K4H280438B-TCA0 Datasheet, PDF (13/53 Pages) Samsung semiconductor – 128Mb DDR SDRAM

128Mb DDR SDRAM
3. Functional Description
3.1 Simplified State Diagram
SELF
REFRESH
REFS
MODE
REGISTER
SET
MRS
IDLE
REFSX
REFA
AUTO
REFRESH
CKEL
POWER
DOWN
CKEH
ACT
CKEL
POWER
DOWN
CKEH
WRITE
ROW
ACTIVE
BURST STOP
READ
WWRRITITEEA
WRITEA READA
READ
READ
POWER
APPLIED
WRITEA
WRITEA
READA
PRE
PRE
PRE
READA
READA
POWER
ON
PRE
PRE
CHARGE
Figure 3. State diagram
Automatic Sequence
Command Sequence
WRITEA : Write with autoprecharge
READA : Read with autoprecharge
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REV. 1.0 November. 2. 2000