Semiconductor integrated circuit device
View Patent ↗A semiconductor integrated circuit device for fast and low power operations, comprising a plurality of circuit blocks of a chip, each of which has a plurality of states with different power consumption values. A power management circuit determines the state of each of the circuit blocks so as not to exceed a maximum power consumption value of the semiconductor integrated circuit device by considering the power consumption of each circuit block and by each state transition in each circuit block. The maximum power consumption value may be preset or adjustable after fabrication.
1. A semiconductor integrated circuit device comprising:
a power control circuit; and
a plurality of first circuits, each of the plurality of first circuits having at least a first state (active) and a second state (standby);
wherein a power consumption of the first circuit in the first state is higher than the power consumption of the first circuit in the second state, and
wherein the power control circuit controls a state of each of the plurality of first circuits, based on the power consumption of the plurality of the first circuits.
2. The semiconductor integrated circuit device according to claim 1 , further comprising:
a second circuit to be privileged to access each of the first circuits;
wherein one of the first circuit is controlled to be in the second state, even when the second circuit has necessity to access the one of the first circuit.
3. The semiconductor integrated circuit device according to claim 1 ,
wherein the second circuit issues a request to the power control circuit and access the one of the first circuit when the power control circuit allow the second circuit to access the one of the first circuits.
4. The semiconductor integrated circuit device according to claim 1 , wherein, when the first circuit is in the second state, no clock is supplied to the first circuit.
5. The semiconductor integrated circuit device according to claim 1 , wherein, when the first circuit is in the second state, no supply voltage is supplied to the first circuit.
6. The semiconductor integrated circuit device according to claim 1 , wherein, when the first circuit is in the second state, leakage current is suppressed.