EM658160 데이터 시트보기 (PDF) - Etron Technology
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EM658160 Datasheet PDF : 26 Pages
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Et r onT ec h
4Mx16 DDR SDRAM
EM658160
Operation Mode
Fully synchronous operations are performed to latch the commands at the positive edges of CK. Table 2
shows the truth table for the operation commands.
Table 2. Truth Table (Note (1), (2) )
Command
State CKEn-1 CKEn DM BS0,1 A10 A0-9,11 /CS /RAS /CAS /WE
BankActivate
Idle(3)
H
X X V Row address L L H H
BankPrecharge
Any
H
X X VL
X
LL H L
PrechargeAll
Any
H
X X XH
X
LL H L
Write
Write and AutoPrecharge
Active(3) H
Active(3) H
X
X
V L Column L H
L
L
address
X
X
V H (A0 ~ A7) L H
L
L
Read
Read and Autoprecharge
Active(3) H
Active(3) H
X
X
V L Column L H
L
H
address
X
X
V H (A0 ~ A7) L H
L
H
Mode Register Set
Idle
H
XX
OP code
LL L L
Extended MRS
Idle
H
XX
OP code
LL L L
No-Operation
Any
H
X X XX
X
LH H H
Burst Stop
Active(4) H
X X XX
X
LH H L
Device Deselect
Any
H
X X XX
X
HX X X
AutoRefresh
Idle
H
H X XX
X
LL L H
SelfRefresh Entry
Idle
H
L X XX
X
LL L H
SelfRefresh Exit
Idle
L
H X XX
X
HX X X
(SelfRefresh)
LH H H
Clock Suspend Mode Entry
Active H
L X XX
X
XX X X
Power Down Mode Entry
Any(5)
H
L X XX
X
HX X X
LH H H
Clock Suspend Mode Exit
Active L
H X XX
X
XX X X
Power Down Mode Exit
Any
L
H X XX
X
HX X X
(PowerDown)
LH H H
Data Write/Output Enable
Active H
X L XX
X
XX X X
Data Mask/Output Disable
Active H
X H XX
X
XX X X
Note:
1. V=Valid data, 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 cycle before the commands are provided.
3. These are states of bank designated by BS signal.
4. Device state is 1, 2, 4, 8, and full page burst operation.
5. Power Down Mode can not enter in the burst operation.
When this command is asserted in the burst cycle, device state is clock suspend mode.
Etron Confidential
5
Rev. 1.1
Jan. 2002
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