White Electronic Designs
CURRENT STATE TRUTH TABLE (cont.)
Command
Current State
CE#
L
L
L
L
Write with
Auto Precharge
L
L
L
L
H
L
L
L
L
Precharging
L
L
L
L
H
L
L
L
L
Row Activating
L
L
L
L
H
L
L
L
L
Write
Recovering
L
L
L
L
H
L
L
L
Write
ecovering with
Auto Precharge
L
L
L
L
L
H
RAS#
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
H
H
H
H
X
L
L
L
L
H
H
H
H
X
CAS#
L
L
H
H
L
L
H
H
X
L
L
H
H
L
L
H
H
X
L
L
H
H
L
L
H
H
X
L
L
H
H
L
L
H
H
X
L
L
H
H
L
L
H
H
X
WE#
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
H
L
H
L
H
L
H
X
X
X
BA
BA
BA
X
X
X
X
X
BA
BA
BA
X
X
X
OP Code
X
X
Row Address
Column
Column
X
X
X
X
X
BA
BA
BA
X
X
X
OP Code
X
X
Row Address
Column
Column
X
X
X
X
X
BA
BA
BA
X
X
X
OP Code
X
X
Row Address
Column
Column
X
X
X
X
X
BA
BA
BA
X
X
X
OP Code
X
X
Row Address
Column
Column
X
X
X
BA0-1
A0-A12
OP Code
X
X
Row Address
Column
Column
X
X
X
Description
Mode Register Set
Auto orSelf Refresh
Precharge
Bank Activate
Write
Read
Burst Termination
No Operation
Device Deselect
Mode Register Set
Auto orSelf Refresh
Precharge
Bank Activate
Write w/o Precharge
Read w/o Precharge
Burst Termination
No Operation
Device Deselect
Mode Register Set
Auto orSelf Refresh
Precharge
Bank Activate
Write
Read
Burst Termination
No Operation
Device Deselect
Mode Register Set
Auto orSelf Refresh
Precharge
Bank Activate
Write
Read
Burst Termination
No Operation
Device Deselect
Mode Register Set
Auto orSelf Refresh
Precharge
Bank Activate
Write
Read
Burst Termination
No Operation
Device Deselect
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
Continue the Burst
Continue the Burst
ILLEGAL
ILLEGAL
Action
Notes
WED3DL3216V
4
No Operation; Bank(s) idle after t
RP
ILLEGAL
ILLEGAL
ILLEGAL
No Operation; Bank(s) idle after t
RP
No Operation; Bank(s) idle after t
RP
No Operation; Bank(s) idle after t
RP
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
No Operation; Row active after t
RCD
No Operation; Row active after t
RCD
No Operation; Row active after t
RCD
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
Start Write; Determine if Auto Precharge
Start Read; Determine if Auto Precharge
No Operation; Row active after t
DPL
No Operation; Row active after t
DPL
No Operation; Row active after t
DPL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
No Operation; Precharge after t
DPL
No Operation; Precharge after t
DPL
No Operation; Precharge after t
DPL
4
4,9
4
9
4
4,10
4
4
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
January, 2004
Rev. 0
9
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
WEDC [ WHITE ELECTRONIC DESIGNS CORPORATION ]
