JPH0458480A - Inserting/extracting device for hot line - Google Patents

Abstract

PURPOSE:To assure a reliable reset when a circuit board is inserted or removed and prevent an adverse effect to the main body device side by the malfunction of the circuit board when a hot line is inserted or removed by synthesizing a reset signal generated by the connection of a reset terminal and a reset signal sent from a reset signal generation section with a connecting means for use as the reset signal output of the circuit board. CONSTITUTION:A reset signal generation section 15 has a power-on reset generation section 16 and a power-low reset generation section 19, and the power-on reset signal and the power-low reset signal are connected to a connecting means 20 via reset signal paths 17, 18 connected in common. The connecting means 20 is connected to a reset terminal 14d, the reset signal from the reset terminal 14d and the reset signal from the reset signal generation section 15 are synthesized to output a negative reset signal output 21. The output signal of the power-on reset generation section 16 is generated in the period (b) from the time when Vcc becomes the voltage V1 or above until the power-on reset signal is turned off, and the reset period (c) at the time of insertion is determined by the synthesis of the reset signals.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hot-line insertion/extraction device for inserting/extracting a circuit board while a main unit is in operation.

(Prior Art) Some of various information processing devices have circuits distributed and mounted on removable boards in order to facilitate operations such as maintenance and inspection.

In such devices, a large number of female connectors are usually attached to the main unit, and each circuit board is connected to the main unit via these connectors. Furthermore, such an information processing apparatus is configured to allow so-called hot insertion and removal, so that each circuit board can be inserted and removed while the apparatus is in operation. In this case, when the circuit board is inserted into or removed from the main device, noise may enter other circuits through the connector, resulting in malfunction or the like.

To prevent this, the circuit board is equipped with a reset signal generation section, and when it is inserted or removed, the internal circuit is initialized by the reset signal from this reset signal generation section, and the circuit board in this initialized state is inserted or removed from the main unit. There is something I tried to do.

FIG. 2 shows such a conventional hot insertion/extraction device.

In FIG. 2, the main unit 1 includes a card edge connector (hereinafter simply referred to as a connector) 3 as a connector for inserting and removing a circuit board 2. As shown in FIG. This connector 3 includes a GND (ground) contact 3a for ground potential, a Vcc contact 3b for supplying DC power to the circuit board 2, and a general signal contact 3c for sending and receiving general signals such as address, data, control, etc. ing.

The circuit board 2 is provided with a terminal portion 4 corresponding to the connector 3, and a GND terminal 4 corresponding to the GND contact 3a is provided.
a, a VCC terminal 4b corresponding to the Vcc contact 3b, and a general signal terminal 4C corresponding to the general signal contact 3C. Further, in order to realize a connection time difference between the GND terminal 4a and the GND terminal 4a, the tip of the VCC terminal 4b is provided at a position slightly retreating from the tip positions of the GND terminal 4a and the general signal terminal 4c. That is, since the main device 1 and the circuit board 2 are inserted and removed during the operation of the device composed of them, in order to protect the internal circuits of the circuit board 2, the circuit board 2 is
is configured to receive power supply after its GND is connected to the GND of the main unit 1.

Further, the circuit board 2 is provided with a reset signal generation section 5 that generates a reset signal for initializing an internal control circuit (not shown).

The reset signal generation unit 5 includes a power-on reset generation unit 6 that sends out a power-on reset signal via the reset signal path 7 when the circuit board 2 is inserted, and a power-on reset generation unit 6 that detects a voltage drop in VCC when the circuit board 2 is pulled out. and a power low reset generating section 9 which sends out a power low reset signal via a reset signal path 8, and the reset signal paths 7 and 8 are commonly connected to generate a power low reset signal and a power low reset signal. Reset signal output 1
0 is formed. Incidentally, the power-on reset generating section 6 and the power-low reset generating section 9 are composed of known comparison circuits and flip-flops.

In the figure, position A is the tip position of the GND terminal 4a and general signal terminal 4C in the terminal section 4 of the circuit board 2, position B is the tip position of the VCC terminal 4b, and position E is the tip position of the connector 3.
This is the position where the terminal part 4 is connected to the contact position F of the connector 3 when the insertion is completed.

Next, the operation of the hot insertion/extraction device having the above configuration will be explained.

