JPS61117632A - Watchdog timer - Google Patents

Abstract

PURPOSE:To monitor the state at the system power-on time by connecting an automatic operation controller to an information processing system and providing a time out detecting means, a power supply state monitor means, etc. which are suitable for unattended operation of the system. CONSTITUTION:An automatic operation controller 5, a power supply controller 2, and a watchdog timer 4 are connected to an information processing system 1, and the timer 4 consists of time out detecting parts 10 and 14, a power supply state monitor part 13, a power-off command part 12, etc. If the power-on operation is not completed during the power supply to the system 1 to fail in power-on, the monitor part 13 receives the power supply signal as it is, and overflow occurs in a timer register part 13. The detecting part 14 detects the time out and reports this state to the monitor part 13, and the monitor part 13 outputs a power-off command to the controller 2 through the command part 12 to turn off the power source of the system 1. Thus, the timer 4, etc. are provided to monitor the state at the system power-on time, and the failure in power-on can be effectively coped with.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a watchdog timer used in a power-on operation of an information processing system.

(Prior Art) A conventional watchdog timer (WDT) monitors whether or not there is an abnormality in the information processing system after the power-on operation of the information processing system is completed and the information processing system has started up. When an abnormality is detected that means the watchdog timer times out, the Ichigen Control System! It was outputting a power-off command to turn off the power to the information processing system. If you line up, I! FIG. 8 is a block diagram showing an example of the use of a watchdog timer according to the prior art. In FIG. II8, 1 is an information processing system, 2 is a power supply control device, and LO is a watchdog timer. Such watchdog timer 3 was not used together with the automatic operation control device.

(Problem to be Solved by the Invention) Such a limitation on automatic operation is that when the power-on operation of the information processing system fails, some devices included in the information processing system may be unnecessarily powered off or This was added because there was a drawback that it was left unused.

An object of the present invention is to receive a timer start/reset command from a central processing unit, and to receive a signal from a power supply control unit to turn on power to an information processing system within a predetermined time. Provided is a watchdog timer configured to eliminate the above drawbacks by outputting a serious emergency disconnection command for the information processing system to the power control device and the power supply control device, and also to monitor the state of the information processing system when the power is turned on. It's about doing.

(Means for Solving the Problems) According to the present invention, a watchdog timer is connected to an information processing system and a power control all device, and can operate in conjunction with the operation of an automatic driving control device. , a timeout detection means, a power cutoff state monitoring means, and a single source cutoff command means.

The timeout detection means may be for detecting a timeout by receiving a timer start/reset command from a central processing unit within the information processing system.

The power-on state monitoring means receives a state signal for turning on the power to the information processing system from the power control device threshold and monitors the state.

The power-off command means is for outputting an emergency power-off command for the quantity source of the information processing system to the power supply control device based on the abnormality information from the time-out detection means and the power-on state monitoring means.

(Example) Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram illustrating one use of a watchdog timer according to the present invention. @] In the figure, 1 is the information processing system, 2 is the power supply control device, 4 is the watchdog timer (WDT), and 5 is the automatic operation control device (AOC).
) deroru. The signal #j21 connecting the information processing system 1 and the watchdog timer 4 is a transfer interface for command information (for example, timer start/reset command) from the information processing system 1. The trust bag 22 that connects the information processing system 1 and the automatic operation control rack f115 is an interface for information transfer that transfers information such as power on/off time information from the information processing system 1 to the automatic operation control device 5. be. The damaged wire 23 connecting the watchdog timer 4 and the power supply control device i12 is a corner source emergency disconnection command signal line. The signal line 24 is a power-on status display signal line when the information processing system 1 is powered on. A signal line 25 connecting the power control SIl system 2 and the information processing system 1 is an interface for controlling the power to the information processing system 1. The signal line 26 connecting the automatic operation control device 5 and the power supply control device f2 is connected to
It depends on the interface for disconnection startup.

FIG. 2 shows a block diagram illustrating in detail the watchdog timer 4 according to the invention. In FIG. 2, the watchdog timer 4 includes a command analysis section 6, a timer reset section 7, a timer start section 8, a first timer register section 9, a first tie-out detection section 10, and a clock pulse A generation unit 11, a power-off command unit 12, a power-on state monitoring unit 1, a second timeout detection s14,
It is composed of a second timer register section 15. In the figure, point A is the connection point between the watchdog timer 4 and the central processing unit of the information processing system 1, and points B and B are both the connection points between the watchdog timer 4 and the power supply control device 2.

Next, the embodiments of the present invention described above will be described in detail.

