M2S56D20AKT Просмотр технического описания (PDF) - Mitsumi
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M2S56D20AKT Datasheet PDF : 37 Pages
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DDR SDRAM (Rev.1.0)
Jul. '01 Preliminary
MITSUBISHI LSIs
M2S56D20/ 30/ 40AKT
256M Double Data Rate Synchronous DRAM
FUNCTION TRUTH TABLE
Current State /CS /RAS /CAS /WE Address
Command
IDLE
HX
X XX
DESEL
LH
H HX
NOP
LH
H L BA
TERM
LH
L X BA, CA, A10 READ / WRITE
LL
H H BA, RA
ACT
LL
H L BA, A10
PRE / PREA
LL
L HX
REFA
LL
Op-Code, Mode-
LL
MRS
Add
ROW ACTIVE H X
X XX
DESEL
LH
H HX
NOP
LH
H L BA
TERM
LH
L H BA, CA, A10 READ / READA
LH
LL
LL
LL
LL
READ(Auto- H X
Precharge
LH
Disabled)
LH
L L BA, CA, A10 WRITE / WRITEA
H H BA, RA
ACT
H L BA, A10
PRE / PREA
L HX
REFA
Op-Code, Mode-
LL
MRS
Add
X XX
DESEL
H HX
NOP
H L BA
TERM
LH
L H BA, CA, A10 READ / READA
LH
LL
LL
LL
LL
L
L BA, CA, A10
WRITE / WRITEA
H H BA, RA
ACT
H L BA, A10
PRE / PREA
L HX
REFA
Op-Code, Mode-
L
L
MRS
Add
Action
NOP
NOP
ILLEGAL
ILLEGAL
Bank Active, Latch RA
NOP
Auto-Refresh
Mode Register Set
NOP
NOP
NOP
Begin Read, Latch CA, Determine
Auto-Precharge
Begin Write, Latch CA, Determine
Auto-Precharge
Bank Active / ILLEGAL
Precharge / Precharge All
ILLEGAL
ILLEGAL
NOP (Continue Burst to END)
NOP (Continue Burst to END)
Terminate Burst
Terminate Burst, Latch CA, Begin
New Read, Determine Auto-
Precharge
ILLEGAL
Bank Active / ILLEGAL
Terminate Burst, Precharge
ILLEGAL
ILLEGAL
Notes
2
2
4
5
5
2
3
2
MITSUBISHI ELECTRIC
7
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