KR100227335B1 - Data transfer method between multiple systems - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to data transfer between multiple systems, and more particularly, to a data transfer method between multiple systems for transferring data at high speed when transmitting and receiving data through parallel common buses between multiple stations.

In the conventional data transfer apparatus, each substation 10a When data is exchanged between 10n), data is recorded and transmitted in the transmission data area of the common memory provided therein, and data is received by reading the data in the reception data area of the common memory so that data is transmitted. There is a problem that is degraded and can not transfer data at high speed to reduce the system performance.

The present invention improves system performance since data is transmitted at high speed when data is transmitted and received through a parallel common bus between a plurality of stations.

Description

How to Transfer Data Between Multiple Systems

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to data transfer between multiple systems, and more particularly, to a data transfer method between multiple systems for transferring data at high speed when transmitting and receiving data through parallel common buses between multiple stations.

In general, in an exchange system composed of a plurality of unit systems, each unit system performs a unique operation while exchanging data through a common parallel bus.

Conventionally, when data is transmitted and received through a common parallel bus between a plurality of systems, data is transmitted to a device as shown in FIG. That is, the plurality of substations 10a in FIG. When data is transmitted and received between 10n), data is transmitted and received via the main station 20. The main station 20 is provided with a microprocessor (not shown) for transferring data. Station (10a) A parallel address line AL2 and a parallel data line DL2 are connected between 10n and the main station 20 to exchange data with the parallel address line AL2 and the parallel data line DL2. On the other hand, each substation 10a 10n) includes a microprocessor 11 and a common memory 12, and the microprocessor 11 and the common memory 12 are interconnected through a parallel address line AL1 and a parallel data line DL1. As shown, the microprocessor 11 transmits and receives data through the common memory 12.

Referring to the operation of the conventional data transfer device in more detail as follows. For example, when the substation 10a transmits data to the substation 10c, first, the data to be transmitted by the microprocessor 11 of the substation 10a is transferred to the transmission data area of the common memory 12. When recorded, the main station 20 addresses the transmission data area of the common memory 12 included in the substation 10a through the parallel address line AL2 and reads the data through the parallel data line DL2. . Thereafter, the main station 20 addresses the common memory of the substation 10c via the parallel address line AL2 and simultaneously outputs the data through the parallel data line DL2 to store the data in the reception data area of the corresponding common memory. When the data is recorded, the microprocessor of the substation 10c reads the data recorded in the reception data area of the corresponding common memory.

In the conventional data transfer apparatus as described above, each substation 10a When data is exchanged between 10n), data is recorded and transmitted in the transmission data area of the common memory provided therein, and data is received by reading the data in the reception data area of the common memory so that data is transmitted. There is a problem that is degraded and can not transfer data at high speed to reduce the system performance.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and when data is transmitted and received through a parallel common bus between a plurality of stations, data between a plurality of systems to improve system performance by transferring the data at a high speed. The purpose is to provide a delivery method.

In order to achieve the above object, a feature of the present invention is a data transfer method between multiple systems for transferring data transmitted and received between a plurality of substations by a main station, wherein a search unit provided in the main station includes a first substation. Outputting a search address strobe signal to the first substation while simultaneously outputting a search address corresponding to the first substation; A second step of, when the first sub-station receives its search address from the search unit, checks whether there is data to be transmitted, and outputs a data transmission request signal to the search unit if there is data to be transmitted; A third step of, when the search unit receives a data transmission request signal from the first sub station, outputting a transmission request signal to a transmission unit provided in the main station; A fourth step of the transmission unit receiving a transfer request signal from the search unit and outputting a response signal indicating that data transfer is possible to the search unit; A fifth step of, when the search unit receives the response signal from the transfer unit, outputting a search address output to the first sub-station side to the transfer unit side; The transfer unit stores the search address applied from the search unit as a source address, outputs the source address to the first substation side, and simultaneously outputs a source address strobe signal and a read control signal to the first substation side. Outputs and reads data from the first substation, outputs the destination address contained in the head portion of the data to the second substation side along with the destination address strobe signal, and simultaneously writes a control signal to the second substation side. A sixth step of outputting and transmitting data to the second sub-station side; When the second sub-station receives a destination address and a destination address strobe signal from the transfer unit, if the corresponding destination address is the same as the address given to the second sub station, the data is transmitted from the transfer unit and a recording control signal from the transfer unit. In accordance with the seventh process of receiving.

