EDS2532EGBH-TT
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
H
L
/RAS /CAS /WE
Address
Command
DESL
Operation
Precharge
×
×
×
×
Enter IDLE after tRP
Enter IDLE after tRP
ILLEGAL
ILLEGAL*3
ILLEGAL*3
ILLEGAL*3
NOP*5
H
H
H
H
L
H
H
L
H
L
×
NOP
L
×
BST
L
H
L
BA, CA, A10
READ/READA
WRIT/WRITA
ACT
L
L
BA, CA, A10
L
H
H
L
H
L
BA, RA
L
L
BA, A10
PRE, PALL
REF, SELF
MRS
L
L
H
L
×
ILLEGAL
L
L
L
MODE
ILLEGAL
L
L
L
L
MODE
EMRS
ILLEGAL
Idle
H
L
×
×
×
×
DESL
NOP
H
H
H
H
L
H
H
L
H
L
×
NOP
NOP
L
×
BST
ILLEGAL
L
H
L
BA, CA, A10
READ/READA
WRIT/WRITA
ACT
ILLEGAL*4
ILLEGAL*4
Bank and row active
NOP
L
L
BA, CA, A10
L
H
H
L
H
L
BA, RA
L
L
BA, A10
PRE, PALL
REF, SELF
MRS
L
L
H
L
×
Refresh
L
L
L
MODE
Mode register set*8
Extended mode register set*8
NOP
L
L
L
L
MODE
EMRS
Row active
H
L
×
×
×
×
DESL
H
H
H
H
H
H
L
H
L
×
NOP
NOP
L
×
BST
ILLEGAL
L
H
L
BA, CA, A10
BA, CA, A10
READ/READA
WRIT/WRITA
Begin read*6
Begin write*6
L
L
Other bank active
L
L
H
H
BA, RA
ACT
ILLEGAL on same bank*2
L
L
L
L
L
L
L
L
H
L
L
L
L
H
L
L
BA, A10
×
PRE, PALL
REF, SELF
MRS
Precharge*7
ILLEGAL
ILLEGAL
ILLEGAL
MODE
MODE
EMRS
Preliminary Data Sheet E1200E40 (Ver. 4.0)
15
ELPIDA [ ELPIDA MEMORY ]
