HYB39S256407FE Datasheet, PDF (13/27 Pages) Qimonda AG – 256-MBit Synchronous DRAM

Internet Data Sheet
HY[B/I]39S256[40/80/16][0/7]F[E/T/F](L)
256-MBit Synchronous DRAM
3
Functional Description
This chapter contains the functional description.
TABLE 5
Truth Table: Operation Command
Operation
Device State
CKE
n-1¹⁾²⁾
CKE
n¹⁾²⁾
DQM BA0
AP=
Addr. CS¹ RAS CAS¹ WE
1)2)
BA1¹⁾²⁾ A10^{1)2) 1)2)}
)2) 1)2)
)2)
1)2)
Bank Active
Idle³⁾
H
X
X
V
V
V
LL H H
Bank Precharge
Any
H
X
X
V
L
X
LL H L
Precharge All
Write
Write with Auto pre-
charge
Read
Read with Auto pre-
charge
Any
Active³⁾
Active³⁾
Active³⁾
Active³⁾
H
X
X
X
H
X
LL H L
H
X
X
V
L
V
LH L
L
H
X
X
V
H
V
LH L
L
H
X
X
V
L
V
LH L
H
H
X
X
V
H
V
LH L
H
Mode Register Set Idle
H
X
X
V
V
V
LL L
L
No Operation
Any
H
X
X
X
X
X
LH H H
Burst Stop
Active
H
X
X
X
X
X
LH H L
Device Deselect
Any
H
X
X
X
X
X
HX
X
X
Auto Refresh
Idle
H
H
X
X
X
X
LL L
H
Self Refresh Entry Idle
H
L
X
X
X
X
LL L
H
Self Refresh Exit
Idle (Self Refr.) L
H
X
X
X
X
HX
X
X
LH H X
Power Down/
Active or Idle
H
Clock Suspend Entry or Burst
L
X
X
X
X
HX
X
X
LH H H
Power Down/
Active or Idle
L
Clock Suspend Exit or Burst
H
X
X
X
X
HX
X
X
LH H H
Data Write/
Output Enable
Active
H
X
L
X
X
X
XX
X
X
Data Write/
Output Disable
Active
H
X
H
X
X
X
XX
X
X
1) V = Valid, x = Don’t Care, L = Low Level, H = High Level
2) CKEn signal is input level when commands are provided, CKEn-1 signal is input level one clock before the commands are provided.
3) This is the state of the banks designated by BA0, BA1 signals.
Rev. 1.42, 2007-09
13
03292006-TMTK-JFEU