Back to results
US 7,078,945 B2Granted
Semiconductor device having logic circuit and macro circuit
AssigneeFujitsu Limited
InventorsYasushige Ogawa, Yoshiyuki Ishida
Life of this patent
Estimating the term…
Abstract
A semiconductor device includes both a logic circuit and a macro circuit. The macro circuit includes a circuit that consumes direct current (DC). In order to conserve power and allow for testing, the consumption of DC by the current consumption circuit can be stopped with a stop signal, which stops the operation of the macro circuit. The macro circuit can be restarted or returned to normal operation mode without risk of error caused by the stopping of the macro circuit.
Claims1
A semiconductor device, comprising:
- a macro circuit connected to an external power supply, including a direct current consumption circuit that consumes direct current in a normal mode in response to a start signal;
- a start signal generation circuit for generating the start signal in response to a stop signal that is in a deactivated state;
- and
- a reset circuit connected to the start signal generation circuit, the reset circuit including a power-on reset circuit and a composite circuit, wherein the power-on reset circuit generates a power-on reset signal and the composite circuit generates a composite reset signal by logically combining the power-on reset signal and the start signal and provides the composite reset signal to the direct current consumption circuit to change the state of the direct current consumption circuit to a reset mode when at least one of the power-on reset signal and the start signal is set to a first predetermined level, and wherein the state of the direct current consumption circuit is changed from the reset mode to the normal mode when both the power-on reset signal and the start signal are set to a second predetermined level.
1 more element
Dependencies are inferred from the claim text.