W631GG6KB-15 Datasheet, PDF (75/158 Pages) Winbond – Double Data Rate architecture: two data transfers per clock cycle

W631GG6KB
7.17.4 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 tRFC(min) from the Refresh command is satisfied. This means CKE can
not be registered low twice within a tRFC(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
CKE
Address
REF
tIH
NOP
NOP
tPD
tIS
NOP
tIH
tIS
NOP
NOP
tCKE
NOP
NOP
NOP
tCPDED
Enter
Power-Down
Mode
Exit
Power-Down
Mode
tXP
tRFC(min)
TIME BREAK
Figure 71 – Power-Down Entry/Exit Clarifications - Case 3
Enter
Power-Down
Mode
DON'T CARE
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Publication Release Date: Feb. 27, 2013
Revision A04