Multi-power source semiconductor device
AssigneeNEC Corporation
InventorMasahiro Nomura
Life of this patent
Estimating the term…
Abstract
In a multi-supply-voltage semiconductor device including multiple blocks 31, 32, each of which has independent clock circuit 41, 42, and operating with variable power supply 101, variable delay circuit 20 which changes the amount of delay in accordance with the voltage value of the variable power supply 101 is provided to a clock signal supplied to several blocks 32 from clock generator circuit 10. This can reduce clock skew between the blocks even when the power supply voltage of variable power supply 101 is changed.
Claims17
A multiple-supply-voltage semiconductor device comprising a plurality of blocks, any or all of which have an independent clock circuit, and operating with a plurality of power supply voltages, characterized in that:
- a variable delay circuit which provides an amount of delay changing in accordance with a power supply voltage is provided for any or all of clock signals each of which is provided from a clock generator circuit to each of the plurality of blocks.
A multi-supply-voltage semiconductor device comprising a plurality of blocks, any or all of which have an independent clock circuit, and operating with a plurality of power supply voltages, characterized in that:
- a voltage level detector circuit which detects the voltage level of the power supply voltage and outputs the detected voltage level as a voltage level detect signal is provided;
- and
- a variable delay circuit which changes an amount of delay in accordance with the voltage level detect signal is provided for any or all of clock signals each of which is provided from a clock generator circuit to each of the plurality of blocks.
A multi-supply-voltage semiconductor device comprising a plurality of blocks, any or all of which have an independent clock circuit, and operating with a plurality of power supply voltages, characterized in that:
- a phase synchronizing circuit for bringing the clock signals in the blocks into phase is provided for any or all of clock signals each of which is provided from a clock generator circuit to each of the plurality of blocks.
A multi-supply-voltage semiconductor device comprising a plurality of blocks, any or all of which have an independent clock circuit, and operating with a plurality of power supply voltages, characterized in that:
- a power supply control circuit which controls the power supply voltage in accordance with an operation mode signal indicating the current operation mode is provided;
- and
- a variable delay circuit which changes an amount of delay in accordance with the operation mode signal is provided for any or all of clock signals each of which is provided from a clock generator circuit to each of the plurality of blocks.
Dependencies are inferred from the claim text.