JP2001306046A - Video memory testing and diagnosing method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate easily visualize an abnormal spot by displaying the abnormal spot, while setting completely different values in color information of a LUT(look-up table) of normal places and abnormal places of a video memory. SOLUTION: A video memory testing and diagnosing device 2 for diagnosing the video memory of the graphic device provided with a LUT holding color values is provided with a means 21, which detects the abnormal place of the video memory by reading out arbitrary data written in the vide memory and by comparing data before writing with the data after the read out, a means 23 which registers an arbitrary color value in the LUT according to the arbitrary data and displays the color value a means 22 which registers a color value resulting from inverting the arbitrary color value to the LUT corresponding to the abnormal place of the memory and a means which displays the arbitrary color value and the inverted color value repeatedly and alternately.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video memory test / diagnosis method and apparatus therefor, and more particularly to a video memory test / diagnosis method and an apparatus therefor which allow an abnormal portion of a video memory mounted on a graphic device or the like to be easily visually recognized. .

[0002]

2. Description of the Related Art In a video memory test diagnosis, an address of an abnormal portion is specified, and the cause of the abnormality is analyzed and investigated.
Therefore, in the test diagnosis, data before writing to each address of the video memory is compared with data read after writing, and if the comparison result does not match, the address is regarded as an abnormal point.

[0003] However, the above primitive method is an effective method for individually detecting abnormal points in the video memory, but it is necessary to check the abnormal situation (such as the distribution state of abnormal points) of the entire video memory. Not appropriate for test diagnosis.

Further, even if the data written in the video memory is displayed on the output device, if the difference in the color values is small,
It is difficult to visually recognize it as abnormal.

[0005]

As described above, the conventional video memory test / diagnosis method has a problem that it is difficult to grasp the distribution state of abnormal locations in the video memory.

An object of the present invention is to solve the above-mentioned drawbacks and to set completely different values for color information of LUTs (look-up tables; hereinafter referred to as LUTs) of normal and abnormal locations in a video memory. It is an object of the present invention to provide a video memory test / diagnosis method and an apparatus for displaying and facilitating visual inspection of an abnormal part.

[0007]

According to the video memory test diagnosis method of the present invention, when performing a test diagnosis of a video memory of a graphic device having an LUT for retaining a color value, any data written in the video memory can be tested. The data before reading and writing are compared with the data after reading to detect an abnormal portion of the video memory, and register and display an arbitrary color value in the LUT corresponding to the arbitrary data, and display the video. A color value completely different from the arbitrary color value is registered and displayed in the LUT corresponding to the abnormal portion of the memory.

In the video memory test diagnosis method of the present invention, when performing a test diagnosis of a video memory of a graphic device provided with an LUT for holding a color value, any data written in the video memory is read out before writing. And comparing the read data with the read data to detect an abnormal portion of the video memory, register and display an arbitrary color value in the LUT corresponding to the arbitrary data, and display the abnormal portion of the video memory. The color value obtained by inverting the arbitrary color value is registered and displayed in the LUT corresponding to.

Further, in the video memory test diagnosis method of the present invention, when performing a test diagnosis of a video memory of a graphic device provided with an LUT for holding a color value, any data written in the video memory is read out before writing. And comparing the read data with the read data to detect an abnormal portion of the video memory, register and display an arbitrary color value in the LUT corresponding to the arbitrary data, and display the abnormal portion of the video memory. The color value obtained by inverting the arbitrary color value is registered and displayed in the LUT corresponding to, and the arbitrary color value and the inverted color value are alternately and repeatedly displayed.

The video memory test / diagnosis apparatus of the present invention is a video memory test / diagnosis apparatus for diagnosing a video memory of a graphic device having an LUT for holding a color value. Means for comparing the data before writing and the data after reading to detect an abnormal portion of the video memory, and means for registering and displaying an arbitrary color value in the LUT corresponding to the arbitrary data. A means for registering and displaying a color value completely different from the arbitrary color value in the LUT corresponding to the abnormal portion of the video memory.

