A master clock generates master clock pulses having a selected frequency. A data clock generates a first data clock pulse corresponding to the leading edge of each master clock pulse and a second data clock pulse corresponding to the trailing edge of each master clock pulse. The first and second data...http://www.google.de/patents/US5479646?utm_source=gb-gplus-sharePatent US5479646 - Method and apparatus for obtaining data from a data circuit utilizing alternating clock pulses to gate the data to the output
