摘要:
An electronic circuit that comprises components that operate asynchronously of one another. An interface element has inputs coupled to a respective one of the components. The interface element supplies a logic output signal that is a logic function of signals at the inputs and dependent on the relative timing of the signals at the inputs. The electronic circuit is switched to a test mode, in which test input signals are applied to the electronic circuit from a test signal source. During test a difference is caused to occur between the time intervals after which the test signal source affects different ones of the signals at the inputs of the interface element. Preferably the test control circuit activates said difference in the test mode and not in the normal operating mode.
摘要:
Die Erfindung betrifft eine Schaltungsanordnung und ein Verfahren zur Erzeugung eines Dual-Rail-Ausgangssignals mit einer Signalverarbeitungsvorrichtung (12) mit in Anhängigkeit von einem Eingangssignal ansteuerbaren Schaltern sowie zwei Ausgängen (x, xq), wobei durch einen der Schalter (s, sq) der erste Ausgang (x) und durch den anderen Schalter (sq, s) der zweite Ausgange (xq) mit einem sich auf einem ersten Potential (0) befindlichen Fußpunkt (v) der Steuervorrichtung verbindbar sind. Die Signalverarbeitungsvorrichtung ist über eine Schaltvorrichtung (13) mit Ausgängen der Schaltungsanordnung zur Ausgabe eines Dual-Rail-Ausgangssignals verbunden. Dabei sind die Ausgänge (E1, E2) der Schaltvorrichtung (13) in Abhängigkeit von einem Steuersignal (7) jeweils mit einem oder beiden Eingängen (D1, D2) verbindbar sind. Zudem ist eine Potentialkontrollvorrichtung zur Festlegung der Potentiale der Ausgänge (F1, F2) der Schaltungsanordnung vorgesehen, wenn diese nicht über die Schaltvorrichtung (13) und die Signalverarbeitungsvorrichtung (12) mit dem Fußpunkt (v) der Signalverarbeitungsvorrichtung verbunden sind.
摘要:
An integrated circuit (100) has a circuit portion (102) that can be switched to a standby mode through an enable transistor (104), which is coupled between an internal power supply line (120) and an external power supply line (130). The enable transistor (104) is controlled by control circuitry via a control line (160). The control line (160) is coupled to the gates of a first transistor (152) and a further transistor (154) of a logic gate (150). The substrate of the further transistor (154) is coupled to a backbias generator (170). Consequently, when the enable transistor (104) is switched off, the further transistor (154) is enabled and applies a substantial backbias to the gate of the enable transistor (104), thus dramatically reducing the leakage current from the circuit portion (102) through the enable transistor (104).
摘要:
A circuit includes an input terminal (56), an output terminal (70) and a latch (50). The input terminal (56) receives an input signal. The latch is programmable with a value. The latch (50) communicates the input signal to the output terminal (70) in response to the circuit not being in a sleep mode and in response to the circuit being in the sleep mode, furnishes a second signal to the output terminal (70) indicative of the value.
摘要:
A circuit for performing a digital logic operation comprising a start/stop oscillator (1) is proposed. The start/stop oscillator (1) starts in response to a system clock signal and is stopped a predetermined period of time after the digital logic operation has been completed. The period during which pulses are supplied by the start/stop oscillator (1) is shorter than the period of the system clock.
摘要:
A technique for reducing leakage current in static CMOS devices by adding additional transistors in series between selected inverters and ground or power. NMOS and PMOS transistors are added to selected buffers comprised of two inverters in series. The PMOS transistor (124) is connected between the first inverter (112,114) and power (Vdd) and the NMOS transistor (126) is connected between the second inverter (128) and ground. The added transistors are controlled by a memory cell (130) to be on when the buffer is being used and off when the buffer is unused. Alternatively, no PMOS transistor is added and an existing PMOS transistor of the first inverter is manufactured to sit in a Vgg well. The same tech niques are employed with selected buffer pairs.
摘要:
A low power wired OR circuit of the present invention comprises a plurality of logic blocks for pulling a wired OR signal line low in response to certain conditions, a differential pair of lines, such as the wired OR signal line and a reference signal line, and a sensing device coupled to the reference signal line and the wired OR signal line to receive the wired OR signal and the reference signal respectively and to detect a difference between the two signals. Having a differential pair of lines is advantageous because it maintains noise immunity for small voltage swings on the wired OR signal line, thereby reducing power dissipation in the wired OR circuit. A common current source coupled to each logic block through a common return path allows the low power wired OR circuit to control a discharge rate at which the wired OR line discharges.