ESMT
M13S128324A
Self Refresh
A self refresh command is defines by having CS , RAS , CAS and CKE held low with WE high at the rising edge of the
clock (CLK). Once the self refresh command is initiated, CKE must be held low to keep the device in self refresh mode. During
the self refresh operation, all inputs except CKE are ignored. The clock is internally disabled during self refresh operation to
reduce power consumption. The self refresh is exited by supplying stable clock input before returning CKE high, asserting
deselect or NOP command and then asserting CKE high for longer than tXSRD for locking of DLL.
C L K
C L K
Self
Refresh
Auto
Refresh
Rea d
C O M M A N D
CK E
t X S N R
t X S R
D
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 CLK,
CLK and CKE. For maximum power savings, the user has the option of disabling the DLL prior to entering power-down. In that
case, the DLL must be enabled after exiting power-down, and 200 clock cycles must occur before a READ command can be
issued. However, power-down duration is limited by the refresh requirements of the device, so in most applications, the
self-refresh mode is preferred over the DLL disable power-down mode. In the power-down, CKE LOW and a stable clock signal
must be maintained at the inputs of the DDR SDRAM, and all other input signals are “Don’t Care”. The power-down state is
synchronously exited when CKE is registered HIGH (along with a NOP or DESELECT command). A valid executable command
may be applied one clock cycle later.
C L K
C L K
tIS
tIS
CK E
VALID
NOP
C O M M A N D
NOP
VALID
No column
acess
in program
Enter power-down
mode
Exit power-down
mode
Elite Semiconductor Memory Technology Inc.
Publication Date : May. 2007
Revision : 1.8 27/49
ESMT [ ELITE SEMICONDUCTOR MEMORY TECHNOLOGY INC. ]