The video memory test / diagnosis device of the present invention is a video memory test / diagnosis device for diagnosing a video memory of a graphic device having an LUT for holding a color value. Means for comparing the data before writing and the data after reading to detect an abnormal portion of the video memory, and means for registering and displaying an arbitrary color value in the LUT corresponding to the arbitrary data. Means for registering and displaying a color value obtained by inverting the arbitrary color value in the LUT corresponding to an abnormal portion of the video memory.

Further, the video memory test / diagnosis apparatus of the present invention is a video memory test / diagnosis apparatus for diagnosing a video memory of a graphic device having an LUT for holding a color value, wherein arbitrary data written to the video memory is read. Means for comparing the data before writing and the data after reading to detect an abnormal portion of the video memory, and means for registering and displaying an arbitrary color value in the LUT corresponding to the arbitrary data. Means for registering and displaying a color value obtained by inverting the arbitrary color value in the LUT corresponding to the abnormal part of the video memory; and alternately repeating the arbitrary color value and the inverted color value. Displaying means.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram showing an embodiment of the present invention. Referring to FIG. 1, a graphic device 1 includes a video memory 11 to be tested and diagnosed and an LUT 12 for holding color values to be displayed, and an output device 3 such as a display.
It is connected to the. The video memory test / diagnosis device 2 includes a video memory comparing unit 21, a first LUT changing unit 22, and a second LUT changing unit 23, and is connected to the graphic device 1 and connected to the video memory 11.
Perform test diagnosis.

The video memory comparing means 21 writes an arbitrary value sequentially from the beginning of the video memory area, compares the read value with the written value, and makes a test diagnosis as to whether or not the video memory is normal.

When the video memory 11 is determined to be abnormal in the test diagnosis, the first LUT changing means 22 converts the color value of the LUT corresponding to the video memory value read from the abnormal location to the normal video memory value. The color value of the LUT 12 is changed to an inverted color value.

The second LUT changing means 23 is provided with a first LU
The color value of the LUT 12 changed by the T changing means 22 is changed to a color value of the LUT corresponding to a normal video memory value.

The first LUT changing means 22 and the second LU
The T changing means 23 is repeatedly executed. By doing so, the abnormal portion of the video memory is displayed on the display device with a normal color value blinking.

Next, the operation of the video memory test / diagnosis apparatus will be described.

First, test diagnosis is performed on the video memory area mounted on the graphic device 1 in order from the top. After writing an arbitrary value in the video memory, the video memory comparing means 21 compares the read value with the written arbitrary value. At this time, by registering an arbitrary color value corresponding to a normal video memory value in the LUT 12 in advance, an area corresponding to the video memory 11 determined to be normal by the test diagnosis can be registered in the previously registered arbitrary color value. Are displayed on the output device 3.

In the test diagnosis, if the video memory 11 is determined to be abnormal, the first LUT changing means 22 changes the color value of the LUT 12 corresponding to the video memory value read from the abnormal location to a normal video memory value. The color value of the corresponding LUT is changed to an inverted color value. At this time,
The area corresponding to the video memory 11 determined to be abnormal in the test diagnosis is the LUT 12 corresponding to the normal video memory value.
Are output on the output device 3.

Thereafter, the color value of the LUT 12 changed by the first LUT changing means 22 is changed by the second LUT changing means 23 to the color value of the LUT corresponding to the normal video memory value. At this time, in the area corresponding to the video memory 11 determined to be abnormal in the test diagnosis, the color value of the LUT 12 corresponding to the normal video memory value is displayed on the output device 3.

By repeatedly executing the first LUT changing means 22 and the second LUT changing means 23,
The area corresponding to the video memory 11 determined to be abnormal in the test diagnosis is blinked on the output device 3 because the color value of the LUT 12 is repeatedly changed.

For example, LUT entry 0: black, LUT
Entry 0xff: The procedure for diagnosing the video memory as white is as follows.

(1) An initial value 0 is written in all video memories (for example, memory size: 1M).

(2) Write test data 0xff to all video memories.

