JPS62234437A - Data communication synchronizing device - Google Patents

Abstract

PURPOSE:To reduce the scale of a data accumulator and also to shorten the delay time of data communication by using the data block start information, the data block end information and the data output timing information to control the data accumulator. CONSTITUTION:A data output timing generator 5 informs the data output timing information to a data accumulator 1 based on the known finite data block length as well as the synchronous differential information received from a synchronous information differential detector 4. In other words, the generator 5 informs the data output timing information to the accumulator 1 immediately after receiving the data block start information from a data block start detector 2 if the data communication speed of an S2 synchronizing system is slower than that of an S1 synchronizing system. Then the initialization is performed based on the data block end information issued from a data block end detector 3 so as to produce the next data output timing information. The accumulator 1 starts output of the stored input data by means of the S2 synchronizing information at and after a time point when the data output timing information is received from the generator 5.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a data communication system in which the data communication speeds between communication devices are not synchronized, in which each communication device communicates with the opposing communication device at its own data communication speed. The present invention relates to a data communication synchronization device that enables data communication with.

[Conventional technology]

A data communication system is established by synchronizing communication devices to perform data communication, and synchronizing the synchronization systems of the slave communication devices with the synchronization system of the main communication device. A conceptual diagram of this synchronization system is shown in FIG. The main communication device 6 is data and synchronization 114? The information is sent to the slave communication device 7, and the slave communication device adjusts its synchronization system based on the sent synchronization information.

[Problem that the invention seeks to solve]

There is no problem as long as the data communication system is single and a master-slave relationship is established between communication devices regarding synchronization as described above.
As data communication systems become more complex, cases arise where this master-slave relationship is not established.

For example, one communication device operates in a synchronous system called Sl,
A situation can be considered in which the other communication device must operate in a synchronous system called S2.

In such a case, in the conventional technology, for example, as shown in FIG.
A synchronous buffer device 10 is provided between a communication device 8 that operates in a synchronous system called Sl and a communication device 9 that operates in a synchronous system called 82.
It is known that a data communication system can be constructed by installing a communication device to apparently establish synchronization between communication devices.

This synchronization buffer device receives Sl synchronization information and 82 synchronization information from the communication devices 8 and 9, first receives data from the communication device 8 using the synchronization system 81, and stores the data. The data is transferred to the communication device 2 using the synchronization system. This makes it possible to apparently establish synchronization between communication devices and to construct a data communication system.

However, this synchronous buffer device has the disadvantage that the scale of the circuit for storing data becomes large, and that data communication delay time increases because data is transferred using the next synchronous system after data storage is completed. be.

In view of the above-mentioned conventional circumstances, an object of the present invention is to provide a data communication synchronization device that operates data communication between communication devices having independent synchronization systems as if apparent master synchronization had been established with a minimum delay time. Our goal is to provide the following.

[Means for solving problems]

The present invention provides a data communication synchronization device that is inserted between two communication devices with different synchronization systems to establish apparent synchronization of these communication devices. a data block start detector that detects the start of the data block and generates data block start information; a data block end detector that detects the end of the data block and generates the data block end information; and synchronization information from the two communication devices. a synchronous information difference detector that detects a synchronous difference and generates synchronous difference information; and a synchronous information difference detector that detects a synchronous difference and generates synchronous difference information; and generates data output timing information that determines the output timing of data accumulated in the data accumulator based on the synchronous difference information and data block length. a data output timing generator, the data block start information;
The present invention is characterized in that data communication between the two communication devices is synchronized by controlling the data storage device using the data block end information and the data output timing information.

Note that data sent and received in a data communication system is always communicated in units of blocks constructed of one finite piece of information, so it is possible to confirm the start and end points of this data block.

〔Example〕

Next, an embodiment of the present invention will be described in detail with reference to FIG.

In FIG. 1, 1 is a data accumulator, 2 is a data block start detector, 3 is a data block end detector, 4 is a synchronization information difference detector, and 5 is a data output timing generator.

The data communication synchronization device according to this embodiment is used by being installed between communication devices in the same way as the conventional synchronization device shown in FIG.

