摘要:
A semiconductor device includes a test target circuit; scan chains that enable scanning of the test target circuit; a first random number generation circuit that forms test patterns supplied to the scan chains; a second random number generation circuit that is provided separately from the first random number generation circuit; and a random number control circuit that uses the random numbers generated by the second random number generation circuit to change the random numbers generated by the first random number generation circuit. In a test of the semiconductor device, since a period of a clock of a scan chain does not need to be longer than that of a clock of a pattern generator, the number of clocks of the pattern generator needed for a test can be prevented from increasing. Accordingly, a test time can be prevented from increasing.
摘要:
A semiconductor integrated circuit test method which reduces the required data volume for testing and efficiently detects faults in a circuit to be tested, the method comprising means 110 to generate identical pattern sequences repeatedly and means 120 to control flipped bits in pattern sequences, in order to generate neighborhood pattern sequences and use the neighborhood patterns to test the circuit under test 130. The neighborhood patterns include, in whole or in part, such pattern sequences as ones without flipped bits, ones with all or some flipped bits in one pattern and ones with all or some flipped bits in consecutive patterns or patterns at regular intervals, the interval being equivalent to a given number of patterns. Because a test pattern generator is provided independently of the circuit to be tested, the problem of a prolonged design period can be eliminated, a loss in the operating speed of the circuit under test is minimized and a high fault coverage can be achieved with less hardware overhead and a smaller volume of test data.
摘要:
A speedometer form watercraft wherein a speed signal is derived from a water pressure signal which is transmitted to the indicator through a conduit so that long electrical lines are not required.
摘要:
A semiconductor device includes a test target circuit; scan chains that enable scanning of the test target circuit; a first random number generation circuit that forms test patterns supplied to the scan chains; a second random number generation circuit that is provided separately from the first random number generation circuit; and a random number control circuit that uses the random numbers generated by the second random number generation circuit to change the random numbers generated by the first random number generation circuit. In a test of the semiconductor device, since a period of a clock of a scan chain does not need to be longer than that of a clock of a pattern generator, the number of clocks of the pattern generator needed for a test can be prevented from increasing. Accordingly, a test time can be prevented from increasing.
摘要:
A plurality of conductive pads (2) are formed on a mounting surface of a mounting board. Conductive pads (11) are formed on a principal surface of a semiconductor chip (10) at positions corresponding to the conductive pads of the mounting board, when the principal surface faces toward the mounting board. A plurality of conductive nanotubes (12) extend from the conductive pads of one of the mounting board and the semiconductor chip. A press mechanism (3) presses the semiconductor chip against the mounting board and restricts a position of the semiconductor chip on the mounting surface to mount the semiconductor chip on the mounting board, in a state that tips of the conductive nanotubes are in contact with the corresponding conductive pads not formed with the conductive nanotubes.
摘要:
To provide a fuel cutoff control method for an engine including a secondary air introducing system, capable of preventing afterburning in an exhaust pipe at the time of fuel being cut off in a decelerating state of the engine. A fuel cutoff control method during deceleration of an engine including a secondary air introducing pipe connected to an exhaust pipe, and an air cut valve provided on the secondary air introducing pipe, the method comprising a determination step of determining under predetermined condition's whether or not the engine is in a decelerating state, wherein in the decelerating state, a greater amount of fuel than a normally required amount of fuel flow is supplied during a predetermined period of time after the start of deceleration, and then fuel is cut off after the predetermined period of time has elapsed.
摘要:
A vessel speed detecting device that incorporates an arrangement for providing a more accurate speed indication from a pressure transducer under the condition of abrupt vessel speed changes. The output signal from the pressure transducer is modified under these conditions to provide the more accurate speed indication signal. The abrupt vessel speed change is determined by comparing the output of the speed indicator with a previously memorized speed indication signal. The modified speed indication is obtained from a memory.
摘要:
A battery voltage condition indicator in which the battery voltage is periodically sampled and a warning indication is given if the battery voltage falls below a predetermined relatively high value for relatively short periods of time or a predetermined higher voltage value for longer periods of times. In addition, a warning signal is also given in the event an open circuit occurs.
摘要:
A watercraft speed sensor that drives a speed signal from water pressure generated by the movement of the watercraft through the water. Several embodiments of arrangements are disclosed for obtaining an ambient reference signal which is subtracted from the measured pressure signal in order to obtain a greater degree of accuracy for changes in atmospheric conditions.
摘要:
An improved running speed detecting device for a watercraft wherein the speed signal is derived from a water pressure signal. The water pressure signal is transmitted to a voltage signal at different amplification factors at different running speeds so as to provide a greater degree of accuracy throughput the watercraft speed ranges.