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W631GG6KB
8.17.4 Power-Down clarifications - Case 3
If an early PD Entry is issued after a Refresh command, once PD Exit is issued, NOP or DES with
CKE High must be issued until t RFC (min) from the Refresh command is satisfied. This means CKE can
not be registered low twice within a t RFC (min) window. A detailed example of Case 3 is shown in
Figure 71.
T0
T1
T2
Ta0
Ta1
Tb0
Tb1
Tc0
Tc1
Td0
CK#
CK
Command
REF
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
CKE
t IH
t IS
t PD
t IH
t IS
t CKE
Address
t CPDED
t XP
t RFC(min)
Enter
Power-Down
Mode
Exit
Power-Down
Mode
TIME BREAK
Enter
Power-Down
Mode
DON'T CARE
Figure 71 – Power-Down Entry/Exit Clarifications - Case 3
Publication Release Date: Dec. 09, 2013
Revision A05
- 76 -
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