WO2005076022A1 - 半導体集積回路及びその半導体集積回路を含んだ半導体システム - Google Patents
半導体集積回路及びその半導体集積回路を含んだ半導体システム Download PDFInfo
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- WO2005076022A1 WO2005076022A1 PCT/JP2005/001805 JP2005001805W WO2005076022A1 WO 2005076022 A1 WO2005076022 A1 WO 2005076022A1 JP 2005001805 W JP2005001805 W JP 2005001805W WO 2005076022 A1 WO2005076022 A1 WO 2005076022A1
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- circuit
- logic
- semiconductor integrated
- signal
- integrated circuit
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/317—Testing of digital circuits
- G01R31/3181—Functional testing
- G01R31/319—Tester hardware, i.e. output processing circuits
Definitions
- the present invention relates to detecting a failure in a semiconductor integrated circuit, particularly, a logic circuit provided therein.
- Patent Document 1 As a method of detecting a failure of a semiconductor integrated circuit due to such aging or the like, there is a technique described in Patent Document 1 conventionally.
- a logic circuit having the same configuration as this logic circuit is provided as a mirror circuit separately from the logic circuit to be tested for failure built in the semiconductor integrated circuit, and the outputs of the two logic circuits are compared with each other. An error is determined if the output results are different.
- This failure detection method is called a mirror circuit method.
- Patent Document 1 JP-A-11 305991
- An object of the present invention is to solve the above-described problem.
- An object of the present invention is to provide a circuit for detecting a failure in a logic circuit provided in a semiconductor integrated circuit without using a mirror circuit and having a small circuit scale. Is to generate the criterion of
- a specific logic circuit to be subjected to a fault test is specified. If a failure inspection is performed only for a state, for example, a state where an important function is performed, it is almost sufficient to inspect a failure due to aging.Therefore, only a specific state of the important function etc.
- the logic circuit is generated on a small scale with a logic different from that of the logic circuit, and the output signal of the generated circuit is used as a criterion for detecting an abnormality in the output signal of the logic circuit to be inspected.
- the semiconductor integrated circuit according to the present invention includes a logic circuit that outputs at least a predetermined output signal, a logic circuit having a logic different from the logic of the logic circuit, and a circuit scale smaller than the logic circuit.
- a generating circuit for generating a criterion for the predetermined output signal; receiving a criterion generated by the generating circuit; detecting an abnormality of the predetermined output signal of the logical circuit power based on the criterion;
- a determination circuit for determining that the logic circuit has failed upon detection and outputting an error signal.
- the present invention is characterized in that, in the semiconductor integrated circuit, the generation circuit generates the criterion based on the same logic as a part of the logic of the logic circuit.
- the present invention is characterized in that, in the semiconductor integrated circuit, the generation circuit generates the determination criterion using logic completely different from the logic of the logic circuit.
- the generation circuit also generates a determination period signal that specifies a period in which an abnormality of a predetermined output signal from the logic circuit is to be detected, and the determination circuit includes: Only when the determination period signal is output, an abnormality of the predetermined output signal of the logic circuit power is detected based on a determination criterion of the generation circuit.
- the semiconductor integrated circuit when the judgment circuit power error signal is output, the error signal is received, and the error signal is generated by the generation circuit in place of a predetermined output signal from the logic circuit.
- a conversion circuit for externally outputting the determined criterion as the predetermined output signal.
- the present invention provides a semiconductor integrated circuit, comprising: a CPU that operates the logic circuit; and an error signal output from the determination circuit when the error signal is output. And a built-in circuit.
- a semiconductor system of the present invention includes the semiconductor integrated circuit and the semiconductor integrated circuit. And an interrupt circuit for stopping the operation of the CPU when an error signal is output from a determination circuit provided in the semiconductor integrated circuit. And
- the determination criterion of the predetermined output signal is determined by the generation circuit.
- the signal is generated and output, and the determination circuit detects an abnormality of the predetermined output signal based on the determination criterion, and an error signal is output when the abnormality is detected.
- the generation circuit is generated by a logic different from the logic of the logic circuit to be inspected, and is a small-scale circuit that generates only a criterion for a predetermined determination signal from the logic circuit to be inspected. Since it can be configured, it is possible to determine a failure of a logic circuit to be inspected without using a mirror circuit as in the related art without practically any trouble.
