JP3097132B2 - Test program / test standard table converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test program / test standard table converter capable of generating a test standard table from a test program downloaded to an LSI tester, and more particularly to a test standard capable of reproducing a test program. The present invention relates to a test program / test standard conversion device that can obtain a table by inverting a table from a test program.

[0002]

2. Description of the Related Art An LSI tester is a device that supplies a signal for measuring the performance or the like to an input terminal of an LSI and checks a signal from an output terminal to judge the quality of the LSI to be measured. These series of operations are performed based on a test program downloaded to an LSI tester. This test program is generated based on a test standard table created so that the test setting state and the like can be easily viewed.

[0003]

Such a test program often needs to be changed due to various factors such as the standard and type of the LSI to be measured. Conventionally, when it is desired to change a test program, it is determined whether or not the change has been correctly made by checking the modified test program with an LSI
The tester is loaded on the tester to operate the LSI tester for confirmation, and the test program cannot be modified or debugged efficiently.

[0004] The present invention has been made in view of the above points, and is intended to convert test information described in a modified or changed test program into a test standard table without losing the test information. It is an object of the present invention to provide a test program / test standard table conversion device capable of easily and efficiently checking whether a test program has been corrected and debugged correctly based on a test standard table.

[0005] A test program / test standard table conversion apparatus capable of reversely converting a test program to be downloaded to an LSI tester into a test standard table, which checks the syntax of the test program and analyzes the test program for easy processing. Syntactic analysis means for converting to an intermediate source, one-line conversion means for dividing the intermediate source obtained by this syntax analysis into a range that can be described in one line of the test standard table, and according to the contents of the intermediate source divided by this one-line conversion means Test standard table conversion means for simulating the setting state of the tester and outputting the result to the test standard table, and confirming the correction of the test program based on the test standard table obtained by the test standard table conversion means It is characterized by being able to do.

[0006]

The components of the present invention operate as follows. The syntax analysis means analyzes the syntax of the test program input from the tester, and converts the test program into an intermediate source.

The one-line conversion means divides the intermediate source within a range that can be described in one line of the test standard table so as not to lose the test information.

[0008] The test standard table conversion means outputs the intermediate source divided for each line by the one-line conversion means to the test standard table.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory diagram of a configuration of a test program / test standard table conversion apparatus according to an embodiment of the present invention. Here, the entire configuration of an LSI tester system is shown. In the figure, reference numeral 1 denotes a data input section for inputting data of a test standard table, and 2 denotes a work station, which is connected to a tester 4 via a bus 3.

In the work station 2, reference numeral 21 denotes automatic program generation means, which downloads a test program automatically generated based on data from the data input unit 1 to the tester 4 via the bus 3. Do. The test program loaded on the tester 4 is modified by a terminal 41 provided on the tester 4 side, and is transferred from the tester 4 to the syntax analysis means 22 provided in the work station 2.

The syntax analyzer 22 checks the syntax of the test program after the correction, analyzes the syntax, and converts the test program into a format (intermediate source) that can be easily processed later.

Reference numeral 23 denotes one-line conversion means, and the syntax analysis means 22
The intermediate source of the test program obtained as described above is divided within a range that can be described in one row of the test standard table so as not to lose test information.

Reference numeral 24 denotes a test standard table conversion unit which converts the intermediate source divided by one line by the one-line conversion unit 23 into a test standard table.

Here, the test standard table is created as shown in FIG. 2, and one test is entered for each line. In one test, a standard value, a measurement condition, a delay time, a judgment operation expression, a setting operation expression, and a pin condition can be described.
Test is described. It should be noted that the numbers enclosed with a circle in the test standard table indicate the classification shown in FIG. 5 later.

FIG. 3 shows a test program corresponding to the test standard table shown in FIG. * TNO. 1, 2,... Correspond to test numbers 1, 2,... In the test standard table, and one section separated by a horizontal line corresponds to one test in the test standard table. An example in which the comparison is made so as to be easily understood using the numbers of the classifications 1 to 3 is shown for the test number 3.

