WED9LC6816V Ver la hoja de datos (PDF) - White Electronic Designs Corporation
Número de pieza
componentes Descripción
Fabricante
WED9LC6816V Datasheet PDF : 27 Pages
| |||
White Electronic Designs
WED9LC6816V
SDRAM Current State Truth Table (cont.)
Current State
Refreshing
Mode Register
Accessing
SDCE#
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
SDRAS #
L
L
L
L
H
H
H
H
X
L
L
L
L
H
H
H
H
X
SDCAS#
L
L
H
H
L
L
H
H
X
L
L
H
H
L
L
H
H
X
SDWE#
L
H
L
H
L
H
L
H
X
L
H
L
H
L
H
L
H
X
Command
A12 & A13 (BA)
A11-A0
OP Code
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
X
X
X
X
Description
Mode Register Set
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
No Operation
Device Deselect
Action
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
No Operation; Idle after tRC
No Operation; Idle after tRC
No Operation; Idle after tRC
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
No Operation; Idle after two clock cycles
No Operation; Idle after two clock cycles
Notes
NOTES:
1. Both Banks must be idle otherwise it is an illegal action.
2. The Current State refers only refers to one of the banks, if BA selects this bank then the action is illegal. If BA selects the bank not being referenced by the Current
State then the action may be legal depending on the state of that bank.
3. The minimum and maximum Active time (tRAS) must be satisfied.
4. The RAS# to CAS# Delay (tRCD) must occur before the command is given.
5. Address SDA10 is used to determine if the Auto Precharge function is activated.
6. The command must satisfy any bus contention, bus turn around, and/or write recovery requirements.
The command is illegal if the minimum bank to bank delay time (tRRD) is not satisfied.
Contact factory for ordering information.
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
September, 2003
Rev. 1
13
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
Share Link: 