EMD56324P Emlsi Inc., EMD56324P Datasheet - Page 29

• Manufacturer Part Number: EMD56324P
• Description: 256m 8m X 32 Mobile Ddr Sdram
• Manufacturer: Emlsi Inc.

Command
POWER-DOWN
Power-down is entered when CKE is registered LOW. 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, including CK and
CKB. Exiting power-down requires the device to be at the same voltage as when it entered power-down and a stable
clock.
Note: The power-down duration is limited by the refresh requirements of the device.
While in power-down, CKE LOW must be maintained at the inputs of the Mobile DDR SDRAM, while all other input sig-
nals are Don’t Care. The power-down state is synchronously exited when CKE is registered HIGH (in conjunction with
a NOP or DESELECT command). NOPs or DESELECT commands must be maintained on the command bus until t
is satisfied.
Command
CKE = High
Write with Auto Precharge < Burst Length = 4 >
Power down
CKB
CK
DQ’s
DQS
CK
CKB
BANK A
ACTIVE
0
Precharge
NOP
1
NOP
Precharge
2
power
Entry
down
Auto Precharge
WRITE
3
NOP
Din 0 Din 1 Din 2 Din 3
4
NOP
29
5
NOP
6
Active
t
WR
NOP
256M: 8M x 32 Mobile DDR SDRAM
7
Active
power
down
Entry
NOP
Internal precharge start
Bank can be reactivated at
completion of t
8
t
DAL
NOP
EMD56324P
9
t
RP
RP
Preliminary
NOP
t
IS
10
Active
power
down
Exit
t
XP
Rev 0.0
NOP
Read
11
XP