EM44CM1688LBC_15 Datasheet, PDF (17/29 Pages) Eorex Corporation – Double DATA RATE 2 SDRAM

EM44CM1688LBC
3. Operative Command Table
Current
State
Idle
/CS /R /C /W
H XX X
L HH H
L HL H
L HL L
L LHH
L LH L
L LLH
L LL L
H XX X
L HH H
Addr.
X
X
BA/CA/A10
BA/CA/A10
BA/RA
BA, A10
X
Op-Code,
Mode-Add
X
X
L H L H BA/CA/A10
Bank
Active
Read
Write
L HL L
L LHH
L LH L
L LLH
L LL L
H XX X
L HH H
L HL H
L HL L
L LHH
L LH L
L LLH
L LL L
H XX X
L HH H
L HL H
L HL L
L LHH
L LH L
L LLH
L LL L
BA/CA/A10
BA/RA
BA/A10
X
Op-Code,
Mode-Add
X
X
BA/CA/A10
BA/CA/A10
BA/RA
BA, A10
X
Op-Code,
Mode-Add
X
X
BA/CA/A10
BA/CA/A10
BA/RA
BA, A10
X
Op-Code,
Command
Action
DESL
NOP
READ/READA
WRIT/WRITA
ACT
PRE/PREA
REF/SELF
NOP
NOP
ILLEGAL (Note 1)
ILLEGAL (Note 1)
Bank active,Latch RA
NOP(Note 3)
Auto/Self refresh(Note 4)
MRS/EMRS(1)(2) Mode register
DESL
NOP
READ/READA
WRIT/WRITA
ACT
PRE/PREA
REF/SELF
NOP
NOP
Begin read,Latch CA, Determine
auto-precharge
Begin write,Latch CA, Determine
auto-precharge
ILLEGAL (Note 1)
Precharge/Precharge all
ILLEGAL (Note 1)
MRS/EMRS(1)(2)
DESL
NOP
READ/READA
WRIT/WRITA
ACT
PRE/PREA
REF/SELF
MRS/EMRS(1)(2)
ILLEGAL (Note 1)
Row Active(Continue burst to end)
Row Active(Continue burst to end)
Burst Interrupt
ILLEGAL(Note 1)
ILLEGAL (Note 1)
ILLEGAL (Note 1)
ILLEGAL (Note 1)
ILLEGAL (Note 1)
DESL
NOP
READ/READA
WRIT/WRITA
ACT
PRE/PREA
REF/SELF
MRS/EMRS(1)(2)
Write recovering (Continue burst to end)
Write recovering (Continue burst to end)
ILLEGAL(Note 1)
Burst Interrupt
ILLEGAL (Note 1)
ILLEGAL (Note 1)
ILLEGAL (Note 1)
ILLEGAL (Note 1)
Apr. 2014
17/29
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