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
COMMAND TRUTH TABLE
COMMAND
Deselect
MNEMONIC CKE CKE /CS /RAS /CAS /WE BA0,1 A10 A0-9, Note
n-1 n
/AP 11-12
DESEL
H
X
H
X
X
X
X
X
X
No Operation
NOP
H
X
L
H
HHX
X
X
Row Address Entry &
Bank Activate
ACT
H
HL
L
HHV
V
V
Single Bank Precharge PRE
H
HL
L
HL
V
L
X
Precharge All Banks
PREA
H
H
L
L
HL
X
H
X
Column Address Entry
& Write
WRITE
H
HL
H
L
L
V
L
V
Column Address Entry
& Write with
WRITEA H
HL
H
L
L
V
HV
Auto-Precharge
Column Address Entry
& Read
READ
H
HL
H
L
HV
L
V
Column Address Entry
& Read with
READA
H
HL
H
L
HV
HV
Auto-Precharge
Auto-Refresh
REFA
H
HL
L
L
HX
X
X
Self-Refresh Entry
REFS
H
L
L
L
L
H
X
X
X
Self-Refresh Exit
Burst Terminate
L
HH
X
XX
X
X
X
REFSX
L
HL
H
HHX
X
X
TERM
H
H
L
H
H
L
X
X
X
1
Mode Register Set
MRS
H
HL
L
L
L
L
L
V2
H=High Level, L=Low Level, V=Valid, X=Don't Care, n=CLK cycle number
NOTE:
1. Applies only to read bursts while autoprecharge is disabled; this command is undefined (and should not be
used) during read bursts while autoprecharge is enabled, as well as during write bursts.
2. BA0-BA1 select either the Base or the Extended Mode Register (BA0 = 0, BA1 = 0 selects Mode
Register;BA0=1 ,BA1 = 0 selects Extended Mode Register; other combinations of BA0-BA1 are
reserved; A0-A12 provide the op-codes to be written to the selected Mode Register.
8
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