FIG. 3 is a reset operation time chart of the above-mentioned conventional hot-swapping device, and FIG. 3(a) shows the power supply voltage V of the circuit board 2.
CC2 (b) shows the reset signal output 10. In addition, in the same figure, connection A and connection B indicate the start times of connections between position A, position F9, position B, and position F, respectively, when the circuit board 2 is inserted, and separation B9 and separation A respectively indicate the positions when the circuit board 2 is pulled out. B and position F1 shows the connection time between position A and position F.

First, when inserting the circuit board 2, first connect the GND terminal 4.
a, General signal terminal 4c is GND contact 3a of connector 3
, contacts the general signal contact 3c, but since the VCC terminal 4b does not contact the VCC contact 3b, VCC is zero during the period from connection A to connection B.

Next, at the time of connection B, VCC terminal 4b changes to VCC contact 3b.
When the contact point F is contacted, Vcc rises from this time. And V. When C exceeds the operation guarantee level (1) of the reset signal generation section 5, specifically, the IC operation guarantee level, the power-on reset generation section 6 sends out a power-on reset signal of negative polarity.

The power-on reset generating section 6 sends out a power-on reset signal for a predetermined period of time. During period a) in FIG. 3, the internal control circuit of the circuit board 2 is initialized. As a result, when inserting the circuit board 2 into the main unit 1, the -Ja9 signal terminal 4c
The circuit board 2 is brought into an initialized state so as not to affect the form W on the main body device 1 side via.

In addition, when the circuit board 2 is pulled out from the main device 1, the VCC terminal 4b is connected to the VCC contact 3 of the connector 3 at the time of separation B.
Since there is no contact with contact position F of b, from this time VC
C begins to fall and when it drops to the voltage drop detection level v2, the power low reset generation section 9 generates a power low reset signal of negative polarity. . The signal is transmitted for a predetermined period of time (period b in FIG. 3) until the operation guarantee level ■1 is reached.

Therefore, even when the circuit board 2 is removed, the circuit board 2 is initialized in the same way as when it is inserted, and an adverse effect on the main body device 1 side is prevented. Also, before the GND terminal 4a is separated from the GND contact 3a, the Vcc terminal 4b is connected to the VCC terminal 3.
Since the circuit board 2 is separated from the circuit board 2, application of abnormal voltage or the like to the circuit board 2 is prevented, and the internal circuit is protected.

(Problem to be Solved by the Invention) However, in the conventional hot-line insertion and removal device described above, since the reset signal generation unit 5 itself is operated by the power supplied to the circuit board 2, the reset signal is generated at the rise and fall of the power supply. There was a period that could not be guaranteed. That is, when the circuit board 2 is inserted, the period C from connection A in Fig. 3 until VCC becomes the voltage V is a reset uncertainty period, and when the circuit board 2 is removed, the VCC becomes less than the voltage ■ and is separated. A
The period d until then becomes the reset uncertainty period.

Therefore, when the circuit board 2 is inserted, the reset uncertainty period C
During this period, an erroneous signal is sent to the main unit 1 via the general signal terminal 4C.
There was a problem that the signal could be transmitted to the other circuits, and as a result, other circuits would be adversely affected. Also, when the circuit board 2 is pulled out, the valid period of the power low reset signal is a short period from Vcc v2 to V+, and the reset uncertainty period d is until the removal is completed.
There was a possibility that the circuit inside the circuit board 2 could not be completely initialized when the circuit board 2 was pulled out.

The present invention has been made to solve the above-mentioned problems, and it is possible to ensure a reliable reset when inserting and removing a circuit board, and to prevent an adverse effect on the main unit side due to malfunction of the circuit board during hot insertion and removal. The purpose of the present invention is to provide a hot-line insertion/extraction device that can be used.

(Means for Solving the Problems) A hot-line insertion/extraction device of the present invention is provided with a circuit board to be inserted/extracted from a connector of a main unit, and a predetermined time difference from the start of the insertion/extraction operation during insertion/extraction. a reset signal generation unit that outputs a reset signal to initialize the circuit of the circuit board; and a reset signal generation unit that is provided on the circuit board and is configured to control the circuit board from the start of insertion into the connector of the main device, during insertion, and when the circuit board is removed. a reset terminal that is connected to a ground contact of the connector of the main device from the middle until the completion of the extraction, generates a reset signal for initializing the circuit of the circuit board depending on the connection state, and becomes disconnected when the insertion is completed;
Connecting means is provided for connecting the reset signal path of the reset signal generation section and the reset terminal, and for synthesizing the reset signal output from the reset signal generation section and the reset signal of the reset terminal to form a reset signal output. It is something that

