US Patent No. 9,337,996

DATA RECOVERY CIRCUIT


Patent No. 9,337,996
Issue Date May 10, 2016
Title Data Recovery Circuit
Inventorship Tomomasa Nakama, Yamanashi (JP)
Assignee FANUC CORPORATION, Yamanashi (JP)

Claim of US Patent No. 9,337,996

1. A data recovery circuit that samples serial data and recovers data, the data recovery circuit comprising:
an oversampling unit that samples serial data received through serial communication by using a clock having a frequency higher
than a communication rate of the serial data and outputs parallel data of n bits (here, n is an integer or two or more) and
another clock having a frequency that is 1/n of the frequency of the clock;

an edge detection unit that detects an edge position of the parallel data and outputs the detected edge position as edge data;
an edge position calculation unit that estimates a next edge position of the parallel data that is output by the oversampling
unit based on a phase control signal output by a phase comparison unit, outputs the estimated next edge position as edge estimated
position data, and outputs data acquired by shifting the edge estimated position data by a half phase as sampling position
data;

the phase comparison unit that compares the edge data output by the edge detection unit with the edge estimated position data
output by the edge position calculation unit and outputs the phase control signal; and

a data sampling unit that extracts data from the parallel data output by the oversampling unit by using information of the
sampling position data output by the edge position calculation unit and outputs the extracted data as recovery data together
with data enable representing validness of the recovery data.