MITSUBISHI LSIs
SDRAM (Rev. 0.3)
M5M4V4S40CTP-12, -15
Feb ‘97 Preliminary
4M (2-BANK x 131072-WORD x 16-BIT) Synchronous DRAM
FUNCTION TRUTH TABLE for CKE
CKE CKE
Current State
/CS /RAS /CAS /WE Add
Action
n-1
H
L
n
X
H
H
H
H
H
L
X
H
L
X
X
H
H
H
L
X
X
H
H
L
X
X
H
L
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
INVALID
SELF-
REFRESH*1
Exit Self-Refresh (Idle after tRC)
Exit Self-Refresh (Idle after tRC)
ILLEGAL
L
L
L
L
L
X
X
X
X
X
X
X
H
X
H
L
ILLEGAL
L
L
X
X
X
X
X
X
L
ILLEGAL
L
X
X
X
X
X
L
X
X
X
X
X
L
NOP (Maintain Self-Refresh)
INVALID
H
L
X
H
L
POWER
DOWN
Exit Power Down to Idle
NOP (Maintain Self-Refresh)
Refer to Function Truth Table
Enter Self-Refresh
L
H
H
H
H
H
H
H
L
H
L
ALL BANKS
IDLE*2
L
H
L
X
H
H
H
L
X
H
H
L
Enter Power Down
L
Enter Power Down
L
L
ILLEGAL
L
L
X
X
X
X
X
X
X
ILLEGAL
L
L
X
X
X
X
X
X
ILLEGAL
X
H
L
X
X
X
X
X
X
X
X
X
X
Refer to Current State =Power Down
Refer to Function Truth Table
Begin CLK Suspend at Next Cycle*3
Exit CLK Suspend at Next Cycle*3
Maintain CLK Suspend
H
H
L
ANY STATE
other than
listed above
H
L
L
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.
10
MITSUBISHI ELECTRIC
MITSUBISHI [ Mitsubishi Group ]