- the determination circuit detects the abnormality of the predetermined output signal from the inspection target logic circuit based on the determination criterion only in the determination period during which the generation circuit signal is also output in the determination period signal.
- the configuration of the generation circuit can be simplified and the generation circuit can be further simplified as compared with the case where a generation circuit having a complicated configuration that guarantees that the determination criterion is not necessarily generated in a period other than the determination period. Can be small.
- a failure detection caused by aging of a logic circuit to be inspected or the like is performed by a small-scale generation circuit that generates a determination criterion without using a mirror circuit. Therefore, it is possible to detect a failure due to aging of a logic circuit to be inspected with a minimum area increase and an increase in power.
- the configuration is such that the abnormality detection of the predetermined output signal of the logic circuit based on the criterion of the generation circuit is performed only in the determination period, so that the size of the generation circuit can be further reduced. It works.
- FIG. 1 is a block diagram showing a semiconductor integrated circuit according to a first embodiment of the present invention.
- FIG. 2 shows a bubble chart of a state machine of a logic circuit provided in the semiconductor integrated circuit.
- FIG. 3 is a diagram showing a specific configuration of the semiconductor integrated circuit.
- FIG. 4 is a diagram showing a specific example of a logic circuit provided in the semiconductor integrated circuit.
- FIG. 5 is a diagram illustrating a configuration of a generation circuit that generates a determination reference signal for the output signal of the logic circuit illustrated in FIG.
- FIG. 6 is a block diagram showing a semiconductor integrated circuit according to a second embodiment of the present invention.
- FIG. 7 is a diagram showing a specific configuration of a logic circuit provided in the semiconductor integrated circuit.
- FIG. 8 is a diagram showing a semiconductor system according to a third embodiment of the present invention.
- FIG. 9 is a diagram illustrating a semiconductor system according to a fourth embodiment of the present invention.
- FIG. 10 illustrates a semiconductor system according to a fifth embodiment of the present invention.
- FIG. 11 is a diagram illustrating a semiconductor system according to a sixth embodiment of the present invention.
- FIG. 12 is a diagram showing a semiconductor system according to a seventh embodiment of the present invention.
- FIG. 1 and 3 show block diagrams of a semiconductor integrated circuit according to the first embodiment of the present invention.
- a logic circuit 1 to be subjected to a failure test is provided inside a semiconductor integrated circuit 10. 1 and a generation circuit 12 for generating a judgment criterion used for judging a failure of the logic circuit 11 are arranged in parallel with the logic circuit 11.
- FIG. 2 shows a bubble chart of the state machine in the logic circuit 11. This state machine transitions to state STATE-C1 when the E signal is input in the IDLE state, and transitions to state STATE-D1 when the F signal is input.
- the G signal is input in the state STATE-C4, the state transits to the IDLE state.
- the G signal is input only for the state STATE_C4.
- the state machine P in the logic circuit 11 is a circuit that satisfies all the transitions of the bubble chart shown in FIG.
- the state machine Q in the generation circuit 12 is provided when the transition from the IDLE state, which is the left half of the bubble chart in FIG. 2, to the state STATE—C1—STATE—C4 is important for the function of the logic circuit 11, This is a circuit that satisfies only the left half of the transition. That is, the logic of the generation circuit 12 is different from the logic of the logic circuit 11 to be inspected, and has the same logic as a part of the logic of all the logic circuits 11.
- the generation circuit 12 of FIG. 3 includes a flip-flop circuit 12a and four 2-input AND circuits 12b.
- the AND circuit 12b receives four input signals E and HJ corresponding to the transition portion in the left half of the bubble chart shown in FIG.
- the flip-flop circuit 12a is set when the signal E is asserted, and is reset when the signal G is asserted.
- the output of the flip-flop circuit 12a is commonly input to the four AND circuits 12b.
- the outputs of the four AND circuits 12b and the signal G are input to the state machine Q.
- the flip-flop circuit 12a and the four AND circuits 12b After the input of the signal E, the input of the signal E and the signals H, I, and J to the state machine Q is allowed by the flip-flop circuit 12a and the four AND circuits 12b. After transitioning Q from the IDLE state to the STATE—C 1—STATE—C4 state, when the signal G is input, the input of the signals E and H—J to the state machine Q is inhibited, and the state machine Q is turned off. STATE—A configuration to transition from the C4 state to the IDLE state! Therefore, when the signal G is input, when the output signal (predetermined output signal) out is output from the logic circuit 11 in the IDLE state of the logic circuit 11 to be inspected when the signal G is input, the output signal The criterion S for is output.
