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US 7,352,634 B2Granted
Nonvolatile latch circuit and system on chip with the same
AssigneeHynix Semiconductor Inc.
InventorsHee Bok Kang, Jin Hong Ahn
Life of this patent
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Abstract
A nonvolatile latch circuit and a system on a chip with the same feature detection of change of latch data in an active period to store new data in a latch without an additional data storage time. The nonvolatile latch circuit does not require an additional data storage period but detects change of latch data in the active period to store new data in a nonvolatile latch unit. When power is accidentally off, new data are constantly stored in the nonvolatile latch unit, thereby preventing data loss and improving an operating speed without a booting time for restoring data.
Claims10
A nonvolatile latch circuit comprising:
- a nonvolatile latch unit configured to amplify and store a voltage level of an input signal in a nonvolatile ferroelectric capacitor in response to storage control signals during an active period where a clock is activated;
- a latch transition detecting unit configured to detect transition of an output signal from the nonvolatile latch unit to output a latch transition detecting signal when the output signal from the nonvolatile latch unit is transitioned;
- and
- a latch control unit configured to store data in the nonvolatile latch unit and output the storage control signals for restoring the stored data in response to the latch transition detecting signal and a power-on reset signal.
1 more element
Dependencies are inferred from the claim text.