K4S56323LF - F(H)E/N/S/C/L/R

May 2004

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. In order to save power consumption, Mobile-DRAM includes the internal temperature sonsor and control units to control the self

refresh cycle automatically according to the two temperature range : Max 40

°C and Max 85 °C(for Extended), Max 70 °C(for

Commercial).

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

Temperature Range

Self Refresh Current (Icc6)

Unit

- E/C

- N/L

- S/R

Full Array

1/2 of Full Array

1/4 of Full Array

Max 85/70

°C

1500

600

600

450

400

uA

Max 40

°C

450

400

350

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

Temperature Compensated Self Refresh

B. POWER UP SEQUENCE

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 PASR operating type of the device after normal MRS.

EMRS cycle is not mandatory and the EMRS command needs to be issued only when PASR is used.

The default state without EMRS command issued is all full array refreshed.

The device is now ready for the operation selected by EMRS.

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

In order to adjust another mode in the state of 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.

- Full Array

- 1/2 Array

- 1/4 Array