Patent ID: 7260145

Claim:
A method, comprising the steps of: setting a phase rotator in a first position; initializing a partial value associated to said set phase rotator position; sampling a high speed signal to generate a signal sample; shifting the signal sample by 1 bit to generate a shifted sample; XORing said sample and said shifted sample; ORing a result of said XORing step with said partial value associated to said set phase rotator position; replacing said partial value associated to said set phase rotator position with a result of said ORing step; repeating the last five steps of sampling, shifting, XORing, ORing and replacing during a predetermined time interval to thereby generate the partial value associated to said set phase rotator position; setting said phase rotator in a second position and repeating the last seven steps of initializing, sampling, shifting, XORing, ORing, replacing and repeating to thereby generate a partial value associated to said second phase rotator position; and combining said partial values associated to said first and second positions into a global value; and analyzing the global value to determine a quality of the high speed signal.