WED9LAPC2C16V4BC 查看數據表（PDF） - White Electronic Designs => Micro Semi
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WED9LAPC2C16V4BC Datasheet PDF : 23 Pages
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WED9LAPC2C16V4BC
Current State
Idle
Row Active
Read
Write
Read with
Auto Precharge
SDRAM CURRENT STATE TRUTH TABLE
Command
VCRAS VCCAS VCWE VCBS VCADDR
Description
Action
Notes
L
L
L
L
L
H
L
H
H
L
H
L
H
H
H
H
L
L
L
L
L
H
L
H
H
L
H
L
H
H
H
H
L
L
L
L
L
H
L
H
H
L
H
L
H
H
H
H
L
L
L
L
L
H
L
H
H
L
H
L
H
H
H
H
L
L
L
L
L
H
L
H
H
L
H
L
H
H
H
H
L
OP Code
Mode Register Set
Set the Mode Register
1
H
X
X
Auto or Self Refresh
Start Auto
1
L
X
X
Precharge
No Operation
H
BA Row Address Bank Activate
Activate the specified bank and row
L
BA
Column Write w/o Precharge
ILLEGAL
2
H
BA
Column Read w/o Precharge
ILLEGAL
1
L
X
X
Burst Termination
No Operation
1
H
X
X
No Operation
No Operation
L
OP Code
Mode Register Set
ILLEGAL
H
X
X
Auto or Self Refresh
ILLEGAL
L
X
X
Precharge
Precharge
3
H
BA Row Address Bank Activate
ILLEGAL
1
L
BA
Column
Write
Start Write; Determine if Auto Precharge 4,5
H
BA
Column
Read
Start Read; Determine if Auto Precharge 4,5
L
X
X
Burst Termination
No Operation
H
X
X
No Operation
No Operation
L
OP Code
Mode Register Set
ILLEGAL
H
X
X
Auto or Self Refresh
ILLEGAL
L
X
X
Precharge
Terminate Burst; Start the Precharge
H
BA Row Address Bank Activate
ILLEGAL
2
L
BA
Column
Write
Terminate Burst; Start the Write cycle 5,6
H
BA
Column
Read
Terminate Burst; Start a new Read cycle 5,6
L
X
X
Burst Termination
Terminate the Burst
H
X
X
No Operation
Continue the Burst
L
OP Code
Mode Register Set
ILLEGAL
H
X
X
Auto or Self Refresh
ILLEGAL
L
X
X
Precharge
Terminate Burst; Start the Precharge
H
BA Row Address Bank Activate
ILLEGAL
2
L
BA
Column
Write
Terminate Burst; Start a new Write cycle 5,6
H
BA
Column
Read
Terminate Burst; Start the Read cycle 5,6
L
X
X
Burst Termination
Terminate the Burst
H
X
X
No Operation
Continue the Burst
L
OP Code
Mode Register Set
ILLEGAL
H
X
X
Auto or Self Refresh
ILLEGAL
L
X
X
Precharge
ILLEGAL
2
H
BA Row Address Bank Activate
ILLEGAL
2
L
BA
Column
Write
ILLEGAL
H
BA
Column
Read
ILLEGAL
L
X
X
Burst Termination
ILLEGAL
H
X
X
No Operation
Continue the Burst
White Electronic Designs Corporation • (508) 366-5151 • www.whiteedc.com
8
July 2000 Rev. 0
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