JP3163021B2 - Computer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an HDD (Hard).
The present invention relates to a computer to which devices such as a Disk Drive can be attached and detached.

[0002]

2. Description of the Related Art At present, in a computer, an HDD, a port replicator and the like can be detached and replaced for the purpose of extending functions. Also, recent computers have a suspend-resume function that allows the computer to resume (resume) operation from the state when the power was last turned off (suspend state) when the power was turned on (for example, see Japanese Patent Application Laid-Open No.
No. 279312 (G06F1 / 00)).

In a conventional computer of this type, if the HDD or the like is replaced or removed after shifting to the suspend state, and then resumed, the operation resumes in a state different from the state when shifting to the suspend state. Problems such as program runaway and data destruction occurred.

Accordingly, the applicant of the present application has disclosed in Japanese Patent Application No. 6-144343 (publication: JP-A-8-16270 (G06F1 / 00)) filed on June 27, 1994 that the HDD was replaced in the suspended state. In the case of a computer that detects whether or not it has been removed, it determines whether or not to resume at the time of the resume request.

FIG. 2 is a circuit diagram showing a main part of this type of prior art. A computer main body 1 has a CPU 2, a D-type flip-flop FF3, and a connector 5 for connecting an HDD 4.

The CPU 2 has first and second input ports 6 and 7, and an output port 8. First input port 6
Is connected to the output terminal of the inverting circuit 9, the second input port 7 is connected to the output terminal Q of the FF3, and the output port 8
Is connected to a reset terminal of the FF3 (shown as an inverted R in the figure).

The clock terminal CK of the FF 3 is connected to the output terminal of the inverting circuit 9, and a predetermined voltage VCC is constantly applied to the terminal D and the set terminal (indicated as S in the figure). That is, a high-level signal is always input to the terminal D and the set terminal.

The input terminal of the inverting circuit 9 is connected to a predetermined voltage supply means 10 via a resistor R2. This means 1
0 is a resistance R between the supply end of the predetermined voltage VCC and the ground.
3 and a capacitor C1 are connected in series, and the input terminal of the inverting circuit 9 is connected at a connection point 11 between the resistor R3 and the capacitor C1. The connection point 11 is connected to the connector 5 and the connector 5
When the HDD 4 is mounted on the HDD 4, the HDD 4 is grounded.

In the circuit of FIG. 2, when the HDD 4 is mounted on the connector 5, the potential of the input terminal of the inverting circuit 9 is 0.
V. That is, a low-level signal is supplied to this input terminal, and as a result, a high-level signal is always output from the output terminal of the inverting circuit 9. On the other hand, when the HDD 4 is removed, the potential of the input terminal of the inverting circuit 9 becomes a value close to VCC. That is, a high-level signal is supplied to this input terminal, and as a result, a low-level signal is output from the output terminal of the inverting circuit 9. Therefore, while the CPU 2 is operating, the input port 6
By detecting the input signal, the attachment / detachment of the HDD 4 can be detected.

However, when the CPU 2 is in the suspend state, the input from the input port 6 cannot be detected, but a reset signal (low-level signal) is supplied from the output port 8 to the reset terminal of the FF 3 immediately before the suspend state. By resetting the FF 3, it is possible to detect the replacement of the HDD 4 during suspension according to the resume request.

That is, if the HDD 4 is replaced during the suspend, the output of the inverting circuit 9 changes from the low level to the high level.
By being input to K, the output of the output terminal Q of the FF3 becomes high level. Therefore, by judging the input of the second input port 7 at the end of the suspend, the CPU
2 can determine whether or not the suspended HDD 4 is replaced. The removal of the suspended HDD 4 can be performed only by determining the input to the first input port 6 at the end of the suspension.

As described above, in the prior art shown in FIG. 2, it is possible to determine whether or not the HDD 4 is suspended during the suspension at the end of the suspension. Therefore, the CPU 2 can determine whether or not to execute the resume process based on this determination, thereby preventing a program runaway and data destruction due to replacement or removal of the suspended HDD 4.

[0013]

However, in the above-mentioned prior art, three ports on the CPU 2 for detecting replacement and removal of the suspended HDD 4 are required.
If the number of such detection targets increases, the number of required ports also increases by three, which hinders miniaturization.

[0014]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is characterized in that it is a computer to which a device such as an HDD can be attached and detached. Means for outputting a signal and outputting an inverted signal (inverted first signal) of the first signal when not mounted; an input / output port of the CPU which is set to a first state in response to the first signal; And a state holding means that is set to a second state in response to a reset signal from the CPU. The output terminal of the state holding means is connected to the CP signal together with the reset signal input terminal.
The output of the state holding means connected to the input / output port of U and indicating the second state and the reset signal are the same.

[0015]

FIG. 1 is a circuit diagram showing an embodiment of the present invention. In FIG. 1, the same parts as those in FIG. 2 are denoted by the same reference numerals.

