JPH0482097A - Method for rom sum check test - Google Patents

Abstract

PURPOSE:To test the invariable of the contents of a ROM even when the ROM which is not equipped with sum check correction value data inside the ROM is included by providing a correction data table outside the ROM. CONSTITUTION:After the retrieval of a correction data table 20, from the first to the last data designated by a ROM sum check calculation means 40 are read by byte, successively calculated to determine the sum check data of the ROM. When the sum check data does not become 0 and the correction value data is not registered, the correction value of the ROM is determined by a correction data preparation means 30. The correction data preparation means 30 is a means to realize the determination of the correction value where the result of the calculation becomes 0 in the calculation between the sum check data, and the correction value determined here is registered to the correction data table 20 with the position information of the ROM by a correction data table register means 50 to be utilized at a ROM sum check confirmation test from the next time. Thus, the invariability of the ROM is tested.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an RO that confirms the constancy of data contents in a ROM.
Concerning M sum check test method.

[Conventional technology]

The conventional ROM sum check test method reads ROM data one byte at a time and performs calculations sequentially until the last data, and then the correction data is incorporated as the last data so that the calculation result becomes 0. There is. Therefore, the ROM that is the subject of the test performs calculations sequentially without reading data, and the calculation result becomes 0 as expected, including correction data, indicating that the data contents of the ROM have not been changed. was being tested.

[Problem to be solved by the invention]

In the conventional ROM sum check test method described above, only those ROMs that have correction data built in in advance are subject to testing, and for ROMs that do not have this data built in, the data content is immutable. It has the disadvantage that it cannot be tested.Also, since it is not visible from the outside whether this correction data has been incorporated into the ROM, it is difficult to judge whether it can be tested. there were.

[Means to solve the problem]

The ROM sum check test method of the present invention uses a plurality of RO
ROM specifying means for specifying the ROM to be tested from M, R
A correction data table in which OM position information and corresponding correction data are registered; a correction data creation means for newly calculating correction data for a ROM in which no correction data is incorporated; The apparatus includes a ROM sum check calculation means for obtaining sum check data, and a correction data registration means for registering correction value information and position information obtained by the correction data creation means in the correction data table.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a correction data table used in this embodiment. , correction data creation means 30, ROM sum check calculation means 40, and correction data table registration means 5
0, is configured. Further, the test procedure is performed in the directions shown in the processing flow 100 and the data flow 200.

The ROM specifying means 10 is a means for specifying a ROM to be tested from among the ROMs in the system,
The ROM to be tested is determined here. The correction data table 20 is provided to search whether correction data has already been registered for a specified ROM, and as shown in FIG. A table showing correspondence with correction value information 22 is recorded. Based on the ROM information given by the ROM specifying means 10, the position information 21 of this ROM is
, and the ROM specifying means 10 checks whether the specified ROM is registered in the location information 21. Here, if the correspondence between the ROM position information 21 and its correction value information 22 is registered, the value of the correction value information 22 is extracted and stored as correction value data. After searching the correction data table 20, the ROM summation calculation means 40 reads byte by byte from the first data to the last data of the specified ROM, performs calculations sequentially, and calculates the summation data of the specified ROM. seek. It is expected that the sum check data that is the result of this calculation will be 0, but if the above correction value data is stored, the sum check data that is further calculated using this correction value data and the sum check data Alternatively, if the result of the calculation with the correction value is O, the invariance of the data in this ROM is confirmed and the test ends.

On the other hand, if the sum check data does not become O and the correction value data is not registered, the correction value of this ROM is determined by the correction data creation means 30.

The correction data creation means 30 is a means for calculating a correction value such that the calculation result becomes 0 when calculated with the sum check data, and the correction value calculated here is as follows.
The correction data table registration means 50 newly registers the data together with the ROM position information in the correction data table 20, and uses it in the next ROM sum check confirmation test.

Note that the first test result indicates that the correction data has not been registered and ends.

〔Effect of the invention〕

As explained above, the present invention provides a correction data table outside the ROM for the sum check correction data of the ROM, even when the ROM includes a ROM that does not have the sum check correction value data inside the ROM. , it is possible to test the constancy of the contents of the ROM. Also, when testing a certain ROM,
Another advantage is that the test can be performed without being aware of whether or not sum check correction value data is included in R and OM.

[Brief Description of the Drawings] Fig. 1 is a block diagram of an embodiment of the present invention, and Fig. 2 is a block diagram of an embodiment of the present invention.
FIG. 3 is an explanatory diagram showing a correction data table of main parts of the present embodiment. DESCRIPTION OF SYMBOLS 10... ROM specification means, 20... Correction data table, 21... ROM position information, 22... Correction value information, 30... Correction data creation means, 40... ROM
Sum check calculation means, 50... Correction data table registration means, 100... Processing flow, 200... Data flow.

Claims (1)

[Claims] ROM to specify the ROM you want to test from multiple ROMs
a correction data table for registering ROM position information and correction data corresponding thereto; correction data creation means for newly calculating correction data for ROMs in which no correction data is incorporated; ROM sum check calculation means for calculating sum check data of the ROM, and correction data registration means for registering correction value information and position information obtained by the correction data creation means in the correction data table.
M sum check test method.