The input data from the communication equipment of the synchronous system Sl and the synchronization information of the Sl are respectively stored in the data storage device 1. It is input to a data block start detector 2 and a data block end detector 3.

The 81 synchronization information is further input to the synchronization information difference detector 4.

In addition, the 32 synchronization information from the communication device of the synchronization system S2 is as follows.
Each is input to a data accumulator 1 and a synchronization information difference detector 4.

The data block start detector 2 monitors the input data using the Sl synchronization information, and notifies the data accumulator 1 and the data output timing generator 5 of the data block start information when detecting the start of a data block.

The data accumulator 1 starts accumulating input data using the 81 synchronization information from the time it receives notification of the data block start information from the data block start detector 2.

The data block end detector 3 similarly monitors input data using the 81 synchronization information, and notifies the data accumulator 1 and the data output timing generator 5 of data block end information when detecting the end of the data block.

The data storage device 1 ends the data storage operation when it receives the data block end information from the data block end detector 3.

The synchronization information difference detector 4 detects 8 from the synchronization information of SL and S2.
The synchronization difference of S2 based on the synchronization of S1 is detected, and the data output timing generator 5 is notified of this synchronization difference information.

The data output timing generator 5 notifies the data storage 231 of data output timing information based on the synchronization difference information from the synchronization information difference detector 4 and the known finite data block length.

That is, if the data communication speed of the 82 synchronous system is slower than that of the 81 synchronous system, the data output timing generator 5 immediately transmits the data output timing information after receiving the data block start information from the data block start detector 2. The data storage unit 1 is notified and initialized so that the next data output timing information can be generated upon notification of the data block end information from the data block end detector 3.

From the time when the data accumulator l receives the notification of data output timing information from the data output timing generator 5,
Start outputting the accumulated input data using the synchronization information of S2.

If the data communication speed of the 82 synchronous system is slower than that of the 81 synchronous system, 1. If the data output timing generator 5 generates data output timing information immediately after receiving notification of data block start information, it will overspeed and will not work correctly. Since no data transfer takes place, a finite known data block length and St.

The data output timing time is calculated based on the synchronization difference information of S2, and the data output timing information is notified to the data ff1ffl unit 1 at a timing delayed by this time.

From the time when the data accumulator 1 receives notification of data output timing information from the data output timing generator 5,
82 synchronization information to start outputting the accumulated input data. Further, the data accumulation operation ends at the time when the data block end information is notified from the data block end detector 3. Correspondingly, the data output operation is stopped when all accumulated input data has been sent out.

By performing the above operations, data communication from the 81 synchronous communication device to the 82 synchronous communication device becomes possible.

〔Effect of the invention〕

As described above, a data communication system can be constructed by inserting the data communication synchronization device according to the present invention between communication devices of different synchronization systems. Furthermore, since data is transferred while data is being accumulated, the scale of the data accumulator can be reduced compared to conventional synchronous buffer devices, and data communication delay time can also be reduced.

[Brief explanation of drawings]

Fig. 1 is a diagram showing a configuration example of a data communication synchronization device according to the present invention, Fig. 2 is a conceptual diagram of a synchronization system in a data communication system, and Fig. 3 is a diagram for performing data communication between communication devices with different synchronization systems. FIG. 3 is a diagram illustrating an example of a case where a synchronous buffer device is used. ■・・・Data accumulator

Claims (1)

[Claims] (1) In a data communication synchronization device that is inserted between two communication devices with different synchronization systems to establish apparent synchronization of these communication devices, there is a data accumulator that accumulates the data to be transferred and a data block start. a data block start detector that detects the end of the data block and generates data block start information; a data block end detector that detects the end of the data block and generates data block end information; and synchronization information from the two communication devices. a synchronous information difference detector that detects a synchronous difference and generates synchronous difference information; and a synchronous information difference detector that generates data output timing information that determines the output timing of data stored in the data accumulator based on the synchronous difference information and data block length. a data output timing generator, the data block start information;
A data communication synchronization device characterized in that data communication between the two communication devices is synchronized by controlling the data storage device using the data block end information and the data output timing information.