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US 8,410,833 B2Granted
On-chip power-up control circuit
AssigneeAdvanced Micro Devices, Inc.
InventorsMichael A. Nix, Golam R. Chowdhury, Curtis M. Brody, Faisal A. Syed
Life of this patent
Estimating the term…
Abstract
A power-up control circuit utilizes on-chip circuits, multiple voltages, a ring oscillator and counter, and edge and level detection circuits to guarantee reset during power-up conditions and continues the reset state with a variable length counter to guarantee a predictable reset. In addition, a clean start-up after a logical power-down condition is provided.
Claims19
A power-up control circuit comprising:
- a voltage detect circuit coupled to a first power supply, the voltage detect circuit to provide a detect signal indicating a ramp of the first power supply;
- a delay circuit coupled to the voltage detect circuit to provide a delayed detect signal that is a delayed version of the detect signal, the delay circuit coupled to a second power supply voltage;
- a ring oscillator circuit;
- and
- a counter circuit coupled to the ring oscillator circuit and the delay circuit to provide a reset signal that is released on reaching a specified count value.
2 more elements
A method comprising:
- providing a detect signal responsive to ramp of a first power supply voltage;
- delaying the detect signal in a delay circuit and supplying a delayed detect signal;
- latching the delayed detect signal in a latch circuit;
- enabling a counter circuit to count based on an output of the latch circuit;
- providing from the counter circuit an asserted reset signal;
- and
- counting in the counter circuit for a count value and thereafter deasserting the reset signal on reaching the count value.
4 more elements
A non-transitory tangible computer-readable medium encoding a representation of an integrated circuit that comprises:
- a voltage detect circuit coupled to a first power supply, the voltage detect circuit to provide a detect signal indicative of a ramp of the first power supply;
- a delay circuit coupled to the voltage detect circuit to provide a delayed detect signal that is a delayed version of the detect circuit, the delay circuit coupled to a second power supply voltage;
- a ring oscillator circuit;
- and
- a counter circuit coupled to the ring oscillator circuit and the delay circuit to provide a reset signal that is released upon counting a count value.
2 more elements
Dependencies are inferred from the claim text.