JPH031697A - Memory management circuit for digital trunk - Google Patents

Abstract

PURPOSE:To control a digital trunk normally by providing a collation means and memory circuits in duplicate storing control information so as to detect an error of control information quickly even when a controller applies write to a storage device in error. CONSTITUTION:Control information corresponding to a trunk from a CPU 1 to a digital trunk 6 is received via an interface device 5 and stored in a 1st memory circuit 41 and a 2nd memory circuit 42 in a storage device 4. Then a processor 3 reads both the control information corresponding to the trunk 6 stored in the circuits 41, 42, compares them and sends a fault information to the CPU 1 via the device 5 in the case of noncoincidence. Thus the CPU 1 resends the control information to the trunk 6 to write normal data to the device 4 to detect an error of the control information even when the device is in write operation in error to attain the control of the trunk 6 normally.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a memory management circuit for a digital trunk in a digital trunk control device for a digital electronic exchange.

[Conventional technology]

Conventionally, the memory management circuit of this type of digital trunk stores only one set of control information received by the digital trunk control circuit from the central processing unit for switching control in a memory circuit provided in this control circuit, and stores the control information in the digital trunk. Reading the data necessary to control the trunk.

[Problem that the invention seeks to solve]

The conventional memory management circuit described above stores only one set of data to control the digital trunk, so if the stored data is destroyed, abnormal data is used to control the digital trunk, causing malfunction. There is a drawback.

[Means for solving problems]

The digital trunk memory management circuit of the present invention is a digital trunk control device that controls a plurality of digital trunks based on control information from a central processing unit of an exchange. The memory circuit is configured to include a duplicated memory circuit, and a checking means for periodically reading out the information stored in the duplicated memory circuit and checking whether the contents match.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, in which control information corresponding to a digital trunk 6 is transmitted from a central processing unit 1 of a digital electronic exchange to a central processing unit 1 in a digital trunk control circuit 2. A first memory circuit 41 and a second memory circuit 41 in the storage device 4 under the control of the processor 3 received via the interface device 5! The processor 3 connected to @42 is configured to perform control at a constant cycle corresponding to the trunk, and is configured to control the first memory circuit 41 and the second memory circuit 41.
The control information corresponding to the digital trunk 6 stored in the memory circuit 42 of the digital trunk 6 is read out and compared each time the control is performed, and if they are the same, it is determined that the data is normal, and the digital trunk 6 is controlled according to the control information. On the other hand,
If the result of this comparison is a mismatch, the processor 3 communicates with the central processing unit 1 via the interface device 5.
Send fault information to. When the central processing unit 1 recognizes the occurrence of a failure, it sends control information to the digital trunk 6 again and writes normal data to the storage device 4.
Even if the processor 3 mistakenly performs a write operation on the storage device 4, the error in control information can be quickly detected and the digital trunk 6 can be controlled normally.

In the embodiment shown in FIG. 1, the storage device 4 has two memory circuits, but the received control information is stored in one storage device at different addresses, one from address A and the other from address B. It is also possible to store and manage memory.

〔Effect of the invention〕

As explained above, in a digital trunk control device, the present invention stores control information corresponding to a digital trunk in a storage device in duplicate and compares the control information stored in the storage device at a constant cycle. This has the effect of preventing the digital trunk control device from erroneously controlling the digital trunk.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Central processing unit, 2... Digital trunk control device, 3... Processor, 4... Storage device, 5...
...Interface device, 6...Digital trunk, 41...First memory circuit, 42...Second memory circuit.

Claims (1)

[Claims] In a digital trunk control device that controls a plurality of digital trunks based on control information from a central processing unit of an exchange, a dual memory circuit that stores control information from the central processing unit, and a dual memory circuit that stores control information from the central processing unit. 1. A memory management circuit for a digital trunk, comprising checking means for periodically reading out information stored in the digital trunk to check whether the contents match.