CMS4A16LAx–75Ex
DEEP POWER DOWN MODE ENTRY
The Deep Power Down Mode is entered by having burst termination command, while CKE is low. The Deep Power Down
Mode has to be maintained for a minimum of 100us.
The following diagram illustrates Deep Power Down mode entry.
CLK
CKE
tRP
Burst
Terminate
Precharge
All Bank
Command
NOP
NOP
NOP
Precharge
If needed
Deep Power Down
Entry
Figure 29. Deep Power Down Mode Entry
DEEP POWER DOWN MODE EXIT SEQUENCE
The Deep Power Down Mode is exited by asserting CKE high.
After the exit, the following sequence is needed to enter a new command
1. Maintain NOP input conditions for a minimum of 200us
2. Issue precharge commands for all banks of the device
3. Issue 8 or more auto refresh commands
4. Issue a mode register set command to initialize the mode register
5. Issue a extended mode register set command to initialize the extended mode register
The following timing diagram illustrates deep power down exit sequence
CLK
CKE
Precharge
Command
Active
NOP
NOP
NOP
AREF
MRS
Key
EMRS
Key
All Bank
Bank a
Row
Address
A10
tRP
200 us
Deep Power Down
Exit
Precharge
All Bank
Normal
MRS
Extended
MRS
Row Active
A Bank
Figure 30. Deep Power Down Mode Exit
42
Rev. 0.5, May. ‘07
FIDELIX [ FIDELIX ]
