K4M511633C - R(B)N/G/L/F

March 2006

11

Mobile SDRAM

1. In order to save power consumption, Mobile SDRAM has PASR option.

2. Mobile SDRAM supports 3 kinds of PASR in self refresh mode : Full Array, 1/2 of Full Array and 1/4 of Full Array.

BA1=0

Partial Self Refresh Area

1. Apply power and attempt to maintain CKE at a high state and all other inputs may be undefined.

- Apply VDD before or at the same time as VDDQ.

2. Maintain stable power, stable clock and NOP input condition for a minimum of 200us.

3. Issue precharge commands for all banks of the devices.

4. Issue 2 or more auto-refresh commands.

5. Issue a mode register set command to initialize the mode register.

6. Issue a extended mode register set command to define DS or PASR operating type of the device after normal MRS.

For operating with DS or PASR , set DS or PASR mode in EMRS setting stage.

In order to adjust another mode in the state of DS or PASR mode, additional EMRS set is required but power up sequence is not

needed again at this time. In that case, all banks have to be in idle state prior to adjusting EMRS set.

BA0=0

BA1=0

BA0=0

BA1=0

BA0=1

BA1=1

BA0=1

BA1=1

BA0=0

BA1=1

BA0=1

BA1=1

BA0=0

BA1=0

BA0=1

BA1=0

BA0=0

BA1=0

BA0=1

BA1=1

BA0=1

BA1=1

BA0=0

Partial Array Self Refresh

B. POWER UP SEQUENCE

- Full Array

- 1/2 Array

- 1/4 Array

Internal Temperature Compensated Self Refresh (TCSR)

1. In order to save power consumption, Mobile-SDRAM includes the internal temperature sensor and control units to control the

self refresh cycle automatically according to the two temperature range ; 45

°C and 85 °C(for Extended), 70 °C(for Commercial).

2. If the EMRS for external TCSR is issued by the controller, this EMRS code for TCSR is ignored.

3. It has +/-5

°C tolerance.

Temperature Range

Self Refresh Current (Icc6)

Unit

-N/L

-G/F

Full Array

1/2 of Full Array

1/4 of Full Array

85/70

°C

800

800

700

625

uA

45

500

450

425