Before revision: Digital Delay-Line based TDC circuit diagram of a tapped delay line Tapped delay line using chained D-latches each with delay and controlled by the stop signal, which freezes all latches so the start signal stops propagating.
After revision: Digital Delay-Line based TDC Tapped delay line using chained D-latches each with delay and controlled by the stop signal, which freezes all latches so the start signal stops propagating.