EDS2508APSA-75 データシートの表示（PDF） - Elpida Memory, Inc
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EDS2508APSA-75 Datasheet PDF : 51 Pages
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EDS2508APSA, EDS2516APSA
Function Truth Table
The following table shows the operations that are performed when each command is issued in each mode of the
SDRAM.
The following table assumes that CKE is high.
Current state
/CS /RAS /CAS /WE Address
Command
Operation
Precharge
H
×
×
×
×
DESL
Enter IDLE after tRP
L
H
H
H
×
NOP
Enter IDLE after tRP
L
H
H
L
×
BST
ILLEGAL
L
H
L
H
BA, CA, A10 READ/READA
ILLEGAL*3
L
H
L
L
BA, CA, A10 WRIT/WRITA
ILLEGAL*3
L
L
H
H
BA, RA
ACT
ILLEGAL*3
L
L
H
L
BA, A10
PRE, PALL
NOP*5
L
L
L
H
×
L
L
L
L
MODE
REF, SELF
MRS
ILLEGAL
ILLEGAL
Idle
H
×
×
×
×
DESL
NOP
L
H
H
H
×
NOP
NOP
L
H
H
L
×
BST
ILLEGAL
L
H
L
H
BA, CA, A10 READ/READA
ILLEGAL*4
L
H
L
L
BA, CA, A10 WRIT/WRITA
ILLEGAL*4
L
L
H
H
BA, RA
ACT
Bank and row active
L
L
H
L
BA, A10
PRE, PALL
NOP
L
L
L
H
×
L
L
L
L
MODE
REF, SELF
MRS
Refresh
Mode register set*8
Row active
H
×
×
×
×
DESL
NOP
L
H
H
H
×
NOP
NOP
L
H
H
L
×
BST
ILLEGAL
L
H
L
H
BA, CA, A10 READ/READA
Begin read*6
L
H
L
L
BA, CA, A10 WRIT/WRITA
Begin write*6
L
L
H
H
BA, RA
L
L
H
L
BA, A10
ACT
PRE, PALL
Other bank active
ILLEGAL on same bank*2
Precharge*7
L
L
L
H
×
L
L
L
L
MODE
REF, SELF
MRS
ILLEGAL
ILLEGAL
Read
H
×
×
×
×
DESL
Continue burst to end
L
H
H
H
×
NOP
Continue burst to end
L
H
H
L
×
BST
Burst stop
L
H
L
H
BA, CA, A10 READ/READA
Continue burst read to /CAS
latency and New read
L
H
L
L
BA, CA, A10 WRIT/WRITA
Term burst read/start write
L
L
H
H
BA, RA
ACT
Other bank active
ILLEGAL on same bank*2
L
L
H
L
BA, A10
PRE, PALL
Term burst read and Precharge
L
L
L
H
×
L
L
L
L
MODE
REF, SELF
MRS
ILLEGAL
ILLEGAL
Data Sheet E0228E30 (Ver. 3.0)
18
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