JP2636669B2 - Connection information detection circuit and connection information detection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection information detection circuit, and more particularly to a connection information detection circuit used in a wiring inspection device for detecting the presence or absence of a connection between terminals of a device to be detected.

[0002]

2. Description of the Related Art In order to check the connection between terminals of a device to be detected having a plurality of terminals, when a test signal is input to a specific terminal, the test signal is output from another terminal. What is necessary is just to detect whether or not it is performed. However, when the number of terminals of the device to be detected reaches several thousands or tens of thousands, it is impractical to perform connection for each specific terminal one by one. Therefore, a connection information detection circuit that efficiently detects the presence or absence of connection to a specific terminal is used.

As shown in FIG. 2, a conventional connection information detecting circuit includes first to M-th input units 211 to 21M each having N connection information input terminals, and these input units 211 to 21M. And first to Mth connection information output units 221 to 22M, respectively. The first to Mth connection information output units 22 are connected to the data bus 23. Note that the input units 211 to 21M
Is limited by the bit width of the data bus 23.

Next, the operation of the connection information detecting circuit will be described. Note that an inspection signal is input to a specific terminal of the device to be detected, and each connection information input terminal of the input units 211 to 21M has a one-to-one correspondence with other terminals except the specific terminal of the device to be detected. It is assumed that they are connected by.

[0005] Connection information indicating the presence or absence of connection is input to each connection information input terminal of the input units 211 to 21M.
Here, it is assumed that the connection information is input as a signal “L” when there is a connection, and as a signal “H” when there is no connection.

The connection information input to the connection information input terminals of the input units 211 to 21M is directly input to the connection information output units 221 to 22M. That is, N pieces of connection information are input to each of the connection information output units 221 to 22M. The connection information output units 221 to 22M transmit these N pieces of connection information to the data bus 23 as N-bit connection information. The connection information output units 221 to 2
The transmission of N-bit connection information from 2M is performed sequentially under the control of a control unit (not shown).

[0007] The N-bit connection information sent to the data bus 23 is input to the control unit. In the control unit, the m-th (1
If the n-th (1 ≦ n ≦ N) bit of the N-bit connection information output from the connection information output unit 22m of (≦ m ≦ M) is a signal “L”, a specific terminal of the detected device is It can be detected that there is a connection between the m-th input unit 21m and the terminal to which the n-th connection information input terminal is connected. For example, if the first and third bits of the N-bit connection information output from the connection information output unit 221 are “L” and the other bits are “H”, the specific terminal of the detected device is It can be seen that there is a connection between the first and third connection information input terminals of the input unit 211. When all the bits of the n-bit connection information output from the connection information output unit 221 are “H”, there is a connection between the specific terminal of the device to be detected and the terminal to which the input unit 211 is connected. You can see that there is no connection.

[0008]

In the conventional connection information detection circuit, the number of data (number of bits N) that can be output at one time from the connection information output circuit is determined by the bit width of the data bus (for example, 1 bit).
6 bits). Therefore, as the number of terminals of the detected device increases, the number M of connection information output circuits increases, and as a result, the number of times data is output from the connection information output circuit to the data bus increases. For this reason, the conventional connection information detection circuit has a problem that the inspection time becomes longer as the number of terminals of the device to be detected increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a connection information detecting circuit in which the influence of an increase in the number of terminals of a device to be detected is suppressed and the inspection time is reduced.

[0010]

According to the present invention, in a connection information detecting circuit for detecting the presence or absence of connection between terminals of a device to be detected having a plurality of terminals, the plurality of terminals are connected to a first terminal.
First to M-th connection information output units that are connected to the plurality of terminals for each of the first to M-th groups and output connection information of each terminal; First to Mth connection information aggregating units that are connected for each of the first to Mth groups and output aggregated connection information indicating whether or not specific information is included in the connection information of each terminal; And a consolidated information output unit that collectively outputs the M pieces of consolidated connection information from the first to Mth connection information aggregating units.

Further, according to the present invention, the first to Mth
The connection information aggregating section and the m-th (1 ≦ m ≦ M) corresponding to the m-th (1 ≦ m ≦ M) connection information aggregating section that activated the connection information aggregating section and the aggregated information output section to obtain the aggregated connection information and output the aggregated connection information indicating that there is a connection A connection information output circuit that starts the connection information output unit and outputs a connection information of all the terminals included in the m-th group.

Further, according to the present invention, in a connection information detecting method for detecting the presence or absence of connection between terminals of a device to be detected having a plurality of terminals, the plurality of terminals may be first to Mth.
It is determined whether or not the connection information indicating that there is connection is included in each group, and only the group including the connection information indicating that connection is included is included in the group. A method for detecting connection information, characterized in that terminal connection information is output.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. The connection information detection circuit according to the present embodiment includes first to Mth input units 111 to 11M each having N connection information input terminals, and first to Mth input units connected to these input units 111 to 11M, respectively. Connection information output units 121 to 12M, first to Mth connection information aggregation units 131 to 13M also connected to the input units 111 to 11M, and first to Mth connection information aggregation units 131 to 13M, respectively. And an integrated information output unit 14 to be connected.

