JPS6341896A - Data transmission system for plasma display - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] A DMA controller is provided for a plasma display that stores and displays data transferred from a video RAM asynchronously with the display cycle, and central control is performed when writing data to the plasma display. A DMA controller under the control of the device transfers data from the video RAM to the plasma display through direct memory access processing, thereby reducing the burden on the central control unit.

[Industrial application field]

The present invention relates to a data transfer method for a plasma display, and more particularly to a data transfer method for a plasma display that reduces the burden on a CPU by transferring data from a video RAM to a plasma display using DMA.

[Conventional technology]

Display devices that include a plasma display and display data stored in a video RAM on the plasma display are known in the art.

FIG. 2 shows the configuration of a conventional plasma display device, in which the plasma display 1 has a memory function and uses its own display cycle to generate plasma on the display surface according to data written in advance. It can be displayed by emitting light.

When rewriting data on the plasma display (FDP) 1, the central processing unit (CPU) 2
reads the data written in the video RAM 3 asynchronously with the display cycle of the plasma display 1 and supplies it to the output device (Do) 5 from the bus 4. As a result, dot data is read from the output device 5 into the plasma display 1 in accordance with the address on the display surface of the plasma display 1. As mentioned above, the plasma display 1 has a memory function, stores this data, and displays the data in its display cycle.

In this case, the central processing unit 2 cannot perform any other processing while transferring the data on the video RAMa to the plasma display l; for example, writing data to the video RAM 3 from a keyboard or other line (not shown). etc. will be stopped.

Display on the plasma display 1 is performed line by line, and data is normally written frame by frame.
This is done by stopping the display of one line. Therefore, if the number of lines is large, it will take a considerable amount of time to rewrite data on the plasma display 1.

[Problem that the invention seeks to solve]

Conventionally, data transfer from the video RAM 3 to the plasma display 1 has been performed through the intervention of the central processing unit 1 as described above. Therefore, while data is being written to the plasma display 1, the central processing unit 2 cannot perform other processing. On the other hand, there is a problem in that it takes a long time to rewrite data in the plasma display 1, and therefore the processing capacity of the central processing unit 2 for performing other processes is inevitably reduced.

[Means for solving problems]

The present invention aims to solve the problems of the prior art, and is directed to a plasma display that has a memory function and stores and displays data transferred from a video RAM asynchronously with the display cycle. Direct
A memory access (DMA) controller is provided.

The DMA controller 1 has the function of controlling direct memory access transfer of data on memory, and transfers data from video RAM to a plasma display by direct memory access under the control of a central control unit (CPU). Transfer data.

[For production]

In the method of the present invention, the data transfer from the video RAM to the plasma display is performed by the DMA controller through direct memory access processing under the control of the central processing unit, so the central processing unit is freed from data transfer processing. , thus reducing the burden on the central processing unit.

〔Example〕

FIG. 1 shows the configuration of an embodiment of the present invention, in which the same parts as in FIG. 2 are designated by the same numbers and their operations are also the same. Reference numeral 6 is added in the present invention, and is a DMA controller that controls direct memory access transfer of data.

In FIG. 1, when data is transferred from the video RAM 3 to the plasma display 1, the central processing unit 2
specifies the address of the video RAM 3 to the DMA controller 6 and instructs the DMA transfer of data at that address.

The DMA controller 6 thereby controls the video RAM 3.
The data at the designated address is read out and input to the output device 5 via the bus 4, whereby dot data is read into the plasma display 1 in correspondence with the address on the display surface of the plasma display 1.

The plasma display 1 has a memory function, stores written data, and displays it by plasma emission according to its own display cycle.

Data writing to the plasma display 1 is normally performed line by line, but is not limited to this, and may be performed for any number of lines or for the entire frame.

〔Effect of the invention〕

As explained above, according to the plasma display data transfer method of the present invention, a DMA controller is provided in a plasma display device that stores and displays data transferred from a video RAM asynchronously with the display cycle. , data can be transferred from the video RAM to the plasma display by DMA processing, thus reducing the burden on the central processing unit that controls the system and improving the processing power for other processes.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a conventional data transfer method for a plasma display. ■-Plasma display 2-Central processing unit (CPU) 3--Video RAM 4-Has 5-Output device (D0) 6-Direct memory access (DMA) controller

Claims (1)

[Claims] Having a memory function, the video R can be processed asynchronously with the display cycle.
For plasma displays that store and display data transferred from AM, a direct memory access (DMA) controller is installed to control direct memory access transfer of data in memory, and a central control unit (CPU) 1.) A data transfer method for a plasma display, wherein the DMA controller transfers data from the video RAM to the plasma display by direct memory access under the control of the following.