W948D6FBHX5E-TR Datasheet, PDF (43/60 Pages) Winbond – 256Mb Mobile LPDDR

W948D6FB / W948D2FB
7.11.3 Self Refresh Entry and Exit
CK
CK
t_RP
CKE
Command _PRE
NOP
ARF
Address
A10(AP)
DQ
Pre All
High-z
256Mb Mobile LPDDR
> t _RFC
t_XSR
t _RFC
NOP
NOP
NOP
ARF
NOP
ACT
Ba, A
Row n
Row n
Enter
Self Refresh
Mode
Exit from
Self Refresh
Mode
Any Command
(RAeuctoomRdmeferenseh)
=Don't Care
7.12 Power Down
Power-down is entered when CKE is registered Low (no accesses can be in progress). If power-down occurs when
all banks are idle, this mode is referred to as precharge power-down; if power-down occurs when there is a row
active in any bank, this mode is referred to as active power-down.
Entering power-down deactivates the input and output buffers, excluding CK, CK and CKE. In power-down mode,
CKE Low must be maintained, and all other input signals are “Don‟t Care”. The minimum power-down duration is
specified by tCKE. However, power-down duration is limited by the refresh requirements of the device.
The power-down state is synchronously exited when CKE is registered High (along with a NOP or DESELECT
command). A valid command may be applied tXP after exit from power-down.
For Clock Stop during Power-Down mode, please refer to the Clock Stop subsection in this specification.
7.12.1 Power-Down Entry and Exit
CK
CK
tRP
tCKE
tXP
CKE
Command PRE
NOP
NOP
NOP
NOP
NOP
Valid
Address
Valid
A10 (AP)
DQ
Pre All
High-z
Power Down
Entry
Precharge Power-Down mode shown; all banks are idle and tRP
is met when Power-down Entry command is issued
Exit from
Power Down
Valid
Any Command
= Don't Care
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Publication Release Date : Oct, 15, 2012
Revision : A01-004