6.3.1.2 Skew matching constraints

  1. The address and command groups must be skew matched with respect to CK signals within ±100 ps.
  2. The DQ, DM signals must be skew matched with respect to DQS within ±25 ps.
  3. The read DQ/DQS training will adjust DQS signal to optimal sampling point based on the board skew between DQ and DQS.