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1. (WO2013112701) CLOCK DATA RECOVERY WITH OUT-OF-LOCK DETECTION

Pub. No.:    WO/2013/112701    International Application No.:    PCT/US2013/022914
Publication Date: Fri Aug 02 01:59:59 CEST 2013 International Filing Date: Fri Jan 25 00:59:59 CET 2013
IPC: H04L 7/04
Applicants: TEXAS INSTRUMENTS INCORPORATED
TEXAS INSTRUMENTS JAPAN LIMITED
Inventors: MUKHERJEE, Tonmoy, S.
AUDE, Arlo, J.
Title: CLOCK DATA RECOVERY WITH OUT-OF-LOCK DETECTION
Abstract:
The disclosed clock-data recovery architecture includes out-of-lock (including false lock) detection. A clock-data recovery (CDR) circuit (100) for out-of-lock (including false lock) detection includes a phase/frequency detector (PFD) (101) for clock recovery and a data retimer (111) for recovering/retiming data. A received data signal is input to phase/frequency detector (101), which generates a recovered clock, and to retimer (111) which recovers and retimes data based on the recovered clock. Out-of-lock detection is accomplished by sampling retimed/recovered data with positive and negative edges of the received data. In example embodiments, an out-of-lock condition is determined either by detecting the occurrence of, or counting, missed edges corresponding to the failure of received data sampling to detect corresponding positive/negative edges of the retimed/recovered data.