eorex
EM42BM3284LBA
3. Operative Command Table
Current
State
/CS /R /C /W
Addr.
Command
Action
H
L
L
L
X
H
H
H
X
H
H
L
X
H
L
X
X
X
DESL
NOP
NOP
NOP
NOP
TERM
ILLEGAL (Note 1)
Bank active,Latch RA
NOP(Note 3)
X
BA/CA/A10 READ/WRIT/BW
Idle
L
L
L
L
L
L
H
H
L
H
L
BA/RA
BA, A10
X
ACT
PRE/PREA
REFA
Auto refresh(Note 4)
H
Op-Code,
Mode-Add
L
L
L
L
MRS
Mode register
H
L
X
H
X
H
X
H
X
X
DESL
NOP
NOP
NOP
Begin read,Latch CA,
Determine auto-precharge
Begin write,Latch CA,
L
L
H
H
H
L
L
L
BA/CA/A10
BA/CA/A10
READ/READA
WRIT/WRITA
Row
Determine auto-precharge
Active
ILLEGAL (Note 1)
Precharge/Precharge all
ILLEGAL
L
L
L
L
L
L
H
H
L
H
L
BA/RA
BA/A10
X
ACT
PRE/PREA
REFA
H
Op-Code,
Mode-Add
L
L
L
L
MRS
ILLEGAL
H
L
L
X
H
H
X
H
H
X
H
L
X
X
X
DESL
NOP
TERM
NOP(Continue burst to end)
NOP(Continue burst to end)
Terminal burst
Terminate burst,Latch CA,
Begin new read,
L
H
L
H
H
BA/CA/A10
READ/READA
Read
Determine Auto-precharge
ILLEGAL (Note 1)
L
L
H
BA/RA
ACT
L
L
L
L
H
L
L
BA, A10
PRE/PREA
REFA
Terminate burst, PrecharE
ILLEGAL
H
X
Op-Code,
Mode-Add
L
L
L
L
MRS
ILLEGAL
H
L
L
X
H
H
X
H
H
X
H
L
X
X
X
DESL
NOP
TERM
NOP(Continue burst to end)
NOP(Continue burst to end)
ILLEGAL
Terminate burst with DM=”H”,Latch
CA,Begin read,Determine
auto-precharge (Note 2)
L
L
H
H
L
L
H
L
BA/CA/A10
BA/CA/A10
READ/READA
WRIT/WRITA
Terminate burst,Latch CA,Begin
new write, Determine
auto-precharge (Note 2)
ILLEGAL (Note 1)
Write
L
L
L
L
H
H
H
L
BA/RA
ACT
Terminate burst with DM=”H”,
BA, A10
PRE/PREA
Precharge
ILLEGAL
ILLEGAL
L
L
L
L
L
L
H
L
X
REFA
MRS
Op-Code,
Feb. 2009
www.eorex.com
13/24
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