RESET CONTROL APPARATUS AND OPTICAL DISC APPARATUS

Abstract

An reset control apparatus includes a first circuit which operates on the basis of a first power supply specification, a second circuit which operates on the basis of a second power supply specification, a first reset signal output unit which supplies to the first circuit a first reset signal for resetting the first circuit on the basis of a first reset specification, a second reset signal output unit which supplies to the second circuit a second reset signal for resetting the second circuit on the basis of a second reset specification, and a power voltage unit which supplies a predetermined voltage to the first reset signal output unit and the second reset signal output unit.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

FIG. 1 is a block diagram showing a reset circuit according to an embodiment of the present invention;

FIG. 2 is a graph showing a reset voltage and reset frequency band in the reset circuit shown in FIG. 1;

FIG. 3 is a block diagram showing an example of an electronic apparatus using the reset circuit shown in FIG. 1;

FIG. 4 is a block diagram showing an example of an optical disc apparatus using the reset circuit shown in FIG. 1; and

FIG. 5 is a block diagram showing an example of an electronic apparatus in a case where a plurality of outputs of reset units in the reset circuit shown in FIG. 1 are not wired-OR connected.

Claims

1. An reset control apparatus comprising: a first circuit block which operates on the basis of a first power supply specification;a second circuit block which operates on the basis of a second power supply specification that is different form the first power supply specification;a first reset signal output unit which supplies to the first circuit block a first reset signal for resetting the first circuit block on the basis of a first reset specification;a second reset signal output unit which supplies to the second circuit block a second reset signal for resetting the second circuit block on the basis of a second reset specification that is different from the first reset specification; anda power voltage unit which supplies a predetermined voltage to the first reset signal output unit and the second reset signal output unit.

2. An reset control apparatus according to claim 1, wherein the first reset signal output unit includes a first operational amplifier and a first integrating circuit, the first operational amplifier includes a first input terminal to which a first voltage converted with the predetermined voltage by the first integrating circuit is supplied, and a second input terminal to which a first threshold voltage is supplied, andthe first reset signal output unit supplies to the first circuit block the first reset signal when the first operational amplifier is detected that the voltage value of the first voltage is equal to the voltage value of the first threshold voltage or less.

3. An reset control apparatus according to claim 1, wherein the first reset signal output unit includes a first operational amplifier and a first integrating circuit, the first operational amplifier includes a first input terminal to which a first voltage converted with the predetermined voltage by the first integrating circuit is supplied, and a second input terminal to which a first threshold voltage is supplied, andthe first reset signal output unit supplies to the first circuit block the first reset signal when the first operational amplifier is detected that a noise frequency that is superimposed on the first voltage is equal to a first frequency or more.

4. An reset control apparatus according to claim 1, wherein the second reset signal output unit includes an second operational amplifier and a second integrating circuit, the second operational amplifier includes a first input terminal to which a second voltage converted with the predetermined voltage by the second integrating circuit is supplied, and a second input terminal to which a second threshold voltage is supplied, andthe second reset signal output unit supplies to the second circuit block the second reset signal when the second operational amplifier is detected that the voltage value of the second voltage value is equal to the voltage value of the second threshold voltage or less.

5. An reset control apparatus according to claim 1, wherein the second reset signal output unit includes an second operational amplifier and a second integrating circuit, the second operational amplifier includes a first input terminal to which a second voltage converted with the predetermined voltage by the second integrating circuit is supplied, and a second input terminal to which a second threshold voltage is supplied, andthe second reset signal output unit supplies to the second circuit block the second reset signal when the second operational amplifier is detected that a noise frequency that is superimposed on the second voltage is equal to a second frequency or more.

6. The reset control apparatus according to claim 1, wherein one of the first circuit block and the second circuit block is a digital circuit, and the other is an analog circuit.

7. The reset control apparatus according to claim 1, wherein an output of the first reset signal output unit and an output of the second reset signal output unit are wired-OR connected.

8. An optical disc apparatus comprising: a digital circuit block which operates on the basis of a first power supply specification and includes at least a CPU;an analog circuit block which operates on the basis of a second power supply specification and includes at least an optical pickup head;a first reset signal output unit which supplies to the digital circuit block a first reset signal for resetting the digital circuit block on the basis of a first reset specification; anda second reset signal output unit which supplies to the analog circuit block a second reset signal for resetting the analog circuit block on the basis of a second reset specification that is different from the first reset specification.