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 (4/4)
Current State /CS /RAS /CAS /WE Address
REFRESHING H X X X X
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
MODE
H X X XX
REGISTER L H H H X
SETTING 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
Command
DESEL
NOP
TERM
READ / WRITE
ACT
PRE / PREA
REFA
MRS
DESEL
NOP
TERM
READ / WRITE
ACT
PRE / PREA
REFA
MRS
Action
NOP (Idle after tRFC)
NOP (Idle after tRFC)
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
NOP (Idle after tMRD)
NOP (Idle after tMRD)
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
Notes
ABBREVIATIONS:
H=High Level, L=Low Level, X=Don't Care
BA=Bank Address, RA=Row Address, CA=Column Address, NOP=No Operation
NOTES:
1. All entries are valid only when CKE was High during the preceding clock cycle and the current clock cycle.
2. ILLEGAL to bank in specified state; function may be legal in the bank indicated by BA, depending on the
state of specific bank.
3. Must satisfy bus contention, bus turn around, write recovery requirements.
4. NOP to bank precharging or in idle state. May precharge bank indicated by BA.
5. ILLEGAL if any bank is not idle.
6. Refer to Read with Auto-Precharge in page 28.
7. Refer to Write with Auto-Precharge in page 30.
ILLEGAL = Device operation and/or data-integrity are not guaranteed.
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