Philips CEM3000B Service Manual page 56

1 Semiconductor
Power Down Mode @CAS Latency=2, Burst Length=4
1 2 3
0
CLK
t
SI
∗Note 1
CKE
CS
RAS
CAS
ADDR
A11
A10
DQ
WE
UDQM,
LDQM
Power-down
Entry
*Note: 1. When both banks are in precharge state, and if CKE is set low, then the MSM56V16160F enters
power-down mode and maintains the mode while CKE is low.
2. To release the circuit from power-down mode, CKE has to be set high for longer than t
4 5 6 7 8
∗Note 2
t
t
PDE
SI
t (min.)
REF
Ra
Ra
Row
Active
Power-down Clock
Exit Suspension
Entry
9 10 11 12 13 14
t
SI
Ca
Qa0 Qa1 Qa2
Read Command
Clock
Suspension Exit
FEDD56V16160F-02
MSM56V16160F
15 16 17 18 19
Precharge Command
(t + 1CLK).
PDE SI
25/31