(3) Data is checked sequentially from the head of the video memory. Here, the expected value is 0xff.

(4) If an abnormal point is detected by the check and the data in the video memory at this time is 0xfe, the registered value of 0xfe in the LUT is displayed.

(5) By changing the registered value of the LUT alternately, an abnormal portion of the video memory is visually recognized by the output device. Specifically, by setting the registered value of 0xfe of the LUT to red, red and white appear to blink on the output device. Even if there are multiple abnormal locations, each LU
By changing the registered value of T, each abnormal point can be specified.

[0030]

As described above in detail, according to the present invention, an abnormal portion of a video memory can be displayed on an output device in an easily recognizable manner. Therefore, it is easy to investigate the distribution of the abnormal portion of the video memory from the display device after the test diagnosis of all the mounted video memory regions, and it is possible to improve the efficiency of analyzing the cause of the abnormalities of the video memory.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Graphic device 2 Data processing device 3 Output device 11 Video memory 12 LUT 21 Video memory comparison means 22 First LUT change means 23 Second LUT change means

Claims (6)

[Claims] When performing a test diagnosis of a video memory of a graphic device having an LUT holding a color value, an arbitrary data written in the video memory is read, and data before writing is compared with data after reading. Detecting an abnormal portion of the video memory, registering and displaying an arbitrary color value in the LUT corresponding to the arbitrary data, and displaying the arbitrary color value in the LUT corresponding to the abnormal portion of the video memory. A video memory test / diagnosis method, wherein a color value completely different from a color value is registered and displayed. 2. When performing a test diagnosis of a video memory of a graphic device provided with an LUT holding a color value, an arbitrary data written in the video memory is read, and data before writing is compared with data after reading. Detecting an abnormal portion of the video memory, registering and displaying an arbitrary color value in the LUT corresponding to the arbitrary data, and displaying the arbitrary color value in the LUT corresponding to the abnormal portion of the video memory. A video memory test / diagnosis method characterized by registering and displaying a color value whose color value is inverted. 3. When performing a test diagnosis of a video memory of a graphic device having an LUT holding a color value, read arbitrary data written in the video memory, and compare data before writing with data after reading. Detecting an abnormal portion of the video memory, registering and displaying an arbitrary color value in the LUT corresponding to the arbitrary data, and displaying the arbitrary color value in the LUT corresponding to the abnormal portion of the video memory. A video memory test / diagnosis method, wherein a color value whose color value is inverted is registered and displayed, and the arbitrary color value and the inverted color value are alternately and repeatedly displayed. 4. A video memory test / diagnosis device for diagnosing a video memory of a graphic device provided with an LUT for retaining a color value, wherein arbitrary data written in the video memory is read, and data before writing and data after reading are read. Means for detecting an abnormal portion of the video memory, means for registering and displaying an arbitrary color value in the LUT corresponding to the arbitrary data, and corresponding to the abnormal portion of the video memory. Means for registering and displaying a color value completely different from the arbitrary color value in the LUT and displaying the color value. 5. A video memory test / diagnosis device for diagnosing a video memory of a graphic device provided with an LUT for retaining a color value, wherein arbitrary data written in the video memory is read, and data before writing and data after reading are read. Means for detecting an abnormal portion of the video memory, means for registering and displaying an arbitrary color value in the LUT corresponding to the arbitrary data, and corresponding to the abnormal portion of the video memory. A means for registering and displaying a color value obtained by inverting the arbitrary color value in the LUT, and displaying the color value. 6. A video memory test / diagnosis device for diagnosing a video memory of a graphic device provided with an LUT for retaining a color value, wherein arbitrary data written to the video memory is read, and data before writing and data after reading are read. Means for detecting an abnormal portion of the video memory, means for registering and displaying an arbitrary color value in the LUT corresponding to the arbitrary data, and corresponding to the abnormal portion of the video memory. The LUT includes means for registering and displaying a color value obtained by inverting the arbitrary color value, and means for alternately and repeatedly displaying the arbitrary color value and the inverted color value. Video memory test and diagnosis apparatus.