- the flip-flop circuit 12a and the four AND circuits 12b are connected to the state when, for example, the input signal J is also a signal for performing any one of transitions in the right half of the bubble chart in FIG. This is to prevent a malfunction in which the criterion S is erroneously generated and output when the machine Q is not inputting the signal G (original output of the criterion S).
- the output signal out of the logic circuit 11 and the criterion S from the generation circuit 12 are input to the determination circuit 13.
- the decision circuit 13 has a two-input AND circuit 13a, a decision criterion S from the generation circuit 12 is provided on one input side of the AND circuit 13a, and the logic circuit is provided on the other input side.
- An inverted output signal obtained by inverting the output signal out of 11 is input, and the logical product of these two signals is output as a determination result.
- the AND circuit 13a outputs a logical value of 0 from the AND circuit 13a when the output signal out of the logical circuit 11 and the criterion S of the generating circuit 12 match, and on the other hand, when the two signals do not match. In this case, an error signal Er having a logical value of 1 is output from the AND circuit 13a, and a failure due to aging of the logic circuit 11 or the like is detected.
- the error signal Er from the judgment circuit 13 is sent to the conversion circuit 14 and the interruption circuit 15.
- the error signal Er of the determination circuit 13 is input to the selector circuit 14a.
- the selector circuit 14a selects and outputs the output signal out of the logic circuit 11 when the error signal Er is not asserted from the determination circuit 13 and the logic value is 0.
- the criterion S of the generation circuit 12 is selected and output instead of the output signal out of the logic circuit 11.
- the criterion S from the generation circuit 12 (the correct output signal out to be output by the logic circuit 11) ) Is output from the semiconductor integrated circuit 10 to the outside.
- the interrupt circuit 15 receives the error signal Er and sends a signal to the CPU 16 that controls the operation of the logic circuit 11.
- a signal for operating the interrupt routine for stopping the operation of the CPU 16 is output to the CPU 16.
- the CPU 6 receives the signal from the interrupt circuit 15 and stops its operation at the same time as the end of the interrupt routine. Therefore, a malfunction due to the failure of the logic circuit 11 is prevented.
- the generation circuit 12 that generates the determination criterion S is configured by the logic of the left half of all the logic of the logic circuit 11 in the bubble chart shown in FIG. As compared with the case where a mirror circuit having the same configuration as the logic circuit 11 is separately provided as described above, the failure due to aging of the logic circuit 11 to be inspected can be determined on a small scale without any practical problem. Is possible.
- the functions of the logic circuit are clearly classified into important functions and functions that are not so important, only the important functions are determined to be faulty due to aging, and the circuit is determined. Reduced scale.
- the present invention is not limited to the case where the function of the logic circuit can cut out only the important function clearly and separately from the others, for example, when the logic circuit realizes various series of functions. The same can be applied to a case where a failure is determined only for important functions included in those functions.
- an example in this case will be described.
- FIG. 4 shows a block diagram of the logic circuit 20 to be inspected.
- FIG. 5 is a block diagram of a generation circuit 21 that generates a determination criterion.
- the logic circuit 20 in FIG. 4 also includes an error detection circuit 20d, a B format detection circuit 20e, a C format detection circuit 20f, and an end detection circuit 20g.
- the four circuits 20d to 20g perform predetermined processing according to the input signal A, and output output signals E, Bout, Cout, and F, respectively.
- the error detection circuit 20d detects that the input signal A is in error and asserts the output signal E.
- the B format detection circuit 20e detects that the input signal A is in the B format and outputs the output signal Bout. Assert. Further, when the input signal A has a value of 4, bl010, the C format detection circuit 20f detects that the input signal is in the A signal format and asserts the output signal Cout. When the value of the input signal A is 'bl lll', the end detection circuit 20g detects the end and asserts the output signal F.
- the generation circuit 21 in FIG. 5 is configured by a circuit that extracts only an error detection circuit 21d and an end detection circuit 21g that perform important processing for the logic circuit 20 to realize its function.
