EDD51323DBH-LS
Power-Down Mode and CKE Control
DDR Mobile RAM will be into power-down mode at the second CK rising edge after CKE to be low level with NOP or
DESL command at first CK rising edge after CKE signal to be low.
CK
/CK
CKE
Valid*1
Valid*1
NOP
NOP
Valid*2
Valid*2
NOP
Command
Address
Power-down mode
Notes: 1. Valid*1 can be either Activate command or Precharge command, When Valid*1 is Activate command,
power-down mode will be active power-down mode, while it will be precharge power down mode,
if Valid*1 will be Precharge command.
2. Valid*2 can be any command as long as all of specified AC parameters are satisfied.
Power-Down Entry and Exit
However, if the CKE has one clock cycle high and on clock cycle low just as below, even DDR Mobile RAM will not
enter power-down mode, this command flow does not hurt any data and can be done.
CK
/CK
CKE
Command
PRE
NOP
NOP
ACT
Note: Assume PRE and ACT command is closing and activating same bank.
CKE Control
Preliminary Data Sheet E1432E20 (Ver. 2.0)
25
ELPIDA [ ELPIDA MEMORY ]
