EM42AM1684RBA Datasheet, PDF (11/19 Pages) Eorex Corporation – 256Mb (4M×4Bank×16) Double DATA RATE SDRAM

eorex
Preliminary
EM42AM1684RBA
3. Operative Command Table
Current
State
/CS
/R
/C
/W
Addr.
H XX X
X
L HH H
X
L HH L
X
L H L X BA/CA/A10
Idle
L L H H BA/RA
L L H L BA, A10
L LLH
X
L
L
L
L
Op-Code,
Mode-Add
H XX X
X
L HH H
X
L H H L BA/CA/A10
Row
Active
L H L L BA/CA/A10
L L H H BA/RA
L L H L BA/A10
L LLH
X
L
L
L
L
Op-Code,
Mode-Add
H XX X
X
L HH H
X
L HH L
X
Read
L H L H BA/CA/A10
L L H H BA/RA
L L H L BA, A10
L LLH
X
L
L
L
L
Op-Code,
Mode-Add
H XX X
X
L HH H
X
L HH L
X
L H L H BA/CA/A10
Write
L H L L BA/CA/A10
L L H H BA/RA
L L H L BA, A10
L LLH
X
L L L L Op-Code,
Command
DESL
NOP
TERM
READ/WRIT/BW
ACT
PRE/PREA
REFA
MRS
DESL
NOP
READ/READA
WRIT/WRITA
ACT
PRE/PREA
REFA
MRS
DESL
NOP
TERM
READ/READA
ACT
PRE/PREA
REFA
MRS
DESL
NOP
TERM
READ/READA
WRIT/WRITA
ACT
PRE/PREA
REFA
MRS
Action
NOP
NOP
NOP
ILLEGAL ^{(Note 1)}
Bank active,Latch RA
NOP^{(Note 3)}
Auto refresh^{(Note 4)}
Mode register
NOP
NOP
Begin read,Latch CA,
Determine auto-precharge
Begin write,Latch CA,
Determine auto-precharge
ILLEGAL ^{(Note 1)}
Precharge/Precharge all
ILLEGAL
ILLEGAL
NOP(Continue burst to end)
NOP(Continue burst to end)
Terminal burst
Terminate burst,Latch CA,
Begin new read,
Determine Auto-precharge
ILLEGAL ^{(Note 1)}
Terminate burst, PrecharE
ILLEGAL
ILLEGAL
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)}
Terminate burst,Latch CA,Begin
new write, Determine
auto-precharge ^{(Note 2)}
ILLEGAL ^{(Note 1)}
Terminate burst with DM=”H”,
Precharge
ILLEGAL
ILLEGAL
Jul. 2006
11/19
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