JPS61219877A - Automatic testing control system - Google Patents

Abstract

PURPOSE:To constitute a small and inexpensive test apparatus, by preparing a printed circuit board wherein the transmitting and receiving relation of a single direction interface is replaced with respect to a printed circuit board and mounting a test program to said printed circuit board. CONSTITUTION:A printed circuit board 1 to be tested consists of a dual direction interface A part 11, a single directional interface B part 12 and a conversion part 13 for performing interface conversion according to a microprogram. A test printed circuit board 2 having a single directional interface B part 22, wherein transmitting and receiving relation is replaced with respect to the single directional interface B part 12 of the printed circuit board 1 to be tested, is prepared and a test program is mounted on ROM. The printed circuit board 1 to be tested and the test printed circuit board 2 are connected in opposed relationship through both interface parts. By this method, the test of the printed circuit board 1 to be tested can be automatically performed by using an inexpensive and small test apparatus 2.

Description

[Detailed Description of the Invention] [Summary] A testing method for printed circuit boards having both bidirectional and unidirectional interfaces and an interface conversion function using a program control method, in which the printed circuit board under test is
Prepare a printed board that replaces the sending/receiving relationship of the unidirectional interface, load the test program on it, and connect it facing the printed board under test. by this,
By using the printed board's interface function and program control function, a small and inexpensive test device can be provided.

[Industrial Field of Application] The present invention relates to a testing method for printed circuit boards having a microprogram control function.

Currently, a printed circuit board having a function of converting a data transfer method between two interfaces has been realized using a microprogram control method, and is widely used for connecting input/output devices in small computers and the like.

The present invention relates to a test method for automatically testing such printed boards.

[Prior Art] Conventionally, in order to test the above-mentioned printed boards, it has been common to use one of the following two methods.

(1) Test the printed circuit board under test (UUT) in actual operation. In other words, the CPU (
central processing unit) to the unidirectional interface B
(input/output device) as shown in Figure 3(a).
It is tested either as a pair 1 or as an "Imozuru" method as shown in FIG. 3(b).

(2) Test using a dedicated printed board testing machine or a general-purpose printed board testing machine. That is, as shown in Figure 4+81, an input cover turn is generated and the printed board under test (UU
With a so-called function tester, which inputs input into
Alternatively, as shown in FIG. 4(b), signals are input from the leads of each functional component on the printed board using a probe,
Test using a so-called in-circuit tester that measures the output from the leads.

[Problems to be Solved by the Invention] The conventional testing methods (1) and (2) described above have the following problems.

In the method (1) shown in FIG. 3 (al), it is necessary to install a plurality of CPUs as products, and a large floor space is required, which increases the test cost.

In addition, in the method shown in Figure 3 (bl), the cable connection becomes complicated and there is a risk of erroneous operation or erroneous testing due to human error.Furthermore, the output from interface B is Therefore, it is impossible to completely judge whether the quality is good or bad.

Method (2) requires expensive tester equipment, and although this test can detect manufacturing defects and component fixation failures, it cannot detect timing and functional defects under actual operating conditions. It is possible, and after the main test process, it is connected to CPtT to confirm normality.

The present invention aims to provide a new automatic test method that solves these problems.

[Means for Solving the Problems] FIG. 1 shows a block diagram of the principle of the automatic test system of the present invention.

In FIG. 1, reference numeral 1 denotes a printed circuit board under test, which has a bidirectional interface A section and a unidirectional interface section 8, and has a function of converting between the two interfaces under microprogram control.

2 is a printed board for testing, and in terms of hardware,
This is simply the transmission and reception of the eight unidirectional interfaces of the printed board 1 under test, respectively, reversed, and a test program is loaded in the built-in ROM instead of the interface conversion program in the printed board 1 under test.

The printed board to be tested 1 and the printed board for testing 2 are placed one to one.
are connected to each other by a bidirectional interface A and a unidirectional interface B, respectively.

[Operation] The test printed board 2 has a function as a tester for the printed board 1 to be tested by loading a test program into its built-in ROM.

That is, through the interface A, the printed board 1 under test
input a command to interface B, and send the response signal to interface B.
and compare it with the expected value for inspection.

In this way, the conventional method "flows" to the printer or display, and the normality is checked visually, etc., whereas in the tree method, the interface is checked via the actual interface and at the actual speed. Since the expected value of the output is checked, tests with deep diagnostic content are possible.

In addition, compared to the conventional method, manual intervention (cable connection, CP
This eliminates the need for u-operations and visual inspections, making unattended testing possible.

[Example] The gist of the present invention will be specifically explained below with reference to an example shown in FIG.

In FIG. 2, reference numeral 1 denotes a printed board to be tested, which is composed of a bidirectional interface A31511, a unidirectional interface B12, and an interface conversion section 13 that performs interface conversion using a microprogram.

Interface conversion is to convert between the bidirectional bus of the central processing unit 3, indicated by a broken line, and the unidirectional interface of the input/output device 4, also indicated by a broken line, and includes format conversion, code conversion, and timing conversion. It accompanies it.

The interface conversion unit 13 has a ROM that stores an interface conversion program and conversion data, and an SRAM that is loaded with necessary programs and data and that actually performs microprogram control.

2 is a test printed board, and in terms of hardware, the only difference from the printed board under test 1 is that the transmission/reception relationship is replaced with the unidirectional interface 2B section 12, making it a unidirectional interface 2B section 22. have the same configuration.

The ROM of the test circuit section 23 is loaded with a test program in addition to the same program and data as the printed board under test 1, and the necessary programs and data are loaded into the SRAM to provide the function as a test machine. It turns out.

The same program as the printed board 1 to be tested is used to generate expected values during testing.

The printed board under test 1 and the test printed board 2 are connected facing each other through both interfaces.

The test printed circuit board 2 uses interfaces A and B to simulate the function of the CPU (central processing unit) 3 shown in broken lines in FIG. 2, and the DEV (input/output device).
This realizes the simulation function of 4.

[Effects of the Invention] As explained above, according to the present invention, the hardware functions of the printed circuit board under test can be used as is, it is small and inexpensive, and it is flexible enough to easily accommodate changes in the interface by modifying the program. It is possible to provide a highly efficient automatic testing device, and its practical effects are great.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, and FIGS. 3 and 4 are conceptual diagrams of a conventional test method. In the drawings, 1 is a printed board to be tested, 2 is a printed board for testing, 3 is a central processing unit, 4 is an input/output device, and 2 is a professional 7-point fist according to an embodiment of the present invention.

Claims (1)

[Claims] Bidirectional interface A and unidirectional interface B
This is a test method for printed circuit boards equipped with an interface conversion function using a program control method, and the printed circuit board under test (1) is a test printed circuit board in which only the transmission/reception relationship of the unidirectional interface B section is replaced. (
2) is prepared, and the test printed board (2) and the tested printed board (1) are prepared.
) are connected one-to-one through the bidirectional interface A and the unidirectional interface B to diagnose and test the printed board under test (1). .