JPH0654035A - Ic for communication control - Google Patents

Abstract

PURPOSE:To conduct a test of an IC by one kind of procedure independently of kinds of communication control ICs in the case of the test of a single IC. CONSTITUTION:An IC is a communication control IC1 connected between a terminal equipment and a line control IC, executing communication control according to a signal S1 representing attribute information given from the line control IC and a program stored in an internal memory and implementing a unit test and provided with a specific value storage section 4 storing in advance data representing the attribute information in response to the line control IC to be connected, a switch 13 through which a signal 2 representing the execution of usual control or the execution of the unit test is generated and a selection circuit 5 receiving the signal S1 representing the attribute information and data stored in the specific value storage section 4 and selecting and outputting the signal S1 representing the attribute information when the signal S2 represents the execution of usual control or the data stored in the specific value storage section when the signal S2 represents the execution of unit test.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication control IC, and more particularly to a communication control IC and a line control for a line control unit constituting a line processing system.
The present invention relates to a communication control IC when it is configured to operate with an IC.

[0002]

2. Description of the Related Art A line processing system for connecting a terminal device and a line network has a plurality of IC packages, each of which has a data link level control part and a physical level control part. It is generally composed of a package.

By the way, considering a certain terminal device, since the control at the data link level is fixed, a specific communication control IC may be prepared, but the control at the physical level is logical, electrical, or physical. The number of lines that can be connected differs depending on the different line types.

However, since the line control unit is combined with the communication control IC for the terminal device and one of the line control ICs, the line control IC is connected to itself during normal operation. It can operate normally by receiving its own attribute information from the line control IC and determining the type of line control IC. However, in the line interface, the communication control IC
When disconnecting from the line control IC and testing it by itself, the line control IC is not connected.
IC cannot receive attribute information.

[0005]

Therefore, the line control IC
When a function is added or a function is changed, the communication control IC is added by newly adding its own attribute information different from others.
Will determine the type of line control IC, but when a function is added or changed in the communication control IC in this way, the communication control IC is not connected to the line control IC. Cannot get its own attribute information. Therefore, when testing the communication control ICs individually in each line interface, prepare different test procedures for each of the various communication control ICs and store them in advance in the ROM etc. of each communication control IC. Need to be kept. Therefore, there is a problem in that the types of communication control ICs increase as the types of line control ICs increase.

The present invention has been made in view of such circumstances, and when a single test is performed, the communication control IC can be tested by one type of procedure regardless of the type of the communication control IC. The purpose is to provide IC.

[0007]

The block diagram of FIG. 1 shows the basic configuration of a communication control IC according to the present invention. In FIG. 1, reference numeral 1 indicates a communication control IC. The communication control IC 1 is usually connected between a line control IC (not shown) and a terminal device (not shown), and incorporates various circuits required for communication control. Is omitted.

Reference numeral 2 is an attribute information input section, which is shown in FIG.
A signal S1 indicating attribute information is normally input from a line control IC not shown in FIG. Reference number 3
Is a signal line to which a predetermined signal S2 is input when performing a unit test of the communication control IC 1, and is connected to a selection circuit 5 described later.

Reference numeral 4 is an eigenvalue storage section in which eigenvalues indicating the attribute information of the communication control IC 1 itself are stored in advance. The above-mentioned attribute information input unit 2 and eigenvalue storage unit 4
Are connected to the selection circuit 5, and the signal line 3 is also connected to the selection circuit 5. Then, the selection circuit 5 uses the signal line 3
Either the signal S1 input to the attribute information input unit 2 or the eigenvalue stored in the eigenvalue storage unit 4 is selectively output as the signal S3 in accordance with the signal S2 input via the.

[0010]

In the communication control IC of the present invention having such a principle configuration, it is shown that the signal S2 input through the signal line 3 is not in the unit test at the time of normal operation. The circuit 5 outputs the signal S1 input to the attribute information input section 2 as a signal S3. On the other hand, during the unit test,
Since the signal S2 input through the signal line 3 indicates that the unit test is being performed, the selection circuit 5 outputs the eigenvalue stored in the eigenvalue storage unit 4 as the signal S3.

Therefore, even when the number of communication control ICs 1 increases, the unique value storage section 4 of each communication control IC 1 is increased.
By changing the eigenvalues stored in advance in accordance with each type, various communication control ICs can be performed by simply inputting the signal S2 to the signal line 3 indicating that the unit test is in progress.
It becomes possible to perform the unit test of 1.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments thereof.

The block diagram of FIG. 2 shows the configuration of an embodiment of a communication control IC according to the present invention. In FIG. 2, reference numeral 1 indicates a communication control IC according to the present invention. The communication control IC 1 is usually connected between a line control IC (not shown) and a terminal device (not shown) and has various circuits necessary for communication control. Is omitted.

Reference numeral 2 is an attribute information input section, which is shown in FIG.
A signal S1 indicating attribute information is normally input from a line control IC not shown in FIG. The signal S1 indicating this attribute information has a plurality of bits, and the attribute information input section 2 is provided with an input buffer for signal lines corresponding to each bit.

Reference numeral 3 is a signal line for inputting a predetermined signal S2 to the selection circuit 5 which will be described later when a unit test of the communication control IC 1 is performed. This signal S2 is generated by the switch 13. That is, the switch 13 is normally connected to the power supply level and outputs "H" as the signal S2. However, when the communication control IC 1 is tested as a single unit, the switch 13 is switched so that "L" is output as the signal S2.

