EM42BM1684RBA
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
DESL
NOP
NOP
NOP
X
X
TERM
NOP
ILLEGAL (Note 1)
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
Bank active,Latch RA
NOP(Note 3)
Auto refresh(Note 4)
H
Op-Code,
Mode-Add
L
L
L
L
MRS
Mode register
NOP
H
L
X
H
X
H
X
H
X
X
DESL
NOP
NOP
Begin read,Latch CA, Determine
auto-precharge
L
L
H
H
H
L
L
L
BA/CA/A10
BA/CA/A10
READ/READA
WRIT/WRITA
Begin write,Latch CA, Determine
auto-precharge
Row
Active
ILLEGAL (Note 1)
L
L
L
L
L
L
H
H
L
H
L
BA/RA
BA/A10
X
ACT
PRE/PREA
REFA
Precharge/Precharge all
ILLEGAL
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
NOP(Continue burst to end)
NOP(Continue burst to end)
Terminal burst
TERM
Read
Terminate burst,Latch CA, Begin new
read, Determine Auto-precharge
L
H
L
H
BA/CA/A10
READ/READA
ILLEGAL (Note 1)
L
L
H
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
NOP(Continue burst to end)
NOP(Continue burst to end)
ILLEGAL
TERM
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
Write
Terminate burst,Latch CA,Begin new
write, Determine auto-precharge (Note 2)
ILLEGAL (Note 1)
L
L
L
L
H
H
H
L
BA/RA
ACT
Terminate burst with DM=”H”, Precharge
BA, A10
PRE/PREA
L
L
L
L
L
L
H
L
X
REFA
MRS
ILLEGAL
ILLEGAL
Op-Code,
Dec. 2010
14/23
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