White Electronic Designs
Command
VCCAS#
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
VCWE#
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
VCBS
X
X
BA
BA
BA
X
X
X
X
BA
BA
BA
X
X
X
X
BA
BA
BA
X
X
X
X
BA
BA
BA
X
X
X
X
BA
BA
BA
X
X
VCADDR
OP Code
X
X
Row Address
Column
Column
X
X
OP Code
X
X
Row Address
Column
Column
X
X
OP Code
X
X
Row Address
Column
Column
X
X
OP Code
X
X
Row Address
Column
Column
X
X
OP Code
X
X
Row Address
Column
Column
X
X
WED9LAPC2C16V8BC
SDRAM CURRENT STATE TRUTH TABLE (CONT.)
Current State
VCRAS#
L
L
L
L
Write with
Auto Precharge
H
H
H
H
L
L
L
L
Precharging
H
H
H
H
L
L
L
L
Row Activating
H
H
H
H
L
L
L
L
Write Recovering
H
H
H
H
L
L
L
Write Recovering
L
with Auto
H
Precharge
H
H
H
Action
Description
Mode Register Set
ILLEGAL
Auto or Self Refresh
ILLEGAL
Precharge
ILLEGAL
Bank Activate
ILLEGAL
Write
ILLEGAL
Read
ILLEGAL
Burst Termination
ILLEGAL
No Operation
Continue the Burst
Mode Register Set
ILLEGAL
Auto or Self Refresh
ILLEGAL
Precharge
No Operation; Bank(s) idle after t
RP
Bank Activate
ILLEGAL
Write w/o Precharge
ILLEGAL
Read w/o Precharge
ILLEGAL
Burst Termination
No Operation; Bank(s) idle after t
RP
No Operation
No Operation; Bank(s) idle after t
RP
Mode Register Set
ILLEGAL
Auto or Self Refresh
ILLEGAL
Precharge
ILLEGAL
Bank Activate
ILLEGAL
Write
ILLEGAL
Read
ILLEGAL
Burst Termination
No Operation; Row active after t
RCD
No Operation
No Operation; Row active after t
RCD
Mode Register Set
ILLEGAL
Auto orSelf Refresh
ILLEGAL
Precharge
ILLEGAL
Bank Activate
ILLEGAL
Write
Start Write; Determine if Auto Precharge
Read
Start Read; Determine if Auto Precharge
Burst Termination
No Operation; Row active after t
DPL
No Operation
No Operation; Row active after t
DPL
Mode Register Set
ILLEGAL
Auto orSelf Refresh
ILLEGAL
Precharge
ILLEGAL
Bank Activate
ILLEGAL
Write
ILLEGAL
Read
ILLEGAL
Burst Termination
No Operation; Precharge after t
DPL
No Operation
No Operation; Precharge after t
DPL
Notes
2
2
2
2
20
2
2
2
2
2
2
6
6
2
2
2,6
2,6
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
July, 2000
Rev. 0
9
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
WEDC [ WHITE ELECTRONIC DESIGNS CORPORATION ]
