M2S56D20TP Просмотр технического описания (PDF) - Mitsumi
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M2S56D20TP Datasheet PDF : 36 Pages
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DDR SDRAM (Rev.0.0)
Sep.'99 Preliminary
MITSUBISHI LSIs
M2S56D20/ 30 TP
256M Double Data Rate Synchronous DRAM
FUNCTION TRUTH TABLE
Current State /CS /RAS /CAS /WE Address
IDLE
H X X XX
L H H HX
L H H L BA
L H L X BA, CA, A10
L L H H BA, RA
L L H L BA, A10
L
L
L
HX
Op-Code,
L
L
L
L
Mode-Add
ROW ACTIVE H X X X X
L H H HX
L H H L BA
L H L H BA, CA, A10
L H L L BA, CA, A10
L L H H BA, RA
L L H L BA, A10
L
L
L
HX
Op-Code,
L
L
L
L
Mode-Add
READ
H X X XX
(Auto-
L H H HX
Precharge
Disabled)
L H H L BA
L H L H BA, CA, A10
L H L L BA, CA, A10
L L H H BA, RA
L L H L BA, A10
L
L
L
HX
Op-Code,
L
L
L
L
Mode-Add
Command
Action
DESEL NOP
NOP
NOP
TERM
ILLEGAL
READ / WRITE ILLEGAL
ACT
Bank Active, Latch RA
PRE / PREA NOP
REFA
Auto-Refresh
MRS
Mode Register Set
Notes
2
2
4
5
5
DESEL NOP
NOP
NOP
TERM
NOP
Begin Read, Latch CA,
READ / READA
Determine Auto-Precharge
WRITE / Begin Write, Latch CA,
WRITEA Determine Auto-Precharge
ACT
Bank Active / ILLEGAL
2
PRE / PREA Precharge / Precharge All
REFA
ILLEGAL
MRS
ILLEGAL
DESEL NOP (Continue Burst to END)
NOP
NOP (Continue Burst to END)
TERM
Terminate Burst
Terminate Burst, Latch CA,
READ / READA Begin New Read, Determine 3
Auto-Precharge
WRITE
WRITEA
ILLEGAL
ACT
Bank Active / ILLEGAL
2
PRE / PREA Terminate Burst, Precharge
REFA
ILLEGAL
MRS
ILLEGAL
MITSUBISHI
ELECTRIC
7
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