Digital circuit device and voltage drop detector circuitry
AssigneeRealtek Semiconductor Corp.
InventorChi-Fu Chang
Life of this patent
Estimating the term…
Abstract
A digital circuit device includes a power supply circuitry, a digital circuitry, a digital circuitry, and a protection circuitry. The power supply circuitry is configured to output a supply voltage. The digital circuitry is configured to be driven by the supply voltage, and is configured to perform at least one operation according to a first clock signal. The protection circuitry is configured to generate the first clock signal according to at least one of a voltage drop of the supply voltage and a load signal sent from the digital circuitry.
Claims15
A digital circuit device, comprising:
- a power supply circuitry configured to output a supply voltage;
- a digital circuitry configured to be driven by the supply voltage, and configured to perform at least one operation according to a first clock signal;
- and
- a protection circuitry configured to generate the first clock signal according to at least one of a voltage drop of the supply voltage and a load signal sent from the digital circuitry,
- wherein the protection circuitry comprises:
- a voltage drop detector circuit configured to detect the voltage drop and to generate a plurality of flag signals and an update signal according to an enable signal and a second clock signal;
- and
- a clock masking circuit configured to adjust the second clock signal according to the plurality of flag signals and the update signal, in order to generate the first clock signal.
A voltage drop detector circuit, comprising:
- a first flip flop circuit configured to output an enable signal to be a testing signal according to a clock signal;
- a plurality of first delay circuits configured to be driven by a supply voltage and to delay the testing signal to generate a plurality of flag signals, wherein the plurality of flag signals are read in response to an update signal to indicate a voltage drop of the supply voltage;
- a plurality of second delay circuits configured to be driven by the supply voltage and to delay the testing signal, in order to generate a first signal;
- a logic gate circuit configured to generate a second signal according to the first signal and a control signal;
- and
- a second flip flop circuit configured to output the second signal to be the update signal according to the clock signal.
A digital circuit device, comprising:
- a power supply circuitry configured to output a supply voltage;
- a digital circuitry configured to be driven by the supply voltage, and configured to perform at least one operation according to a first clock signal;
- and
- a protection circuitry configured to generate the first clock signal according to at least one of a voltage drop of the supply voltage and a load signal sent from the digital circuitry,
- wherein the protection circuitry comprises:
- a frequency adjustment circuit configured to determine a control ratio according to the load signal, wherein the frequency adjustment circuit is configured to increase the control ratio to a predetermined maximum value according to the load signal, or to decrease the control ratio to a predetermined minimum value according to the load signal;
- and
- a frequency divider circuit configured to generate the first clock signal according to the control ratio and a second clock signal.
Dependencies are inferred from the claim text.