M2S56D20AKP View Datasheet(PDF) - Elpida Memory, Inc
Part Name
Description
Manufacturer
M2S56D20AKP Datasheet PDF : 41 Pages
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DDR SDRAM
E0338M10 (Ver.1.0)
(Previous Rev.1.54E)
Jan. '03 CP(K)
M2S56D20/ 30/ 40ATP
M2S56D20/ 30/ 40AKT
256M Double Data Rate Synchronous DRAM
FUNCTION TRUTH TABLE (1/4)
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
LL
L
L
Op-Code,
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
LL
L
L
Op-Code,
Mode-Add
READ(Auto- H X X X X
Precharge L H H H X
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
LL
L
L
Op-Code,
Mode-Add
Command
DESEL
NOP
TERM
READ / WRITE
ACT
PRE / PREA
REFA
Action
NOP
NOP
ILLEGAL
ILLEGAL
Bank Active, Latch RA
NOP
Auto-Refresh
Notes
2
2
4
5
MRS
Mode Register Set
5
DESEL
NOP
NOP
NOP
TERM
NOP
READ / READA
WRITE / WRITEA
Begin Read, Latch CA,
Determine Auto-Precharge
Begin Write, Latch CA,
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, Begin
READ / READA New Read, Determine Auto-
3
Precharge
WRITE / WRITEA ILLEGAL
ACT
Bank Active / ILLEGAL
2
PRE / PREA
Terminate Burst, Precharge
REFA
ILLEGAL
MRS
ILLEGAL
9
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