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.

The read DQ/DQS training will adjust DQS signal to optimal sampling point based on the board skew between DQ and DQS.