JPH05241968A - Register device - Google Patents

Abstract

PURPOSE:To discriminate whether or not data written on a register is correct data and to find out the register in which malfunction occurs. CONSTITUTION:Input data and output data in the register 1 can be compared with each other by connecting a comparator 5 to the input signal line 3 and the output signal line 4 of the register 1. When the data is written on the register 1 by a write signal 2, the input data is compared with the output data by a comparison timing signal 6, and a result of equality/inequality is outputted as comparison result output 7 to discriminate the equality of the data written in the register 1. Thereby, it is possible to find out the register in which the malfunction occurs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a register device capable of determining whether or not data written in a register is correct.

[0002]

2. Description of the Related Art A conventional register device will be described below with reference to the drawings. FIG. 2 is a block diagram showing an n-bit register of a conventional register device. 1 is a register having a width of n bits. Reference numeral 2 is a write signal for writing data to the register 1. Reference numeral 3 is an input signal line to the register 1. Reference numeral 4 is an output signal line from the register 1.

The operation of the n-bit register of the conventional register device configured as described above will be described below.

As shown in FIG. 2, when the data of the input signal line 3 is fixed, the data is held in the register 1 by the write signal 2. The data held by the register 1 is output from the output signal line 4.

[0005]

However, in the above conventional register device, even if the register 1 malfunctions,
It was not possible to find it, and there was a problem in that the difference between the input data of the input signal line 3 and the output data of the output signal line 4 was difficult to occur, causing an abnormality in the entire system.

The present invention solves the above problems, and an object of the present invention is to provide a register device capable of determining whether or not the data written in the register 1 is correct.

[0007]

The present invention has the following constitution in order to solve the above problems. That is, it is characterized by including a register and a data comparison circuit for comparing the input data of the register and the output data of the register.

[0008]

According to the present invention, by comparing the input data and the output data of the register with the comparison circuit, it is possible to judge whether the data written in the register is correct or not, and find the register causing the malfunction. Is something that can be done.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a register device according to the present invention. In FIG. 1, 1 is a register. Reference numeral 2 is a write signal for writing data to the register 1. Reference numeral 3 is an input signal line for inputting data to the register 1. Reference numeral 4 is an output signal line for outputting the data from the register 1. Reference numeral 5 denotes a comparison circuit, one input terminal group is connected to the input signal line 3, and the other input terminal group is connected to the output signal line 4. Reference numeral 6 is a comparison timing signal that determines the timing of comparison in the comparison circuit 5. Reference numeral 7 is a comparison result output.

The operation of the register device configured as described above will be described below. The data input from the input signal line 3 is written in the register 1 by the write signal 2. The data held in the register 1 is output from the output signal line 4. At this time, the comparison circuit 5
Compares the input data of the input signal line 3 with the output data of the output signal line 4 at a timing determined by the comparison timing signal 6, and outputs the comparison result as a comparison result output 7.

As described above, according to the embodiment of the present invention, it is possible to judge whether the data written in the register 1 is correct by the comparison result output 7. It is also possible to find the register that caused the malfunction.

[0012]

As described above, according to the present invention, by providing the register with the comparison circuit for comparing the input / output data, it is possible to determine whether or not the data written in the register is correct, and further, the register in which the malfunction occurs It is possible to realize an excellent register device capable of discovering.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a register device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional register device.

[Explanation of symbols]

 1 register 2 write signal 3 input signal line 4 output signal line 5 comparison circuit 6 comparison timing signal 7 comparison result output

Claims (1)

[Claims] 1. A register device comprising: a register; and a data comparison circuit for comparing input data of the register and output data of the register.