M2S56D20AKT Ver la hoja de datos (PDF) - Elpida Memory, Inc
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M2S56D20AKT 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 for CKE
Current State CKE n-1 CKE n /CS /RAS /CAS /WE Address
Action
Notes
SELF-
H
X
X
X
X
X
X INVALID
1
REFRESHING L
H
H
X
X
X
X Exit Self-Refresh (Idle after tRFC) 1
L
H
L
H
H
H
X Exit Self-Refresh (Idle after tRFC) 1
L
H
L
H
H
L
X ILLEGAL
1
L
H
L
H
L
X
X ILLEGAL
1
L
H
L
L
X
X
X ILLEGAL
1
L
L
X
X
X
X
X NOP (Maintain Self-Refresh)
1
POWER
H
X
X
X
X
X
X INVALID
DOWN
L
H
X
X
X
X
X Exit Power Down to Idle
L
L
X
X
X
X
X NOP (Maintain Power Down)
ALL BANKS H
H
X
X
X
X
X Refer to Function Truth Table
2
IDLE
H
L
L
L
L
H
X Enter Self-Refresh
2
H
L
H
X
X
X
X Enter Power Down
2
H
L
L
H
H
H
X Enter Power Down
2
H
L
L
H
H
L
X ILLEGAL
2
H
L
L
H
L
X
X ILLEGAL
2
H
L
L
L
X
X
X ILLEGAL
2
L
X
X
X
X
X
X
Refer to Current State =Power
Down
2
ANY STATE
H
other than
H
listed above
L
H
X
X
X
X
L
X
X
X
X
H
X
X
X
X
X Refer to Function Truth Table
X
Begin CLK Suspend at Next
Cycle
3
X Exit CLK Suspend at Next Cycle
3
L
L
X
X
X
X
X Maintain CLK Suspend
ABBREVIATIONS:
H=High Level, L=Low Level, X=Don't Care
NOTES:
1. Low to High transition of CKE re-enable CLK and other inputs asynchronously.
A minimum setup time must be satisfied before any command except REFSX.
2. Power-Down and Self-Refresh can be entered only from the All Banks Idle State.
3. Must be legal command.
13
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