tDQSS

• tDQSS - DQS latching rising transitions to associated clock edges, as described on Table 41/42 of JESD79-2E

As described in above image, tDQSS = DQS_rise – CK_rise.

It can also be seen that, parameters, like WL, are related to CK.

Refer to case_2, DQ is valid before WL is satisfied.

tDQSS

原文：http://www.cnblogs.com/freshair_cnblog/p/7054903.html