- the error detection circuit 21d detects that the input signal A is in error and asserts the output signal E ', and the input signal A becomes 4'. If the value is bill 1, the end detection circuit 21g detects the end and asserts the output signal F ,. The generation circuit 21 does not output anything when the input signal A is other than the above two values.
- the output signal E from the error detection circuit 20d of the logic circuit 20 and the output signal E ′ from the error detection circuit 21d of the generation circuit 21 are determined to match by the determination circuit 13 in FIG.
- the output signal F from the end detection circuit 20g of the logic circuit 20 and the output signal F 'from the end detection circuit 21g of the generation circuit 21 are determined to be coincident by the judgment circuit 13, which may cause deterioration of the logic circuit 20 over time. The resulting failure is determined.
- the failure is determined only for the error detection circuit 20d and the end detection circuit 20g, which are important functions of the logic circuit 20, so that the circuit scale of the generation circuit 21 is effectively reduced. It is possible to do.
- the error detection circuit 20d of the logic circuit 20 and the error detection circuit 21d of the generation circuit 21 have the same logic, and are generated with the end detection circuit 20g of the logic circuit 20.
- the present invention also simply describes the input signal A, the output signal E ', and the output signal F
- the logic of the logic circuit 20 is completely different from the logic of the logic circuit 20 so that only the constraint that the relationship between the input signal A and the output signal E and the output signal F of the logic circuit 20 is the same. May be designed.
- FIG. 6 shows a block diagram of the semiconductor integrated circuit 40 in the present embodiment.
- the semiconductor integrated circuit 40 shown in the figure includes a logic circuit 41 to be inspected, a generation circuit 42 that generates a criterion S, and a determination circuit 43, as in the first embodiment.
- FIG. 7 shows a specific example of the internal configuration of the logic circuit 41 to be inspected.
- the logic circuit 41 shown in the figure is constituted by an 8-bit register circuit having eight l-bit flip-flop circuits 41a to 41h. Each of the flip-flop circuits 41a to 41h is reset by receiving a reset signal in common, and 8 bits are initialized to “8 ′ hOO” in which all 8 bits are 0 values.
- the logic circuit 41 is the 8-bit register circuit shown in FIG. 7, when the reset state of the register circuit is important, the generation circuit 42 shown in FIG. As the expected value S, the logic that outputs a fixed value of “8, hOOj” is completely different from the logic of the 8-bit register circuit in Fig. 7.
- the generation circuit 42 when the generation circuit 42 receives a reset signal as an input signal, the generation circuit 42 outputs the reset signal as a determination period signal T, or initializes the logic circuit 41 based on a plurality of input signals.
- a reset signal is generated and output as a determination period signal T.
- This reset signal (determination period signal) T is commonly input to the eight flip-flop circuits 41a to 41h of the logic circuit 41 as the reset signal shown in FIG. Therefore, the determination period signal (reset signal) T is a predetermined output signal out which is output when the logic circuit 41 in FIG. 7 is in a reset state, that is, ⁇ 8 ′ h00 '' in which all 8 bits are 0 values. Specify the period (specifically, reset state) in which the output signal abnormality should be detected.
- the determination circuit 43 includes an AND circuit 43a and an exclusive OR circuit 43b.
- the output signal out from the logic circuit 41 and the criterion (expected value) S from the generation circuit 42 are input to the exclusive OR circuit 43b, and the exclusive ORed output signal is Input to AND circuit 43a.
- the judgment period signal T output from the generation circuit 42 is further input to the AND circuit 43a.
- the output signal of the AND circuit 43a is output to the conversion circuit 44 and the interrupt circuit 45 as an output signal (error signal Er) of the judgment circuit 43.
- the determination period signal T is output as a signal having a logical value of 1, and this determination period signal T Since the signal is input to one input side of the D circuit 43a, the output of the AND circuit 43a depends on the input signal of the other input side, that is, the output signal of the exclusive OR circuit 43b. Therefore, when the output signal out of the logic circuit 41 matches the expected value S (“8′hOOj”), the output of the exclusive OR circuit 43b becomes a logical value 0, and the error signal Er from the determination circuit 43 is negated. On the other hand, when the output signal out of the logic circuit 41 does not match the expected value S, the output of the exclusive OR circuit 43b becomes a logical value 1, and the error signal Er is asserted from the determination circuit 43.
