WED3DL644V8BC Просмотр технического описания (PDF) - White Electronic Designs Corporation
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WED3DL644V8BC Datasheet PDF : 28 Pages
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White Electronic Designs
WED3DL644V
CLOCK ENABLE (CKE) TRUTH TABLE
CKE
Command
Current State
Previous Current
Cycle Cycle
CE#
RAS# CAS# WE# BA0-1
A10-11
Action
Notes
H
X
X
X
X
X
X
X
INVALID
1
L
H
H
X
X
X
X
X Exit Self Refresh with Device Deselect 2
L
H
L
HHH
X
X
Exit Self Refresh with No Operation
2
Self Refresh
L
H
L
H
H
L
X
X
ILLEGAL
2
L
H
L
H
L
X
X
X
ILLEGAL
2
L
H
L
L
X
X
X
X
ILLEGAL
2
L
L
X
X
X
X
X
X
Maintain Self Refresh
H
X
X
X
X
X
X
X
INVALID
1
Power Down
L
H
H
X
X
X
X
X Power Down Mode exit, all banks idle 2
L
H
L
X
X
X
X
X
ILLEGAL
2
H
X
L
H
L
L
X
Maintain Power Down Mode
2
H
H
H
X
X
X
H
H
L
H
X
X
H
H
L
L
HX
Refer to the Idle State section of the
Current State Truth Table
3
H
H
L
L
L
H
X
X
CBR Refresh
H
H
L
L
L
L
OP Code
Mode Register Set
4
All Banks Idle
H
H
H
H
L
H
X
X
X
L
L
H
X
X
L
L
L
HX
Refer to the Idle State section of the
3
Current State Truth Table
Entry Self Refresh
L
L
L
L
H
X
X
4
H
H
L
L
L
L
OP Code
Mode Register Set
L
X
X
X
X
X
X
X
Power Down
4
H
Any State other
H
than listed above
L
H
X
X
X
X
X
L
X
X
X
X
X
H
X
X
X
X
X
X
Refer to the Operations in the Current
State Truth Table
X
Begin Clock Suspend next cycle
5
X
Exit Clock Suspend next cycle
L
L
X
X
X
X
X
X
Maintain Clock Suspend
Notes:
1. For the given Current State CKE must be low in the previous cycle.
2. When CKE has a low to high transition, the clock and other inputs are re-enabled asynchronously. The minimum setup time for CKE (tCKS) must be satisfied before
any command other than Exit is issued.
3. The address inputs (A11-A0) depend on the command that is issued. See the Idle State section of the Current State Truth Table for more information.
4. The Power Down Mode, Self Refresh Mode, and the Mode Register Set can only be entered from the all banks idle state.
5. Must be a legal command as defined in the Current State Truth Table.
August 2005
Rev. 6
8
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
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