JPS6142466B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an interactive communication system, and in particular, when performing data communication between a base unit communication control circuit and a slave unit communication control circuit, communication is performed while interacting with each other. Concerning interactive communication methods.

As a conventional data communication method, EIA-RS-232
-C or JIS-C-6361 was a data communication method. These conventional data communication systems are asynchronous or synchronous, and use specific lines or public lines having one to four signal lines to perform data communication in series.

However, with conventional communication methods, the data signal speed must be changed depending on conditions such as cable length, and the data signal speed is less than 20,000 bits/second, so the data transmission speed is slow and inefficient. It had the drawback of being bad. Furthermore, since conventional data communication systems perform data communication in series, they have the drawback of delay time due to signal lines and transmission distortion.

This invention was made in order to eliminate the drawbacks of the conventional communication method as described above, and it is an interactive communication method that allows data communication at high speed regardless of the length of the cable and does not cause transmission distortion. The purpose is to provide

To summarize the invention, at least a first data signal line and a second In this method, the devices are connected by a data signal line, and also connected by a first control signal line and a second control signal line, and communication is performed while interacting using these four types of signal lines.

Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention. In the configuration, a base communication control circuit 1 as an example of a first communication control device and a slave communication control circuit 2 as an example of a second communication control device are provided. A first data signal line 3, a second data signal line 4, a first control signal line 5, and a second control signal line 6 are connected between the base unit communication control circuit 1 and the slave unit communication control circuit 2. Connect with 4 types of signal wires.

The base unit communication control circuit 1 uses the first data signal line 3 as a data output signal line for sending transmission data, and uses the second data signal line 4 as a data input signal line for receiving received data. The first control signal line 5 is used as a control output signal line for sending control information, and the second control signal line 6 is used as a control input signal line for receiving control information.
Use. On the other hand, the handset communication control circuit 2 uses the first data signal line 3 as a data input signal line for receiving received data, and uses the second data signal line 4 as an output signal line for sending transmission data. The first control signal line 5 is used as a control input signal line for receiving control information, and the second control signal line 6 is used as a control output signal line for sending control information. The communication control circuits 1 and 2 simultaneously transmit and receive data using these data signal lines and control signal lines.

Note that the illustration shows a case in which a pair of communication control circuits for a base unit and a slave unit are provided for simplicity of explanation.
Connect multiple communication control circuits to four types of signal lines,
Of any two communication control circuits for data communication, one may be used as a master device and the other one may be used as a slave device to perform communication control.

FIG. 2 is a flowchart showing the operation of the base unit communication control circuit. FIG. 3 is a flowchart showing the operation of the handset communication control circuit. FIG. 4 is a timing chart showing the operational relationship between the parent device and the slave device. In addition, in order to make it easier to understand the relationship between the flowchart in Figure 2 or 3 and the timing chart in Figure 4, the values corresponding to the numbers shown in a square on the right shoulder of each flow in Figure 2 or 3 are applicable. The timing points of the operating states are marked with the same numerical values enclosed in squares.

Next, the operation of this embodiment will be explained with reference to FIGS. 1 to 4. For example, the base unit communication control circuit 1 (hereinafter referred to as the base unit) and the slave unit communication control circuit 2
(hereinafter abbreviated as child device) assumes simultaneous mutual data communication.

Initially, both the parent unit and the slave unit are in standby mode. In this state, the base unit outputs logical information (for example, logic "0") indicating that data is not being transmitted to the control signal line 5. The handset outputs logical information (for example, logic "0") indicating that data can be received to the control signal line 6. The other signal lines may be in any state.

For data communication, the base unit outputs the data to be sent to the slave unit (in this example, it is 1 bit, but multiple bits of data may be used) to the data signal line 3, and the control signal line 5 is set to logic 1. Therefore, both the base unit and the slave unit enter a communication state.

As shown in FIGS. 2 and 4, the operation of the base unit in the communication state is as follows: First, data to be transmitted to the slave unit is transmitted to the data signal line 3.

Subsequently, the control signal line 5 is set to logic "1" as logical information indicating that data has been transmitted to the slave unit and that data from the slave unit can be received.

Next, the slave unit receives the contents of the control signal line 5 from the base unit, and the slave unit transmits the data signal line 4 to the base unit.
The control signal line 6 waits for the control signal line 6 to become logic "1" as logical information indicating that data has been transmitted using the .
(The time relationship in which the child unit outputs a logic ``1'' to the control signal line 6 in response to a logic ``1'' from the parent unit will be described later.)
) Next, when the control signal line 6 becomes logic "1", the control signal line 5 is changed to notify the slave unit that it has received that the control signal line 6 has become logic "1".
is set to logic "0".

