JPH04310193A - Ic card insertion/ejection detecting circuit - Google Patents

Abstract

PURPOSE:To prevent any abnormal condition such as run-away or the like by automatically restarting a system when an IC card is inserted/ejected while operating the system of an information processor. CONSTITUTION:At the information processor, a detection circuit 3 is provided to detect the state of loading an IC card 1. When the IC card 1 is loaded or ejected after the system is activated, the detection circuit 3 resets the entire system, and the system is restarted.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit for guaranteeing operation in information processing equipment such as personal computers and word processors when an IC card is inserted or removed during system operation.

0002

[Prior Art] When inserting or removing an IC card for expansion memory into information processing equipment such as a conventional personal computer (hereinafter referred to as a personal computer) or a word processor (hereinafter referred to as a word processor), it is difficult to attach or remove an IC card for expansion memory. However, since the main body case had to be disassembled, it was impossible to insert or remove the IC card while the system was in operation. However, in recent years, IC cards have been standardized by the Japan Electronics Industry Promotion Association, allowing users to easily expand their memory capacity, and information processing equipment can also insert and remove IC cards while the system is operating. The structure is as follows.

0003

[Problems to be Solved by the Invention] Even if the IC card is removable in the above-mentioned conventional technology, it is difficult to remove the IC card during system operation.
There was a problem in that normal operation of the information processing equipment could not be guaranteed if the card was inserted or removed. The present invention is to restart the system when a user accidentally inserts or removes an IC card while the system is operating.

[0004] Similarly, the system can be restarted and the IC
A warning is displayed on the display of the information processing equipment to prevent the card from being inserted or removed again.

[0005]

[Means for Solving the Problems] In order to achieve the above object, in the case of a dedicated IC card unique to a manufacturer, a terminal for detecting card insertion/removal is provided in the connector. Furthermore, the IC card standardized by the Japan Electronics Industry Promotion Association uses a dedicated detection terminal.

[0006] A detection circuit within the information processing equipment detects the signal from the detection terminal of the IC card, and if the IC card is inserted or removed while the system is operating, the entire main body is reset.
Restart the system.

Furthermore, in this case, after the system is restarted, a warning is displayed on the display section of the information processing device.

[0008] With the above means, even if the IC card is inserted or removed while the power is on, the entire main body is reset and the system is restarted, so that the information processing equipment main body does not continue to operate abnormally. It can be prevented.

[0009]

[Operation] The terminal on the main circuit side connected to the detection terminal of the IC card is always pulled up to the 5V (Vcc) power supply via a resistor. When the IC card is connected during system operation, the detection signal changes from 5V (hereinafter referred to as high level) to ground level (GND, hereinafter referred to as low level). Further, if the IC card is connected and removed while the system is operating, the detection signal changes from low level to high level. By detecting a change in the level of this detection signal, a signal for resetting the main body is generated.

[0010]Furthermore, the fact that the IC card has been inserted or removed during system startup is stored in the information processing equipment, and after the system is restarted, a warning is displayed on the display section of the information processing equipment.

[0011] Furthermore, when the information processing device is in power save mode, resume mode, etc., the main body functions are stopped but only some functions are energized. It also detects the insertion and removal of an IC card and resets the main body.

0012

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

[0013] In the case of a manufacturer's own dedicated IC card,
Two detection terminals are provided, and a similar terminal is provided on the information processing equipment main body side 2. Connect the detection terminal on the dedicated IC card side to ground level. Also, standard IC card
In the case of 36-pin and 67-pin detection terminals as shown in FIG. When the IC card 1 is inserted or removed during system operation, the levels of the detection signals 11 and 12 change. Due to the change in this signal, the detection circuit 3 generates a reset signal 37 (reset signal 52) to the main system 6, and resets the entire system 2.

Further, the internal configuration and operation of the detection circuit 3 shown in FIG. 1 will be explained using FIGS. 2 and 3.

