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W631GG6KB
8.17.2 Power-Down clarifications - Case 1
When CKE is registered low for power-down entry, t PD (min) must be satisfied before CKE can be
registered high for power-down exit. The minimum value of parameter t PD (min) is equal to the
minimum value of parameter t CKE (min) as shown in section 10.16 “ AC Characteristics ” on page 138.
A detailed example of Case 1 is shown in Figure 69.
T0
T1
T2
Ta0
Ta1
Tb0
Tb1
Tb2
CK#
CK
Command
VALID
NOP
NOP
NOP
NOP
NOP
VALID
t PD
CKE
Address
t IH
VALID
t IS
t CPDED
t IH
t IS
t CKE
t IS
t CPDED
Enter
Power-Down
Mode
Exit
Power-Down
Mode
Enter
Power-Down
Mode
TIME BREAK
DON'T CARE
Figure 69 – Power-Down Entry/Exit Clarifications - Case 1
8.17.3 Power-Down clarifications - Case 2
For certain CKE intensive operations, for example, repeated ?PD Exit - Refresh - PD Entry‘ sequences,
the number of clock cycles between PD Exit and PD Entry may be insufficient to keep the DLL
updated. Therefore, the following conditions must be met in addition to t CKE in order to maintain
proper DRAM operation when the Refresh command is issued between PD Exit and PD Entry. Power-
down mode can be used in conjunction with the Refresh command if the following conditions are met:
1) t XP must be satisfied before issuing the command.
2) t XPDLL must be satisfied (referenced to the registration of PD Exit) before the next power-down can
be entered. A detailed example of Case 2 is shown in Figure 70.
T0
T1
T2
Ta0
Ta1
Tb0
Tb1
Tc0
Tc1
Td0
CK#
CK
Command
VALID
NOP
NOP
NOP
NOP
NOP
REF
NOP
NOP
CKE
Address
t IH
VALID
t IS
t PD
t CPDED
t IH
t IS
t CKE
t XP
t XPDLL
Enter
Power-Down
Mode
Exit
Power-Down
Mode
TIME BREAK
Enter
Power-Down
Mode
DON'T CARE
Figure 70 – Power-Down Entry/Exit Clarifications - Case 2
Publication Release Date: Dec. 09, 2013
Revision A05
- 75 -
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