W631GG6KB-15 Datasheet, PDF (67/158 Pages) Winbond – Double Data Rate architecture: two data transfers per clock cycle

W631GG6KB
The use of Self-Refresh mode introduces the possibility that an internally timed refresh event can be
missed when CKE is raised for exit from Self-Refresh mode. Upon exit from Self-Refresh, the DDR3
SDRAM requires a minimum of one extra refresh command before it is put back into Self-Refresh
Mode.
T0
CK#
CK
CKE
ODT
ODTL
Command
NOP
T1
T2
Ta0
tIS tCPDED
tCKSRE
tCKESR
tIS
SRE
NOP
Tb0
Tc0
Tc1
Td0
Te0
Tf0
tCKSRX
VALID
VALID
VALID
SRX
NOP^*1
VALID^*2
VALID^*3
Address
tRP
Enter Self Refresh
VALID
tXS
tXSDLL
Exit Self Refresh
VALID
Notes:
1. Only NOP or DES command.
2. Valid commands not requiring a locked DLL.
3. Valid commands requiring a locked DLL.
Figure 58 – Self-Refresh Entry/Exit Timing
TIME BREAK
DON'T CARE
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Publication Release Date: Feb. 27, 2013
Revision A04