FIG. 4 is a flowchart for explaining an operation of reversely converting a test program of the test program / test standard table conversion apparatus of the present invention into a test standard table. The syntactic analysis means 22 is provided by the tester.
The syntax of the test program transferred to the test program is checked, analyzed, and converted into a format (intermediate source) that can be easily processed later (step (1)).

The one-row conversion means 23 divides the intermediate source into a test standard table so as not to drop test conditions described in the test program when the intermediate source is converted into a test standard table within a range which can be described in one row of the test standard table (step ( 2)).

The test standard table conversion means 24 simulates the setting state of the tester in accordance with the contents of the one-line converted intermediate source (step (3)) and, based on the simulation result, the test standard table. The test condition described in one line is output to the test standard table (step (4)).

Steps (3) to (4) are repeated for each row of the test standard table of the intermediate source to complete the test standard table. If parallel simultaneous measurement is performed to reduce the measurement time, output to the test specification table (step (4)
) Sometimes it is necessary to output on multiple lines.

FIG. 5 is an explanatory diagram specifically showing a rule for converting the intermediate source into one line. The statements of the test program can be classified into the following, and when described in the order of..., They can be converted into one line.

Setting formula (when calculation is required to specify test conditions) Setting of test conditions (setting of signals to be applied to devices) Waiting time (time required for setting of tester and device) Measurement (tester Judgment formula (when calculation is required to obtain the judgment value from the measurement result) Judgment (pass / fail judgment)

FIG. 6 is a flowchart for explaining the operation of the one-row conversion means described in FIG. If there is no previously described statement, that is, if the statement is the first in the test program, the immediately preceding statement is set to none (step (10)). Statement 1 is read from the intermediate source (step (11)).

If this statement cannot be read at the end of the program, the one-line conversion ends here (step (12)). When the statement 1 can be read, the read statement 1 judges one of the following classifications (step (13)).

The statement 1 whose classification is determined can be described on the basis of the rule of FIG. 5 as to whether it can be described in the row of the test standard table together with the statement 0 read immediately before (step (14)). For example, if there is no immediately preceding statement, statement 1 may be any of the following, but if statement 0 is a classification, statement 1 is one of the classifications. Otherwise, they cannot be described on one line.

If it cannot be described in one row of the test standard table, the test program is divided before the read statement 1 (step (15)). For example, the TNO of FIG.
6 corresponds to this example. If it can be described in one row of the test specification table, the classification of statement 1 is held as the classification immediately before statement 2 to be read next (step (16)). This function can also be applied to a tool for converting test programs between testers of different models.

[0026]

As described above in detail, the test program / test standard table conversion apparatus of the present invention converts test information described in a test program into one line to form a complete test standard table. It can be converted. For this reason, the value as a document is high, and the test program can be debugged and modified based on the test standard table.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory diagram of a test program / test standard table conversion device of the present invention.

FIG. 2 is a test standard table of the test program / test standard table conversion device of the present invention.

FIG. 3 is a test program corresponding to the test standard table shown in FIG. 2;

FIG. 4 is a flowchart illustrating an operation of reversely converting a test program into a test standard table of the test program / test standard table conversion device of the present invention.

FIG. 5 is an explanatory diagram specifically showing a rule for converting an intermediate source into one line.

FIG. 6 is a flowchart for explaining the operation of the one-row conversion means described in FIG. 5;

[Explanation of symbols]

 22 Syntax analysis means 23 One line conversion means 24 Test standard table conversion means

Claims (1)

(57) [Claims] 1. A test program / test standard table conversion device capable of inverting a test program to be downloaded to an LSI tester into a test standard table, comprising:
Parsing means for parsing and converting to an intermediate source which is easy to process; one-line converting means for dividing the intermediate source obtained by the parsing means within a range which can be described in one line of the test standard table; And a test standard table conversion unit that simulates a setting state of the tester in accordance with the contents of the divided intermediate source and outputs the result to the test standard table . Check for test program modifications based on the test specification table
A test program / test standard table conversion device characterized by the ability to: