The synchronizer is a one-bit wide and six-bit deep FIFO buffer that compensates for the phase difference between dpa_fast_clock—the optimal clock that the DPA block selects—and the fast_clock that the I/O PLLs produce. The synchronizer can only compensate for phase differences, not frequency differences, between the data and the receiver’s input reference clock.
An optional port, rx_fifo_reset, is available to the internal logic to reset the synchronizer. The synchronizer is automatically reset when the DPA first locks to the incoming data. Intel recommends that you use rx_fifo_reset to reset the synchronizer when the data checker indicates that the received data is corrupted.