Next, the handset waits for receiving the contents of the control signal line 5 and setting the control signal line 6 to logic "0". (At this time, the slave unit receives data on the data signal line 3 as will be described later).Next, a data read timing signal is generated in the control circuit of the base unit, and data on the data signal line 4 is received. (Here, we decided to receive the data at this stage, but it is also possible to receive the data at any stage, and in particular, it is best to receive the data immediately before the operation.) Next, it is determined whether the communication is finished. If it is finished, the communication is terminated and the communication returns to the standby state. If it is not finished, execute it repeatedly. Completion is determined by transmitting a predetermined amount of data, by receiving a predetermined code indicating termination from the slave unit, or by transmitting a specific code indicating termination to the slave unit.

When the handset is in the standby state, it always determines whether the truth value transmitted via the control signal line 5 is logic "1" or not, and when it receives logic "1", it enters the communication state.

As shown in FIG. 3, the slave device operates in the communication state by first waiting for the control signal line 5 to become logic "1".

Subsequently, when the control signal line 5 becomes logic "1", data to be transmitted to the base unit is transmitted to the data signal line 4.

Subsequently, the logic of the control signal line 6 is set to "1" as logical information indicating that the content of the control signal line 5 from the base unit has been received and that data has been transmitted to the base unit.

Next, the main device receives the contents of the control signal line 6 and waits for the control signal line 5 to be set to logic "0".

Subsequently, the control signal line 6 is set to logic "0" in order to notify the base unit that the control signal line 5 has received logic "0".

Subsequently, a data read timing signal is generated within the control circuit of the slave device, and the data on the data signal line 3 is received. (Here, we decided to receive the data at this stage, but it is also possible to receive the data at any stage, and it is best to receive the data immediately before the operation.) Next, it is determined whether the communication is finished. If it is finished, the communication is terminated and the communication returns to the standby state. If it is not finished, execute it repeatedly. The determination of termination is the same as that of the base unit.

As described above, if the predetermined data communication has not been completed, the base unit communication control circuit 1 and the slave unit communication control circuit 2 each return to the initial step.
By repeating the above operations, data is transmitted and received bit by bit.

In this way, in this embodiment, data is transmitted and received while mutually confirming the state of the control signals, so there is no delay time due to signal lines, and there is an advantage that it is not affected by transmission distortion. .
Further, since the data signal speed is inevitably determined by the performance of each communication control circuit and the length of the cable, there is no need to set it. In addition, in this example, 1
The state of the control signals is mutually confirmed bit by bit, and the speed at which 1 bit of data is transmitted can be extremely high compared to conventional methods. For example, 1 bit of data can be transmitted in 50 ns, so 20 Mbit/ It can be understood that data can be transmitted per second, making it approximately 100 times faster than conventional methods.

Note that in the above embodiment, the number of data output signal lines and data input signal lines is one when viewed from one communication control circuit, but these data output signal lines and data input signal lines can be made plural to form a bit. It can be used for parallel-byte-serial communication, bit-parallel-word-serial communication, etc. For example, if 8-bit data output signal lines and data input signal lines are connected, data communication can be performed at a speed of 20 Mbytes/sec.

As described above, according to the present invention, communication is performed between communication control devices using an interactive method, so that data transmission speed can be increased, transmission distortion can be eliminated, and highly reliable data communication can be achieved. Effects such as being able to perform

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a flowchart showing the operation of the base unit communication control circuit, FIG. 3 is a flowchart showing the operation of the slave unit communication control circuit, and FIG. 4 is a flowchart showing the operation of the slave unit communication control circuit. This is an operation timing chart. In the figure, 1 is a base device communication control circuit, 2 is a child device communication control circuit, 3 is a first data signal line, 4 is a second data signal line, 5 is a first control signal line, and 6 is a second data signal line. The control signal line is shown.

Claims (1)

[Scope of Claims] 1. At least a first communication control circuit and a second communication control circuit, wherein at least a first data signal line connects the first communication control circuit and the second communication control circuit. and second
are connected by a data signal line, a first control signal, and a second control signal line, and transmit data from each other or one of the first communication control circuit and the second communication control circuit to the other. At this time, the first communication control circuit
outputting data to the data signal line of the other communication control circuit and transmitting a first logic indicating that the data has been transmitted to the other communication control circuit via the first control signal line;
Thereafter, a second logic indicating that the first logic has been received from the other communication control circuit and that data has been transmitted from the other to the second data signal line is transmitted to the second logic.
When it is determined that the data from the other side has been transmitted via the second data signal line, it indicates that the data can be read. A logic that is an inversion of the first logic is transmitted to the other communication control circuit via the first control signal line, the other communication control circuit is brought into a state where data can be read, and then both control circuits are brought into a state where data can be read. After that, both control circuits read the data sent from the other communication control circuit into the control circuit, thereby allowing one communication control circuit to interact with the other communication control circuit. An interactive communication method for communicating.