According to the present invention, when transmitting and receiving data through a parallel common bus between a plurality of stations to transfer the data at a high speed to improve the system performance.

1 is a block diagram showing a data transfer device between a number of conventional systems.

2 is a block diagram illustrating an apparatus for transferring data between multiple systems in accordance with the present invention.

3 illustrates data transfer between substations.

4 is a flowchart illustrating a data transfer process between substations.

* Explanation of symbols for main parts of the drawings

SS1 SSn: Substation MS: Main Station

30: search unit 40: delivery unit

A data transfer device between multiple systems according to the present invention has a plurality of substations SS1 as shown in FIG. SSn) and main station (MS), each substation (SS1) SSn is configured by connecting to main station MS through a common parallel bus including parallel address line AL3, parallel control line CL and parallel data line DL3. On the other hand, the main station (MS) is provided with a search unit 30 and the transfer unit 40, the search unit 30 is each substation (SS1) Searching for the data transfer request generated from SSn, the transfer section 40, if the occurrence of the data transfer request is detected by the search section 30, the corresponding substation (SS1) It transmits data transmitted and received between SSn).

That is, the search unit 30 stores each sub station SS1. SSn) outputs search address and search address strobe signal to the substation (SS1). When the data transmission request signal is applied from SSn), the transmission request signal is output to the transmission unit 40, and when the response signal from the transmission unit 40 is received, the corresponding search address is output to the transmission unit 40 side. do. In addition, when the transfer request signal is applied from the search unit 30, the transfer unit 40 outputs a response signal indicating that data transfer is possible to the search unit 30 to output a search address applied from the search unit 30. Substation that stored the source address and requested data transmission of the source address (SS1) The substation (SS1) which outputs to the SSn side and requests data transmission of the source address strobe signal and the read control signal. Output to SSn) and the corresponding substation (SS1) Read data from SSn), output the destination address on the head of the data together with the destination address strobe signal to the substation side of the transmission partner, and output the recording control signal to the substation side of the transmission partner. Is transmitted to the secondary station of the transmission counterpart.

On the other hand, the parallel control line CL is a substation SS1. The control signal is transmitted and received between SSn) and the main station MS. The search address strobe signal, the data transmission request signal, the source address strobe signal, the write control signal, the read control signal, and the destination address strobe signal are transmitted. The parallel address line AL3 is connected to the main station MS and the substation SS1. The address is input and output between the SSn), the search address, the source address and the destination address. The parallel data line DL3 is connected to the substation SS1. It transfers data input and output between SSn) and main station (MS).

In addition, when the substation transmits data to the other substation side, it transmits the data through the main station (MS). In the case of transmitting the data, the head station of the data carries the destination address, packet length information, and the transmission start bit. When transmitting to the (MS) side, the main station (MS) receives the data and transmits the destination address and the destination address strobe signal to the substation side, so that the substation of the corresponding destination address receives the data.

3 is a block diagram for better understanding of the configuration according to the present invention. For convenience of description, only the connection state between the main station MS and the substations SS1 and SS2 is shown. Referring to FIG. 3 and FIG. 4, the operation of the data transfer device of the present invention will be described below. For example, the operation of data transfer between the substation SS1 and the substation SS2 is described below.

