JPH0664510B2 - Card equipment that can be installed live - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a card device having a built-in logic circuit and connected to a common bus via a bus driver / receiver and a bus connector to constitute an information processing device, and more particularly, to a card device. The present invention relates to a card device that can be mounted in a system operating state (live line state).

[Conventional technology]

FIG. 2 is an external view showing a configuration example of an information processing device and a card device.

That is, the information processing apparatus is configured by mounting a power supply unit 11 and a plurality of card devices 10 on a shelf 20, and the card device 10 is configured by mounting a bus connector 1, a power connector 2, and a logic circuit (not shown) on a board. To be done.

By the way, if some kind of failure occurs in the card device configured as described above, the old one must be removed and replaced with a new one. So, when installing a new one, it is +5 in the past when removing it.
To the power supply connector 2 having V, GND (ground) and a reset terminal, a power supply and a reset signal are supplied from the power supply section 11 of the shelf 20 in advance using the cable 30, and then the card device is mounted. The reset signal is given to reset a bus driver / receiver (not shown), which makes the common bus high impedance and prevents the bus from being disturbed by the installation of a new card device.

[Problems to be solved by the invention]

However, in the conventional device as described above, not only a complicated operation of manually supplying power and a reset signal to the card device is required, but also if the card device is mounted without forgetting such an operation, the bus will not operate. Disturbed,
In some cases, there is a problem that the system goes down.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a card device that can be hot-line mounted without the need for performing the complicated operations described above.

[Means for solving problems]

To each of the card devices, a power connector that has a contact structure where the power enters earlier than the bus connector, is connected to the power connector via a resistor to limit the inrush current, and the power terminal of the bus connector A capacitor that is directly connected and supplies a voltage across its terminals to the logic circuit;
A reset circuit that compares the voltage between the terminals of the capacitor with a predetermined value and resets the bus driver / receiver when the voltage between the terminals is equal to or less than the predetermined value is provided.

[Action]

If the power connector allows the power to be input earlier than the bus connector, the reset circuit will reset the bus driver / receiver from the time the power is turned on until a predetermined time elapses after the power is turned on to the bus connector. By setting the common bus to a high-impedance state, hot-line mounting becomes possible.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention, showing an internal configuration of a card device 10. In the figure, 1 is a bus connector, 2 is a power connector, 3 is a logic circuit, 4 is a comparator, 5 is a bus driver / receiver, R is a resistor for limiting inrush current, and C is a capacitor (pass capacitor).

Here, for example, the contact of the power connector 2 is the bus connector 1
It is formed longer than that of the bus connector 1 so that the power is turned on earlier than the bus connector 1. Therefore, when the power supply connector 2 is inserted into the power supply, the power supply is first supplied to the logic circuit 3 and the comparator 4 via the inrush current limiting resistor R. At this time, the inrush current limiting resistor R
To prevent inrush current due to bypass capacitor C,
Prevents voltage drop on the bus power line. In addition, the voltage inside the card becomes Vi due to the voltage drop due to this resistance R,
At this voltage, the card logic circuit 3 can operate normally and is set to be lower than the monitor comparison voltage Vs of the comparator (reset circuit) 4. Therefore, the comparator 4 sends the reset signal RTS to the bus driver receiver 5. Give and reset this. As a result, the bus is in a high impedance state, so that even if the card device is mounted, the signals on the bus are not disturbed and the operation of other card devices is not adversely affected. The comparator 4
The set voltage is set to be higher than the voltage at which the logic circuit of the card device can operate and lower than the upper limit of the voltage for resetting the bus driver / receiver. After that, when power is supplied to the bus connector 1, the comparator 4 drops the reset signal RST after a fixed time, so that the reset of the bus driver / receiver 5 is released and the normal operation starts. The reason why the fixed time is taken here is to guarantee the time for releasing all resets in consideration of variations in the operation of the plurality of bus connectors.

〔The invention's effect〕

According to the present invention, since the card device side is provided with the functions for supplying the power supply and the reset signal, it is not necessary to manually supply the power supply and the reset signal, and it is possible to perform the operation during operation. The card device can be installed without stopping the system. So not only is online maintenance easier,
Since the failure can be recovered in a short time, it becomes possible to construct a highly reliable system.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is an external view showing a general configuration example of an information processing device and a card device. Explanation of symbols 1 ... Bus connector, 2 ... Power connector, 3 ... Logic circuit, 4 ... Comparator (reset circuit), 5 ...
… Bus driver / receiver, 10 …… Card device, 20 ……
Shelf, 30 ... Cable, R ... Inrush current limiting resistor, C ... Capacitor (pass capacitor).

Claims (1)

[Claims] 1. A plurality of card devices, each having a built-in logic circuit and connected to a common bus via a bus driver / receiver and a bus connector, to form an information processing device, have a power source earlier than the bus connector. A power supply connector having a contact structure for connection, the power supply connector is connected through a resistor for limiting an inrush current, and is directly connected to a power supply terminal of the bus connector, and the voltage between the terminals is connected to the logic circuit. And a reset circuit for comparing the terminal voltage of the capacitor with a predetermined value and resetting the bus driver / receiver when the terminal voltage is equal to or lower than a predetermined value. A hot-line card device that can be connected to a common bus.