At a certain time, the automatic operation control device 5, which can automatically turn on and start the power, sends an Ichihara power-on start signal to the power control device #2, and the power control device 12 turns on each pipe inside the information processing system 1. Executes power-on operation for.

At the same time, a power-on signal is sent from the deaf source control device 2 to the watchdog timer 4, and the power-on state monitoring unit 16 inside the watchdog timer 4 monitors the signal, and at the same time, the second timer register signal is sent to the watchdog timer 4. 150 count up operation is started.

When the power-on operation of each device disposed inside the information processing system 1 from the power supply control unit WR2 is completed, the power supply control unit @2 resets the power-on signal sent from watchdog timer No. 4. do. Therefore, the start status monitoring section 13 inside the watchdog timer 4 detects the reset of the above-mentioned signal, stops the count-up of the timer register s15 at tA2, and starts the second timer register section 1.
Reset 5.

At this dark spot, the central processing bag # (not shown) of the information processing system 1 is connected to the watchdog timer 4f.
A count-up start command for counting up the timer register 9 of 1 is output. This command is analyzed by the command analysis section 6, and a timer start command is sent to the timer start section 8. The timer start section 8 instructs the timer register section 9 of the Hayabusa to start counting up, and the first timer register section 9 starts counting up.

After this, the central processing unit of the information processing system 1 outputs a timer reset command for the timer register section 9 of 81 at fixed time intervals, which is analyzed by the command analysis section 6, and a timer reset command is sent to the timer reset section 7. be done. In the timer reset section 7, the ml timer register section 9
The timer register section 9 of [siL] is reset again.
Perform count-up operation. If any abnormality occurs in the information processing system 1, the timer reset command for the first timer register section 9 will no longer be output from the central processing unit W (not shown). The time-out detection unit 10 of [1] detects an overflow of the tile register unit 9 of [1] and instructs the power cut-off command unit 12 to turn off the power. Therefore, from the power cut-off command unit 12, a single source control device is installed! A power-off signal is output to 2, and the source of the information processing system 101 is cut off.

The above description is a series of operations of the watchdog timer 4 of the present invention when power to the information processing system 1 is normally completed.

Next, if the power-on operation is not completed during power-on of the information processing system, 1. The operation of the watchdog timer 4 in the case of power-on failure will be explained.

When the power-on state deaf monitoring section 1S of the watchdog timer 4 receives the power-on signal, the timer register section 15 of the Hayabusa 2 remains in a count-up state without being stopped. An overflow occurs in the timer register section 150. Therefore, the second timeout detection unit 14
Then, the timeout is detected and the power-on status monitoring unit 13#
Report the status here. Therefore, 1. The power-on state deaf vertical viewing unit 13 outputs a one-source disconnection command to the power-off command unit 12, causes the power supply SR control unit @2 to output an emergency power-off command, and urgently disconnects the power of the information processing system 1.

Note that the timer register section 2 and second timeout detection section 14 of sL2 are assumed to be separate from the timer register section 9 and first timeout detection section 10 of t4 for the sake of explanation, but in implementation, It can also be included in the timer register section 9 and first timeout detection section 10 of Hayabusa 1 and realized at low cost.

(Effects of the Invention) As explained above, the present invention connects an automatic operation control device to an information processing system and provides a plurality of means suitable for A to operate the information processing system unmanned, so that when one source input fails, This also has the effect that some devices inside the information processing system are not left unnecessarily powered on.

[Brief explanation of the drawing]

! FIG. 1 is a block diagram illustrating an example of the use of a watchdog timer according to the present invention. FIG. 2 is a detailed block diagram of a watchdog timer according to the present invention. Figure $8 is a block diagram showing an example of a watchdog timer according to the prior art. 1... Information processing system 2... Power supply control device, 4... Watchdog timer 5... Automatic operation control device 6... Command analysis section 7, fist/timer reset section 8... Timer Start part 9.15...Conflict timer register detection part 10.14ψ...Timeout detection part 11...Clock pulse generation part 12...Power cut-off command part 1ro...Power-on state monitoring part

Claims (1)

[Claims] A watchdog timer that is connected to an information processing system and a power supply control device and can operate in conjunction with the operation of the automatic operation control device, and is capable of starting/resetting the timer from a central processing unit inside the information processing system. timeout detection means for receiving a command and detecting a timeout; power-on state monitoring means for receiving a state signal for powering on the information processing system from the power supply control device and monitoring the state; and a power-off command means for outputting an emergency power-off command for the information processing system to the power supply control device based on the abnormality information from the time-out detection means and the power-on state monitoring means. Features a watchdog timer.