参数资料
型号: W948D2FBJX5E
厂商: Winbond Electronics
文件页数: 43/60页
文件大小: 0K
描述: IC LPDDR SDRAM 256MBIT 90VFBGA
标准包装: 240
格式 - 存储器: RAM
存储器类型: 移动 LPDDR SDRAM
存储容量: 256M(8Mx32)
速度: 200MHz
接口: 并联
电源电压: 1.7 V ~ 1.95 V
工作温度: -25°C ~ 85°C
封装/外壳: 90-TFBGA
供应商设备封装: 90-VFBGA(8x13)
包装: 托盘
W948D6FB / W948D2FB
256Mb Mobile LPDDR
7.11.3 Self Refresh Entry and Exit
CK
CK
t RP
> t RFC
t XSR
t RFC
CKE
Command
PRE
NOP
ARF
NOP
NOP
NOP
ARF
NOP
ACT
Address
Ba, A
Row n
A10(AP)
DQ
Pre All
High-z
Row n
Recommene
d
Enter
Self Refresh
Mode
Exit from
Self Refresh
Mode
Any Command
(Auto Refresh
)
=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 min imum power-down duration is
specified by t CKE . 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 t XP 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
t RP
t CKE
t XP
CKE
Command
PRE
NOP
NOP
NOP
NOP
NOP
Valid
Address
Valid
A10 (AP)
DQ
Pre All
High-z
Valid
Power Down
Exit from
Any Command
Entry
Precharge Power-Down mode shown; all banks are idle and t RP
is met when Power-down Entry command is issued
- 43 -
Power Down
= Don't Care
Publication Release Date : Oct, 15, 2012
Revision : A01-004
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