(Function) The hot-line insertion/extraction device of the present invention combines a reset signal caused by the connection of the reset terminal and a reset signal sent from the reset signal generation section by the connecting means to output a reset signal of the circuit board. In this case, the reset terminal generates a reset signal from the start of insertion of the circuit board to the middle of insertion and from the middle of removal to the completion of removal. Therefore, when inserting a circuit board, reset is guaranteed from the start of insertion, and when removing the circuit board, reset is guaranteed until removal is completed. Ru. As a result, the circuit board can be reliably brought into a reset state during hot insertion and removal.

(Example) Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

FIG. 1 is a diagram showing an embodiment of the hot insertion/extraction device of the present invention.

The main body device 11 includes a card edge connector (hereinafter simply referred to as a connector) 13 for connecting a circuit board 12, as in the conventional case. This connector 13 has a GND contact 13a, a Vcc contact 13b, and a general signal contact 13c similar to the conventional one, and also has a GND contact 13d for connecting a reset terminal to be described later.

The terminal portion 14 of the circuit board 12 is provided with a GND terminal 14a, a Vcc terminal 14b, a general signal terminal 14c, and a reset terminal 14d as in the conventional case.

The reset terminal 14d has its tip located at the same tip position as the GND terminal 14a and the general signal terminal 14c,
That is, it is position A in Figure 1, and the rear end position is VCC.
It is provided at a position (position C in FIG. 1) that is slightly retreated from the tip position of the terminal 14b (position B in FIG. 1).

In FIG. 1, positions E and F are the contact positions of the terminal portion 14 and the connector 13, respectively, when the circuit board 12 is completely inserted.

The reset signal generation section 15 has a power-on reset generation section 16 and a power-low reset generation section 19 as in the conventional case, and the respective power-on reset signals and power-low reset signals are transmitted through commonly connected reset signal paths 17 and 18. It is connected to the connection means (forced grounding wire) 20 through the connection means (forced grounding wire).

Further, the connecting means 20 is connected to the reset terminal 14d, and combines the reset signal from the reset terminal 14d with the reset signal from the reset signal generation section 15,
A reset signal output 21 of negative polarity is sent out.

Next, the operation of the hot insertion/extraction device having the above configuration will be explained.

FIG. 4 is a reset operation time chart of the hot-swapping device, and FIG. 4(a) shows the power supply voltage VCC of the circuit board 12.
1 (b) shows the signal output of the reset signal generation section 15, (C) shows the reset signal from the reset terminal 14d, and (d) shows the reset signal output 21. Also,
In the figure, connections A and B and separations B and A are similar to the conventional case, and the connection start time between positions A and B and position F when the circuit board 12 is inserted and positions B and A when the circuit board 12 is pulled out. The connection time with position F is shown. Furthermore, separation C and connection C are the times at which the rear end position C and position F of the reset terminal 14d are connected when the circuit board 12 is inserted and removed, respectively.

First, when inserting the circuit board 12, G
ND terminal 14a and general signal terminal 14c are connector 13
are first connected to the GND contact 13a and the -pre-signal contact 13c. At the same time, the reset terminal 14d is set to G.
It is connected to the ND contact 13d, and as a result, a reset signal of negative polarity is generated by the reset terminal 14d via the connection means 20 at the same time as the insertion starts, that is, from the time of connection A.

Next, at the time of connection B, the ■cc terminal 14b is connected to the ■cc contact 13b, power is supplied to the circuit board 12, and V
When CC reaches the guaranteed operation voltage (1), the power-on reset generator 16 turns on and sends out a power-on reset signal of negative polarity. At this point, the reset terminal 14d is still G.
Since it is in contact with the position F of the ND contact 13d, the power-on reset signal generates the reset signal output 21 together with the reset signal from the reset terminal 14d.

If the insertion is continued further, the rear end position C of the reset terminal 14d
passes through position F of GND contact 13d, and reset terminal 1
4d and the GND contact 13d are disconnected, so the reset signal from the reset terminal 14d is turned off at the time of separation C. However, since the power-on reset signal is valid at this point, the reset signal output 21 does not turn off immediately, but continues to be sent until the power-on reset signal is valid.