Reference numeral 4 is an eigenvalue storage section in which eigenvalues indicating the attribute information of the communication control IC 1 itself are stored in advance. The eigenvalue stored in the eigenvalue storage unit 4 is also the signal S1 input from the line control IC via the signal line 7.
It is a multiple bit of the same bit.

The above-mentioned attribute information input section 2 and eigenvalue storage section 4 are connected to the selection circuit 5, and the signal line 3 is also connected to the selection circuit 5. The selection circuit 5 is provided with a switching circuit 50 corresponding to the number of bits of the signal indicating the attribute information. In each switching circuit 50, each bit of the signal S1 given from the attribute information input section 2 is connected to one input terminal by the switch 13
The two-input AND gate 511 into which the signal S2 output from the input terminal is input to the other input terminal, and each bit of the eigenvalue stored in the eigenvalue storage unit 4 is output from the switch 13 to one input terminal. A two-input AND gate 512 in which the inverted signal of the signal S2 is input to the other input terminal,
It is composed of a two-input OR gate 513 to which the outputs of both AND gates 511 and 512 are input, and the output of this OR gate 513 is each bit of the signal S3.

Therefore, each switching circuit 50 of the selection circuit 5 is
When the signal S2 is "H", the output of the AND gate 511
Each bit of the signal S3 passes through the OR gate 513 as it is, and when the signal S2 is "L", the output of the AND gate 512 passes through the OR gate 513 as it is and is output as each bit of the signal S3. . In other words, if the signal S2 output from the switch 13 is "H", the selection circuit 5 selects the signal S1 indicating the attribute information input from the line control IC to the attribute information input unit 2 and outputs the signal. If the signal S2 output from the switch 13 is "L", the eigenvalue indicating the attribute information stored in the eigenvalue storage unit 4 is selected and output as the signal S3.

Reference numeral 8 is a microprocessor (hereinafter referred to as MPU) which controls the communication control IC 1. This MPU8 has data line 10, address line 11 and command line.
ROM 9 is connected via 12. The ROM 9 stores in advance a normal operation of the communication control IC 1, that is, a communication control program for executing communication control, a self-diagnosis program for a unit test, and the like.

The MPU 8 receives the signal S3 output from the selection circuit 5 through the signal line 6 and the reset signal RS.
T is input via the signal line 14, respectively.

The operation of the communication control IC of the present invention having such a configuration is as follows. When the power switch (not shown) is turned on and the power is turned on, or when the reset signal RST is given to the MPU8 via the signal line 14, the MPU8 is activated. At this time, switch 13 is "H"
If it is switched to the side and normal operation is set, the "H" signal S2 output from this switch 13 is MP.
Since it is given to U8, MPU8 reads the communication control program stored in ROM9 and starts normal control.

In this case, the output from the switch 13
The H "signal S2 is also given to each switching circuit 50 of the selection circuit 5. As a result, each switching circuit 50 of the selection circuit 5 directly outputs each bit of the signal S1 input from the attribute information input section 2 to the signal S3. To the MPU 8 via the signal line 6. Therefore, the MPU 8 can execute normal communication control according to this signal S3.

However, when the switch 13 is switched to the "L" side and execution of the unit test is set, the "L" signal S2 output from the switch 13 is given to the MPU8, so that the MPU8 Reads the self-diagnosis program from ROM9 and executes it.

In this case, the output from the switch 13
The L ″ signal S2 is also given to each switching circuit 50 of the selection circuit 5. As a result, each switching circuit 50 of the selection circuit 5 directly outputs each bit of the eigenvalue stored in the eigenvalue storage unit 4 as the signal S3. It is given to the MPU 8 via the line 6. Therefore, the MPU 8 can execute the self-diagnosis according to this signal S3.

[0025]

As described above in detail, according to the communication control ICs of the present invention, even if the types of communication control ICs increase, they are stored in advance in the respective communication control ICs. By changing a certain eigenvalue according to each type, it becomes possible to perform unit test of various communication control ICs only by giving a signal indicating that the unit test is in progress.

[Brief description of drawings]

FIG. 1 is a block diagram showing the basic configuration of a communication control IC of the present invention.

FIG. 2 is a block diagram showing a configuration of an embodiment of a communication control IC according to the present invention.

[Explanation of symbols]

 1 Communication control IC 4 Unique value storage 5 Selection circuit 13 Switch

Claims (1)

[Claims] 1. A communication control is performed according to a signal (S1) which is connected between a terminal device and a line control IC and which represents attribute information given from the line control IC and a program stored in advance in an internal memory. In addition, in the communication control IC (1) designed to perform the unit test, the eigenvalue storage unit (4) in which the data representing the attribute information corresponding to the connected line control IC is stored in advance, and the normal control A switch (13) for generating a signal (S2) indicating whether to execute or a unit test, a signal (S1) indicating the attribute information, and data stored in the eigenvalue storage unit (4). Is given, if the signal (S2) indicates to perform normal control, the signal representing the attribute information (S1), if it indicates to perform a unit test, the eigenvalue storage unit The data stored in (4) Communication control IC is characterized in that a selection circuit for selecting the output (5).