JPS6352359A - High-speed serial communication method - Google Patents

Abstract

PURPOSE:To perform very high-speed communication with a very simple circuit constitution by equalizing the protocols of serial communication between a timer module and a system controller and that between the system controller and a controller and only switching gates to perform these serial communications in a same constitution. CONSTITUTION:Hardware protocols and software protocols of serial communication between a timer module 1 and a system controller 2 and that between the system controller 2 and a controller 3 are equalized. Thus, the timer module 1 directly returns data to the controller without passing the system controller 2 in response to the time relation command from the controller 3 to simplify the hardware, and further, it is unnecessary for the system controller 2 to preliminarily receive data from the timer module 1.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to a video tape recorder (hereinafter referred to as VTR).
This relates to a method of high-speed serial communication between an internal system controller (hereinafter referred to as a system controller) and a timer module.

BACKGROUND OF THE INVENTION In recent years, commercial VTRs have come to be controlled from the outside through serial communication, and have also come to have built-in timer modules such as time code readers and time code generators. Therefore, it is necessary to perform high-speed communication between the system controller and the timer module within the VTR.

An example of the conventional communication method between the above-mentioned system controller and timer module will be described below with reference to the drawings.

FIGS. 2 and 3 show a conventional communication method between a system controller and a timer module. In FIGS. 2 and 3, 1 is a timer module that performs time-related processing. 2 is a VTR system controller. 3 is external VTR
It is a controller for controlling. 4 is a dual-port RAM that can be accessed from both the timer module 1 and the system controller 2.

The operation of the conventional communication method between the system controller and the timer module configured as described above will be described below.

First, in the method shown in FIG. 2, time-related data obtained from the timer module 1 is written into the data port RAM 4. In accordance with a request from the controller 3, the system controller 2 receives and receives necessary data from the RAM 4 and sends it back to the controller 3.

However, in the method shown in FIG. 3, there is nothing between the timer module 1 and the system controller 2, and necessary data is directly obtained through serial communication.

Problems to be Solved by the Invention However, the method shown in FIG.
Since Ma is required, the hardware becomes complicated, and in addition, many data lines are required to perform parallel communication. Furthermore, although the method shown in FIG. 3 simplifies the hardware, it is difficult to achieve high-speed communication because serial communication is performed. flJ Eva, when the controller 3 asks the system controller 2 about the current time, the system controller first queries the timer module 1, and then returns the response to the controller 3. There was a problem in that the replies to the message were not completed within the scheduled time. For this reason, the system computer 2 had to receive the necessary data from the timer module 1 in advance.

In view of the above problems, the present invention provides a high-speed serial communication method that does not require dual port RAM and has a simple configuration using only two gate circuits. It is intended to provide.

Means for Solving the Problems In order to achieve the above object, the present invention makes the protocols for both the serial communication between the timer module and the system controller, and the serial communication between the system controller and the controller the same,
These serial communications can be done simply by switching the gate.
It has a unified configuration.

Operation The present invention has the above-described configuration, and by making the hardware protocol and software protocol the same for both the serial communication between the timer module and the system controller, and the serial communication between the system controller and the controller, the time relationship from the controller can be improved. Since the main module directly returns commands to the controller without intervening the system controller, the hardware becomes simpler, and furthermore, the system controller does not need to have the timer module receive or store data in advance.

Embodiment FIG. 1 is a pronk diagram showing the high-speed serial communication method of the present invention. In FIG. 1, a timer module 1 has a serial input terminal 11 and a serial output terminal 12. 2 is a system controller with a serial input terminal 21, a serial output terminal 22, and a switching signal output terminal 23 for each gate.
．． It has 24,25°26. A controller 3 has a serial input terminal 31 and a serial output terminal 32.

5 is game) A, and gate person 5 makes the signal input by timer module 3 the signal from system controller 2, but controller 5)
Switch the signal from O-ra 3 to signal output terminal 2
Switch based on the output from 3.

Reference numeral 6 denotes a gate B, which switches the signal input by the system controller 2 between a signal from the timer module 1 and a signal from the controller 3 based on the output from the all-switching signal output terminal 24. The end is gate C, and the gate C is a switch that switches the signal sent to the controller 3 to be the signal from the timer module 1 or the signal from the system controller 2 based on the output from the signal output terminal 25. It is. 8 is gate D and gate D8
sends out the signal input to the input terminal 81 to the output terminal 82 as the control quadrant 830 input signal KL.

The operation of the high-speed serial communication method configured as described above will be described below.

In FIG. 1, a command signal output from the output terminal 32 of the controller 3 is simultaneously sent to the timer module 1 through the gate controller 5, and to the system controller 2 through the gate B6i. If the command signal from the controller 3 is a command for the system controller 2, the system controller 2 outputs the output terminal 2.
Output signal from 2) Game) C completed and Game) D8i
A reply is returned to the controller 3 through the process. At this time, the master module 1 receives the command from the controller 3, recognizes that the command is directed to the system controller 2, and does not send any reply.

Next, if the command from the controller 3 is for the timer module 1, the system controller 2 switches the gate C7 and receives the reply from the timer module 1.
Return to La3. During this time, the system controller 2 also switches the gate B6, intercepts the response from the timer module 1, and grasps the timing to return each gate to its original state.

As described above, according to this embodiment, the communication lines between the timer module 1, the system controller 2, and the controller 3 are gated, and the protocols for each communication are the same, thereby simplifying the hardware implementation. Moreover, since it is not necessary to perform all communication between the timer module 1 and the system controller 2, very high-speed communication can be achieved.

Effects of the Invention As described above, the present invention enables extremely high-speed communication with an extremely simple circuit configuration, and is therefore extremely useful in practice.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a high-speed serial communication method according to an embodiment of the present invention, and FIGS. 2 and 3 are book diagrams showing a conventional communication method. 1°゛°・Timer module, 2...System controller,
3... Controller, 5... Gate A
, 6...Gate B17...Gate C, 8
・・・・・・Name of Gate D0 agent Patent attorney Toshio Nakao and one other person Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] It has a serial line for externally controlling the video tape recorder, a serial line owned by a system controller that controls the video tape recorder, and a serial line owned by a timer module that manages time-related processing, and the three serial lines 1. A high-speed serial communication method characterized by performing high-speed serial communication using a gate circuit that controls the usage state of the .