HYB39S164400 Datasheet, PDF (64/64 Pages) Siemens Semiconductor Group – 16 MBit Synchronous DRAM

CLOCK ENABLE (CKE) TRUTH TABLE:
HYB39S16400/800/160BT-8/-10
16MBit Synchronous DRAM
STATE(n)
CKE CKE CS RAS CAS WE Addr ACTION
n-1
n
Self-
Refresh⁶
H
X
X
X
X
X
X INVALID
L
H
H
X
X
X
X EXIT Self-Refresh, Idle after tRC
L
H
L
H
H
H
X EXIT Self-Refresh, Idle after tRC
L
H
L
H
H
L
X ILLEGAL
L
H
L
H
L
X
X ILLEGAL
L
H
L
L
X
X
X ILLEGAL
L
L
X
X
X
X
X NOP (Maintain Self-Refresh)
Power-Down H
X
X
X
X
X
X INVALID
L
H
H
X
X
X
X EXIT Power-Down, > Idle.
L
H
L
H
H
H
X EXIT Power-Down, > Idle.
L
H
L
H
H
L
X ILLEGAL
L
H
L
H
L
X
X ILLEGAL
L
H
L
L
X
X
X ILLEGAL
L
L
X
X
X
X
X NOP (Maintain Low-Power Mode)
All. Banks
H
H
X
X
X
X
X Refer to the function truth table
Idle⁷
H
L
H
X
X
X
X Enter Power- Down
H
L
L
H
H
H
X Enter Power- Down
H
L
L
H
H
L
X ILLEGAL
H
L
L
H
L
X
X ILLEGAL
H
L
L
L
H
X
X ILLEGAL
H
L
L
L
L
H
X Enter Self-Refresh
H
L
L
L
L
L
X ILLEGAL
L
L
X
X
X
X
X NOP
Any State
H
H
X
X
X
X
X Refer to the function truth table
other than
H
L
X
X
X
X
X Begin Clock Suspend next cycle⁸
listed above L
H
X
X
X
X
X Exit Clock Suspend next cycle⁸.
L
L
X
X
X
X
X Maintain Clock Suspend.
ABBREVIATIONS:
RA = Row Address
CA = Column Address
BS = Bank Address
AP = Auto Precharge
Notes for SDRAM function truth table :
1. Current State is state of the bank determined by BS. All entries assume that CKE was active
cycle.
(HIGH) during the precinegd clock
2. Illegal to bank in specified state; Function may be legal in the bank indicated by BS, depending on the state of that bank.
3. Must satisfy bus contention, bus turn around, and/or write recovery requirements.
4. NOP to bank precharging or in Idle state. May precharge bank(s) indicated by BS (andAP).
5. Illegal if any bank is not Idle.
6. CKE Low to High transition will re-enable CLK and other inputs asynchronously. A minimum setup time must be satisfied befoarney
command other than EXIT.
7. Power-Down and Self-Refresh can be entered only from the All Banks Idle State.
8. Must be legal command as defined in the SDRAM function truth table.
Semiconductor Group
64