HYB25D256400BT Datasheet, PDF (50/77 Pages) Infineon Technologies AG – 256-Mbit Double Data Rate SDRAM, Die Rev. B

HYB25D256[400/800/160]B[T/C](L)
256-Mbit Double Data Rate SDRAM, Die Rev. B
Simplified State Diagram
Power
Applied
Power
On
Precharge
PREALL
MRS
EMRS
MRS
REFS
Self
Refresh
REFSX
Idle
REFA
Auto
Refresh
CKEH
CKEL
Active
Power
Down
ACT
CKEH
CKEL
Precharge
Power
Down
Write
Row
Active
Read
Burst Stop
Write
Write A
Read A
Read
Read
Write A
Write
A
PRE
PRE
Read
A
PRE
Read A
Read
A
PRE
Precharge
PREALL
Automatic Sequence
Command Sequence
PREALL = Precharge All Banks
MRS = Mode Register Set
EMRS = Extended Mode Register Set
REFS = Enter Self Refresh
REFSX = Exit Self Refresh
REFA = Auto Refresh
CKEL = Enter Power Down
CKEH = Exit Power Down
ACT = Active
Write A = Write with Autoprecharge
Read A = Read with Autoprecharge
PRE = Precharge
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2003-01-09, V1.1