WED3DL644V
White Electronic Designs
CURRENT STATE TRUTH TABLE (CONT.)
Command
Current State
Action
Notes
A11,
A10/AP-A0
CE#
RAS#
CAS#
WE#
BA0-1
Description
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
H
H
L
L
H
L
H
L
H
L
H
X
L
H
L
H
L
H
L
H
X
L
H
L
H
L
H
L
H
X
L
H
L
H
L
H
L
H
X
L
OP Code
Mode Register Set
Auto or Self Refresh
Precharge
Bank Activate
Write
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
X
X
BA
BA
BA
X
X
X
4
4
L
Row Address
Column
Column
Write with
H
H
H
H
X
L
L
L
L
H
H
H
H
X
L
L
L
L
H
H
H
H
X
L
L
L
L
H
H
H
H
X
L
L
L
L
Auto Precharge
L
Read
ILLEGAL
ILLEGAL
H
H
X
L
X
X
X
Burst Termination
No Operation
Device Deselect
Mode Register Set
Auto or Self Refresh
Precharge
Bank Activate
Write w/o Precharge
Read w/o Precharge
Burst Termination
No Operation
Device Deselect
Mode Register Set
Auto or Self Refresh
Precharge
X
X
Continue the Burst
Continue the Burst
ILLEGAL
OP Code
L
X
X
BA
BA
BA
X
X
X
ILLEGAL
No Operation; Bank(s) idle after tRP
ILLEGAL
ILLEGAL
ILLEGAL
No Operation; Bank(s) idle after tRP
No Operation; Bank(s) idle after tRP
No Operation; Bank(s) idle after tRP
ILLEGAL
H
H
L
Row Address
Column
Column
4
4
4
Precharging
L
H
H
X
L
X
X
X
X
X
OP Code
L
X
X
BA
BA
BA
X
X
X
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
H
H
L
4
4,10
4
Row Address
Column
Column
Bank Activate
Write
Row Activating
L
Read
ILLEGAL
4
H
H
X
L
X
X
X
Burst Termination
No Operation
Device Deselect
Mode Register Set
Auto or Self Refresh
Precharge
No Operation; Row active after tRCD
No Operation; Row active after tRCD
No Operation; Row active after tRCD
ILLEGAL
X
X
OP Code
L
X
X
BA
BA
BA
X
X
X
ILLEGAL
ILLEGAL
ILLEGAL
H
H
L
4
4
9
9
Row Address
Column
Column
Bank Activate
Write
Write
Recovering
Start Write; Determine if Auto Precharge
Start Read; Determine if Auto Precharge
No Operation; Row active after tDPL
No Operation; Row active after tDPL
No Operation; Row active after tDPL
ILLEGAL
L
Read
H
H
X
L
X
X
X
Burst Termination
No Operation
Device Deselect
Mode Register Set
Auto or Self Refresh
Precharge
X
X
OP Code
L
H
L
H
L
H
L
H
X
X
X
BA
BA
BA
X
X
X
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
H
H
L
4
4
4,9
4,9
Write
Row Address
Column
Column
Bank Activate
Write
Recovering
with Auto
Precharge
H
H
H
H
X
L
Read
ILLEGAL
H
H
X
X
X
X
Burst Termination
No Operation
Device Deselect
No Operation; Precharge after tDPL
No Operation; Precharge after tDPL
No Operation; Precharge after tDPL
X
X
August 2005
Rev. 6
10
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
WEDC [ WHITE ELECTRONIC DESIGNS CORPORATION ]