That is, during the period a from connection A to separation C, reset terminal 1
The period from the time when cc becomes 73 or higher until the power-on reset signal is turned off is the power-on reset generation unit 1.
The reset period C at the time of insertion is determined by combining these reset signals.

Note that since the period a from connection B to separation C is not constant depending on the insertion work of the circuit board 12, the off time of the reset signal from the reset terminal 14d is the same as the off time of the power-on reset signal that is output for a predetermined period of time. However, even in this case, the reset period C only becomes longer and does not particularly affect the reset operation of the circuit board 12.

Next, when pulling out the circuit board 12, since the insertion is completed, the reset terminal 14d is connected to the GND contact 13d.
is in a non-contact state with position F, and the reset terminal 14d
The reset signal is not output. Furthermore, since the power supply voltage VCC is maintained at a predetermined level, the power low reset signal is not output from the power low reset generation section 19. Next, when the withdrawal is started, the reset terminal 14d starts contacting the contact position F (time of connection C), and from this point until the time of separation A when the withdrawal is finally completed, the reset signal output 21 is generated by the reset signal of the reset terminal 14d. is generated.

Further, at the time of separation B, the VCC terminal 14b is disconnected from the contact position F, and VCC decreases to the voltage drop detection level V.
2 or less, the power low reset generation unit 19 sends out a power low reset signal up to the guaranteed operation voltage v1 [period d in FIG. 4(b)]. This power low reset signal generates the reset signal output 21 via the connection means 20, but during this period, the reset by the reset signal from the reset terminal 14d is confirmed, so the signal state of the reset signal output 21 does not change. not give. That is,
The reset period e at the time of withdrawal is the period from connection C to separation A, which is the connection period between the reset terminal 14d and the contact position F.

In this way, in the above-mentioned hot-line insertion/extraction device, in order to guarantee the reset signal output from the reset terminal 14d even during the reset uncertainty period of the power-on reset generation unit 16 [period f in FIG. 4(b)] when the hot-line insertion/extraction device is inserted, It is possible to eliminate the undefined reset period of the circuit board 12 as in the conventional case.

Furthermore, even when the power is pulled out, the reset terminal 14d is
Since the reset is determined by the reset signal, the reset can be performed reliably, and the reset can be guaranteed even during the period g, which was conventionally undetermined when the power supply voltage Vcc is at the circuit operation guaranteed level (2) and below.

(Effects of the Invention) According to the above-described hot-swapping device of the present invention, the reset terminal is provided on the circuit board, and the reset terminal and the signal path of the reset signal generation section are connected by the connecting means to generate the reset signal of the circuit board. Since the output is generated, reset is guaranteed even during a previously undefined period when a circuit board is inserted or removed from the main unit, and therefore there is no adverse effect on the main unit due to malfunction of the circuit board during hot insertion or removal. It can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the hot insertion/extraction device of the present invention;
FIG. 2 is a configuration diagram showing a conventional hot-swapping device, FIG. 3 is a time chart showing the reset operation of the conventional hot-swapping device, and FIG. 4 is a time chart showing the reset operation of the hot-swapping device of the present invention. It is a chart. DESCRIPTION OF SYMBOLS 1... Main unit, 12... Circuit board, 3... Connector, 13d... GND contact, 4... Terminal part, 14
d... Reset terminal, 5... Reset signal generation section, 7.18... Reset signal line, 20... Connection means,
1...Reset signal output.

Claims (1)

[Scope of Claims] A circuit board that is inserted into and removed from a connector of a main body device, and a circuit board that is provided on the circuit board and initializes the circuit of the circuit board with a predetermined time difference from the start of the insertion and removal operation when the insertion and removal are performed. a reset signal generation unit that outputs a reset signal to generate a reset signal; and a reset signal generating unit that is provided on the circuit board, and that is provided on the circuit board to generate a ground for the connector of the main body device from the start of insertion of the circuit board into the connector of the main device until the middle of insertion and from the middle of removal to the completion of removal. a reset terminal that is connected to a contact, generates a reset signal that initializes the circuit of the circuit board according to the connection state, and becomes disconnected when the insertion is completed; and a reset signal path of the reset signal generation section and the reset terminal. A hot-line insertion/extraction device, characterized in that it is provided with a connecting means for connecting a reset signal outputted from the reset signal generating section and a reset signal of the reset terminal to form a reset signal output.