A sample signal is sequentially transported through a plurality of serial shift registers in respective data channels. The sample signal varies between a pair of levels, namely a first level and a second level, to resemble a step with respect to time. The shift registers are monitored by a skew detection...http://www.google.es/patents/US6079035?utm_source=gb-gplus-sharePatente US6079035 - Parallel data skew detecting circuit
CHlShiftRegister31aOut CHlShiftRegister31bOut C H1Shi ftRegi ster31cOut C H1Shi ftRegi ster31dOut CHlShiftRegister31eOut CHI EXOR 34a Out CHI EXOR 34b Out CHI EXOR 34c Out CHI EXOR 34d Out CHI EXOR 34 e Out CHI Gate 35a Out CHI Gate 35b Out CHI Gate 35c Out
CHI Gate 35d Out CHI Gate 35e Out CHI OR 36 Out
CH2ShiftRegister31aOut CH2 Shi ftRegi ster3lbOut CH2 EXOR 34a Out _ CH2 EXOR 34b Out _ CH2 Gate 35a Out _ CH2 Gate 35b Out CH2 OR 36 Out