EM48AMM1684VTG
4. Operative Command Table (Continued) (Note 7)
Current
/CS /R /C /W
Addr.
Command
Action
Notes
state
H
L
L
L
L
L
L
L
L
H
X
H
H
H
H
L
X
H
H
L
X
H
L
X
X
X
DESL
NOP
BST
Nop→ Enter row active after tDPL
Nop→ Enter row active after tDPL
Nop→ Enter row active after tDPL
Write
H
L
BA/CA/A10 READ/READA Start read, Determine AP
BA/CA/A10 WRIT/WRITA New write, Determine AP
recovering
L
14
9
H
H
L
H
L
BA/RA
BA, A10
X
ACT
ILLEGAL
L
PRE/PALL ILLEGAL
REF/SELF ILLEGAL
9
L
H
L
L
L
Op-Code
X
MRS
ILLEGAL
Nop→ Enter pre-charge after tDPL
X
X
X
DESL
L
L
L
L
L
L
L
L
H
L
L
L
L
H
H
H
H
H
L
H
H
L
H
L
X
X
NOP
BST
Nop→ Enter pre-charge after tDPL
Nop→ Enter pre-charge after tDPL
Write
H
L
BA/CA/A10 READ/READA ILLEGAL
BA/CA/A10 WRIT/WRITA ILLEGAL
9,14
9
recovering
with AP
L
H
H
L
H
L
BA/RA
ACT
ILLEGAL
9
L
BA, A10
PRE/PALL ILLEGAL
REF/SELF ILLEGAL
L
H
L
X
L
L
Op-Code
MRS
ILLEGAL
X
H
H
L
X
X
X
X
X
X
X
H
L
X
X
X
X
X
X
X
X
X
X
DESL
Nop→ Enter idle after tRC
H
L
NOP/ BST Nop→ Enter idle after tRC
READ/WRIT ILLEGAL
Refreshing
H
L
ACT/PRE/PALL ILLEGAL
L
REF/SELF/MRS ILLEGAL
X
H
H
H
L
X
H
H
L
DESL
NOP
BST
Nop
L
Nop
Mode
L
L
L
ILLEGAL
Register
Accessing
X
X
READ/WRIT ILLEGAL
X
ACT/PRE/PALL/
ILLEGAL
REF/SELF/MRS
Remark H = High level, L = Low level, X = High or Low level (Don't care), AP = Auto Pre-charge
Note 7: All entries assume that CKE was active (High level) during the preceding clock cycle.
Note 8: If all banks are idle, and CKE is inactive (Low level), SDRAM will enter Power down mode.
All input buffers except CKE will be disabled.
Note 9: Illegal to bank in specified states;
Function may be legal in the bank indicated by Bank Address (BA), depending on the state of that bank.
Note 10: If all banks are idle, and CKE is inactive (Low level), SDRAM will enter Self refresh mode.
All input buffers except CKE will be disabled.
Note 11: Illegal if tRCD is not satisfied.
Note 12: Illegal if tRAS is not satisfied.
Note 13: Must satisfy burst interrupt condition.
Note 14: Must satisfy bus contention, bus turn around, and/or write recovery requirements.
Note 15: Must mask preceding data which don't satisfy tDPL
Note 16: Illegal if tRRD is not satisfied.
.
Jun. 2010
18/20
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