JPH04341029A - Data transfer device - Google Patents

Abstract

PURPOSE:To establish the synchronization and to simplify the transfer means without need of an additional data such as a preamble and a delimiter. CONSTITUTION:The transfer device is provided with a transmission section 30 having an adding means 31 adding sets of control information 1a, 2a, na, 6a representing the validity of data 1,2,n,6 to be transferred and a transmission means 32 sending the resulting data to a communication line 21, and with a reception section 40 having a validity discrimination means 41 taking synchronization with the control information 1a, 2a, na, 6a of the received data and discriminating the validity of the data. Through the constitution above, the synchronization is taken and the transfer means is simplified without need of additional data.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transfer device.

0002

[Prior Art] FIG. 4 is a diagram showing a data structure in a conventional synchronous transfer method. In the figure, 1 is data 1, n
is data n, 3 is preamble, 4 is start delimiter, 5
is the end delimiter, and 6 is the CRC data. FIG. 5 is a flowchart showing a procedure in a conventional synchronous transfer method. In the figure, 7 is a preamble judgment step, 8 is a start delimiter judgment step, 9 is an end delimiter judgment step, and 10 is a data transfer step.

Next, the operation will be explained. In order to transfer n bytes of data 1 to data n, data having the structure shown in FIG. 5 is sent from the transmitting side to the receiving side. Here, in order to establish synchronization between the transmitting side and the receiving side, the transmitting side sends a preamble 3 followed by a start delimiter 4 and an end delimiter 5, and the data is transferred in the data structure shown in FIG. The receiving side determines the preamble 3 from among the received data in a preamble determination step 7. After receiving the preamble 3, the start delimiter is determined in a start delimiter determining step 8, and when the start delimiter 4 is received, it is determined that synchronization has been established. On the receiving side, data received from the time when synchronization is determined to when the end delimiter 5 is determined in the end delimiter determining step 9 from among the received data is regarded as valid data. Valid data consists of n-byte data and CRC data 6, and the n-byte data is checked using CRC data 6.

0004

[Problems to be Solved by the Invention] (1) Since the conventional synchronous transfer method is performed using the steps described above, in order to establish synchronization between the sending side and the receiving side when performing data transfer, A preamble, a start delimiter, and an end delimiter must be added, and there is a problem in that efficiency is poor when the amount of data to be transferred is small. (2) Furthermore, in order to extract valid data from the data having the structure shown in FIG. 5, it is necessary to distinguish the preamble, start delimiter, and end delimiter from valid data, which makes the procedure and circuit complicated. was there. (3) Also, since the preamble, start delimiter, and end delimiter are used to establish synchronization between the sending side and the receiving side, valid data must be continuous.
There was a problem in that all the data to be transferred had to be prepared before the transfer started.

[0005] This invention was made to solve the above-mentioned problems, and it uses data that does not require additional data such as a preamble, start delimiter, and end delimiter, and that facilitates synchronization establishment and transfer procedures. The purpose is to obtain a transfer device.

[0006]

[Means for Solving the Problems] A data transfer device according to the present invention provides a control bit in addition to the data bits to be transferred, and performs transfer in units of the data bits and control bits. The control bit is used to control data transfer, and the device has at least one of the following transmitter and receiver. (a) a transmitter having the following elements; (a1) an addition means for adding at least validity information indicating the validity of the data to the data to be transferred as control information; (a2) control information is added by the addition means; (b) A receiving unit having the following elements; (b1) Validity information of the data transmitted by the transmitting unit synchronizes the reception and checks the received data. Effectiveness judgment means to judge effectiveness.

[0007]

[Operation] The control bit (validity information in the control information) in this invention establishes synchronization between the sending side and the receiving side, and indicates whether the bits of data transferred at the same time are valid or invalid. It works as shown.

[0008]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a data transfer device according to the present invention, in which 20 is a data transfer device, 21 is a communication line for data transfer, 30 is a transmitter, 31 is an addition means for adding control information to data, and 32 is a control a transmitting means for transmitting data with added information to the communication line 21; 40 is a receiving unit; 4;
Reference numeral 1 indicates validity determining means for synchronizing received data using control information and determining the validity of the received data; 42 indicates type determining means for determining the type of received data from control information; 4
3 is a processing means for transferring and checking data, 60 is sending data, 70 is receiving data, 70 is a processing means, 1a
, 2a, na, and 6a are control information, and 1, 2, n, and 6 are data 1 containing control information 1a, 2a, na, and 6a, respectively.
, data 2, data n, and CRC data.