Next, the operation of the connection information detecting circuit will be described. Note that a test signal is input to a specific terminal of the device to be detected, and each connection information input terminal of the input units 111 to 11M has a one-to-one correspondence with other terminals except the specific terminal of the device to be detected. It is assumed that they are connected by.

Connection information indicating the presence or absence of connection is input to each connection information input terminal of each of the input units 111 to 11M.
Here, it is assumed that the connection information is input as a signal “L” when there is a connection, and as a signal “H” when there is no connection.

The connection information input to the connection information input terminals of the input units 111 to 11M is output to connection information output units 121 to 12M and connection information aggregating units 131 to 13M. At this time, the control unit (not shown) operates only the connection information aggregation units 131 to 13M and does not operate the connection information output units 121 to 12M.

The connection information aggregating units 131 to 13M indicate that there is a connection when any one of the N connection information input terminals connected thereto is receiving a signal "L" (specific information). The integrated information is output, and only when the signal “H” is input to all of the N connection information input terminals, is the integrated information indicating no connection. Thus, the connection information aggregating units 131 to 13M convert the N pieces of connection information into 1-bit aggregate information.

The M pieces of aggregated information output from the connection information aggregation units 131 to 13M are input to the aggregated information output unit 14. The aggregate information output unit 14 sends the M aggregate information to the data bus 15 as M-bit aggregate information.

The control unit receives M-bit aggregate information via the data bus 15. When the m-th (1 ≦ m ≦ M) bit of the M-bit aggregate information indicates that there is a connection, the control unit operates the m-th connection information output unit 12m. For example, if the first bit indicates that there is a connection, the connection information output unit 121 is operated. In this way, the control unit operates only the connection information output unit 12m connected to the input unit 11m connected to the connection information aggregation unit 13m that has output the integrated information indicating that there is a connection.

The connection information output unit 12m, which has received the operation command from the control unit, sends out N pieces of connection information to the data bus 23 as N-bit connection information as in the related art. The control unit can detect a terminal connected to a specific terminal of the device to be detected from the N-bit connection information.

Although an actual device to be detected has thousands to tens of thousands of terminals, only one to several tens of terminals are connected to one terminal, which is very small. For this reason, if a plurality of terminals are collectively detected to detect the presence or absence of connection, a result of no connection is often obtained. Therefore, as in the present embodiment, once the aggregated information is output from the aggregated information output unit 14 to the data bus, many terminals that are not connected to a specific terminal can be detected. Many of 121 to 12M do not need to output connection information.
That is, the detection time can be significantly reduced.

The connection information output unit 121 of the above embodiment
Since the number of output bits N of 12M to 12M and the number of output bits M of the aggregated information output unit 14 are limited to the bit width of the data bus 15, the connection information detection circuit of this embodiment has a maximum of N ×
Although only the M terminals can be detected, the connection information can be detected for more terminals by using a plurality of connection information detection circuits at the same time. In this case, it goes without saying that the detection time can be significantly reduced as compared with the conventional connection information detection circuit.

[0023]

According to the present invention, connection information input from the terminals is aggregated for each group and output as aggregated information for the terminals divided into the first to Mth groups.
From the consolidated information, the group that includes the terminal that has a connection with the specific terminal is specified, and the individual connection information of all the terminals is output only for the specified group, so that the connection between the specific terminal and other terminals is possible. Inspection time can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a block diagram of a conventional connection information detection circuit.

[Explanation of symbols]

 111 to 11M input unit 121 to 12M connection information output unit 131 to 13M connection information aggregator 14 aggregated information output unit 15 data bus 211 to 21M input unit 221 to 22M connection information output unit 23 data bus

Claims (3)

(57) [Claims] 1. A connection information detection circuit for detecting presence or absence of connection between terminals of a device to be detected having a plurality of terminals,
A first to an M-th connection information output unit that divides the plurality of terminals into first to M-th groups and is connected to the plurality of terminals for each of the first to M-th groups and outputs connection information of each terminal; When, the same particular information in said plurality of the first to the terminal connected to each Group <br/>-loop of the M connection information of each terminal
First to output aggregated connection information indicating whether or not it is included
A connection information aggregating unit, and an aggregated information output unit that collectively outputs the M aggregated connection information items from the first to Mth connection information aggregating units. Detection circuit. 2. The m-th (1 ≦ m ≦ M) that activates the first to Mth connection information aggregating units and the aggregated information output unit to obtain the aggregated connection information and output the aggregated connection information indicating that there is a connection. A) activates the m-th connection information output unit connected to the m-th group of terminals to which the connection information aggregating unit is connected, and outputs a connection information of all the terminals included in the m-th group. The connection information detection circuit according to claim 1, further comprising: 3. A connection information detecting method for detecting presence / absence of connection between terminals of a device to be detected having a plurality of terminals,
The plurality of terminals are divided into first to M-th groups, and it is determined whether or not connection information indicating that connection is present is included in each group. A connection information detecting method, wherein connection information of all terminals included in the group is output only to the group.