JPS6360646A - Data link multiplexer - Google Patents

Abstract

PURPOSE:To attain multiplexed data transmission by changing kinds of flags representing sections of a data depending on each transmission control procedure. CONSTITUTION:In inputting a data to be sent to a procedure control circuit 1 from a host device, a request signal of data transmission is sent to a flag addition circuit 4. In inputting a sent data to a procedure control circuit 2, a request signal of data transmission is sent to the flag addition circuit 4. The flag addition circuit 4 sends a selection signal to a transmission data selector 8 in response to each request signal and at the same time sends a command signal of flag addition in response to the procedure control circuit 1 or 2 selecting the sent data to a transmission shift register 6. Thus, the register 6 adds the commanded start flag and end flag to the transmission data and sends the result to the line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data link multiplexing device that multiplexes data transmission in data communications using data links.

[Prior Art] Conventionally, when data with different constants such as retransmission timer value and number of retransmissions are transmitted over a single line using the same transmission control procedure, or when the same data is transmitted between different types When transmitting data over a single line using a control procedure, it was necessary to divide the line into channels by means of time division multiplexing or frequency division multiplexing.

[Problems to be solved] The above-mentioned channel division configuration requires means for time division multiplexing and frequency multiplexing, resulting in a multiplexing device with a complicated configuration. Since the frequency of use varies depending on the
Even if there is a channel with a lot of free time, that channel cannot be used in combination with other channels, and therefore data transmission cannot be performed efficiently.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a data link multiplexing device that has a simple configuration and can efficiently multiplex and transmit data. .

[Means for Solving Problems] In order to solve the above-mentioned problems, the present invention provides a plurality of procedure control circuits for processing transmission control procedures of data to be sent and received with a host device, and a start flag for each of these procedure control circuits. ,
A flag adding means that selects the type of end flag, adds the flag to data from the corresponding procedure control circuit, and sends the data to the line; and a start flag for the data received from the line.

The present invention is configured to include flag determining means for determining the type of end flag and selecting one of the procedure control circuits to process the data.

"Embodiment" Hereinafter, an embodiment of a data link multiplexing device according to the present invention will be described with reference to the drawings.

In the drawing, the procedure control circuit 1.2 is a flag determination circuit that issues a data transmission request signal when transmitting and receiving data to and from a host device (not shown), and also performs data procedure processing to exchange data. 3 determines the type of flag (start or end) of data received from the line (receiving shift register 5), and controls one of the procedure control circuits (1 or 2) to process the data based on this flag. select. The flag adding circuit 4 adds a flag (
start or end).

The reception shift register 5 selects data and a flag (start or end) in the data received from the line, and supplies the flag to the flag determination circuit 3. The transmission shift register 6 transfers the flag (start or end) instructed by the flag adding circuit 4 to the data (via the transmission data selector 8) from the procedure control circuit (l or 2) which holds it internally. ). The reception data selector 7 instructs the selection of procedural processing on the data from the reception shift register 5 based on the judgment of the flag judgment circuit 3, that is, sends it to the procedure control circuit (l or 2). Based on the selection instruction signal of the addition circuit 4, data from the procedure control circuit (1 or 2) is sent to the transmission register 6 for flagging.

Next, the operation of this embodiment configured as described above will be explained.

First, data transmission will be explained.

When data to be transmitted is input to the procedure control circuit 1 from a higher-level device (not shown), the procedure control circuit 1 sends a data transmission request signal to the flag adding circuit 4, or the higher-level device (not shown) sends a data transmission request signal to the procedure control circuit 1. When transmission data is input to the , the procedure control circuit 2 sends a data transmission request signal to the flag addition circuit 4, and the flag addition circuit 4 sends a data transmission request signal to the transmission data selector 8 in response to each data transmission request signal. A selection signal is sent, whereby the transmission register 6 selects the transmission data to be sent to the transmission data selector 8. At the same time, the flag addition circuit 4 selects the transmission data according to the procedure control circuit (1 or 2) that selected the transmission data. An instruction signal for adding the flag is sent to the transmission shift register 6. As a result, the transmission shift register 6 adds the instructed start flag and end flag to the transmission data, and sends the data to a line (not shown).

Next, data reception will be explained.

When received data is input to the reception shift register 5 through a line (not shown), the reception shift register 5 sends the type of start flag to the flag determination circuit 3. As a result, the flag determination circuit 3 determines which procedure control circuit (l or 2) the received data should be sent to depending on the type of flag,
Process as follows.

That is, in the case of received data sent to the procedure control circuit 1,
A selection signal is sent to the reception data selector 7, and a reception data arrival signal is sent to the procedure control circuit 1. Then, the procedure control circuit 1 performs procedure processing on the data sent from the received data selector 7, and sends the received data to a host device (not shown).

On the other hand, in the case of received data to be sent to the 1-procedure control circuit 2, the flag determination circuit 3 sends a received data arrival signal to the received data selector 7. Then, the 1-procedure control circuit 2 performs procedural processing on the data sent from the received data selector 7, and sends the received data to a higher-level device (not shown).

As described above, according to this embodiment, data transmission can be performed using different transmission control procedures on the same line by changing the flag for each piece of data that undergoes different procedure processing. This is different from the conventional channel division method, which has good data transmission efficiency and is realized with a simple configuration.

[Effects of the Invention] As explained above, in the data link multiplexing device of the present invention, by changing the type of flag indicating data delimitation for each transmission control procedure, data using different transmission control procedures can be processed on the same line. Transmission can be easily multiplexed. Therefore, there is an effect that multiplexed data transmission can be efficiently performed using a device with a simple configuration.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of a data link multiplexing device according to the present invention. 1, 2 procedure control circuit 3: Flag judgment circuit 4: Flag addition circuit 5: Reception shift register 6: Transmission shift register 7: Reception data selector 8: Transmission data selector

Claims (1)

[Claims] A plurality of procedure control circuits that process transmission control procedures for sending and receiving data between the host device and the type of start flag and end flag are selected for each of these procedure control circuits, and the flags are sent from the corresponding procedure control circuit. flag adding means for adding the data to the data and sending the data to the line; and determining the types of the start flag and end flag of the data received from the line;
A data link multiplexing device comprising flag determining means for selecting one of the procedure control circuits to process the data.