M2S56D20AKT Просмотр технического описания (PDF) - Mitsumi
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M2S56D20AKT Datasheet PDF : 37 Pages
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DDR SDRAM (Rev.1.0)
Jul. '01 Preliminary
MITSUBISHI LSIs
M2S56D20/ 30/ 40AKT
256M Double Data Rate Synchronous DRAM
FUNCTION TRUTH TABLE for CKE
Current State CKE n-1 CKE n /CS
SELF-
H
REFRESHING
L
X
X
H
H
L
H
L
L
H
L
L
H
L
L
H
L
L
L
X
H
X
X
POWER
DOWN
L
H
X
L
L
X
H
ALL BANKS
IDLE
H
H
X
L
L
H
L
H
H
L
L
H
L
L
H
L
L
H
L
L
L
X
X
H
ANY STATE
other than listed
H
above
L
H
X
L
X
H
X
L
L
X
/RAS /CAS
X
X
X
X
H
H
H
H
H
L
L
X
X
X
X
X
X
X
X
X
X
X
L
L
X
X
H
H
H
H
H
L
L
X
X
X
X
X
X
X
X
X
X
X
/WE Address
Action
Notes
X
X INVALID
1
X
X Exit Self-Refresh (Idle after tRC)
1
H
X Exit Self-Refresh (Idle after tRC)
1
L
X ILLEGAL
1
X
X ILLEGAL
1
X
X ILLEGAL
1
X
X NOP (Maintain Self-Refresh)
1
X
X INVALID
X
X Exit Power Down to Idle
X
X NOP (Maintain Self-Refresh)
X
X Refer to Function Truth Table
2
H
X Enter Self-Refresh
2
X
X Enter Power Down
2
H
X Enter Power Down
2
L
X ILLEGAL
2
X
X ILLEGAL
2
X
X ILLEGAL
2
X
X Refer to Current State =Power Down
2
X
X Refer to Function Truth Table
X
X Begin CLK Suspend at Next Cycle
3
X
X Exit CLK Suspend at Next Cycle
3
X
X Maintain CLK Suspend
ABBREVIATIONS:
H=High Level, L=Low Level, X=Don't Care
NOTES:
1. CKE Low to High transition will re-enable CLK and other inputs asynchronously.
A minimum setup time must be satisfied before any command other than EXIT.
2. Power-Down and Self-Refresh can be entered only from the All Banks Idle State.
3. Must be legal command.
MITSUBISHI ELECTRIC
11
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