JPS6042969B2 - Memory management method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the control of memory devices used in electronic exchanges and the like, and particularly to a memory control method that requires modification of fixed data.

As a conventional memory management method, there is a well-known method for creating billing information in a telephone exchange network, for example, but these billings are performed by counting pulses with different times depending on the distance of the call, and the information used to create these pulses is The data is stored in the pulse generation circuit as fixed data.

For example, such a system has a configuration as shown in FIG. In FIG. 1, 1 is a fixed data memory, 2 is a calculation memory, 3 is a control section, 4 is a write circuit, P, ~Pn
indicates an output terminal. Note that each memory is divided into n pieces. The control unit 3 is connected to a circuit (not shown), for example 1.
It is activated every second and sequentially adds '1'' to the 1st to nth sets of the calculation memory 2, and whether the addition result of the corresponding j set matches the contents of the jth set of the fixed data memory 1. If they match, an output signal is given to the j-th terminal and the contents of the j-th set in the calculation memory 2 are set to ``0''. This output signal is controlled so that it continues for a certain period of time, and this method can be easily performed by using, for example, a monostable multi-half-lator circuit. In this way, by setting the n contents of the fixed data memory 1 to different values, n sets of pulses are created, and these pulse signals cause the charging frequency meter to walk. It's a pulse. In such a system, if it becomes necessary to change the fixed data due to rate revisions, etc., the pulse creation operation is stopped, the contents stored in the fixed memory are modified, and the pulse creation operation is restarted from the point at which the modification is completed. It's related. Such conventional fixed data changes have the disadvantage that billing stops even for a short period of time. An object of the present invention is to provide a memory management method that prevents billing from stopping even for a short period of time.

In order to achieve this objective, the present invention provides two sets of fixed data memories, and by transferring data between these memories, the fixed data is sequentially rewritten, and the memory contents are continuously updated when a data change request occurs. It is characterized by management.

In other words, there are two sets of memories that store the same fixed data, and when a request to change the fixed data occurs, one memory is blocked before the change time and the stored contents of that memory are changed, and after the change, unblocks the memory, blocks the other memory, and transfers the memory contents of the former to the latter;
After the transfer is completed, the latter blockage is released to ensure continuous and stable operation. Next, embodiments of the present invention will be described with reference to the drawings. 11 in Figure 2
, 12 is fixed data memory, 13 is calculation memory, 1
4 is a control unit, 15 is a memory read/write circuit, P1
-Pn indicate output terminals, respectively. Although the starting circuit of the control unit 14 is not shown, it is started at a cycle of, for example, one second. The control unit 14 has a fixed data memory 11 or 12.
n sets of output pulses are created using either one of the above and the calculation memory 13, and this creation method is the same as the conventional method. Note that fixed data memory 11 or 1
The control unit 14 determines which one of 2 is to be used. For example, if it is blocked, the unblocked one is used, and if both are not blocked, the memory 11 is used. Now, when it is necessary to modify (change) the fixed data, the modification is carried out via the read/write circuit 15 by operating a paper tape reader, electric key, etc. (not shown). That is, the read/write circuit 15 receives the usage status of the fixed data memory (for example, the memory 11 is being used) from the control unit 14, and when this circuit is activated, it blocks the fixed data memory 12 and the control unit 14 is prohibited from using the memory, and then the stored contents of the fixed data memory 12 are modified in accordance with input from the paper tape reader. For example, input data from a paper tape reader is (j),
(data J), (j+1), (data, +1),...
..., data D will be written in the jth set. When the input information from the paper tape reader disappears, the modification is complete. When the fixed data change time comes, the control unit 14 A switching instruction is input from a switching activation circuit (not shown) to reverse the blockage of the fixed data memory. That is, the blockage of the fixed data memory 12 is released and the fixed data memory 1 is blocked. Therefore, the control section 14 creates an output pulse using the newly modified fixed data.On the other hand, when the control section 14 changes the usage state of the fixed data memory, the read/write circuit 15 is activated.

At this time, the circuit 15 reads data from the first set of the fixed data memory 12, writes the read data to the first set of the fixed data memory 11, and sequentially performs the same process up to n sets. Data is transferred between fixed data memories to match the contents of both. When these transfers are completed, the reading/writing circuit 15 sends an instruction to release the blockage of the fixed data memory month 1 to the control unit 14, and the fixed data is returned to the state before modification. Kotoshi fixed data has been changed. By doing so, the operation of generating output pulses can be performed continuously and stably without stopping or interrupting. In addition, it is only necessary to modify data once using a paper tape reader, and since there are two sets of fixed data memories, it is not necessary to operate the paper tape reader twice for each fixed data memory. There is no need to repeat operations, and the operating procedure becomes simpler. As explained above, the present invention provides two sets of memories that store the same fixed data, and by providing a means for data transfer between these memories, one memory is blocked when the fixed data is changed. However, the contents of the memory are modified, and after the change, the memory is unblocked and the other memory is also blocked, the memory contents of the former are transferred to the latter, and after the transfer is completed, the latter is unblocked. With this configuration, billing pulse control and the like using fixed data can be executed continuously and stably without interruption.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional memory management system, and FIG. 2 is a block diagram of a memory management system according to the present invention. 11, 12... Fixed data memo 18 13...
Calculation memory, 14...control unit, 15...
...Read/write circuit, P1-Pn...Output terminal.

Claims (1)

[Claims] 1. Two sets of memories storing the same fixed data are connected by means of data transfer between these memories, and when a fixed data change request occurs, one of the fixed memories is blocked before the change time and the memory is The memory content of the memory is changed, and after the change, the memory is unblocked, the other fixed memory is blocked, the memory content of the former is transferred to the latter, and the latter is unblocked after the transfer is completed. memory management method.