FIG. 2 is a diagram showing the data structure of the data transfer device according to the present invention, where 1 is data 1, n is data n, 13 is a data bit, and 14 is a control bit A (
(an example of validity information), 15 is control bit B (an example of type information), and 1a is control information of data 1.

FIG. 3 is a flowchart showing the transfer procedure according to the present invention, in which 16 is a step of determining the validity of control bit A, 17 is a step of determining the type of control bit B, 18 is a data transfer step, and 19 is a CRC check. It is a process.

Next, the operation will be explained. In order to transfer n units of data 1 to data n, data 60 having the structure shown in FIG.
will be sent. Here, control bit A has the following meaning. Control bit A=1 Valid control bit A=0 Invalid Control bit B has the following meaning. Control bit B=1 CRC data control bit B=0 Normal transfer data

When normal transfer data is generated, the adding means 31 generates control information with control bit A=1 and control bit B=0 and adds it to the data. Furthermore, when normal data is not generated, control information with control bit A=0 (the value of control bit B in this case may be arbitrary) is generated and added to the dummy data. When transferring CRC data, control information with control bit A=1 and control bit B=1 is generated and added to the CRC data. Transmission means 3
2 sends various data with control information created by the adding means 31 to the communication line 21 with the control bit A at the beginning.

The receiving unit 40 synchronizes with the control bit A at the head of each data 1, 2, n, and 6 of the received data 70 transferred. The control bit A=1 is information indicating the validity of data, and at the same time has a meaning as a synchronization signal. When control bit A=1, the first signal is turned ON, and upon input of this ON signal, the receiving section 40 detects reception of data and synchronizes with subsequent signals. In addition, the receiving section 40
The control bit A of the received data 70 is determined in a control bit A validity determining step 16, and if it is "1", it is determined that the data bit 13 is valid.

When the data bit 13 is valid, the receiving side determines the control bit B of the received data in a control bit B type determination step 17. Control bit B is “0”
In this case, the data bit 13 is transferred in the data transfer step 18, and if the control bit B is "0", the received CRC data is used in the CRC check step 19 to check the data bits that have already been transferred. I do.

Example 2. Note that in the above embodiment, two bits are added as control bits separately from the data bits, but even if one bit is added as validity information, synchronization between the transmitting side and the receiving side is established, and the data bits are valid. The same effect can be achieved in that it indicates whether it is valid or invalid. In addition, in the above embodiment, 2 bits are used as control bits (control information).
Although the bits are added separately from the data bits, the same effect can be achieved even if three or more bits are added.

As described above, in this embodiment, control bits are provided in addition to data bits, and transfer is performed in units of the data bits and control bits.
A data transfer device that controls data transfer using control bits is characterized in that it does not require additional information such as a preamble, start delimiter, and end delimiter for extracting valid data. explained. Furthermore, a data transfer device has been described which is characterized in that even if transfer units including valid data bits are not consecutive and invalid data bits are mixed, the receiving side can extract only valid data bit strings.

[0017]

[Effects of the Invention] As described above, according to the present invention, control information is provided in addition to the data to be transferred, and transfer is performed in units of data and control information, so that the sending side and the receiving side are synchronized. This has the effect that it can be obtained in one transfer unit. In addition, since the sending and receiving sides can be synchronized in one transfer unit, the transfer can be performed correctly even if the transfer units containing valid data bits are not consecutive and the transfer units containing invalid data bits are mixed. effective.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a data transfer device according to an embodiment of the present invention.

FIG. 2 is a data structure diagram of a data transfer device according to an embodiment of the present invention.

FIG. 3 is a flowchart showing the transfer procedure of the receiving section of the present invention.

FIG. 4 is a data structure diagram of a conventional data transfer device.

FIG. 5 is a flowchart showing a conventional transfer procedure on the receiving side.

[Explanation of symbols]

1 Data 1 2 Data 2 n Data n 6 CRC data 1a, 2a, na, 6a Control information 14 Control bit A (an example of validity information) 15 Control bit B (an example of type information) 20 Data transfer device 21 Communication line 30 Transmitting unit 31 Adding unit 32 Transmitting unit 40 Receiving unit 41 Validity determining unit 42 Type determining unit 43 Processing unit 60 Transmitted data 70 Received data

Claims (1)

[Claims] Claim 1: A data transfer device having at least one of the following elements (a) and (b): (a) a transmitter having the following elements; an addition means for adding validity information indicating validity as control information; (a2) a transmission means for transmitting data to which control information has been added by the addition means as a unit of transfer; (b) a reception unit having the following elements; ) Validity determining means for synchronizing reception and determining the validity of the received data based on the validity information of the data transmitted by the transmitter.