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EDD2508AKTA-5 Datasheet(PDF) 15 Page - Elpida Memory

Part No. EDD2508AKTA-5
Description  256M bits DDR SDRAM (32M words x 8 bits, DDR400)
Download  48 Pages
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Manufacturer  ELPIDA [Elpida Memory]
Direct Link  http://www.elpida.com/en
Logo ELPIDA - Elpida Memory

EDD2508AKTA-5 Datasheet(HTML) 15 Page - Elpida Memory

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EDD2508AKTA-5
Preliminary Data Sheet E0349E60 (Ver. 6.0)
15
Function Truth Table
The following tables show the operations that are performed when each command is issued in each state of the
DDR SDRAM.
Current state
/CS
/RAS
/CAS /WE
Address
Command
Operation
Next state
Precharging*
1
H
×
×
×
×
DESL
NOP
ldle
L
H
H
H
×
NOP
NOP
ldle
L
H
H
L
×
BST
ILLEGAL*
11
L
H
L
H
BA, CA, A10
READ/READA
ILLEGAL*
11
L
H
L
L
BA, CA, A10
WRIT/WRITA
ILLEGAL*
11
L
L
H
H
BA, RA
ACT
ILLEGAL*
11
L
L
H
L
BA, A10
PRE, PALL
NOP
ldle
L
L
L
×
×
ILLEGAL
Idle*
2
H
×
×
×
×
DESL
NOP
ldle
L
H
H
H
×
NOP
NOP
ldle
L
H
H
L
×
BST
ILLEGAL*
11
L
H
L
H
BA, CA, A10
READ/READA
ILLEGAL*
11
L
H
L
L
BA, CA, A10
WRIT/WRITA
ILLEGAL*
11
L
L
H
H
BA, RA
ACT
Activating
Active
L
L
H
L
BA, A10
PRE, PALL
NOP
ldle
L
L
L
H
×
REF, SELF
Refresh/
Self refresh*
12
ldle/
Self refresh
L
L
L
L
MODE
MRS
Mode register set*
12
ldle
Refresh
(auto-refresh)*
3
H
×
×
×
×
DESL
NOP
ldle
L
H
H
H
×
NOP
NOP
ldle
L
H
H
L
×
BST
ILLEGAL
L
H
L
×
×
ILLEGAL
L
L
×
×
×
ILLEGAL
Activating*
4
H
×
×
×
×
DESL
NOP
Active
L
H
H
H
×
NOP
NOP
Active
L
H
H
L
×
BST
ILLEGAL*
11
L
H
L
H
BA, CA, A10
READ/READA
ILLEGAL*
11
L
H
L
L
BA, CA, A10
WRIT/WRITA
ILLEGAL*
11
L
L
H
H
BA, RA
ACT
ILLEGAL*
11
L
L
H
L
BA, A10
PRE, PALL
ILLEGAL*
11
L
L
L
×
×
ILLEGAL
Active*
5
H
×
×
×
×
DESL
NOP
Active
L
H
H
H
×
NOP
NOP
Active
L
H
H
L
×
BST
ILLEGAL
Active
L
H
L
H
BA, CA, A10
READ/READA
Starting read operation Read/READA
L
H
L
L
BA, CA, A10
WRIT/WRITA
Starting write
operation
Write
recovering/
precharging
L
L
H
H
BA, RA
ACT
ILLEGAL*
11
L
L
H
L
BA, A10
PRE, PALL
Pre-charge
Idle
L
L
L
×
×
ILLEGAL


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