23

Rev 0.7

64Mb Low Power DDR SDRAM

Advanced

Power down

The device enters power down mode when CKE Low, and it exits when CKE High. Once the power down mode is initiated, all of the

receiver circuits except CK and CKE are gated off to reduce power consumption. The both bank should be in idle state prior to enter-

mode, refresh operations cannot be performed, therefore the device cannot remain in power down mode longer than the refresh

CK

CK

(NOP)

CKE

Active

Figure.18 Power down entry and exit timing

0

1

2

3

4

5

6

7

8

9

10

11

12

13

Precharge

Precharge

power

down

Entry

Precharge

power

down

Exit

Active

power

down

Entry

Active

power

down

Exit

READ

Command