First, the search unit 30 provided in the main station MS outputs the search address PA corresponding to the substation SS1 to the substation SS1, and simultaneously retrieves the search address strobe signal PAS. When outputting to the station SS1, the substation SS1 checks whether or not there is data to be transmitted as the search address PA granted to the station SS1 is authorized, and if there is data to be transmitted, the data transmission request signal TRQ. ) Is output to the search unit 30 side. At this time, when the search unit 30 receives the data transmission request signal TRQ from the sub-station SS1, the search unit 30 outputs the transfer request signal ENQ to the transfer unit 40, and the transfer unit 40 searches. In response to the transfer request signal ENQ from the unit 30, a response signal ACK for informing that data transfer is possible is output to the search unit 30. Accordingly, upon receiving the response signal ACK from the transfer unit 40, the search unit 30 outputs the search address PA, which has been output to the substation SS1, to the transfer unit 40. At this time, the transfer unit 40 stores the search address PA applied from the search unit 30 as a source address, and then outputs the corresponding source address SA to the substation SS1 and simultaneously source strobe. Outputs the signal SAS and the read control signal RD to the substation SS1, reads data from the substation SS1, and converts the destination address DA carried in the head portion of the data into a destination address strobe. A signal DAS is outputted to the substation SS2 of the transmission counterpart, and a write control signal WR is output to the substation SS2 of the transmission counterpart and data is output via the parallel data line DL3. Transmit to the substation (SS2) side of the transmission counterpart. When the destination address DA and the destination address strobe signal DAS are applied from the transfer unit 40, the sub station SS2 transmits the transfer unit 40 if the destination address DA is the same as the address assigned to the sub station SS2. Data is received from the transfer unit 40 according to the write control signal WR.

On the other hand, when the transmission unit 40 transmits data from the substation SS1 to the substation SS2 side, the transfer unit 40 responds based on the packet length information in the head portion of the data applied from the substation SS1. The data from the secondary station SS1 is read and transmitted to the secondary station SS2 by repeating the packet length. When the transfer end 40 reads data from the substation SS1 and transfers the data from the substation SS1 to the substation SS2, the data end bit at the end of the data read from the substation SS1 is read. The transfer of data to the secondary station SS2 ends.

That is, the present invention provides a plurality of substations SS1. In the case of transmitting and receiving data between SSn), since the main station (MS) directly transmits the data without passing through the common memory as in the prior art, it is possible to transfer the data at high speed, thereby improving the performance of the system.

As described above, the present invention improves system performance since data is transmitted at high speed when data is transmitted and received through a parallel common bus between a plurality of stations.

Claims (3)

In the data transfer method between a plurality of systems for transmitting and receiving data between a plurality of sub-stations by the main station, the search unit provided in the main station to the first sub-station side the search address corresponding to the first sub station A first step of outputting and outputting a search address strobe signal to the first sub-station side; A second step of, when the first sub-station receives its search address from the search unit, checks whether there is data to be transmitted, and outputs a data transmission request signal to the search unit if there is data to be transmitted; A third step of, when the search unit receives a data transmission request signal from the first sub station, outputting a transmission request signal to a transmission unit provided in the main station; A fourth step of the transmission unit receiving a transfer request signal from the search unit and outputting a response signal indicating that data transfer is possible to the search unit; A fifth step of, when the search unit receives the response signal from the transfer unit, outputting a search address output to the first sub-station side to the transfer unit side; The transfer unit stores the search address applied from the search unit as a source address, outputs the source address to the first substation side, and simultaneously outputs a source address strobe signal and a read control signal to the first substation side. Outputs and reads data from the first substation, outputs the destination address contained in the head portion of the data to the second substation side along with the destination address strobe signal, and simultaneously writes a control signal to the second substation side. A sixth step of outputting and transmitting data to the second sub-station side; When the second sub-station receives a destination address and a destination address strobe signal from the transfer unit, if the corresponding destination address is the same as the address given to the second sub station, the data is transmitted from the transfer unit and a recording control signal from the transfer unit. And a seventh process of receiving the data according to the method. The packet length information of claim 1, wherein when the transfer unit transmits data from the first sub-station to the second sub-station in the sixth step, the packet length information in the head portion of the data applied from the first sub-station. And transmitting data from the first substation to the second substation side by repeating the corresponding packet length based on the packet length. 2. The data of claim 1, wherein the transfer unit reads data from the first substation and transfers the data from the first substation to the second substation. Terminating the transfer of data to the second substation if an end bit is read.