Table of operating modes – Rainbow Electronics W9864G6GB User Manual
Page 12
W9864G6GB
- 12 -
8. TABLE OF OPERATING MODES
Fully synchronous operations are performed to latch the commands at the positive edges of CLK.
Table 1 shows the truth table for the operation commands.
TABLE 1 TRUTH TABLE (NOTE (1), (2))
COMMAND
DEVICE
STATE
CKEN-1 CKEN DQM BS0, 1 A10 A0-A9
CS
RAS
CAS
WE
Bank
Active
Idle H x x v v V L L H
H
Bank Precharge
Any
H
x
x
v
L
x
L
L
H
L
Precharge All
Any
H
x
x
x
H
x
L
L
H
L
Write Active
(3)
H
x
x
v
L
v
L
H
L
L
Write with
Autoprecharge
Active (3)
H
x
x
v
H
v
L
H
L
L
Read Active
(3)
H
x
x
v
L
v
L
H
L
H
Read with
Autoprecharge
Active (3)
H
x
x
v
H
v
L
H
L
H
Mode Register Set
Idle
H
x
x
v
v
v
L
L
L
L
No-Operation Any
H
x
x
x
x
x
L
H
H
H
Burst Stop
Active (4)
H
x
x
x
x
x
L
H
H
L
Device Deselect
Any
H
x
x
x
x
x
H
x
x
x
Auto-Refresh
Idle H H x x x x L L L
H
Self-Refresh
Entry
Idle H L x x x x L L L
H
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
x
Clock suspend Mode
Entry
Active H L
x x
x
x x x x
x
Power Down 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
Clock Suspend Mode
Exit
Active L H
x x
x
x x x x
X
Power Down Mode Exit
Any
(power
down)
L
L
H
H
x
x
x
x
x
x
x
x
H
L
x
H
x
H
X
H
Data write/Output
Enable
Active H x
L x
x
x x x x
x
Data Write/Output
Disable
Active H x
H x x x x x x
x
Notes:
(1) v = valid, x = Don't care, L = Low Level, H = High Level
(2) CKEn signal is input leve l when commands are provided.
(3) These are state of bank designated by BS0, BS1 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.