVM switching unit.
3. The backplane bus type multi-unit server VGA display design device of claim 2, wherein: the VGA reference ground in each computing unit is not required to be isolated, and is uniformly referenced to the common GND, so that the VGA wiring is ensured to be complete with reference to the GND.
4. The device for VGA display design of a backplane bus type multi-unit server according to claim 3, wherein: the backboard input unit is a VGA input side, has N groups of VGA signals, and respectively isolates the reference GND of the VGA signals.
5. The backplane bus type multi-unit server VGA display design device of claim 4, wherein: the KVM switching unit internally comprises N groups of VGA input signals and one group of VGA output signals, isolates the shared AGND, and adopts a 0 omega resistor to carry out single-point connection with the GND.
6. The backplane bus type multi-unit server VGA display design device of claim 5, wherein: the back board output unit, the flexible board and the interface board form an output link of the VGA signal, and the AGND _ VGA is isolated on GND by the link section in a single-point connection mode and serves as a reference ground of the VGA output signal.
7. A backboard bus type multi-unit server VGA display design method is characterized in that: the method is realized based on a VGA display design device of a back panel bus type multi-unit server of any one of claims 1 to 6, and comprises VGA signal reference ground multi-stage isolation design, VGA signal routing envelope design and independent reference ground plane design, and the full-link and system-level isolation protection is carried out on VGA signals.
8. The backplane bus type multi-unit server VGA display design method of claim 7, wherein: and adjacent layers of the VGA analog signal line are independently laid to complete the AGND reference plane, and the AGND network is used for carrying out envelope processing on the VGA signal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112015289A (en) * | 2020-08-28 | 2020-12-01 | 山东超越数控电子股份有限公司 | Computer integrated with KVM (keyboard video mouse) |
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| US20080147922A1 (en) * | 2006-09-29 | 2008-06-19 | June-On Co., Ltd. | Kvm switch |
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Application publication date: 20200602 |