MREP training aligns the Read MDQS phase with the data buffer clock. In this training mode, the memory controller sends a sequence of read commands, the DRAM sends out the MDQS, the data buffer samples the strobe with the clock and feeds the result back on DQ. Calibration continues to perform this training to find the 0 to 1 transition on the Read MDQS sampled with the data buffer clock.
| XSDB Reg | Usage | Signal Description |
|---|---|---|
| BRAM_DB_MREP_MRD_LAT_RANK*_NIBBLE* | One value per rank per nibble | MRD latency [8:6] and MREP phase [5:0] |