k4h280438d Samsung Semiconductor, Inc., k4h280438d Datasheet - Page 12

• Manufacturer Part Number: k4h280438d
• Description: 128mb D-die X4/8 Ddr Sdram
• Manufacturer: Samsung Semiconductor, Inc.

128Mb D-die(x4/8) DDR SDRAM
3. Functional Description
3.1 Simplified State Diagram
POWER
APPLIED
REGISTER
MODE
SET
POWER
WRITEA
ON
POWER
DOWN
WRITEA
WRITEA
WRITE
CKE L
Figure 3. State diagram
WRITE
MRS
PRE
CKEH
WRITEA
PRE
- 12 -
CHARGE
ACTIVE
ROW
IDLE
ACT
PRE
PRE
READ
READA
READA
CKEH
PRE
REFS
BURST STOP
R E A D
REFA
CKEL
REFSX
READA
READ
REFRESH
POWER
DOWN
WRITEA : Write with autoprecharge
READA : Read with autoprecharge
READA
SELF
REV. 0.3 Jan.31. 2001
REFRESH
AUTO
Automatic Sequence
Command Sequence