CMS3216LAH datasheet(42/46 Pages) FIDELIX

42 / 46 page

Rev0.2, Aug. 2006

CMS3216LAx-75Ex

Figure 29. Deep Power Down Mode Entry

Figure 30. Deep Power Down Mode Exit

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.

DEEP POWER DOWN MODE ENTRY

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

DEEP POWER DOWN MODE EXIT SEQUENCE

CLK

Command

NOP

Precharge

All Bank

NOP

Burst

Terminate

CKE

NOP

Precharge

If needed

Deep Power Down

Entry

tRP

CLK

Command

CKE

Deep Power Down

Exit

Active

Address

Bank a

Row

Key

200 us

Precharge

All Bank

A10

AREF

Precharge

All Bank

NOP

EMRS

MRS NOP

NOP

Normal

MRS

Extended

MRS

Row Active

A Bank

tRP

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