- the logical value of the determination period signal T is output as 0, so that the error signal Er output from the AND circuit 43a of the determination circuit 43 is exclusive.
- the logic value always becomes 0 regardless of the output logic value of the OR circuit 43b, and the state is negated.
- the present embodiment it is possible to output the error signal Er from the determination circuit 43 only in the reset state in which the determination period signal (reset signal) T has been output.
- the predetermined output signal out from the inspection target logic circuit 41 and the expected value S (“8, hOOj”) generated by the generation circuit 42 do not match, the error signal Er is asserted from the determination circuit 43, and the logic circuit 41 An abnormality of the output signal out is detected, and a failure due to aging of the semiconductor integrated circuit 40 is found.
- the generation circuit 42 is completely different from the logic of the logic circuit 41 shown in FIG. 7, and generates the determination criterion S with the logic of outputting a fixed value of “8 ′ h0 0”.
- the circuit scale is much smaller than that of the logic circuit 41.
- the generation circuit 42 sets the determination criterion S to a value other than the determination period. There is no need to add a complicated configuration that guarantees not to be generated during the period (non-reset state). Therefore, the configuration of the generation circuit 42 can be further simplified, and the size of the generation circuit 42 can be further reduced.
- the conversion circuit 44, the interrupt circuit 45, and the CPU 46 shown in FIG. 6 are the same as those in the configuration shown in FIG.
- the period during which the error signal Er from the determination circuit 43 can be output is limited by the determination period signal T.
- the present invention is not limited to this.
- the period of the generation operation of the criterion S in the generation circuit 42 may be further limited. In this case, the generation circuit 42 does not always operate, and operates only while the determination period signal T is being output, so that the power consumption is low.
- the generation circuit 42 when the reset state of the logic circuit 41 is an important function, the generation circuit 42 is configured with a logic that outputs a fixed value of “8 ′ h00”.
- the logic that outputs the output signal in the set state as a fixed value may be configured as the generation circuit 42.
- the generation circuits 12 and 42, the determination circuits 13 and 43, the conversion circuits 14 and 44, the interrupt circuits 15 and 45, and the CPUs 16 and 46 include the logic circuit 11 41 and 41 are provided in the same semiconductor integrated circuit.
- the present invention is also applicable to a semiconductor integrated circuit including a logic circuit and a semiconductor including a generation circuit and the like provided in another semiconductor integrated circuit. It goes without saying that a semiconductor system constituted by an integrated circuit is included.
- FIG. 8 shows an example in which the semiconductor system including the semiconductor integrated circuit of the first embodiment is used as a vehicle engine control system.
- an error signal Er is sent to a display unit to display the failure of the semiconductor integrated circuit 10.
- the engine speed is gradually reduced based on the speed information from the drive train, and brake control is performed to stop the vehicle safely.
- FIG. 9 shows an example in which a semiconductor system including the semiconductor integrated circuit of the first embodiment is used as a motor control system for a robot.
- This motor control system sends an error signal Er to a display unit to display a failure of the semiconductor integrated circuit 10 when a failure due to aging or the like of the logic circuit 11 in the semiconductor integrated circuit 10 is detected. At the same time, the robot can be stopped by stopping the operation of the motor.
- FIG. 10 shows a security management system for a semiconductor system including the semiconductor integrated circuit of the first embodiment. An example when used as a stem is shown.
- This crime prevention management system when a failure due to aging or the like of the logic circuit 11 in the semiconductor integrated circuit 10 provided in a home security device is detected, an error signal Er is displayed on a display unit provided in the security device. To indicate the failure of the security device incorporating the semiconductor integrated circuit 10, and also to notify the failure of the security device by sending an error signal Er to the failure receiving unit of the security management system.
- FIG. 11 shows an example in which a semiconductor system including the semiconductor integrated circuit of the first embodiment is used as an ATM management system.
- an error signal Er is sent to a display unit in the ATM to display the failure of the semiconductor integrated circuit 10 and to manage the ATM. Then, an error signal Er is also sent to the failure receiving section of the management system in the bank to notify that the ATM has failed.
- FIG. 12 shows an example in which a semiconductor system including the semiconductor integrated circuit of the first embodiment is used as a home network system.