In FIG. 1, a CPU 2, an FF 3, a predetermined voltage supply means 10, and a first point connected to the ground of the HDD 4 via a connector 5 from a connection point 11 of the means 10
The conductive path 12 and the second conductive path 13 connecting the connection point 11 and the input terminal of the inverting circuit 9 via the resistor R2 are the same as those in the conventional example shown in FIG.
U2, FF3 and inverting circuit 9 are connected.

Specifically, the output terminal of the inverting circuit 9 and the FF
3 is connected by a third conductive path 14, the output terminal of the FF3 is connected to the input / output port 15 of the CPU 2 by a fourth conductive path 16 via a resistor R1, and the reset terminal of the FF3 is connected to a fifth conductive path. Connected to the input / output port 15 via the path 17 and
The clock terminal CK and the input terminal D of F3 are both grounded.

Next, the operation of this embodiment will be described. First, when the HDD 4 is mounted on the connector 5, FIG.
As in the conventional example shown in FIG. 5, a high-level signal is output from the inverting circuit 9, and the input terminal D and the clock terminal CK of the FF3 are always grounded, so that the FF3 is set (output of the output terminal Q). Never goes to a high level). On the other hand, when the HDD 4 is removed from the connector 5, the output of the inverting circuit 9 becomes low level.
Is set.

As a result, during operation, the CPU 2 outputs a reset signal (low level signal) from the input / output port 15 to reset the FF 3 once, and then determines the output level of the output terminal Q of the FF 3, The attachment / detachment of the HDD 4 can be determined. That is, when the HDD 4 is mounted, F
Since a high-level signal is input to the set terminal of F3, a reset signal is output from the CPU 2, and the reset state of FF3 is maintained. On the other hand, HD
When D4 is not mounted, a low-level signal is input to the set terminal of FF3.
Even if the reset is performed by the reset signal from U2, the output of the output terminal Q is at a high level because the state is shifted to the set state by a low level signal input to the set terminal thereafter.

The input / output port 15 of the CPU 2 is
Since the conductive path 16 and the fifth conductive path 17 are connected to the output terminal Q and the reset terminal of the FF 3 respectively, the low-level signal output from the input / output port 15 goes not only to the reset terminal but also to the output terminal Q. It is possible,
Since the resistor R1 is interposed in the fourth conductive path 16, such sneaking can be avoided.

Next, when the CPU 2 is in the suspended state
The detection of replacement and removal of D4 will be described.

Even if the CPU 2 is suspended, the HD
Once D4 is removed, the output of inverting circuit 9 goes low, so that FF3 is set in response.

Therefore, if the FF 3 is reset immediately before the CPU 2 enters the suspend state, the H
Since the FF 3 is set in accordance with the replacement or removal of the DD 4, the CPU 2 can detect the attachment / detachment of the suspended HDD 4 by determining the input of the input / output port 15 at the end of the suspension.

In this embodiment, the removable device is an HD
D has been described as an example, but the present invention is not limited to this, and a port replicator, an expansion docking station, an FDD (Floppy Disk
ve). Further, in the present embodiment, the case where the number of detachable devices is one has been described. However, a plurality of such devices may be provided. In this case, an input / output port is provided for each device, and each port is provided in the present embodiment. What is necessary is just to connect the circuit which consists of FF3 etc. which were shown.

[0025]

According to the present invention, the attachment / detachment of a device such as an HDD can be detected by one port even during the suspension of the CPU, so that the size can be reduced as compared with the prior art.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Computer main body 2 CPU 3 FF 4 HDD 5 Connector 9 Inversion circuit 10 Predetermined voltage supply means 12 First conductive path 13 Second conductive path 14 Third conductive path 15 Input / output port 16 Fourth conductive path 17 Fifth conductive path

Claims (2)

(57) [Claims] 1. A computer to which a device such as an HDD can be attached and detached, comprising: a CPU; Output means, and state holding means set to a first state in response to the first signal and set to a second state in response to a reset signal from an input / output port of the CPU; An output terminal of the state holding means is connected to an input / output port of the CPU together with the reset signal input terminal, and an output of the state holding means indicating the second state and the reset signal are the same. Computer. 2. A computer to which a device such as an HDD can be attached and detached, comprising: a CPU; a flip-flop;
An inverting circuit, a first conductive path for guiding the output from the predetermined voltage supply means to the ground of the device when the device is mounted, one end connected to the first conductive path, and the other end connected to an input terminal of the inverting circuit. A third connection path that connects the connected second conductive path to the output terminal of the inverting circuit and the set terminal of the flip-flop;
A conductive path, an output terminal of the flip-flop and the CP
A computer comprising: a fourth conductive path connecting the input / output port of U via a limiting resistor; and a fifth conductive path connecting the reset terminal of the flip-flop to the input / output port of the CPU. .