Skew matching constraints

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