- home appliances such as telephones, televisions, DVDs, and personal computers are each equipped with a home network system N including a semiconductor integrated circuit 10 (in FIG. 1, a home in a telephone is shown). Show only network system N! /, RU).
- These home network systems are controlled by a home network control system C.
- the home network control system C is notified that the telephone has failed, and the home network control system C receiving the notification notifies the home network control system C of the failure.
- the display indicates that the telephone is out of order and disables control of using the telephone. In this case, if the control does not use the telephone, the execution is possible.
- the semiconductor integrated circuit included in the semiconductor system is the semiconductor integrated circuit 10 shown in FIG. 1 or FIG. 3, but the semiconductor integrated circuit 4 shown in FIG. Of course, it can be set to 0. Industrial applicability
- the present invention failure detection due to aged deterioration of a logic circuit to be inspected can be performed by a small-scale generation circuit that generates a determination criterion without using a mirror circuit. Therefore, the present invention is useful as a semiconductor integrated circuit that detects a failure due to aging of a built-in logic circuit with a small increase in area and low power consumption.
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- Semiconductor Integrated Circuits (AREA)
- Test And Diagnosis Of Digital Computers (AREA)
Abstract
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US10/549,118 US7343547B2 (en) | 2004-02-09 | 2005-02-08 | Semiconductor integrated circuit, and semiconductor system including that semiconductor integrated circuit |
JP2005517779A JP4754355B2 (ja) | 2004-02-09 | 2005-02-08 | 半導体集積回路及びその半導体集積回路を含んだ半導体システム |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004-031746 | 2004-02-09 | ||
JP2004031746 | 2004-02-09 |
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WO2005076022A1 true WO2005076022A1 (ja) | 2005-08-18 |
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PCT/JP2005/001805 WO2005076022A1 (ja) | 2004-02-09 | 2005-02-08 | 半導体集積回路及びその半導体集積回路を含んだ半導体システム |
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US (1) | US7343547B2 (ja) |
JP (1) | JP4754355B2 (ja) |
WO (1) | WO2005076022A1 (ja) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60231186A (ja) * | 1984-05-01 | 1985-11-16 | Nippon Telegr & Teleph Corp <Ntt> | 自己テスト回路 |
JPH07239370A (ja) * | 1994-02-28 | 1995-09-12 | Nec Kyushu Ltd | 半導体集積回路 |
JP2001343427A (ja) * | 2000-06-01 | 2001-12-14 | Mitsubishi Electric Corp | テスト装置およびテスト方法 |
JP2004021833A (ja) * | 2002-06-19 | 2004-01-22 | Renesas Technology Corp | 自己テスト機能内蔵半導体集積回路およびそれを備えたシステム |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW334532B (en) * | 1996-07-05 | 1998-06-21 | Matsushita Electric Ind Co Ltd | The inspection system of semiconductor IC and the method of generation |
JPH11305991A (ja) | 1998-04-17 | 1999-11-05 | Toshiba Corp | マイクロコンピュータ |
JP2003330549A (ja) * | 2002-05-10 | 2003-11-21 | Hitachi Ltd | 半導体集積回路、電源回路及び情報記録媒体 |
-
2005
- 2005-02-08 JP JP2005517779A patent/JP4754355B2/ja not_active Expired - Fee Related
- 2005-02-08 US US10/549,118 patent/US7343547B2/en active Active
- 2005-02-08 WO PCT/JP2005/001805 patent/WO2005076022A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60231186A (ja) * | 1984-05-01 | 1985-11-16 | Nippon Telegr & Teleph Corp <Ntt> | 自己テスト回路 |
JPH07239370A (ja) * | 1994-02-28 | 1995-09-12 | Nec Kyushu Ltd | 半導体集積回路 |
JP2001343427A (ja) * | 2000-06-01 | 2001-12-14 | Mitsubishi Electric Corp | テスト装置およびテスト方法 |
JP2004021833A (ja) * | 2002-06-19 | 2004-01-22 | Renesas Technology Corp | 自己テスト機能内蔵半導体集積回路およびそれを備えたシステム |
Also Published As
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JP4754355B2 (ja) | 2011-08-24 |
JPWO2005076022A1 (ja) | 2007-10-11 |
US20060282721A1 (en) | 2006-12-14 |
US7343547B2 (en) | 2008-03-11 |
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