Clock switching device and clock switching method
AssigneeNEC Corporation
InventorNaoki Kobayashi
Life of this patent
Estimating the term…
Abstract
A clock switching device capable of automatic switching to a clock distribution system for back-up without interrupting processing of the device, which includes an abnormality detection unit which detects lack of coincidence in a logical level between a current clock pulse and a one-cycle preceding clock pulse as abnormality in a waveform on the basis of a plurality of cock pulses, a phase adjustment unit for switching which adjusts a phase of other clock pulse to a phase of a clock pulse being output, and a switching unit which switches to and outputs other clock pulse whose phase is adjusted by the phase adjustment unit for switching based on detection of lack of coincidence in a logical level by said abnormality detection unit.
Claims15
A clock switching device which switches a clock to be supplied to an information processing device, comprising:
- a unit which detects, out of a plurality of clock pulses applied, abnormality in a waveform of said clock pulse being output, and
- a unit which, when said abnormality in a waveform is detected, switches to and outputs other clock pulse whose phase is matched with a phase of said clock pulse being output.
A clock switching method of switching a clock to be supplied to an information processing device, comprising the step of:
- detecting, out of a plurality of clock pulses applied, abnormality in a waveform of said clock pulse being output, and switching to and outputting other clock pulse whose phase is matched with a phase of said clock pulse being output.
An information processing device having a clock switching device which switches a clock to be supplied, wherein
- said clock switching device includes
- a unit which detects, out of a plurality of clock pulses applied, abnormality in a waveform of said clock pulse being output, and
- a unit which, when said abnormality in a waveform is detected, switches to and outputs other clock pulse whose phase is matched with a phase of said clock pulse being output.
Dependencies are inferred from the claim text.