WED9LC6816V Ver la hoja de datos (PDF) - White Electronic Designs Corporation
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WED9LC6816V Datasheet PDF : 27 Pages
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White Electronic Designs
WED9LC6816V
SDRAM CURRENT STATE TRUTH TABLE
Current State
Idle
SDCE#
L
L
L
L
L
L
L
L
SDRAS #
L
L
L
L
H
H
H
H
SDCAS#
L
L
H
H
L
L
H
H
SDWE#
L
H
L
H
L
H
L
H
Command
A12 & A13 (BA)
OP Code
X
X
BA
BA
BA
X
X
A11-A0
Mode Register Set
X
X
Row Address
Column
Column
X
X
Description
Set the Mode Register
Auto or Self Refresh
Precharge
Bank Activate
Write w/o Precharge
Read w/o Precharge
Burst Termination
No Operation
Action
1
Start Auto
No Operation
Activate the specified bank and row
ILLEGAL
ILLEGAL
No Operation
No Operation
Notes
1
2
1
1
H
X
X
X
X
X
Device Deselect
No Operation
L
L
L
L
L
L
L
H
L
L
H
L
L
L
H
H
OP Code
X
X
X
X
BA
Row Address
Mode Register Set
Auto or Self Refresh
Precharge
Bank Activate
ILLEGAL
ILLEGAL
Precharge
3
ILLEGA
1
Row Active
L
H
L
L
BA
L
H
L
H
BA
L
H
H
L
X
L
H
H
H
X
Column
Column
X
X
Write
Read
Burst Termination
No Operation
Start Write; Determine if Auto Precharge
4,5
Start Read; Determine if Auto Precharge
4,5
No Operation
No Operation
H
X
X
X
X
X
Device Deselect
No Operation
L
L
L
L
L
L
L
L
Read
L
H
L
H
L
H
L
H
H
X
L
L
L
H
H
L
H
H
L
L
L
H
H
L
H
H
X
X
OP Code
X
X
X
X
BA
Row Address
BA
Column
BA
Column
X
X
X
X
X
X
Mode Register Set
Auto or Self Refresh
Precharge
Bank Activate
Write
Read
Burst Termination
No Operation
Device Deselect
ILLEGAL
ILLEGAL
Terminate Burst; Start the Precharge
ILLEGAL
2
Terminate Burst; Start the Write cycle
5,6
Terminate Burst; Start a new Read cycle
5,6
Terminate the Burst
Continue the Burst
Continue the Burst
L
L
L
L
OP Code
Mode Register Set
ILLEGAL
L
L
L
H
L
L
H
L
L
L
H
H
Write
L
H
L
L
L
H
L
H
L
H
H
L
L
H
H
H
H
X
X
X
L
L
L
L
L
L
L
H
L
L
H
L
L
L
H
H
Read with
L
H
Auto Precharge
L
H
L
L
L
H
L
H
H
L
X
X
X
X
BA
Row Address
BA
Column
BA
Column
X
X
X
X
X
X
OP Code
X
X
X
X
BA
Row Address
BA
Column
BA
Column
X
X
Auto or Self Refresh
Precharge
Bank Activate
Write
Read
Burst Termination
No Operation
Device Deselect
Mode Register Set
Auto or Self Refresh
Precharge
Bank Activate
Write
Read
Burst Termination
ILLEGAL
Terminate Burst; Start the Precharge
ILLEGAL
2
Terminate Burst; Start a new Write cycle
5,6
Terminate Burst; Start the Read cycle
5,6
Terminate the Burst
Continue the Burst
Continue the Burst
ILLEGAL
ILLEGAL
ILLEGAL
2
ILLEGAL
2
ILLEGAL
ILLEGAL
ILLEGAL
L
H
H
H
X
X
No Operation
Continue the Burst
H
X
X
X
X
X
Device Deselect
Continue the Burst
Contact factory for ordering information.
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
September, 2003
Rev. 1
11
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
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