50S116T
SDRAM
8. TABLE OF OPERATING MODES
Fully synchronous operations are performed to latch the commands at the positive edges of CLK.
Table 3 shows the truth table for the operation commands.
Table 3 Truth Table (Note 1, 2)
COMMAND
DEVICE CKEn-1 CKEn DQM BA A10 A9-0
STATE
WE
CS
RAS CAS
Idle
Any
H
H
H
H
H
X
X
X
X
X
X
X
X
X
X
V
V
X
V
V
V
L
V
X
X
V
V
L
L
L
L
L
L
L
H
H
H
L
H
L
L
L
L
Bank Active
Bank Precharge
Precharge All
Write
Any
H
L
L
Active (3)
Active (3)
H
H
H
L
Write with Auto
Precharge
Active (3)
Active (3)
H
H
X
X
X
X
V
V
L
V
V
L
L
H
H
L
L
H
H
Read
H
Read with Auto
Precharge
Idle
Any
H
H
H
H
H
H
X
X
X
X
H
L
X
X
X
X
X
X
V
X
X
X
X
X
V
X
X
X
X
X
V
X
X
X
X
X
L
L
L
H
L
L
L
H
H
X
L
L
H
H
X
L
L
H
L
Mode Register Set
No Operation
Active (4)
Any
Burst Stop
X
H
H
Device Deselect
Auto Refresh
Idle
Idle
L
L
Self Refresh Entry
Self Refresh Exit
Idle
(S.R)
L
L
H
H
X
X
X
X
X
X
X
X
H
L
X
H
X
H
X
H
Active
H
L
X
X
X
X
X
X
X
X
Clock Suspend Mode
Entry
Idle
Active (5)
H
H
L
L
X
X
X
X
X
X
X
X
H
L
X
H
X
H
X
H
Power-down Mode Entry
Active
L
H
X
X
X
X
X
X
X
X
Clock Suspend Mode
Exit
Any
(Power-
down)
L
L
H
H
X
X
X
X
X
X
X
X
H
L
X
H
X
H
X
Power-down Mode Exit
H
Active
H
H
X
X
L
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Data Write/Output
Enable
Active
H
Data Write/Output
Disable
Notes:
(1) V = Valid, X = Don't care, L = Low Level, H = High Level
(2) CKEn signal is input level when commands are provided.
(3) These are state of bank designated by BA signals.
(4) Device state is full page burst operation.
(5) Power-down Mode can not be entered in the burst cycle.
When this command asserts in the burst cycle, device state is clock suspend mode.
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN, R.O.C
Tel:886-3-3214525
Email: server@ceramate.com.tw
Http: www.ceramate.com.tw
Rev 1.0 Aug.20,2002
Page 12 of 42
Fax:886-3-3521052
CERAMATE [ CERAMATE TECHNICAL ]
