access time的问题

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access time的问题 [复制链接]

型号是：EDD5116AGTA

DQ output access time from CK, /CK tAC –0.7 0.7 –0.7 0.7 ns 2, 11
DQS output access time from CK, /CK tDQSCK –0.55 0.55 –0.55 0.55 ns 2, 11
DQS to DQ skew tDQSQ — 0.4 — 0.4 ns 3

看到这个实在无法理解，下面是相关解释，想了解的是访问速度，是否可以理解为0.4ns呢？
请理解的朋友，解答一二，谢谢！
CK, /CK (input pins)
The CK and the /CK are the master clock inputs. All inputs except DM, DQS and DQs are referred to the cross point
of the CK rising edge and the /CK falling edge. When a read operation, DQS and DQs are referred to the cross point
of the CK and the /CK. When a write operation, DQS and DQs are referred to the cross point of the DQS and the
VREF level. DQS for write operation is referred to the cross point of the CK and the /CK. CK is the master clock
input to this pin. The other input signals are referred at CK rising edge.
DQ0 to DQ15 (input/output pins)
Data is input to and output from these pins (DQ0 to DQ7; EDD5108AGTA, DQ0 to DQ15; EDD5116AGTA).
DQS, LDQS and UDQS (input and output pins)
DQS provides the read data strobes (as output) and the write data strobes (as input). In ×16 products, LDQS is the
lower byte (DQ0 to DQ7) data strobe signal, UDQS is the upper byte (DQ8 to DQ15) data strobe signal.

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