Philips CEM3000B Service Manual page 60

1 Semiconductor
FUNCTION TRUTH TABLE (Table 2) (2/2)
Current
CS RAS
1
State
L H
Write with
Auto
L L
Precharge
L L
Precharge H X
L H
L H
L H
L L
L L
L L
Write H X
Recovery
L H
L H
L H
L L
L L
L L
Row Active H X
L H
L H
L H
L L
L L
L L
Refresh H X
L H
L H
L L
L L
Mode H X
Register
L H
Access
L H
L H
L L
ABBREVIATIONS
RA = Row Address BA = Bank Address NOP = No OPeration command
CA = Column Address
∗Notes :1. All inputs are enabled when CKE is set high for at least 1 cycle prior to the inputs.
2. Illegal to bank in specified state, but may be legal in some cases depending on the state of bank
selection.
3. Satisfy the timing of l
4. NOP to bank precharging or in idle state. Precharges activated bank by BA or A10.
5. Illegal if any bank is not idle.
CAS WE
BA ADDR
L L X X
H X BA RA, A10
L X X X
X X X X
H H X X
H L BA X
L X BA CA
H H BA RA
H L BA A10
L X X X
X X X X
H H X X
H L BA X
L X BA CA
H H BA RA
H L BA A10
L X X X
X X X X
H H X X
H L BA X
L X BA CA
H H BA RA
H L BA A10
L X X X
X X X X
H X X X
L X X X
H X X X
L X X X
X X X X
H H X X
H L X X
L X X X
X X X X
AP = Auto Precharge
and t to prevent bus contention.
CCD WR
Action
ILLEGAL
ILLEGAL 2
ILLEGAL
NOP --> Idle after t RP
NOP --> Idle after t RP
ILLEGAL 2
ILLEGAL 2
ILLEGAL 2
NOP 4
ILLEGAL
NOP
NOP
ILLEGAL 2
ILLEGAL 2
ILLEGAL 2
ILLEGAL 2
ILLEGAL
NOP --> Row Active after t RCD
NOP --> Row Active after t RCD
ILLEGAL 2
ILLEGAL 2
ILLEGAL 2
ILLEGAL 2
ILLEGAL
NOP --> Idle after t RC
NOP --> Idle after t RC
ILLEGAL
ILLEGAL
ILLEGAL
NOP
NOP
ILLEGAL
ILLEGAL
ILLEGAL
FEDD56V16160F-02
MSM56V16160F
29/31