When the power is turned on, the reset circuit 5 shown in FIG. 1 operates, and the reset signals 51 and 52 become active.
The entire system is initialized. At this time, flip-flops 32, 33, and 34 in the detection circuit 3 shown in FIG. 3 detect the mounting state of the IC card 1. That is, when the IC card is not installed, the detection signals 11 and 12 are
Since it is pulled up to V, it becomes a high level, and the output of the AND gate 31 also becomes a high level. And game
Flip-flops 32, 33, and 34 output the output of
It is sampled and held according to the basic clock signal 41. In this case, exclusive OR gate 35 (hereinafter referred to as EXOR gate) is configured such that flip-flops 32, 33, and 34 are
When the sample of the card attachment state is completed, the output becomes low level. The final stage flip-flop 36 receives the reset signal 5
2 is reset until it is released, and the output Q becomes a low level. When the reset signal 52 is released, the output of the EXOR gate 51 is held at the rising edge of the basic clock 41. In this case, since the low level is maintained, the output Q of the flip-flop 36 remains at the low level and does not change. When the reset signal 52 is released, the system starts up. After the system is started, when the IC card 1 is inserted, the detection signals 11 and 12 change from high level to low level, and the output of AND gate 31 also changes to low level. When the flip-flop 32 samples the low level of the AND gate 31 output, the output signal 321 changes from high level to low level, and since the output signal 341 is high level, E
The output of the XOR gate 35 changes from low level to high level. When the flip-flop 36 samples the high level of the output of the EXOR gate 35, the reset signal 37, which is the QN output, becomes low level. Reset signal 37
When becomes low level, the reset signal 52 in FIG. 1 becomes active (low level), and the main system 6 is reset and restarted.

[0016] Also, the I
Even when the C card 1 is removed, the entire system 6 is reset in the same way as when it is inserted.

Furthermore, even when the system is started by the user reset 8, the same detection operation as when the power is turned on is performed.

Next, an embodiment will be described in which a warning is displayed on the display section 6 to the user when the IC card 1 is inserted or removed after the system is started and the system is restarted. . When the IC card is inserted or removed after system startup, the reset signal 37 (flip-flop 3
6 (Q output) becomes low level, and the flip-flop 38 for holding whether or not the IC card 1 is inserted or removed during system startup is set to high level. The state of the output signal 381 of the flip-flop 38 is transmitted to the main body system 6.
is read out during or after restarting, and if it is at a high level, it is determined that the IC card 1 has been inserted or removed, and a warning is displayed on the display section 7 as shown in FIG.

As a result, even if the IC card 1 is inserted or removed during system operation, the system can be restarted.
It is possible to prevent abnormal situations such as runaway behavior. Furthermore, since the user can be warned, it is possible to prevent the user from repeating the same mistake.

[0020]

[Effects of the Invention] According to the present invention, if an IC card is inserted or removed while power is being applied, the entire system can be automatically initialized and restarted, thereby preventing abnormal situations such as runaway. It can be prevented.

[0021] Also, it is possible to insert the IC card while it is energized,
If you unplug it, the entire system will be initialized automatically.
After restarting, a warning can be displayed on the display to prevent you from making the same mistake again.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an IC card and information processing equipment according to an embodiment of the present invention;

[Figure 2] IC cards standardized by the Japan Electronic Industry Promotion Association
pin layout diagram of the

[Fig. 3] IC card insertion/removal detection circuit diagram in the present invention;

[
Figure 4: When inserting and removing an IC card according to an embodiment of the present invention,
An explanatory diagram of a warning to a user.

[Explanation of symbols]

1...IC card, 3...detection circuit, 4...Basic clock, 5...Reset circuit.

Claims (2)

[Claims] Claim 1: An IC card is installed during system startup of information processing equipment.
An IC card insertion/removal detection circuit is characterized in that when a card is inserted or removed, it is detected within the main body and restarts the entire system. 2. The IC card insertion/removal detection circuit according to claim 1, which displays a warning on a display section of the information processing device when the entire system is restarted.